JP6261992B2 - Focal plane shutter - Google Patents

Description

  The present invention relates to a focal plane shutter having a blade member that opens and closes an opening for exposure, and in particular, a focal that opens and closes an opening for exposure in a camera such as a single-lens camera, a single-lens reflex camera, a mirrorless camera, or a rangefinder camera. The present invention relates to a plain shutter.

  As a conventional focal plane shutter, a substantially rectangular substrate (base plate) having an opening for exposure, a partition plate (intermediate plate) and a back plate (back plate) arranged at a predetermined distance from the substrate, and an opening of the substrate A front curtain (blade member) movably disposed between the partition plate and the back plate to open and close the portion, a rear curtain (blade member) movably disposed between the substrate and the partition plate to open and close the opening of the substrate, A front curtain drive lever that drives the front curtain, a rear curtain drive lever that drives the rear curtain, and a blade (blade body) that abuts the blade when the rear curtain travels, and is arranged between the board and the partition plate to alleviate the impact. A rubber cushioning member, and a rubber cushioning member disposed between the substrate and the back plate so as to reduce impact by bringing the blade (blade body) into contact with each other when the front curtain is completed, In the shape of a substantially rectangular ring There is known (blade driving device) that is formed so that the blade body of the rear curtain and the front curtain is in contact with one linear outer side surface of the blade. For example, see Patent Document 1).

However, in this focal plane shutter, the substantially rectangular annular cushioning member is fixed by fitting the outer side surface of the three directions into the inner side surface of the concave portion (first holding portion) of the substrate. The blade body is formed so as to come into contact with the one outer surface released from the holding portion) from a substantially vertical direction.
Therefore, the shock absorbing member receives an impact at the portions where the meat is not thinned on both sides, and the straight portion where the blade body abuts on the inner side by the amount corresponding to the reduction of the spring constant by the thinned portion (the thinned portion is small). The shock-absorbing action is merely a reduction of the spring constant of the conventional fixed-type shock-absorbing member. Therefore, the blade body is always subjected to elastic deformation while being received on the same surface. Relative movement may occur, leading to local wear of the buffer member, a decrease in buffer performance, and generation of wear powder.

JP 2011-170226 A

  The present invention has been made in view of the above circumstances, and its purpose is to simplify the structure, improve durability, etc., and complete the travel of the blade member that opens and closes the opening. To provide a focal plane shutter capable of efficiently mitigating an impact, suppressing or preventing a bounce caused by the impact, preventing a shock member from being worn or damaged, and performing a shutter operation at a desired timing. is there.

The focal plane shutter according to the present invention includes a substrate having an opening for exposure, a blade member movably provided on the substrate to open and close the opening, a drive member for driving the blade member, and the end of travel of the blade member A focal plane shutter including a rubber cushioning member provided on the substrate to mitigate an impact at the time, wherein the cushioning member includes a fixed portion fixed to the substrate and a blade member or a driving member. A linear abutting portion that abuts, and a plurality of connecting portions that extend in a direction that forms a predetermined angle with respect to the moving direction when the blade member or the driving member abuts to connect the fixing portion and the abutting portion. The fixed portion, the contact portion, and the plurality of connecting portions are formed so as to define a plurality of lightening portions.
According to this configuration, when the blade member or the drive member comes into contact with the contact portion of the buffer member when the shutter operation of the blade member is completed (at the end of travel), the contact portion is elastically deformed and a plurality of connection portions are connected. The portion is elastically deformed so as to bend in the moving direction of the blade member or the drive member, and the impact at the end of travel of the blade member is alleviated.
In this impact mitigating action, the blade member or the drive member does not cause relative movement (slip) due to bending (elastic deformation) of the plurality of connecting portions after contacting the contact portion of the buffer member (both of them) Since the blades move together (without shifting the contact points), wear and breakage due to relative movement (sliding) can be prevented, and the travel of the blade member is completed while achieving simplified structure and improved durability. The impact at the time can be efficiently mitigated, and the bounce accompanying the impact can be suppressed or prevented, and the shutter operation can be performed at a desired timing.

The said structure WHEREIN: The structure which is formed so that several hollow parts may make a substantially parallelogram can be employ | adopted.
According to this configuration, since the plurality of lightening portions are formed so as to form a substantially parallelogram, the bending direction of the connecting portion is directed in advance, and therefore, the amount of elastic deformation due to the bending is sufficiently ensured. In addition, the desired shock absorbing performance can be obtained.

In the above-described configuration, a configuration in which the plurality of lightening portions are evenly arranged in the extending direction of the contact portion can be employed.
According to this configuration, since the plurality of lightening portions are uniformly formed in the extending direction of the contact portion, the entire area of the linear contact surface of the contact portion is in contact with the blade member or the drive member evenly (the contact It is possible to more reliably prevent one-side wear or the like due to local contact (contact).

In the above configuration, the blade member includes a blade main body that opens and closes the opening and a plurality of arms that connect the blade main body, and the buffer member is arranged to contact the blade main body or the arm. can do.
According to this configuration, since the blade body or the arm constituting the blade member is brought into contact with the linear contact portion of the buffer member, a stable impact mitigating action can be achieved while preventing deformation due to the collision of the blade member. Can be obtained.

