JP6081892B2 - Focal plane shutter and optical instrument - 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 relates to a focal plane shutter that opens and closes an opening for exposure in a camera such as a digital camera.

  Conventional focal plane shutters include a substantially rectangular base plate having an opening for exposure, a leading blade and a trailing blade (blade member) that are movably formed to open and close the opening of the ground plate, and a tip for driving the leading blade. Blade driving member, rear blade driving member for driving the rear blade, leading blade driving member and iron blade member provided on the rear blade driving member, leading blade driving member (and leading blade) and trailing blade driving member ( And a set member before the shutter operation (before the exposure operation), a return spring for returning the set member to the rest position before the set operation, and a driving force for the set operation connected to the set member. Drive mechanism (link member, transmission member, gear train, motor, etc.), two electromagnets that can attract the iron piece member to hold the leading blade driving member and the trailing blade driving member in the set position The front blade driving member (and the front blade) and the rear blade driving member (and the rear blade) are attracted to the iron piece member by the magnetic attraction force of the electromagnet immediately before the start of photographing immediately after the release (before the shutter operation). ) Is sucked and held at the set position, the set member is returned to the rest position by the biasing force of the return spring to release the set operation, and then the holding state by the electromagnet is released in order to drive the leading blade drive member (and the leading blade). In addition, there is known one in which a shutter operation (exposure operation) is performed by running a rear blade drive member (and a rear blade) (see, for example, Patent Document 1).

  In this focal plane shutter, when the set member is returned to the rest position by the urging force of the return spring after the set operation by the drive mechanism, the recoil (bound) that moves in the reverse direction after the set member abuts against the stopper is generated. Until the reaction of the set member is converged (bound), the blade member (front blade and rear blade) cannot be moved and the shutter operation cannot be performed. Therefore, the time lag from the release operation to the completion of photographing is reduced. It cannot be shortened, and the continuous shooting speed during continuous shooting cannot be increased, which is a factor that hinders shortening of a series of control sequences.

JP 2003-107559 A

  The present invention has been made in view of the above circumstances, and the object of the present invention is to complete the photographing from the release operation by preventing the recoil of the set member while simplifying the structure and reducing the size. It is an object of the present invention to provide a focal plane shutter for a camera capable of shortening the time lag until the time of continuous shooting, increasing the speed of continuous shooting, and shortening a series of control sequences.

The focal plane shutter of the present invention includes a ground plate having an opening for exposure, a blade member movably provided on the ground plate to open and close the opening, and a drive biased in one direction to drive the blade member. A member, a set member that can set the drive member against the biasing force at the set position before the shutter operation, and is biased to return to the rest position after the drive member is attracted and held by the electromagnet to the set position; and And a driving mechanism that causes the member to perform a set operation, and a restriction mechanism that restricts the set member from moving in the reverse direction when the set member returns to a rest position by an urging force. It is characterized by providing.
According to this configuration, when the set member is driven by the drive mechanism to perform the set operation and the drive member (and the blade member) is set at the set position before the shutter operation, the drive member is held at the set position by the electromagnet. After that, the set member is returned to the rest position by an urging force (such as a return spring), the mechanical restriction of the drive member is released, and the blade member is allowed to travel (by turning off the energization of the electromagnet). .
Here, when the set member returns to the rest position by the urging force (when it comes into contact with the stopper or the like at the rest position), the reaction mechanism (bound) in which the set member moves in the reverse direction is restricted by the restriction mechanism. The shutter operation can be completed by moving the blade member immediately after the set member returns to the rest position.
Thereby, the time lag from the release operation to the completion of photographing can be shortened, the continuous shooting speed at the time of continuous shooting can be increased, and a series of control sequences can be shortened.

In the above configuration, the drive mechanism includes a link member connected to the set member, and the restriction mechanism is configured to restrict the movement of the link member to restrict the set member from moving in the opposite direction. A configuration can be employed.
According to this configuration, the regulating mechanism regulates the recoil of the set member by regulating the movement of the link member that forms part of the drive mechanism connected to the set member, that is, the existing mechanism that forms part of the drive mechanism. In order to regulate the movement of the link member, it is possible to provide a regulating mechanism while achieving simplification and downsizing of the structure without adding new parts around the set member.

