JP6062348B2 - Focal plane shutter and camera - Google Patents

Description

  The present invention relates to a focal plane shutter having a leading blade and a trailing blade for opening and closing an opening for exposure, and in particular, an object image before photographing can be observed using an electronic viewfinder of a camera such as a digital single-lens camera or a mirrorless camera. In this way, the present invention relates to a focal plane shutter capable of opening a leading blade and a camera using the same.

  As a conventional focal plane shutter, a substantially rectangular base plate having an opening for exposure, a front blade and a rear blade supported movably with respect to the base plate so as to open and close the opening of the base plate, and a tip for driving the front blade A blade driving member (a first driving member coupled to the leading blade and biased so as to follow the second driving member via a biasing force of a backlashing spring of the leading blade, and a first driving member during the shutter operation) (1) a second driving member (main driving member) that pushes the driving member to exert driving force, a rear blade driving member that drives the rear blade, a front blade driving member (second driving member), and a rear blade driving member that perform shutter operations (exposure) Operation) A set member that performs a set operation (charge operation) that sets (charges) to the previous set position, and a first blade drive member that opens the opening during standby before photographing (normally opens). It is equipped with deterrence means (regulation mechanism) that stops the moving member (secondary drive member) at the shutter operation completion position (position where the leading blade fully opens the opening), and deters it during the set operation (charge operation). It is known that the movement of the leading blade driving member (first driving member) is stopped by means so that the opening is opened and the subject image before photographing can be observed using an electronic viewfinder (for example, Patent Document 1).

However, in this focal plane shutter, the relationship between the first driving member and the second driving member constituting the leading blade driving member is that the first driving member connected to the leading blade is set by the setting member (charging operation). The second drive member that is directly operated is configured to follow the urging force of a backlash spring that backlashes the leading blade.
Accordingly, when the second drive member is set (charged) to the set position by the set member in a state where the deterring means is inactive (a state where the first drive member is not inhibited), the first drive member Since it moves to the set position following the second drive member only with the urging force, if the charge speed is increased during the continuous shooting or the like (the charge time is shortened), the first drive member is moved to the first position due to the weight of the leading blade. 2 There is a possibility that re-exposure may be caused without following the drive member, and therefore there is a problem that the charge speed cannot be increased (the charge time cannot be shortened).

JP 2011-137986 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a driving member for the leading blade by two driving members so that a subject image before photographing can be observed using an electronic viewfinder. Consecutive shooting (continuous shooting) in the focal plane shutter for cameras that is configured, even if the charging speed by the set member is increased while simplifying the structure and downsizing the device. Is to provide a focal plane shutter capable of continuous shooting at a high speed and a camera using the same.

The focal plane shutter of the present invention is provided with a ground plate having an opening for exposure, a leading blade movably provided on the ground plate to open and close the opening, and a movably provided on the ground plate to open and close the opening. The rear blade, the leading blade driving member biased to drive the leading blade, the trailing blade driving member biased to drive the trailing blade, the leading blade driving member and the trailing blade driving member against the biasing force And a leading blade drive member that is set at the set position before the shutter operation while the set member engages and resists the urging force, and a set member that can be set at the set position before the shutter operation. A slave drive member coupled to the leading blade and biased to follow the master drive member set at the set position is included to regulate the follow-up of the slave drive member under a predetermined condition during the set operation by the set member. Operate A focal plane shutter further provided with a restriction mechanism, and provided with an auxiliary mechanism for assisting the follower member to follow when the main drive member moves to the set position when the restriction mechanism is in an inoperative state. It is characterized by.
According to this configuration, in the mode in which the restriction mechanism operates (the object image before photographing can be observed with the electronic viewfinder), the shutter operation (exposure operation) is completed (the front blade opens the opening and the rear When the set member starts the set operation (charge operation) from the state where the blade closed the opening), the slave drive member of the leading blade drive member is left as it is (the front blade opens the opening) by the regulating mechanism. The main driving member and the trailing blade driving member of the leading blade driving member were set at the set position against each biasing force, and the main driving member and the trailing blade driving member were held at the setting position by an electromagnet or the like. Later, the set member is returned to the rest position by an urging force (such as a return spring) and the mechanical restriction is released, and the restriction of the restriction mechanism is released and the driven member is moved (such as a backlash spring for the leading blade). ) After moving to the set position following the main drive member by the biasing force of the bias spring, the leading blade drive member and the trailing blade drive member are turned off by energizing the electromagnet or the like (as the main drive member pushes the slave drive member). The front blade and the rear blade are moved by the urging force and travel at desired timings to perform a shutter operation (exposure operation).
Further, in the mode in which the regulating mechanism does not operate (the object image before photographing is not observed with the electronic viewfinder), the shutter operation (exposure operation) is completed (the leading blade opens the opening and the trailing blade opens the opening). When the set member starts the set operation (charge operation) from the closed state, the main drive member and the rear blade drive member (of the leading blade drive member) are set at the set position against the respective biasing forces. The secondary drive member (of the leading blade drive member) is set to the set position following the main drive member by being assisted by an auxiliary mechanism in addition to the urging force (such as the backlash spring of the leading blade). After the blade drive member is held at the set position by an electromagnet or the like, when the set member is returned to the rest position by an urging force (such as a return spring) and the mechanical restriction is released, the electromagnet or the like is turned off. (As the main drive member pushes the slave drive member), the leading blade driving member and the trailing blade driving member are moved by the urging force, and the leading blade and the trailing blade respectively travel at desired timings to perform the shutter operation (exposure operation). I do.
Here, when the regulating mechanism is in an inoperative state, an auxiliary mechanism that assists the tracking of the driven member when the main driving member moves to the set position is provided. Since it is set to the set position following the member reliably, the desired exposure operation can be obtained even if the charging speed by the set member is increased, and the frame speed (number of frames) for continuous shooting (continuous shooting) is increased. , Continuous shooting at high speed is possible.