In the above-described configuration, the substrate is a first blade chamber that cooperates with the ground plate, which is disposed between the ground plate and the back plate, the ground plate that rotatably supports the blade member, the back plate that is disposed at a predetermined interval from the ground plate, and the back plate. And an intermediate plate that cooperates with the back plate to define the second blade chamber, and the blade member is disposed at one of the first blade chamber and the second blade chamber to open the opening during the shutter operation. Including a rear blade disposed on the other of the first blade chamber and the second blade chamber to close the blade and the opening, and the buffer member includes a first buffer member disposed in the first blade chamber, and a second blade chamber The structure including the 2nd buffer member arrange | positioned in can be employ | adopted.
According to this configuration, the shutter operation is completed in the structure in which the first blade chamber between the base plate and the intermediate plate and the second blade chamber between the intermediate plate and the back plate are provided, and the leading blade and the rear blade move along the intermediate plate when deployed. Sometimes, the first buffer member disposed in the first blade chamber reduces the impact of one of the leading blade and the rear blade, and the second buffer member disposed in the second blade chamber impacts the other of the leading blade and the rear blade. To ease.
Thereby, the impact of the front blade and the rear blade is alleviated, and the shutter operation can be performed on the front blade and the rear blade at a desired timing.

In the above configuration, the substrate may employ a configuration that includes a fitting / clamping portion that fits and clamps the fixing portion of the buffer member.
According to this structure, a buffer member can be easily assembled | attached so that it may not fall out with respect to a ground plane by fitting the fixing | fixed part of a buffer member to the fitting clamping part of a ground plate.

In the above-described configuration, the fitting and clamping portion includes a first abutting wall portion that abuts on the outer surface of the fixing portion, a second abutting wall portion that abuts on the inner surface of the fixing portion between the plurality of connecting portions, and a fixed portion. A configuration including a third abutting wall portion that abuts on one side surface in the thickness direction of the portion can be employed.
According to this configuration, the outer surface of the fixed portion is brought into contact with the first contact wall portion, and the inner surface of the fixed portion is brought into contact with the second contact wall portion. By bringing one side surface of the fixed portion into contact with the wall portion, the first contact wall portion and the second contact wall portion sandwich the outer surface and inner surface of the fixed portion, and the third contact wall portion has a thickness. The positioning in the direction can be performed, and the buffer member can be easily assembled so as not to fall off the base plate.

In the above-described configuration, the fitting and clamping portion includes a first abutting wall portion that abuts on the outer surface of the fixing portion, a second abutting wall portion that abuts on the inner surface of the fixing portion between the plurality of connecting portions, and a fixed portion. A configuration including a third abutting wall portion that abuts on one side surface in the thickness direction of the portion and a fourth abutting wall portion that abuts on the other side surface in the thickness direction of the fixing portion can be employed.
According to this configuration, the outer surface of the fixed portion is brought into contact with the first contact wall portion, and the inner surface of the fixed portion is brought into contact with the second contact wall portion. One side surface of the fixed portion is brought into contact with the wall portion, and the other side surface of the fixed portion is brought into contact with the fourth contact wall portion. While fixing the side surface and the inner side surface, the fixed portion can be clamped and positioned in the thickness direction by the third contact wall portion and the fourth contact wall portion, and the buffer member can be more securely detached from the main plate. Can be assembled easily so that there is no.

The camera of the present invention includes a focal plane shutter having any one of the above-described configurations.
According to this configuration, while achieving simplification of the structure, improvement of durability, etc., it is possible to efficiently relieve the impact at the time of completion of travel of the blade member that opens and closes the opening, and it is also possible to suppress bounce and the like accompanying the impact. It is possible to prevent the buffer member from being worn or damaged, and the shutter operation can be performed at a desired timing.

  According to the focal plane shutter having the above-described configuration, the impact at the time of completion of travel of the blade member that opens and closes the opening can be efficiently mitigated while achieving simplification of the structure, improvement of durability, and the like. A focal plane shutter that can suppress or prevent bounce and the like, can prevent wear and damage of the buffer member, and can perform a shutter operation at a desired timing can be obtained.