In the above configuration, the drive mechanism further includes a swinging member connected to the link member, a first cam member that rotates to exert a cam action on the swinging member, and the restricting mechanism includes the first cam member. A second cam member that rotates coaxially and a locking member that is positioned at a position where the movement of the link member can be restricted by the cam action of the second cam member when the set member returns to the rest position. The configuration can be adopted.
According to this configuration, for example, when the first cam member rotates in one direction (for example, by a motor as a drive source), the swing member moves in one direction and the link member moves in one direction, When the set member performs the set operation, the drive member (and the blade member) is set to the set position, and when the first cam member further rotates to release the cam action, the set member is stopped by the biasing force (such as a return spring). When the second cam member rotates in one direction and the cam action is released by returning to the position, the locking member can move in one direction (by the urging force of the urging spring) to restrict the movement of the link member. Positioned in position.
Thus, since the first cam member and the second cam member are formed so as to rotate integrally coaxially, both the cam members can be rotated by the driving force of one driving source, and The relative timing at which each cam member exerts a cam action can be set with high accuracy.

In the above configuration, the locking member is positioned at a contact position that allows movement of the link member while contacting a part of the link member when the set member completes the set operation to the set position, and the set member is in the rest position. It is possible to adopt a configuration that is formed so as to be positioned at a restricting position where the movement of the link member can be restricted while facing a part of the link member when returning to FIG.
According to this configuration, since the locking member is held at the contact position that contacts a part of the link member when the setting operation is completed, the locking member immediately moves from the contact position to the restriction position when the setting member returns to the rest position. Thus, the movement of the link member can be restricted, and the restriction operation can be performed with a quick movement.

In the above configuration, the link member is formed to move in a first surface parallel to the surface on which the set member moves, and the locking member is formed to move in a second surface perpendicular to the first surface. In addition, at the contact position, it is possible to adopt a configuration in which the contact member is biased so as to come into contact with a part of the link member in a state of being detached from the second cam member.
According to this configuration, the locking member can be immediately moved to the restriction position by the urging force when it is released from the contact state in the second surface perpendicular to the first surface on which the link member moves. It is possible to reliably prevent the recoil and to further shorten the time lag from the release operation to the completion of shooting.

  According to the focal plane shutter having the above configuration, it is possible to shorten the time lag from the release operation to the completion of photographing while preventing the recoil of the set member while achieving simplification of the structure, miniaturization, etc. It is possible to obtain a focal plane shutter for a camera that can increase the continuous shooting speed during continuous shooting and can shorten a series of control sequences.