In the above configuration, the auxiliary mechanism presses or pulls the slave drive member against the main drive member that moves toward the set position and biases the slave drive member relative to the master drive member in a state where the regulation mechanism is activated. A configuration including an urging member that can be elastically deformed so as to allow general movement can be employed.
According to this configuration, as an auxiliary mechanism, an urging member that can be elastically deformed (for example, a coil spring or a leaf spring that presses the driven member toward the main driving member, or the driven member toward the main driving member). Therefore, the auxiliary drive member can be made to follow the main drive member while achieving simplification of the structure, downsizing of the apparatus, and the like.

In the above configuration, the urging member is a leaf spring provided in the main drive member so as to be able to contact the contact portion provided in the slave drive member and to be elastically deformed and bent against a predetermined or more resistance force. A configuration can be employed.
According to this configuration, by adopting a plate spring as the urging member, when the main drive member moves to the set position, the contact portion provided with the plate spring provided on the main drive member on the slave drive member To support the follower drive member, the follower drive member can reliably follow the main drive member. On the other hand, when the restriction mechanism operates to restrict the movement of the follower drive member, a predetermined value or more Since the leaf spring is elastically deformed and deviates from the state of pressing the contact portion against the resistance force, only the main drive member can be moved to the set position and the slave drive member can be stopped while being regulated.

In the above configuration, the main drive member and the slave drive member are arranged so as to rotate around the same axis, the leaf spring is formed to bend in a plane perpendicular to the axis, and the contact portion is a plate It is possible to adopt a configuration that is formed to extend parallel to the axis so as to be in contact with the tip region of the spring.
According to this configuration, in a state where the main drive member and the slave drive member are arranged so as to rotate about the same axis, the main drive member moves in a plane perpendicular to the axis, thereby allowing the leaf spring to move. The tip region of the contact member is formed so as to be in contact with the contact portion and elastically deformed (flexible), and therefore, the contact operation by the pressing operation of the driven member (contact portion thereof) and elastic deformation is performed with a simple structure. Can be released (operation that allows relative movement).

In the above configuration, the tip region of the leaf spring is formed to be convexly curved toward the contact portion, and the contact portion is formed in a cylindrical shape extending in parallel with the axis. Can do.
According to this configuration, since the tip end region of the leaf spring that is curved in a convex shape is formed so as to contact the cylindrical contact portion, (when the restriction mechanism operates to restrict the movement of the driven member) When a resisting force of a predetermined value or more is applied, the tip region of the leaf spring is elastically deformed and is surely released from the contact portion to release the pressure, and only the main drive member is moved to the set position to move the sub drive member. Can remain in a restricted position.

The camera of the present invention includes a focal plane shutter having any one of the above-described configurations.
According to this configuration, the desired exposure operation can be obtained even when the charging speed by the set member is increased while achieving the simplification of the structure, the miniaturization of the apparatus, etc., and the continuous shooting (continuous shooting) frame speed ( The number of frames) can be increased, and a camera capable of continuous shooting at high speed can be obtained.