FIG. 2 is a plan view showing a focal plane shutter according to an embodiment of the present invention and showing a state in which a blade member (a leading blade and a rear blade) has completed a shutter operation. It is a top view which shows the state which the blade | wing member (front blade | wing and rear blade | wing) contained in the focal plane shutter which concerns on this invention was set to the set position before shutter operation | movement. FIG. 6 is a plan view showing a state in which the leading blade travels from the set position and opens the opening in the blade member (leading blade and trailing blade) included in the focal plane shutter according to the present invention. It is a disassembled perspective view which shows the fitting clamping part of the board | substrate (ground plate) which fittingly clamps the 1st buffer member contained in the focal plane shutter which concerns on this invention, and the fixing | fixed part of a 1st buffer member. It is a fragmentary perspective view which shows the state which attached the 1st buffer member contained in the focal plane shutter which concerns on this invention to the fitting clamping part of the board | substrate (base plate). It is a fragmentary sectional view which shows the board | substrate (base plate, intermediate | middle board, back plate), the blade member (rear blade), and the 1st buffer member which are contained in the focal plane shutter which concerns on this invention. It is a schematic diagram explaining the operation | movement which the blade | wing member (blade main body of a rear blade | wing) contained in the focal plane shutter which concerns on this invention contact | abuts to a 1st buffer member. It is a schematic diagram explaining the effect | action of the 1st buffer member contained in the focal plane shutter which concerns on this invention, (a) is the state before the blade | wing main body of a rear blade contact | abuts to the 1st buffer member (contact part). (B) is a top view which shows the state which the blade | wing main body of the rear blade contact | abutted to the 1st buffer member (contact part), and was elastically deformed so that a some connection part might bend. It is a disassembled perspective view which shows the fitting clamping part of the board | substrate (base plate) which fittingly clamps the 2nd buffer member contained in the focal plane shutter which concerns on this invention, and the fixing | fixed part of a 2nd buffer member. It is a fragmentary sectional view which shows the board | substrate (base plate, intermediate | middle board, back plate), blade | wing member (front blade | wing), and 2nd buffer member which are contained in the focal plane shutter which concerns on this invention. It is a schematic diagram explaining the operation | movement which the blade | wing member (blade main body of a front blade | wing) contained in the focal plane shutter which concerns on this invention contact | abuts to a 2nd buffer member.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the focal plane shutter according to this embodiment includes a base plate 10 as a substrate having an opening 10a for exposure, and a back plate 20 as a substrate disposed in parallel with the base plate 10 at a predetermined interval. The intermediate plate 30 as a substrate disposed between the base plate 10 and the back plate 20, the front blade 40 and the rear blade 50 as the blade members provided movably with respect to the base plate 10, and the drive for driving the front blade 40 The leading blade driving lever 60 as a member, the trailing blade driving lever 70 as a driving member for driving the trailing blade 50, the driving pin 60a of the leading blade driving lever 60, and the driving pin 70a of the trailing blade driving lever 70 can abut each other. Two abutting rubbers 80, a first cushioning member 90 that abuts the blade body 54 of the trailing blade 50, a second cushioning member 100 that abuts the arm 45 of the leading blade 40, the leading blade 40 and A set member (not shown) for setting the rear blade 50 (that is, the front blade drive lever 60 and the rear blade drive lever 70) to the set position before the shutter operation (before the exposure operation), and a drive mechanism (not shown) for driving the set member ), Two electromagnets 110 for attracting and holding the leading blade driving lever 60 and the trailing blade driving lever 70 at the set position.

  As shown in FIGS. 1, 4 to 6, the base plate 10 is formed in a substantially rectangular flat plate shape, and is a long hole in which an opening 10 a for exposure having a substantially rectangular shape, an arc portion, and a semicircular portion are continuous. 10b, the long hole 10c, the supporting shafts 10d and 10e provided upright on the blade chamber side to support the leading blade 40, and the blade chamber side up to support the rear blade 50. The support shafts 10f and 10g, the support shaft 10h erected on the outside of the blade chamber to support the leading blade drive lever 60 so as to be rotatable, and the outside of the blade chamber to support the rear blade drive lever 70 so as to be rotatable. The support shaft 10i that is erected, and the fitting and holding portion that fixes the first buffer member 90 (the first contact wall portion 10j, the second contact wall portion 10k, the third contact wall portion 10m, and the fourth contact wall) Portion 10n), a fitting nipping portion for fixing the second buffer member 100 (first contact wall portion 10p, second contact wall) 10q, and a third contact wall 10r) or the like.

As shown in FIGS. 1 to 3, 6, and 10, the back plate 20 is disposed in parallel with the base plate 10 at a predetermined interval, is detachably fixed to the base plate 10, and has an opening corresponding to the opening 10 a. Part 20a and the like.
As shown in FIGS. 1 to 3, 6, and 10, the intermediate plate 30 is disposed between the base plate 10 and the back plate 20, and defines the first blade chamber W <b> 1 in cooperation with the base plate 10. The second blade chamber W2 is defined in cooperation with the plate 20, and includes an opening 30a corresponding to the opening 10a.
The rear blade 50 is disposed in the first blade chamber W1 defined between the base plate 10 and the intermediate plate 30, and the front blade 40 is disposed in the second blade chamber W2 defined between the intermediate plate 30 and the back plate 20. Arranged, the intermediate plate 30 guides the leading blade 40 and the trailing blade 50 so as to be developed along both sides thereof.

As shown in FIGS. 1 to 3, the leading blade 40 includes four blade bodies 41, 42, 43, 44 and two arms 45, 46 that connect the blade bodies 41, 42, 43, 44. Yes.
The arm 45 is rotatably supported by the support shaft 10 d and a part of the arm 45 is connected to the drive pin 60 a of the leading blade drive lever 60.
The arm 46 is rotatably supported by the support shaft 10e.
Then, as shown in FIG. 1, the arm 45 is driven downward (clockwise) in the figure by the leading blade driving lever 60, so that the four blade bodies 41, 42, 43, and 44 overlap each other. The opening 45a is opened and the arm 45 abuts against the second buffer member 100 (the abutting portion 102 thereof). On the other hand, as shown in FIG. When driven (clockwise), the four blade bodies 41, 42, 43, and 44 are deployed to close the opening 10a.