1 shows an embodiment of a focal plane shutter according to the present invention, in which a set member is returned to a rest position, a locking member is in a restricting position, and a driving member (and a blade member) has completed a shutter operation. It is a top view. In the state shown in FIG. 1, a plane showing only components such as a drive member, a set member, a drive mechanism (link member, swing member, first cam member, etc.), and a restriction mechanism (locking member, second cam member, etc.). FIG. In the state shown in FIG. 1, a side surface showing only components such as a drive member, a set member, a drive mechanism (link member, swing member, first cam member, etc.), and a restriction mechanism (locking member, second cam member, etc.). FIG. FIG. 3 is a plan view showing a state where cam members (first cam member, second cam member) rotate from the shutter operation completion state shown in FIG. 1 and the locking member returns from a restriction position to a release position where the restriction is released. is there. In the state shown in FIG. 4, side surfaces showing only components such as a drive member, a set member, a drive mechanism (link member, swing member, first cam member, etc.), and a restriction mechanism (locking member, second cam member, etc.). FIG. The cam members (first cam member, second cam member) rotate from the restriction release state shown in FIG. 4, and the set member performs the set operation to set the drive member (and the blade member) at the set position (first) It is a top view which shows the state which the blade | wing closed the opening part and the rear blade | wing opened the opening part). In the state shown in FIG. 6, a plane showing only components such as a drive member, a set member, a drive mechanism (link member, swinging member, first cam member, etc.), and a restriction mechanism (locking member, second cam member, etc.). FIG. In the state shown in FIG. 6, side surfaces showing only components such as a drive member, a set member, a drive mechanism (link member, swing member, first cam member, etc.), and a restriction mechanism (locking member, second cam member, etc.). FIG. The contact position where the cam member (first cam member, second cam member) rotates from the state where the set operation shown in FIG. 6 is completed, and the locking member allows movement of the link member while contacting a part of the link member. It is a top view which shows the state positioned by. In the state shown in FIG. 9, a side surface showing only components such as a drive member, a set member, a drive mechanism (link member, swing member, first cam member, etc.), and a restriction mechanism (locking member, second cam member, etc.). FIG. The cam members (first cam member, second cam member) rotate from the state shown in FIG. 9, the set member returns to the rest position by the urging force, and the locking member faces a part of the link member so that the link member It is a top view which shows the state located in the control position which can control the movement of this. In the state shown in FIG. 11, side surfaces showing only components such as a drive member, a set member, a drive mechanism (link member, swing member, first cam member, etc.), and a restriction mechanism (locking member, second cam member, etc.). FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, the focal plane shutter according to this embodiment includes a base plate 10, a leading blade 20 and a trailing blade 30 as blade members, and a leading blade drive lever 40 as a driving member for driving the leading blade 20. And the urging spring 50, the trailing blade driving lever 60 and the urging spring 70 as driving members for driving the trailing blade 30, the attracted portion 80 provided on the leading blade driving lever 40 and the trailing blade driving lever 60, and the leading blade, respectively. Shutter operation of the two electromagnets 90, the leading blade driving lever 40 and the trailing blade driving lever 60 provided in correspondence with each other to exert a magnetic attractive force on the attracted portion 80 of the driving lever 40 and the trailing blade driving lever 60. A set member 100 that is set at the previous set position, a biasing spring 110 that biases the set member 100 to rotate toward the rest position, and a set member 100 The drive mechanism 120 (the link member 121, the swinging member 122, the first cam member 123, the gear train 124, the motor 125) that performs the set operation, and the set member 100 moves in the opposite direction when returning to the rest position. A restriction mechanism 130 (locking member 131, urging spring 132, second cam member 133) for restriction is provided. The base plate 10 has a predetermined intermediate plate (not shown) for defining a blade chamber for accommodating the leading blade 20 and a back plate (not shown) for defining a blade chamber for accommodating the trailing blade 30 on the back side of each mechanism. It is fixed at intervals.

As shown in FIGS. 1 to 4, the main plate 10 is a flat main plate 11 that defines a substantially rectangular exposure opening 11 a and a support fixed to the main plate 11 at a predetermined interval. A plate 12 is provided.
As shown in FIG. 1, the main base plate 11 includes an opening 11a, an arc-shaped long hole 11b and a long hole 11c, and a support shaft 11d erected on the blade chamber side so as to rotatably support the leading blade 20. 11e, supporting shafts 11f and 11g which are erected on the blade chamber side to support the rear blade 30 so as to be rotatable, and a support which is erected on the outer side of the blade chamber to rotatably support the leading blade drive lever 40. A shaft 11h, a support shaft 11i erected on the outer side of the blade chamber to rotatably support the rear blade drive lever 60, and a support erected on the outer side of the blade chamber to rotatably support the set member 100. A shaft 11j and the like are provided.
As shown in FIG. 1, the support plate 12 includes holding portions 12a, 12b for holding two electromagnets 90, fitting holes 12c, 12d, 12e for fitting and fixing the support shafts 11h, 11i, 11j, and screws. Fixing portions 12 f and 12 g for fixing to the main base plate 11 are provided.

As shown in FIGS. 1 and 6, the leading blade 20 is composed of three blade bodies 21, 22, 23 and two arms 24, 25 that connect the blade bodies 21, 22, 23.
The arm 24 is rotatably supported by the support shaft 11d, and a part of the arm 24 is connected to the drive pin 41 of the leading blade drive lever 40.
The arm 25 is rotatably supported by the support shaft 11e.
Then, as shown in FIG. 6, when the arm 24 is driven upward (counterclockwise) by the leading blade driving lever 40, the three blade bodies 21, 22, and 23 are opened and opened. On the other hand, as shown in FIG. 1, the three blade bodies 21, 22 and 23 are overlapped and opened by being driven downward (clockwise) by the leading blade driving lever 40 as shown in FIG. 1. The part 11a is opened.