  According to the focal plane shutter having the above-described configuration, in the focal plane shutter for a camera in which the driving member of the leading blade is configured by two driving members so that the subject image before photographing can be observed using the electronic viewfinder, While achieving simplification, downsizing of the device, etc., even if the charging speed by the set member is increased, the desired exposure operation can be obtained, and the frame speed (number of frames) of continuous shooting (continuous shooting) is increased and high speed is achieved. It is possible to provide a focal plane shutter and a camera that are capable of continuous shooting at the same time.

1 is an external perspective view showing an embodiment of a focal plane shutter according to the present invention. FIG. 2 is a partially enlarged perspective view in which a part of the focal plane shutter shown in FIG. 1 is enlarged. In the focal plane shutter shown in FIG. 1, the leading blade driving member and the trailing blade driving member, the set member, the leading blade and the trailing blade, the regulating mechanism, and the auxiliary mechanism are shown, and the leading blade driving member (and the leading blade) and the rear blade are shown. It is a partial front view which shows the state which the blade drive member (and the rear blade) completed the shutter operation (exposure operation), that is, the state where the front blade opened the opening and the rear blade closed the opening. FIG. 4 is a partial front view showing states of a leading blade driving member (a main driving member and a secondary driving member), a trailing blade driving member, and a set member in the state shown in FIG. 3. In the focal plane shutter shown in FIG. 1, the leading blade driving member and the trailing blade driving member, the set member, the leading blade and the trailing blade, the regulating mechanism, and the auxiliary mechanism are shown. It is a partial front view which shows the state in the middle of a drive member (and front blade | wing) and a rear blade drive member (and rear blade | wing) being set (charged) toward a set position by the set member. In the focal plane shutter shown in FIG. 1, the leading blade driving member and the trailing blade driving member, the set member, the leading blade and the trailing blade, the regulating mechanism, and the auxiliary mechanism are shown. It is a partial front view which shows the state by which the drive member (and front blade | wing) and the rear blade drive member (and rear blade | wing) were set (charged) to the set position by the set member. FIG. 7 is a partial front view showing a state of a leading blade driving member (a main driving member and a secondary driving member), a trailing blade driving member, and a setting member in the state of completion of setting shown in FIG. 6. In the focal plane shutter shown in FIG. 1, the leading blade driving member and the trailing blade driving member, the set member, the leading blade and the trailing blade, the regulating mechanism, and the auxiliary mechanism are shown. FIG. 6 is a partial front view showing a state before starting a shutter operation (before starting an exposure operation) in which is returned to a rest position. The focal plane shutter shown in FIG. 1 shows a leading blade driving member and a trailing blade driving member, a set member, a leading blade and a trailing blade, a regulating mechanism, and an auxiliary mechanism. In a state where the main driving member (and the front blade) and the rear blade driving member (and the rear blade) of the leading blade driving member are set (charged) toward the set position by the setting member. It is a partial front view which shows the state in the middle of being done. The focal plane shutter shown in FIG. 1 shows a leading blade driving member and a trailing blade driving member, a set member, a leading blade and a trailing blade, a regulating mechanism, and an auxiliary mechanism. In a state where the leading blade driving member (and the leading blade) and the trailing blade driving member (and the trailing blade) are set (charged) to the set position by the set member in a state where the leading blade driving member (and the leading blade) is stopped by being regulated by the regulating mechanism (the leading blade) Is a partial front view showing a state in which the opening is opened and the rear blade opens the opening).

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 4, the focal plane shutter according to this embodiment is movably provided on the base plate 10, the support plate 20 arranged in parallel with the base plate 10 at a predetermined interval, and the base plate 10. The leading blade 30 and the trailing blade 40, the leading blade driving member 50 (the main driving member 51 and the secondary driving member 55) biased to drive the leading blade 30, and the biasing to drive the trailing blade 40 The set member 70 that can set (charge) the blade driving member 60, the leading blade driving member 50, and the trailing blade driving member 60 at the set position before the shutter operation while resisting the urging force. At a predetermined condition, the main driving member 51 is set in a non-operating state. Assist mechanism to assist the tracking of the sub-drive member 55 when moving to the preparative position M (main drive member 51 leaf spring 52 provided on the (setting spring), abutment 56 provided on the sub-drive member 55), Two electromagnets 90 are provided corresponding to the main driving member 51 and the rear blade driving member 60 (to-be-adsorbed portions 51c, 60c) at the set position so as to exert a magnetic attractive force.
The base plate 10 includes an intermediate plate (not shown) that defines a blade chamber that houses the leading blade 30 on the side opposite to the side where the leading blade driving member 50, the trailing blade driving member 60, the set member 70, and the like are disposed. A back plate (not shown) that defines a blade chamber that houses the rear blade 40 is fixed at a predetermined interval.