As shown in FIGS. 1 to 3 and 6, the rear blade 50 is composed of four blade bodies 51, 52, 53, 54 and two arms 55, 56 that connect the blade bodies 51, 52, 53, 54. It is configured.
The arm 55 is rotatably supported by the support shaft 10 f and a part thereof is connected to the drive pin 70 a of the rear blade drive lever 70.
The arm 56 is rotatably supported by the support shaft 10g.
Then, as shown in FIG. 1, the arm 55 is driven downward (clockwise) by the rear blade drive lever 70 as shown in FIG. 1, so that the four blade bodies 51, 52, 53, 54 are developed. Then, the opening 10a is closed and the blade main body 54 is in contact with the first buffer member 90 (the contact portion 92 thereof). On the other hand, as shown in FIG. When driven (counterclockwise), the four blade bodies 51, 52, 53, and 54 are overlapped to open the opening 10a.

As shown in FIGS. 1 to 3, the leading blade drive lever 60 is engaged with a drive pin 60a to which the arm 45 is connected, and a set member is engaged when set at the set position before the shutter operation (before the exposure operation). An engaging portion 60b to which a rotational force is exerted counterclockwise, an attracted portion 60c to be attracted by the electromagnet 110, and the like are provided.
The leading blade driving lever 60 is rotatably supported by the support shaft 10h and is urged to rotate clockwise by an urging spring (not shown), and the driving pin 60a is inserted into the long hole 10b and the leading blade. 40 is connected to the arm 45 and rotated in the clockwise direction by the biasing spring in the resting state to move the leading blade 40 to the open position and the drive pin 60a contacts the contact rubber 80, while the set member Is rotated counterclockwise to move the leading blade 40 to the closed position, and the attracted portion 60c is attracted by the energization of the electromagnet 110 during the exposure operation by a signal such as a release, and is held at the set position before the shutter operation. By de-energizing the electromagnet 110, the attraction by the magnetic force is released, and the leading blade 40 is moved to the open position by being rotated clockwise by the biasing force of the biasing spring. It has become way.

As shown in FIGS. 1 to 3, the rear blade drive lever 70 is engaged with the drive pin 70a to which the arm 55 is connected, and the set member is engaged when set to the set position before the shutter operation (before the exposure operation). An engaging portion 70b to which a rotational force is exerted counterclockwise, an attracted portion 70c to be attracted by the electromagnet 110, and the like are provided.
The rear blade drive lever 70 is rotatably supported by the support shaft 10i and is rotated and urged clockwise by an urging spring (not shown), and the drive pin 70a is inserted into the long hole 10c and the rear blade. 50 is connected to the arm 55 and rotated in the clockwise direction by the biasing spring in the resting state to move the rear blade 50 to the closed position and the drive pin 70a contacts the contact rubber 80, while the set member Is rotated counterclockwise to move the rear blade 50 to the open position, and the attracted portion 70c is attracted by energization of the electromagnet 110 during the dew operation by a signal such as a release, and is held at the set position before the shutter operation. By de-energizing the electromagnet 110, the adsorption by the magnetic force is released, and the rear blade 50 is moved to the closed position by being rotated clockwise by the urging force of the urging spring. It has become way.

  The contact rubbers 80, 80 are formed of an elastically deformable rubber material or the like, and are fitted into and fixed to the semicircular portions of the long holes 10b, 10c of the base plate 10, as shown in FIGS. When the shutter operation is completed, the drive pins 60a and 70a are brought into contact with each other so as to reduce the impact.

  As shown in FIGS. 1 to 3 and FIGS. 4 to 8, the first buffer member 90 is disposed in the first blade chamber W <b> 1 and is elastically deformable to contact the blade body 54 of the rear blade 50. It is formed of a material or the like, and does not move to the fitting sandwiching portion (first contact wall portion 10j, second contact wall portion 10k, third contact wall portion 10m, fourth contact wall portion 10n) of the base plate 10. The fixed portion 91 fixed to the blade, the contact portion 92 having a linear contact surface 92a for contacting the blade main body 54, the fixed portion 91 and the contact portion 92 are coupled (as shown in FIGS. 7 and 8). A) a plurality of (here, six) connecting portions 93 formed so as to be oriented at a predetermined angle θ with respect to the moving direction V when the blade body 54 is in contact.

As shown in FIGS. 4 to 6, the fixing portion 91 is formed in a substantially rectangular parallelepiped shape, and includes an outer surface 91 a that contacts the first contact wall portion 10 j of the base plate 10, and a second contact wall portion of the base plate 10. An inner side surface 91b in contact with 10k, a side surface 91c in contact with the third contact wall portion 10m of the base plate 10, a concave portion 91d as another side surface in contact with the fourth contact wall portion 10n of the base plate 10, etc. Is formed.
As shown in FIGS. 4 to 6, the contact portion 92 is formed in a substantially rectangular parallelepiped shape with the same thickness as the fixed portion 91, and the blade body 54 (the linear edge portion) of the rear blade 50 is formed. It is formed so as to demarcate a linear flat contact surface 92a and the like that come into contact with each other in a detachable manner.
As shown in FIGS. 4 to 6, the plurality of connecting portions 93 are formed in a substantially rectangular parallelepiped shape with the same thickness as the fixing portion 91 and the contact portion 92 (as shown in FIGS. 7 and 8). ) It is formed so as to extend in a direction L that forms an angle θ with respect to the moving direction V when the blade body 54 abuts, and to connect the fixing portion 91 and the abutment portion 92.
That is, the first buffer member 90 defines a plurality of (in this case, five) lightening portions S by the fixing portion 91, the abutting portion 92, and the plurality of connecting portions 93. 8 (a) and 8 (b), they are substantially parallelograms, and are formed so as to be evenly arranged in the extending direction of the abutment portion 92.