As shown in FIGS. 1 and 6, the rear blade 30 is composed of three blade bodies 31, 32, 33 and two arms 34, 35 that connect the blade bodies 31, 32, 33.
The arm 34 is rotatably supported by the support shaft 11 f, and a part of the arm 34 is connected to the drive pin 61 of the rear blade drive lever 60.
The arm 35 is rotatably supported by the support shaft 11g.
Then, as shown in FIG. 6, the arm 34 is driven upward (counterclockwise) by the rear blade drive lever 60, so that the three blade bodies 31, 32, and 33 are overlapped to open the opening portion. 11a is opened, and on the other hand, as shown in FIG. 1, when driven downward (clockwise) by the rear blade drive lever 60, the three blade bodies 31, 32, 33 are unfolded and opened. The part 11a is closed.

2 and 7, the leading blade driving lever 40 includes a driving pin 41 to which the arm 24 is coupled, an engaging portion 42 to which the set member 100 is engaged and a rotational force is exerted counterclockwise, The holding part 43 etc. which hold | maintain the adsorption | suction part 80 are provided, and it is rotatably supported by the spindle 11h.
The drive pin 41 is inserted into the long hole 11b of the main base plate 11 and stops at the rotating end rotated clockwise in contact with a buffer member (not shown) such as rubber fixed to the long hole 11b. It has become.

  The urging spring 50 is a torsion coil spring, and is arranged around the support shaft 11h as shown in FIGS. 2 and 7, and one end (not shown) is hooked on a part of the leading blade drive lever 40. The other end (not shown) is disposed on the support shaft 12h so as to be rotatable coaxially with the leading blade drive lever 40, and is latched on an adjustment wheel (ratchet cylinder) 55 positioned by the support plate 12 (the ratchet pawl). Thus, the leading blade driving lever 40 is formed so as to exert a biasing force that biases the leading blade driving lever 40 to rotate clockwise in FIG.

2 and 7, the trailing blade driving lever 60 includes a driving pin 61 to which the arm 34 is coupled, an engaging portion 62 to which the set member 100 is engaged and a rotational force is exerted counterclockwise, The holding part 63 etc. which hold | maintain the adsorption | suction part 80 are provided, and it is rotatably supported by the spindle 11i.
The drive pin 61 is inserted into the long hole 11c of the main base plate 11 and stops at the rotating end rotated clockwise in contact with a buffer member (not shown) such as rubber fixed to the long hole 11c. It has become.

  The urging spring 70 is a torsion coil spring, and is arranged around the support shaft 11i as shown in FIGS. 2 and 7, and one end (not shown) is hooked on a part of the rear blade drive lever 60. The other end (not shown) is hooked on an adjustment wheel (ratchet cylinder) 75 that is rotatably disposed coaxially with the rear blade drive lever 60 on the support shaft 11f and is positioned by the support plate 12 (the ratchet pawl). Thus, the rear blade drive lever 60 is formed so as to exert an urging force for urging the rear blade drive lever 60 clockwise in FIG.

2 and 7, the attracted portion 80 includes an iron piece 81 attracted to the iron core member 91 of the electromagnet 90, an urging spring 82 that urges the iron piece 81 in one direction, and the like.
As shown in FIG. 1, the electromagnet 90 is held by the holding portions 12 a and 12 b of the support plate 12 and wound around a bobbin around the iron core member 91 and the iron core member 91 having a predetermined length. An exciting coil 92 and the like are included.
And by applying electricity to the coil 92, a magnetic force line passing through the iron core member 91 is generated, and a magnetic attractive force is exerted on the opposed attracted portion 80 (the iron piece 81).

  As shown in FIGS. 2 and 7, the set member 100 is rotatably supported by a support shaft 11j in a plane parallel to the plane on which the blade members (20, 30) move. 40, the engaging portion 101 that can be engaged with the engaging portion 42, the engaging portion 102 that can be engaged with the engaging portion 62 of the trailing blade driving lever 60, and the connecting portion 103 to which the link member 121 of the driving mechanism 120 is connected. , A latching portion 104 or the like on which one end 111 of the biasing spring 110 is latched is provided.