  As shown in FIGS. 1 and 3, the base plate 10 is formed in a substantially rectangular flat plate shape using a resin material or the like, and has an opening 10a for exposure, an arc-shaped long hole 10b and a long hole 10c, and a tip. Support shafts 10d and 10e provided upright on the blade chamber side to support the blade 30 in a rotatable manner, support shafts 10f and 10g provided upright on the blade chamber side in order to support the rear blade 40 in a turnable manner, and the tip The support shaft 10h is provided upright on the opposite side to the blade chamber side to support the blade driving member 50 in a rotatable manner, and is provided upright on the opposite side to the blade chamber side in order to support the rear blade driving member 60 in a rotatable manner. The supporting shaft 10i, the supporting shaft 10j erected on the opposite side to the blade chamber side so as to rotatably support the set member 70, and the plurality of erected on the opposite side of the blade chamber side to fix the support plate 20 are supported. Fixed portion 10k and the like.

  As shown in FIGS. 1 to 3, the support plate 20 is formed using a metal plate or the like so as to include a flat plate portion and a bent portion, and is connected to one end side of the support shafts 10h, 10i, 10j. 20a, 20b, 20c, a ratchet claw 20d, a holding portion 20e for holding the two electromagnets 90, a plurality of fixing portions 20f for fixing to the fixing portion 10k of the base plate 10 with screws, and the like.

The leading blade 30 moves along the main plate 10 and, as shown in FIGS. 3 and 6, two arms connecting the three blade bodies 31, 32, 33 and the blade bodies 31, 32, 33. 34, 35.
The arm 34 is rotatably supported by the support shaft 10 d, and a part of the arm 34 is connected to a drive pin 55 a of a slave drive member 55 included in the leading blade drive member 50.
The arm 35 is rotatably supported by the support shaft 10e.
The leading blade 30 is urged to rotate counterclockwise by a backlashing spring (not shown) such as a torsion coil spring or a tension spring (provided between the arm 34 or 35 and the base plate 10). 3, 9, and 10, the three blade bodies 31, 32, and 33 are overlapped and opened by being driven downward (clockwise) by the leading blade driving member 50 as shown in FIGS. 3, 9, and 10. On the other hand, as shown in FIGS. 6 and 8, the three blade bodies 31, 32, and 33 are driven by being driven upward (counterclockwise) by the leading blade driving member 50 as shown in FIGS. 6 and 8. The opening 10a is expanded and closed.

The rear blade 40 moves along the main plate 10 and, as shown in FIGS. 3 and 6, two arms connecting the three blade bodies 41, 42, 43 and the blade bodies 41, 42, 43. 44, 45.
The arm 44 is rotatably supported by the support shaft 10 f, and a part of the arm 44 is connected to the drive pin 60 a of the trailing blade drive member 60.
The arm 45 is rotatably supported by the support shaft 10g.
The rear blade 40 is urged to rotate counterclockwise by a backlashing spring (not shown) such as a torsion coil spring or a tension spring (provided between the arm 44 or 45 and the base plate 10). As shown in FIGS. 6 and 8, the blade 44 is driven upward (counterclockwise) by the rear blade driving member 60, so that the three blade bodies 41, 42, and 43 are overlapped to open the opening 10a. On the other hand, as shown in FIG. 3, when driven downward (clockwise) by the rear blade drive member 60, the three blade bodies 41, 42, 43 are developed to open the opening 10a. Is supposed to be closed.

  As shown in FIG. 3, the leading blade driving member 50 is urged to rotate clockwise and is set to the main driving member 51 set at the set position (rotated counterclockwise) by the set member 70, toward the set position. A backlash that is biased to follow the main drive member 51 (rotating counterclockwise) (the drive pin 55a of the slave drive member 55 is connected to the arm 34, thereby loosening the leading blade 30). The driven member 55 is biased counterclockwise via a spring biasing force.

As shown in FIGS. 3 and 4, the main drive member 51 includes an engagement portion 51a that engages with the slave drive member 55, and an engagement portion 51b that engages with the set member 70 and exerts a rotational force counterclockwise. And a portion 51c to be attracted by the electromagnet 90, and a leaf spring 52 as an urging member that forms a part of the regulating mechanism, and is rotatable about the support shaft 10h with respect to the base plate 10. And is urged to rotate clockwise by a biasing spring 53 (lead blade drive spring) .