As shown in FIGS. 4 to 6, the first buffer member 90 has an outer surface 91a in contact with the first contact wall 10j and an inner surface 91b in contact with the second contact wall 10k. The one side 91c is brought into contact with the third abutting wall 10m, and the concave portion 91d is brought into contact with the fourth abutting wall 10n, so that the fixed portion 91 is fitted into the fitting sandwiching portion of the base plate 10. Thus, the abutting portion 92 and the plurality of connecting portions 93 are maintained in a non-contact state with respect to the base plate 10 and can be elastically deformed freely.
In addition, when fixing the 1st buffer member 90 to the fitting clamping part of the ground plane 10, it is engage | inserted so that the both sides | surfaces of the connection part 93 may become non-contact with the side surface of the 2nd contact wall part 10k, The bending deformation of the connecting portion 93 is not hindered.
As described above, the first buffer member 90 includes the third contact wall portion 10m while holding the outer side surface 91a and the inner side surface 91b of the fixed portion 91 between the first contact wall portion 10j and the second contact wall portion 10k. Further, the fixing portion 91 can be sandwiched and positioned in the thickness direction by the fourth abutting wall portion 10n, and can be easily assembled so as not to fall off the base plate 10.

Here, the buffering action of the first buffer member 90 will be described with reference to FIGS.
First, as shown in FIG. 8A, the blade body 54 (the linear edge portion) of the rear blade 50 and the contact portion 92 (the contact surface 92a thereof) of the first buffer member 90 are substantially parallel to each other. In this state, the blade body 50 approaches the first buffer member 90.
When the blade body 54 contacts the contact portion 92 of the first buffer member 90, the connecting portion 93 of the first buffer member 90 is in a direction L that forms an angle θ with respect to the moving direction V of the blade body 54. Oriented to stretch.
Subsequently, when the blade main body 54 exerts a pressing action in the moving direction V while being in contact with the contact surface 92a of the contact portion 92, as shown in FIG. 8B, the contact portion 92 is brought into contact with the contact surface 92a. The blade body 54 is elastically deformed in response to the blade body 54 in the entire area of the blade, and the plurality of connecting portions 93 are elastically deformed so as to bend in the moving direction V, so that the impact at the end of the travel of the rear blade 50 is relieved, and then elastically returns. Return to the original state.
In this impact mitigating action, the blade main body 54 causes relative movement (slip) due to bending (elastic deformation) of the plurality of connecting portions 93 after contacting the contact portion 92 of the first buffer member 90. (The point P1 on the blade main body 54 and the point P2 on the contact portion 92 move together as shown in FIG. 8B), and wear due to relative movement (slip). Can prevent the damage at the time of completion of running of the rear blade 50 while also achieving simplification of the structure, improvement of durability, etc., and can also suppress or prevent the bounce accompanying the impact, The shutter operation can be performed at a desired timing.

Here, since the plurality of lightening portions S are formed so as to form a substantially parallelogram, the bending direction of the connecting portion 93 is directed in advance, and therefore, a sufficient amount of elastic deformation due to the bending can be ensured. At the same time, the desired shock absorbing performance can be obtained.
Further, since the plurality of lightening portions S are evenly arranged in the extending direction of the contact portion 92, the entire area of the linear contact surface 92 a of the contact portion 92 contacts the blade body 54 evenly (contacts). Thus, it is possible to reliably prevent one-side wear and the like due to local contact (contact).
Furthermore, since the abutting portion 92 of the first buffer member 90 abuts linearly with the blade body 54, a stable impact mitigating action can be obtained while preventing deformation due to the collision of the rear blade 50.

  As shown in FIGS. 1 to 3 and FIGS. 9 to 11, the second buffer member 100 is disposed in the second blade chamber W <b> 2 and is elastically deformable so as to abut the arm 45 of the leading blade 40. Etc., and a fixed portion 101 and an arm that are fixedly fixed to the fitting sandwiching portions (first contact wall portion 10p, second contact wall portion 10q, third contact wall portion 10r) of the base plate 10 The abutment portion 102 having a linear abutment surface 102a for abutting the abutment 45, the fixed portion 101, and the abutment portion 102 are coupled (as shown in FIG. 11) in the moving direction V when the arm 45 abuts. On the other hand, a plurality of (here, four) connecting portions 103 formed to be oriented at a predetermined angle θ are provided.