The urging spring 110 is a torsion coil spring, and is disposed around the support shaft 11j as shown in FIGS. 2 and 7, and one end 111 is hooked on the hooking portion 104 of the set member 100. The end portion 112 is hooked on a part 10a of the main plate 10 (the main main plate 11 or the support plate 12), and exerts a biasing force to rotate the biasing of the set member 100 counterclockwise in FIG. It is formed as follows.
When the set member 100 rotates clockwise from the rest position (exposure operation completion position) shown in FIGS. 1 and 2 against the urging force of the urging spring 110 by the driving force exerted by the driving mechanism 120, The joining portion 101 exerts a rotational force on the engaging portion 42 and the engaging portion 102 exerts a rotational force on the engaging portion 62. As shown in FIGS. 6 and 7, the leading blade driving lever 40 and the trailing blade driving lever 60 is rotated counterclockwise against the rotational biasing force of the respective biasing springs 50 and 70, and is set to the set position before the shutter operation. When the rear blade drive lever 60 is attracted and held by the electromagnet 90 and is attracted and held by the electromagnet 90, when it rotates counterclockwise by the biasing force of the biasing spring 110 and returns to the rest position, FIG. As shown in FIG. 2, the engaging portion 101 is disengaged from the engaging portion 42 and the engaging portion 102 is disengaged from the engaging portion 62, and the leading blade driving lever 40 and the trailing blade driving lever 60 are rotated clockwise. Is in a state that permits.

As shown in FIGS. 1 to 3, the drive mechanism 120 is disposed on the main base plate 11, which is partially omitted, and includes a link member 121 connected to the set member 100, and a rocker connected to the link member 121. The first cam member 123 that exerts a cam action on the moving member 122, the swing member 122, the gear train 124 that transmits the rotational force to the first cam member 123 (and the second cam member 133), and the drive gear that meshes with the gear train 124 A motor 125 having 125a is provided.
As shown in FIGS. 1 to 3, the link member 121 has one end portion 121 a, a bent end portion 121 b having a long hole, and a contact surface on which the engaging portion 131 a of the locking member 131 can come into contact. 121c, an engagement portion 131a of the engagement member 131 that is formed adjacent to the contact surface 121c and that can be restrained to move, and a surface on which the set member 100 moves (turns). The first end 121a is connected to the connecting portion 103 of the set member 100, and the other end 121b (long hole) is one end 122a (pin) of the swing member 122. It is connected to.
As shown in FIGS. 9 and 10, the contact surface 121 c is formed so as to come into contact with the flat portion of the engagement portion 131 a when the locking member 131 is in the contact position.
As shown in FIGS. 2 and 3, the locked portion 121 d is formed so that its movement is restricted facing the edge portion of the engaging portion 131 a when the locking member 131 is in the restricting position.
As shown in FIG. 3, the swing member 122 is cammed by a connecting portion 122 a having a pin, a pivot support portion 122 b supported by a support shaft of the main base plate 11, which is partially omitted, and a first cam member 123. The follower portion 122c and the like are provided, and the link member 121 is formed so as to swing about the pivot portion 122b as a fulcrum in a second surface perpendicular to the first surface on which the link member 121 moves.
The first cam member 123 exerts a cam action on a support shaft hole 123a through which a support shaft (not shown) provided on the camera body or another substrate is passed, and a follower portion 122c of the swing member 122. Part 123b.
When the first cam portion 123b rotates counterclockwise from the state shown in FIG. 3 to the state shown in FIG. 5 to the state shown in FIG. 8, the set member 100 is interposed via the swing member 122 and the link member 121. Is rotated clockwise from the rest position to cause the set member 100 to perform the set operation, and further, after rotating through the state shown in FIG. 10 to the state shown in FIG. 12, the cam action on the swing member 122 is released. The set member 100 is allowed to return to the rest position by the urging force of the urging spring 110 (detached from the follower portion 122c).

As shown in FIGS. 1 to 3, the restricting mechanism 130 includes an engaging member 131 that can restrict the movement of the link member 121, an urging spring 132 that urges the engaging member 131 to rotate in one direction, and an engaging member 131. The second cam member 133 or the like that exerts a cam action on the cam is provided.
As shown in FIGS. 1 to 3, the locking member 131 is detachably contacted with the contact surface 121 c of the link member 121 and can be detachably engaged opposite to the locked portion 121 d. Part 131a, a pivotal support part 131b supported by a support shaft of the main base plate 11 (not shown), a follower part 131c that receives a cam action by the second cam member 133, etc. It is formed so as to oscillate with the pivot 131b as a fulcrum in a second surface perpendicular to the surface.
The urging spring 132 is a torsion coil spring disposed around the pivotal support 131b. The main base plate 11 is shown with one end 132a hooked to a part of the locking member 131 and the other end 132b partially omitted. The engaging member 131 is configured to exert an urging force that urges the locking member 131 to rotate toward the second cam member 133 (clockwise in FIG. 3).
The second cam member 133 is a second cam that exerts a cam action on a support shaft hole 133a through which a support shaft (not shown) provided on the camera body or other substrate is passed, and a follower portion 131c of the locking member 131. A portion 133b is provided, and is formed to rotate integrally with the first cam member 123 coaxially.