As shown in FIGS. 2 and 3, the leaf spring 52 can abut against the abutting portion 56 of the slave drive member 55 using a metal spring steel plate or the like (the slave drive member 55 is moved by the restriction mechanism 80). It is formed in the shape of a cantilever so as to be elastically deformed and bent in a plane perpendicular to the axis S1 defined by the support shaft 10h with respect to a predetermined or more resistance force (in a state of being restricted so as not to occur).
Further, the tip region of the leaf spring 52 is formed to be curved in a convex shape toward the contact portion 56 of the driven member 55.
That is, as shown in FIG. 5 and FIG. 6, the leaf spring 52 presses the contact portion 56 provided on the slave drive member 55 when the main drive member 51 moves to the set position, and the main drive member 51 FIG. 9 and FIG. 9 show a resistance force greater than a predetermined value when the subordinate drive member 55 is assisted with respect to 51 to ensure follow-up, while the restriction mechanism 80 is activated to restrict the movement of the subordinate drive member 55. As shown in FIG. 10, since the elastically deformed state deviates from the state of pressing the contact portion 56, only the main drive member 51 moves to the set position while maintaining the stop state due to the restriction of the slave drive member 55. It comes to allow.

The urging spring 53 is a torsion coil spring, and is disposed around the support shaft 10 h as shown in FIGS. 1 and 3, and one end (not shown) is hooked on a part of the main drive lever 51. The other end (not shown) is rotatably arranged around the support shaft 10h and is hooked on an adjustment wheel (ratchet cylinder) 53a positioned by the support plate 20 (the ratchet pawl 20d), and the main drive lever 51 Is formed so as to exert an urging force to urge the rotation clockwise in FIG.
Here, the urging force of the urging spring 53 (clockwise rotation) is set to be larger than the urging force of the backlashing spring (the counterclockwise rotation) that loosens the leading blade 30.

As shown in FIGS. 1 and 3, the sub drive member 55 includes a drive pin 55 a to which the arm 34 is coupled, an engagement portion 55 b that is detachably engaged with the engagement portion 51 a of the main drive lever 51, and a restriction mechanism 80. The control part 81a included in the base plate 10 is provided with an engaging part 55c that engages and controls in a detachable manner, and a contact part 56 that forms part of the control mechanism. While being supported so as to be rotatable around, the main blades 30 are urged to rotate counterclockwise by a rattling spring for rattling the leading blade 30 and follow the main drive member 51 that rotates counterclockwise.
The drive pin 55a is inserted into the long hole 10b of the main plate 10, and stops at the rotating end rotated clockwise in contact with a buffer member such as rubber fixed to the long hole 10b.

As shown in FIGS. 2 and 3, the abutting portion 56 is formed in a columnar shape extending in parallel with the axis S <b> 1 using a metal material or the like, and can abut on the tip region of the leaf spring 52. At the same time, the leaf spring 52 is elastically deformed and bent in a plane perpendicular to the axis S1 with respect to a predetermined or more resistance force (in a state in which the driven member 55 is regulated so as not to move by the regulating mechanism 80). It is firmly formed so as to be moved.
That is, as shown in FIGS. 5 and 6, the contact portion 56 is pressed by the leaf spring 52 when the main drive member 51 moves to the set position, and is driven by the slave drive member 55 with respect to the main drive member 51. 9 and 10 as shown in FIGS. 9 and 10 against the resistance force exceeding a predetermined value when the restriction mechanism 80 is operated to restrict the movement of the driven member 55. The spring 52 is elastically deformed to deviate from the contact state, and only the main drive member 51 is moved to the set position while being stopped at the restricting position together with the driven member 55.