As shown in FIGS. 9 to 11, the fixing portion 101 is formed in a substantially rectangular parallelepiped shape, and has an outer surface 101 a that comes into contact with the first contact wall portion 10 p of the base plate 10, and a second contact wall portion of the base plate 10. It is formed so as to demarcate an inner side surface 101b that comes into contact with 10q, a side surface 101c that comes into contact with the third contact wall portion 10r of the main plate 10, and the like.
As shown in FIGS. 9 to 11, the contact portion 102 is formed in a substantially rectangular parallelepiped shape with the same thickness as the fixed portion 101, and the arm 45 (the linear edge portion) of the leading blade 40 is detached. It is formed so as to demarcate a linear flat contact surface 102a and the like that come into contact with each other.
As shown in FIGS. 9 to 11, the plurality of connecting portions 103 are formed in a substantially rectangular parallelepiped shape with the same thickness as the fixed portion 101 and the contact portion 102, and as shown in FIG. Is formed so as to extend in a direction L that forms an angle θ with respect to the moving direction V at the time of contact, and to connect the fixed portion 101 and the contact portion 102.
That is, the second buffer member 100 defines a plurality (three in this case) of the lightening portions S by the fixing portion 101, the contact portion 102, and the plurality of connecting portions 103. As shown in FIG. 11, it forms a substantially parallelogram and is formed so as to be evenly arranged in the extending direction of the contact portion 102.

As shown in FIGS. 9 to 11, the second buffer member 100 has the outer surface 101a in contact with the first contact wall portion 10p and the inner surface 101b in contact with the second contact wall portion 10q. The one side surface 101c is brought into contact with the third contact wall portion 10r, so that the fixing portion 101 is fitted and fixed to the fitting and holding portion of the base plate 10, and the contact portion 102 and the plurality of connecting portions are fixed. 103 is maintained in a non-contact state with respect to the main plate 10 and can be elastically deformed freely.
In addition, when fixing the 2nd buffer member 100 to the fitting clamping part of the ground plane 10, it is engage | inserted so that the both sides | surfaces of the connection part 103 may become non-contact with the side surface of the 2nd contact wall part 10q, The bending deformation of the connecting portion 103 is not hindered.
As described above, the second buffer member 100 includes the third contact wall portion 10r while holding the outer surface 101a and the inner surface 101b of the fixed portion 101 between the first contact wall portion 10p and the second contact wall portion 10q. Thus, the fixing portion 101 can be positioned in the thickness direction, and can be easily assembled so as not to fall off the base plate 10.

Also in the second buffer member 100 having the above-described configuration, the same impact mitigating action as that of the first buffer member 90 is obtained, and the arm 45 is connected to the contact portion 102 of the second buffer member 100 and then connected to the plurality of connection members. Due to the bending (elastic deformation) of the portion 103, it moves integrally without causing any relative movement (slip) (without shifting the contact point between the two), and therefore wear or breakage due to relative movement (slip). The impact at the completion of the travel of the leading blade 40 can be efficiently mitigated while the simplification of the structure and the improvement of the durability can be achieved, and the bounce associated with the impact can be suppressed or prevented, and the desired timing can be achieved. With this, the shutter operation can be performed.
Here, similarly to the first buffer member 90, since the plurality of lightening portions S are formed so as to form a substantially parallelogram, the bending direction of the connecting portion 103 is directed in advance, and therefore, A sufficient amount of elastic deformation due to bending can be secured, and a desired shock absorbing performance can be obtained.
Further, since the plurality of lightening portions S are evenly arranged in the extending direction of the contact portion 102, the entire area of the linear contact surface 102 a of the contact portion 102 is evenly contacted (contacted) with the arm 45. Thus, it is possible to reliably prevent one-side wear or the like due to local contact (contact).
Furthermore, since the abutting portion 102 of the second buffer member 100 abuts linearly with the arm 45, a stable impact mitigating action can be obtained while preventing deformation or the like due to the collision of the leading blade 40.

The two electromagnets 110 are held by a support plate (not shown) arranged in parallel to the ground plane 10, and as shown in FIGS. 1 to 3, an iron core member 111 and an iron core member 111 having a predetermined length. And an exciting coil 112 wound around a bobbin.
And the magnetic force line which passes along the iron core member 111 is generated by energizing the coil 112, and the attracted portion 60c of the leading blade driving lever 60 and the trailing blade driving lever 70 set at the set position as shown in FIG. 70c, the iron core member 111 faces and exerts a magnetic attractive force to hold the leading blade driving lever 60 and the trailing blade driving lever 70 in the set position against the rotational biasing force of each biasing spring, On the other hand, by cutting off the power to the coil 112, the leading blade driving lever 60 and the trailing blade driving lever 70 are allowed to rotate clockwise by the rotational biasing force of the biasing spring.

Next, the operation of the focal plane shutter will be described with reference to FIGS.
First, in a rest state after completion of the shutter operation (after completion of the exposure operation), as shown in FIG. 1, the leading blade drive lever 60 rotates clockwise and the drive pin 60a contacts the contact rubber 80. At the same time, the arm 45 of the leading blade 40 abuts against the second buffer member 100 and stops, the leading blade 40 is located at a position where the opening 10a is opened, and the trailing blade driving lever 70 rotates clockwise. Then, the drive pin 70a comes into contact with the contact rubber 80 and stops, and the blade body 54 of the rear blade 50 comes into contact with the first buffer member 90 and stops. The rear blade 50 is located at a position where the opening 10a is closed. doing.