Then, when the second cam portion 133b rotates counterclockwise through the state shown in FIG. 3 and reaches the state shown in FIG. 5, it exerts a cam action on the follower portion 131c to move the locking member 131 counterclockwise from the restricted position. When it is rotated to the release position for releasing the regulation and further rotated to the state shown in FIG. 10 through the state shown in FIG. 8, the cam action on the locking member 131 is released (detached from the follower part 131c). Thus, the urging force of the urging spring 132 allows the engaging portion 131a (the flat surface portion) of the locking member 131 to contact the contact surface 121c of the link member 121, and further reaches the state shown in FIG. , The follower portion 131c is engaged, and the locking member 131 is positioned at the restricting position (the position where the edge portion of the engaging portion 131a faces the locked portion 121d). There.
Here, since the second cam member 133 is formed so as to rotate integrally coaxially with the first cam member 123, both cam members (first cams) are driven by the driving force of one drive source (motor 125). The cam member 123 and the second cam member 133) can be rotated, and the relative timing at which each cam member (123, 133) exerts a cam action can be set with high accuracy.

That is, when the first cam member 123 is rotated in one direction by the motor 125, the swing member 122 is moved in one direction and the link member 121 is moved in one direction, so that the setting member 100 performs the setting operation. When the blade driving lever 40 (and the leading blade 20) and the trailing blade driving lever 60 (and the trailing blade 30) are set at the set position and the first cam member 123 further rotates to release the cam action, the biasing spring 110 The set member 100 returns to the rest position by the urging force, and when the second cam member 133 rotates in one direction together with the first cam member 123 to release the cam action, the set member 100 is locked by the urging force of the urging spring 132. The member 131 is positioned at a position where the movement of the link member 121 can be restricted by moving in one direction.
In this way, the restriction mechanism 130 restricts the reaction of the set member 100 by restricting the movement of the link member 121 that forms part of the drive mechanism 120 connected to the set member 100, that is, one of the drive mechanisms 120. In order to regulate the movement of the link member 121 that forms a part, a regulating mechanism can be provided while simplifying the structure and reducing the size without adding new parts around the set member 100.

The locking member 131 is positioned at a contact position that allows movement of the link member 121 while being in contact with the contact surface 121c of the link member 121 when the set member 100 completes the setting operation to the set position. When 100 is returned to the rest position, it is formed so as to be positioned at a restricting position where the movement of the link member 121 can be restricted facing the locked portion 121d of the link member 121. Since it is held at the contact position that contacts a part of the link member 121 (contact surface 121c) when the set operation is completed, the link member immediately moves from the contact position to the restricting position when the set member 100 returns to the rest position. The movement of 121 can be regulated, and the regulating operation can be performed with quick movement.
Further, the locking member 131 is formed so as to move in a second surface perpendicular to the first surface on which the link member 121 moves, and is one of the link members 121 in a state of being detached from the second cam member 133 at the contact position. Since the locking member 131 is biased to come into contact with the contact portion (contact surface 121c), the biasing spring 132 is released when the locking member 131 is released from the contact state in the second surface perpendicular to the first surface on which the link member 121 moves. Therefore, the set member 100 can be reliably prevented from rebounding, and the time lag from the release operation to the completion of photographing can be further shortened.

Next, the operation of this focal plane shutter will be described.
First, in the rest state after the shutter operation is completed (after the exposure operation is completed), the set member 100 is rotated counterclockwise by the biasing force of the biasing spring 110 to the rest position as shown in FIGS. The leading blade drive lever 40 is rotated clockwise by the urging force of the urging spring 50 and stopped, the leading blade 20 is located at a position where the opening 11a is opened, and the trailing blade drive lever 60 is The rear blade 30 rotates and stops clockwise by the rotational biasing force of the biasing spring 70, and the rear blade 30 is located at a position where the opening 11a is closed.
In this resting state, as shown in FIGS. 2 and 3, the locking member 131 is positioned at a restricting position where the engaging portion 131a faces the locked portion 121d and restricts the movement of the link member 121. Yes.