The plate spring 52 and the contact portion 56 having the above-described configuration constitute an auxiliary mechanism M that assists the follower driving member 55 to follow when the main driving member 51 moves to the set position when the regulating mechanism 80 is inactive. Has been.
As described above, the auxiliary mechanism 80 for assisting the follower drive member 55 to follow when the main drive member 51 moves to the set position in the non-actuated state of the restricting mechanism 80 is provided. Since the driving member 55 reliably follows the main driving member 51 and is set at the set position, a desired exposure operation can be obtained even if the charging speed of the setting member 70 is increased, and continuous shooting (continuous shooting) frames are obtained. Increases speed (number of frames) and enables continuous shooting at high speed.
Here, as the auxiliary mechanism M, the slave drive member 55 is pressed relative to the master drive member 51 in a state in which the slave drive member 55 is pressed against the master drive member 51 moving toward the set position and the regulation mechanism 80 is activated. Since the biasing member (plate spring 52) that can be elastically deformed so as to allow for easy movement is included, the slave drive member 55 is made to follow the main drive member 51 while achieving simplification of the structure, miniaturization of the apparatus, and the like. Auxiliary force can be exerted.
In addition, a plate spring 52 provided on the main drive member 51 so as to be able to contact the contact portion 56 provided on the slave drive member 55 as an urging member and to be elastically deformed and bent with respect to a predetermined or more resistance force. In the configuration in which the main drive member 51 and the sub drive member 55 are arranged so as to rotate around the same axis S1, the main drive member 51 moves in a plane perpendicular to the axis S1, Since the tip region of the leaf spring 52 is formed so as to abut against the abutting portion 56 and elastically deform (bend), the pressing operation of the driven member 55 (of the abutting portion 56) is simplified. And a release operation of the contact state by elastic deformation (operation to allow relative movement) can be performed.
Further, the tip region of the leaf spring 52 is formed in a convex shape toward the contact portion 56, and the contact portion 56 is formed in a columnar shape extending in parallel with the axis S1. When a resistance force greater than a predetermined value is applied when the secondary drive member 55 is restricted to operate, the distal end region of the leaf spring 52 is smoothly elastically deformed and reliably released from the contact portion 56 to release the pressure. Then, only the main drive member 51 can be moved to the set position, and the slave drive member 55 can be held at the restriction position.

As shown in FIG. 3, the trailing blade driving member 60 is attracted by the driving pin 60 a to which the arm 44 is connected, the engaging portion 60 b to which the set member 70 is engaged and a rotational force is exerted counterclockwise, and the electromagnet 90. And the like, and is rotatably supported by a support shaft 10i and is urged to rotate clockwise by an urging spring 63 (rear blade drive spring) .
The drive pin 60a is inserted into the long hole 10c of the main plate 10, and stops at the rotating end rotated clockwise in contact with a buffer member such as rubber fixed to the long hole 10c.
The urging spring 63 is a torsion coil spring, and is arranged around the support shaft 10i as shown in FIGS. 1 and 3, and one end (not shown) is hooked on a part of the rear blade drive member 60. The other end (not shown) is rotatably arranged around the support shaft 10i and is hooked on an adjustment wheel (ratchet cylinder) 63a positioned by the support plate 20 (the ratchet pawl 20d) to drive the rear blade. The member 60 is formed so as to exert an urging force for urging the member 60 to rotate clockwise in FIG.
Here, the (clockwise rotation) urging force of the urging spring 63 is set to be larger than the (counterclockwise rotation) urging force of the backlash spring that rattles the rear blade 40.

As shown in FIGS. 3, 4, and 7, the set member 70 is rotatably supported by the support shaft 10 j of the base plate 10, and the engaging portion of the main drive member 51 included in the leading blade drive member 50. 51b, an engagement portion 70b that can be engaged with the engagement portion 60b of the rear blade drive member 60, and the like. A biasing spring (return spring) 73 is urged to rotate counterclockwise.
The set member 70 is in a rest position (exposure operation complete state) shown in FIG. 3 (or FIG. 4) and FIG. 8 against the biasing force of the biasing spring 73 by a driving force exerted by a driving mechanism (not shown). 6), the engaging portion 70a exerts a rotational force on the engaging portion 51b and the engaging portion 70b exerts a rotational force on the engaging portion 60b. As described above, the main drive member 51 and the trailing blade drive member 60 are rotated counterclockwise while resisting the rotational biasing force of the respective biasing springs (53, 63), and set to the set position before the shutter operation. On the other hand, the main drive member 51 and the trailing blade drive member 60 (the attracted portions 51c and 60c) are attracted and held by the electromagnet 90 at the set position, and counterclockwise by the biasing force of the biasing spring 73. Rotate to rest position When returning, as shown in FIG. 8, the engaging portion 70a is disengaged from the engaging portion 51b and the engaging portion 70b is disengaged from the engaging portion 60b, and the leading blade driving member 50 (the main driving member 51, the subordinate driving) The member 55) and the trailing blade driving member 60 are allowed to rotate clockwise.