  Here, when a shutter operation preparation command is issued by a release operation or the like, the setting operation is performed by the setting member, and as shown in FIG. 2, the leading blade drive lever 60 is rotated counterclockwise to perform the shutter operation. It is positioned at the previous set position (the state where the leading blade 40 closes the opening 10a), and the trailing blade driving lever 70 is rotated counterclockwise to set the position before the shutter operation (the trailing blade 50 opens the opening 10a). When the electromagnets 110 and 110 are energized, the attracted portions 60c and 70c are attracted and the leading blade driving lever 60 and the trailing blade driving lever 70 are urged to rotate clockwise. Hold the set spring against the biasing force of the spring. Then, the set member is returned to the rest position, and the state of restricting the clockwise rotation of the leading blade driving lever 60 and the trailing blade driving lever 70 is released.

Subsequently, when the electromagnet 110 is de-energized at a desired timing, as shown in FIG. 3, the leading blade drive lever 60 is rotated clockwise by the biasing force of the biasing spring, and the leading blade 40 is opened. 10a is opened, the drive pin 60a contacts the contact rubber 80, and the arm 45 of the front blade 40 contacts the second buffer member 100, so that the impact is alleviated, and the front blade 40 and the front blade drive lever 60 are released. Stops at a predetermined position.
In particular, when the shutter operation of the leading blade 40 is completed (at the end of travel), when the arm 45 of the leading blade 40 abuts against the abutting portion 102 of the second buffer member 100, the abutting portion 102 is elastically deformed and plural The connecting portion 103 is elastically deformed so as to bend in the moving direction V of the leading blade 40 (the arm 45 thereof), and the impact at the end of the traveling of the leading blade 40 is alleviated.
In this impact mitigating action, the arm 45 of the leading blade 40 abuts against the abutting portion 102 of the second buffer member 100, and then undergoes relative movement (sliding) due to bending (elastic deformation) of the plurality of connecting portions 103. Since it moves as a unit without any occurrence, it prevents wear and breakage due to relative movement (slip), effectively reduces the impact at the time of travel completion, and suppresses or prevents bounce caused by the impact. .

Subsequently, when the electromagnet 110 is deenergized at a desired timing, as shown in FIG. 1, the rear blade drive lever 70 is rotated clockwise by the biasing force of the biasing spring, and the rear blade 50 is opened. 10a is closed, the drive pin 70a comes into contact with the contact rubber 80, and the blade body 54 of the rear blade 50 comes into contact with the first buffer member 90, so that the impact is alleviated, and the rear blade 50 and the rear blade drive lever 70 stops at a predetermined position.
In particular, when the shutter main body 54 of the rear blade 50 comes into contact with the contact portion 92 of the first buffer member 90 when the shutter operation of the rear blade 50 is completed (at the end of travel), the contact portion 92 is elastically deformed. The plurality of connecting portions 93 are elastically deformed so as to bend in the moving direction V of the rear blade 50 (the blade body 54), and the impact at the end of the travel of the rear blade 50 is alleviated.
In this impact mitigating action, the blade main body 54 of the rear blade 50 abuts against the abutting portion 92 of the first buffer member 90, and is then relatively moved (slided) by bending (elastic deformation) of the plurality of connecting portions 93. Since it moves as a unit without causing friction, it prevents wear and breakage due to relative movement (sliding), effectively mitigates the impact at the time of travel completion, and suppresses or prevents bounce caused by the impact. The
As described above, the opening / closing operation of the opening 10a by the leading blade 40 and the trailing blade 50 is performed, and one shutter operation is completed.

  Thus, the buffer member (the first buffer member 90, the second buffer member 100) is a straight line that abuts the fixing portions 91, 101 fixed to the substrate 10 and the blade member (the blade body 54, the arm 45). The abutting portions 92 and 102, the fixing members 91 and 101, and the abutting portions that extend in a direction L that forms a predetermined angle θ with respect to the moving direction V when the vane members (the vane body 54 and the arm 45) abut. It includes a plurality of connecting portions 93 and 103 for connecting 92 and 102, and is formed so as to define a plurality of lightening portions S by the fixing portions 91 and 101, the contact portions 92 and 102, and the plurality of connecting portions 93 and 103. Therefore, after the blade member (rear blade 50, leading blade 40) contacts the contact portions 92, 102, relative movement (sliding) is caused by bending (elastic deformation) of the plurality of connection portions 93, 103. To move together without causing It is possible to prevent wear and breakage due to relative movement (sliding), simplify the structure, improve durability, etc., while impacting the blade member (the leading blade 40, the trailing blade 50) at the completion of traveling. It is possible to relax efficiently and to suppress or prevent a bounce caused by an impact, and to perform a shutter operation at a desired timing.

In the above embodiment, in the configuration including the leading blade 40 and the trailing blade 50, the second cushioning member 100 that contacts the arm 45 of the leading blade 40 and the first cushioning member 90 that contacts the blade body 54 of the trailing blade 50 are provided. However, the present invention is not limited to this. For example, in a configuration in which one blade member is provided and the shutter operation is performed by simply moving the opening from the open state to the closed state, the blade One shock-absorbing member that abuts on the member (the arm or blade body) may be employed.
In the said embodiment, although the buffer member (the 1st buffer member 90, the 2nd buffer member 100) showed the case where it contact | abuts to the blade | wing main body 54 and the arm 45 which comprise a blade member, it is not limited to this. Instead, it may be configured to abut against a driving member (rear blade driving lever 70, leading blade driving lever 60) for driving the blade member.