Here, when a shutter operation preparation command is issued in response to a set operation command before the exposure operation, the cam members (the first cam member 123 and the second cam member 133) rotate in one direction (counterclockwise). As shown in FIG. 5, the locking member 131 moves to the release position with the leading blade 20, the trailing blade 30, and the set member 100 intact (the engaging portion 131 a is the locked portion 121 d of the link member 121. Move to a position that deviates from
When the cam members (the first cam member 123 and the second cam member 133) further rotate in one direction (counterclockwise), the locking member 131 is held at the release position as shown in FIGS. In this state, the first cam member 123 exerts a cam action on the swing member 122 and the link member 121 moves, and the set member 100 rotates clockwise against the urging force of the urging spring 110, The joining portion 101 engages with the engaging portion 42 to rotate the leading blade drive lever 40 counterclockwise, the leading blade 20 moves to a position where the opening portion 11a is closed, and the engaging portion 102 engages with the engaging portion 62. And the rear blade drive lever 60 is rotated counterclockwise, and the rear blade 30 moves to a position where the opening 11a is opened. Thereby, the setting operation by the setting member 100 is completed.
That is, the leading blade drive lever 40 (and the leading blade 20) is positioned at the set position before the shutter operation (the state where the opening 11a is closed), and the trailing blade drive lever 60 (and the trailing blade 30) is set before the shutter operation. It is positioned at a position (a state in which the opening 11a is opened).

  Subsequently, when a shutter operation (exposure operation) command is issued by a signal such as a release, the electromagnet 90 (coil 92 thereof) is energized, and the iron core member 91 attracts the attracted portion 80 by magnetic attraction force. The leading blade driving lever 40 and the trailing blade driving lever 60 are securely held and positioned at the set position against the urging force of the urging springs 50 and 70 that urge the rotation clockwise.

9 and 10, when the cam members (the first cam member 123 and the second cam member 133) further rotate in one direction (counterclockwise), the leading blade 20, the trailing blade 30, and the set member 100 is left as it is, the follower portion 131c of the locking member 131 is detached from the cam portion 133b of the second cam member 133, and the locking member 131 is rotated clockwise by the biasing force of the biasing spring 132. The engaging member 131 is held in contact with the joint portion 131a (the flat portion thereof) while contacting the contact surface 121c of the link member 121.
That is, when the set member 100 completes the setting operation to the set position, the locking member 131 is in a contact position that allows movement of the link member 121 while contacting a part of the link member 121 (contact surface 121c). Positioned.

Subsequently, when the cam members (the first cam member 123 and the second cam member 133) are further rotated in one direction (counterclockwise), as shown in FIGS. 11 and 12, the leading blade 20 and the trailing blade 30 remain as they are. In this state, the follower portion 122c of the swinging member 122 is detached from the first cam portion 123b of the first cam member 123 so that the swinging member 122 can freely move, and by the biasing force of the biasing spring 110, The link member 121 moves in conjunction with the return of the set member 100 to the rest position, the contact between the engaging portion 131a and the contact surface 121c is released, and the locking member 131 is moved to the timepiece by the biasing force of the biasing spring 132. The follower portion 131c engages with the second cam portion 133b, and at the same time, the engaging portion 131a (the edge portion thereof) is positioned at the restriction position facing the locked portion 121d. Recoil setting member 100 tends to move in the opposite direction from the rest position (bounce) is regulated.
That is, the locking member 131 is positioned at a restriction position where the movement of the link member 121 can be restricted facing a part of the link member 121 (the locked portion 121d) when the set member 100 returns to the rest position. It is done.

Thereafter, when the energization of the two electromagnets 90 is cut off at different desired timings, first, the leading blade drive lever 40 is rotated clockwise by the biasing force of the biasing spring 50, and the leading blade 20 travels, , The trailing blade drive lever 60 rotates clockwise by the biasing force of the biasing spring 70 and the trailing blade 30 travels. As shown in FIG. 1, the leading blade 20 opens the opening 11a. The rear blade 30 closes the opening 11a.
As described above, the opening / closing operation of the opening 11a is performed by the leading blade 20 and the trailing blade 30, and the shutter operation (exposure operation) is completed.