As shown in FIGS. 3 and 9, the restricting mechanism 80 includes a rotor 81 having a restricting portion 81a rotatably supported within a predetermined angle range with respect to the base plate 10, and a substantially U-shaped forming a magnetic path. The electromagnetic actuator includes a yoke 82, an exciting coil 83, and the like.
When the coil 83 is energized in one direction, the rotor 81 rotates clockwise from the non-operating state shown in FIG. 3 (the state where the restricting portion 81a is disengaged from the engaging portion 55c) to the operating state shown in FIG. Rotating, the restricting portion 81a engages with the engaging portion 55c, and the secondary driving member 55 is restricted from rotating counterclockwise, and the shutter operation completion position (the leading blade 30 has fully opened the opening 10a). On the other hand, when the coil 83 is energized in the opposite direction, the rotor 81 rotates counterclockwise from the position shown in FIG. 9 to the position shown in FIG. Is allowed to rotate counterclockwise.

As shown in FIGS. 1 and 3, the electromagnet 90 is held by the holding portion 20 e of the support plate 20, and is wound around a bobbin around the iron core member 91 having a predetermined length and the iron core member 91. And an exciting coil (not shown).
And by energizing the coil, a line of magnetic force passing through the iron core member 91 is generated, and a magnetic attractive force is exerted on the opposed attracted portions 51c, 60c.

Next, the operation of the focal plane shutter will be described with reference to FIGS.
First, in the rest state after completion of the shutter operation (after completion of the exposure operation), as shown in FIGS. 3 and 4, the set member 70 is rotated counterclockwise by the biasing force of the biasing spring 73 to the rest position. The leading blade drive member 50 rotates clockwise and stops (the main drive lever 51 rotates clockwise by the rotation biasing force of the biasing spring 53, and the slave drive member 55 receives the biasing force of the backlash spring. On the other hand, the leading blade 30 is pushed by the main driving member 61 and rotates clockwise together with the main driving member 51 to stop), and the leading blade 30 is located at a position where the opening 10a is opened, and the trailing blade driving member 60 Is rotated clockwise by the urging force of the urging spring 63 and stopped, and the rear blade 40 is located at a position where the opening 10a is closed.
Further, in this state, the auxiliary mechanism (the leaf spring 52, the contact portion 56) is detached from the contact portion 56 while the leaf spring 52 is not elastically deformed, as shown in FIGS. Is in a state.
Further, as shown in FIG. 3, the restricting mechanism 80 is in an inoperative state in which the rotor 81 rotates counterclockwise and the restricting portion 81 a is detached from the engaging portion 55 c of the driven member 55.

  Here, in the mode in which the restriction mechanism 80 does not operate (the object image before photographing is not observed with the electronic viewfinder), the shutter operation (exposure operation) shown in FIG. 3 is completed (the leading blade 30 opens the opening 10a). When the shutter operation preparation command is issued in response to the set operation command before the exposure operation from the state where the rear blade 40 closes the opening 10a), the set member 70 resists the urging force of the urging spring 73. The set operation is started by rotating clockwise.

  Then, as shown in FIG. 5, the clockwise rotation of the set member 70 causes the engaging portion 70 a to engage with the engaging portion 51 b and cause the main drive member 51 to resist the biasing force of the biasing spring 53. When rotated clockwise, the tip region of the leaf spring 52 provided on the main drive member 51 contacts the contact portion 56 of the slave drive member 55 to assist the follower drive member 55, and the slave drive member 55 In addition to the biasing force of the backlash spring for backlashing the front blade 30, the leaf spring 52 reliably follows the main drive member 51 and rotates counterclockwise, and engages at a slightly delayed timing. The portion 70b engages with the engaging portion 60b to rotate the trailing blade driving member 60 counterclockwise against the urging force of the urging spring 63, and as shown in FIGS. The set operation to the set position by is completed. In the state where the setting is completed, the leading blade 30 expands to close the opening 10a, and the trailing blade 40 overlaps to open the opening 10a.

Subsequently, when a shutter operation (exposure operation) command is issued by a signal such as a release, the electromagnet 90 is energized, and the iron core member 91 attracts the attracted portions 51c and 60c by the magnetic attractive force, and rotates clockwise. The main drive member 51 and the trailing blade drive member 60 are securely held and positioned at the set position against the urging force of the urging springs (53, 63) that urge the rotation.
Subsequently, as shown in FIG. 8, the set member 70 rotates counterclockwise by the biasing force of the biasing spring 73 and returns to the rest position (of the leading blade driving member 50 and the trailing blade driving member 60). Regulations are lifted.