In the said embodiment, although the buffer member (the 1st buffer member 90, the 2nd buffer member 100) in which the some hollow part S made | formed a substantially parallelogram was shown as a buffer member, it is not limited to this. Alternatively, a cushioning member formed so as to define a hollow portion having another form may be employed.
In the above embodiment, the base plate 10, the back plate 20, and the intermediate plate 30 are provided as substrates, the leading blade 40 is disposed in the second blade chamber W2 defined by the intermediate plate 30 and the back plate 20, and the rear blade 50 is provided. Although the structure arrange | positioned in the 1st blade chamber W1 demarcated by the baseplate 10 and the intermediate plate 30 was shown, the front blade 40 is arrange | positioned in the 1st blade chamber W1, and the buffer member is arrange | positioned in the position corresponding to it, A configuration in which the rear blade 50 is disposed in the second blade chamber W2 and the buffer member is disposed in a position corresponding to the rear blade 50 may be employed.

  As described above, the focal plane shutter of the present invention can efficiently reduce the impact at the time of completion of travel of the blade member that opens and closes the opening while achieving simplification of the structure, improvement of durability, etc. Bounces caused by impacts can be suppressed or prevented, wear and breakage of buffer members can be prevented, and shutter operations can be performed at the desired timing, so single-lens cameras, single-lens reflex cameras, mirrorless cameras, rangefinder cameras, etc. Of course, the present invention can be applied to other optical apparatuses having an opening for exposure.

10 Ground plane (substrate)
10a opening 10j, 10p 1st contact wall part (fitting clamping part)
10k, 10q 2nd contact wall part (fitting clamping part)
10m, 10r 3rd contact wall part (fitting clamping part)
10n 4th contact wall part (fitting clamping part)
20 Back plate (substrate)
30 Intermediate plate (substrate)
W1 First blade chamber W2 Second blade chamber 40 Lead blade (blade member)
41, 42, 43, 44 Blade body 45, 46 Arm 50 Rear blade (blade member)
51, 52, 53, 54 Blade body 55, 56 Arm 60 Lead blade drive lever (drive member)
70 Rear blade drive lever (drive member)
90 First buffer member 91 Fixed portion 91a Outer side surface 91b Inner side surface 91c One side surface 91d Concave portion (other side surface)
92 abutting portion 92a abutting surface 93 plural connecting portions 100 second buffer member 101 fixing portion 101a outer side surface 101b inner side surface 101c one side surface 102 abutting portion 102a abutting surface 103 plural connecting portions S lightening portion

Claims (8)

A substrate having an opening for exposure;
A blade member movably provided on the substrate to open and close the opening;
A drive member for driving the blade member;
A focal plane shutter including an elastically deformable buffer member provided on the substrate to reduce an impact at the end of travel of the blade member,
The buffer member is
A fixed portion fixed to the substrate immovably,
A linear contact portion for contacting the blade member or the drive member;
Including a plurality of connecting portions that extend in a direction that forms a predetermined angle with respect to a moving direction when the blade member or the driving member contacts, and connect the fixing portion and the contact portion;
The fixing portion, the abutting portion, and the plurality of connecting portions are formed so as to define a plurality of lightening portions each forming a substantially parallelogram.
A focal plane shutter characterized by that. The plurality of lightening portions are evenly arranged in the extending direction of the contact portion,
The focal plane shutter according to claim 1. The blade member includes a blade body that opens and closes the opening, and a plurality of arms that connect the blade body,
The buffer member is disposed so as to contact the blade body or the arm,
The focal plane shutter according to claim 1 or 2, The substrate includes a ground plate that rotatably supports the blade member, a back plate that is disposed at a predetermined interval from the ground plate, and a first plate that is disposed between the ground plate and the back plate in cooperation with the ground plate. Including an intermediate plate defining a second blade chamber in cooperation with the blade chamber and the back plate;
The blade member includes a front blade disposed in one of the first blade chamber and the second blade chamber to open the opening and a first blade chamber and a second blade to close the opening during shutter operation. Including a rear blade disposed on the other side of the blade chamber;
The buffer member includes a first buffer member disposed in the first blade chamber and a second buffer member disposed in the second blade chamber.
The focal plane shutter according to any one of claims 1 to 3. The substrate includes a fitting pinching part that fits and holds the fixing part of the buffer member.
The focal plane shutter according to claim 1, wherein the focal plane shutter is a shutter. The fitting sandwiching portion includes a first abutting wall portion that abuts on an outer surface of the fixing portion, a second abutting wall portion that abuts on an inner surface of the fixing portion between the plurality of connecting portions, Including a third abutting wall portion that abuts on one side surface in the thickness direction of the fixed portion;
The focal plane shutter according to claim 5. The fitting sandwiching portion includes a first abutting wall portion that abuts on an outer surface of the fixing portion, a second abutting wall portion that abuts on an inner surface of the fixing portion between the plurality of connecting portions, A third abutting wall portion that abuts on one side surface in the thickness direction of the fixed portion; and a fourth abutting wall portion that abuts on the other side surface in the thickness direction of the fixed portion.
The focal plane shutter according to claim 5. The focal plane shutter according to claim 1 is provided.
A camera characterized by that.

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