As described above, when the set member 100 returns to the rest position (position before the set operation) by the urging force (when it contacts the stopper or the like in the rest position), the restriction mechanism 130 (the locking member 131) Since the recoil (bound) in which the set member 100 moves in the opposite direction is restricted, the blade member (the leading blade 20 and the rear blade 30) travels immediately after the set member 100 returns to the rest position to complete the shutter operation. Can be made.
As described above, according to the focal plane shutter having the above-described configuration, the structure member can be simplified and downsized, and the set member 100 can be prevented from rebounding to shorten the time lag from the release operation to the completion of photographing. In addition, it is possible to obtain a focal plane shutter for a camera that can increase the continuous shooting speed during continuous shooting and can shorten a series of control sequences.

In the above embodiment, in the configuration including the leading blade 20 and the trailing blade 30, the configuration (regulating mechanism 130) of the present invention is adopted for the leading blade driving lever 40 and the trailing blade driving lever 60. Although the case where this invention was employ | adopted in the structure provided with the wing | blade member was shown, it is not limited to this, For example, it is equipped with one wing | blade member and moves from the state which opened the opening part to the closed state simply Thus, the present invention can be adopted in a configuration that performs a shutter operation.
In the above-described embodiment, the case where the configuration including the locking member 131, the urging spring 132, the second cam member 133, and the like is employed as the restriction mechanism has been described. As long as the reaction of 100 can be regulated, a regulating mechanism having another configuration can be adopted.
In the above-described embodiment, the case where the structure including the link member 121, the swinging member 122, the first cam member 123, and the like is employed as the drive mechanism has been described. As long as the set operation is performed, a drive mechanism having another configuration can be employed.
In the above embodiment, the leading blade driving lever 40 and the trailing blade driving lever 60 that rotate around a predetermined axis are employed as the driving member, and the set member 100 that rotates around the predetermined axis is employed as the setting member. However, the present invention is not limited to this, and the present invention may be applied to other forms of drive members and set members.

  As described above, the focal plane shutter according to the present invention can reduce the time lag from the release operation to the completion of photographing while preventing the reaction of the set member while achieving simplification and downsizing of the structure. Because it can increase the continuous shooting speed during continuous shooting and shorten the series of control sequences, it can be applied to cameras such as silver film cameras and digital cameras, as well as other exposures. It is also useful for an optical apparatus having an opening.

10 ground plane 11a opening 20 leading blade (blade member)
30 Rear blade (blade member)
40 Leading blade drive lever (drive member)
50 Biasing spring 60 Rear blade drive lever (drive member)
70 Energizing spring 80 Adsorbed part 90 Electromagnet 100 Set member 110 Energizing spring 120 Drive mechanism 121 Link member 121c Contact surface 121d Engaged part 122 Oscillating member 122b Follower part 123 First cam member 123b First cam part 130 Restriction Mechanism 131 Locking member 131b Follower part 131a Engaging part 132 Biasing spring 133 Second cam member 133b Second cam part

Claims (5)

A ground plane having an opening for exposure;
A blade member movably provided on the base plate to open and close the opening,
A drive member biased in one direction to drive the blade member;
A set member biased to return to a rest position after the drive member is attracted and held at the set position by an electromagnet while being able to set the drive member against a biasing force against a biasing force;
A link member connected to the set member to perform a set operation;
A swing member connected to the link member;
A first cam member that rotates to exert a cam action on the swing member to move the link member;
A locking member that abuts the link member and locks the link member to restrict the set member from moving in the opposite direction; A second cam member for releasing the locking by the locking member when the link member is moved by exerting a cam action on the moving member;
A focal plane shutter.   The focal plane shutter according to claim 1, further comprising a biasing member that biases the locking member so as to lock the link member. The locking member contacts the contact surface of the link member when the set member completes the set operation to the set position, allows the link member to move, and the set member returns to the rest position. 3. The focal plane shutter according to claim 2, wherein the movement of the link member is restricted by abutting against a locked portion of the link member when the link member is moved. The link member is formed to move in a first surface parallel to a surface on which the set member moves,
The locking member is formed to move in a second surface perpendicular to the first surface, and the biasing member is in contact with the contact surface in a state of being detached from the second cam member. The focal plane shutter according to claim 3, wherein the focal plane shutter is biased by a member.   An optical apparatus comprising the focal plane shutter according to any one of claims 1 to 4.

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