Thereafter, when the energization of the two electromagnets 90 is cut off at different desired timings, first, the leading blade driving member 50 is rotated clockwise by the biasing force of the biasing spring 53 (the main driving member 51 is biased). The leading blade 30 travels in the clockwise direction by the urging force of the spring 53 and the driven member 55 is pushed by the main driving member 51 and rotates in the clockwise direction. The blade driving member 60 rotates clockwise by the biasing force of the biasing spring 63 and the trailing blade 40 travels. As shown in FIG. 3, the leading blade 30 opens the opening 10a and the trailing blade 40 opens. 10a is closed.
As described above, the opening / closing operation of the opening 10a is performed by the leading blade 30 and the trailing blade 40, and the shutter operation (exposure operation) is completed. When continuous shooting is performed, the charge speed (set speed) by the set member 70 is increased and the above sequence is continuously performed.
Here, an auxiliary mechanism M (a leaf spring 52, a contact portion 56) for assisting the follower drive member 55 to follow when the main drive member 51 moves to the set position when the restriction mechanism 80 is inactive is provided. As a result, the follower drive member 55 reliably follows the main drive member 51 and is set at the set position during the set operation, so that a desired exposure operation can be obtained even if the charge speed by the set member 70 is increased. The frame speed (number of frames) of continuous shooting (continuous shooting) can be increased to enable continuous shooting at high speed.

  On the other hand, in the mode in which the restriction mechanism 80 is activated (the object image before photographing can be observed with the electronic viewfinder), the shutter operation (exposure operation) is completed as shown in FIG. When the restriction mechanism 80 operates (the rotor 81 rotates clockwise) in a state where the opening 10a is opened and the rear blade 40 closes the opening 10a), the restriction 81a becomes the engagement portion 55c of the driven member 55. Is engaged to restrict counterclockwise rotation.

Subsequently, when a shutter operation preparation command is issued in response to a set operation command before the exposure operation, the set member 70 rotates clockwise while resisting the urging force of the urging spring 73 to start the setting operation.
Then, as shown in FIG. 9, the clockwise rotation of the set member 70 causes the engaging portion 70 a to engage the engaging portion 51 b and cause the main drive member 51 to resist the biasing force of the biasing spring 53. While rotating clockwise, the engaging part 70b engages with the engaging part 60b and rotates the trailing blade driving member 60 counterclockwise against the urging force of the urging spring 63.

  At this time, the tip region of the leaf spring 52 provided on the main drive member 51 contacts the contact portion 56 of the slave drive member 55 and contacts the contact portion 56 of the slave drive member 55. Is controlled so as not to move by the restricting mechanism 80, a resistance force of a predetermined level or more is applied, and the leaf spring 52 is elastically deformed and bent so that the tip region thereof is detached from the contact portion 56, and the driven member 55. Is stopped by the restriction mechanism 80 as it is (the leading blade 30 has opened the opening 10a).

Then, the main drive member 51 and the trailing blade drive member 60 are set at the set position against the biasing force of the biasing springs 53 and 63, respectively, and the setting operation by the setting member 70 is completed. In this set completion state, as shown in FIG. 10, the leading blade 30 overlaps to open the opening 10a, and the trailing blade 40 overlaps to open the opening 10a.
In this state, the subject image before photographing can be confirmed using the electronic viewfinder.

Subsequently, when a shutter operation (exposure operation) command is issued by a signal such as a release, the rotor 81 of the restricting mechanism 80 rotates counterclockwise, and the restricting portion 81a is disengaged from the engaging portion 55c to restrict the restriction. Is released (the regulating mechanism 80 is in an inoperative state), and the driven member 55 is rotated counterclockwise by the biasing force of the backlash spring for backlashing the leading blade 30, as shown in FIG. The state follows the drive member 51 and the leading blade 30 expands to close the opening 10a, and the electromagnet 90 is energized, and the iron core member 91 attracts the attracted portions 51c and 60c with a magnetic attractive force. The main drive member 51 and the rear blade drive member 60 are securely held and positioned at the set position against the urging force of the urging springs (53, 63) that are attracted by and urged in a clockwise direction.
Subsequently, as shown in FIG. 8, the set member 70 rotates counterclockwise by the biasing force of the biasing spring 73 and returns to the rest position (of the leading blade driving member 50 and the trailing blade driving member 60). Regulations are lifted.

Thereafter, when the energization of the two electromagnets 90 is cut off at different desired timings, first, the leading blade driving member 50 is rotated clockwise by the biasing force of the biasing spring 53 (the main driving member 51 is biased). The leading blade 30 travels in the clockwise direction by the urging force of the spring 53 and the driven member 55 is pushed by the main driving member 51 and rotates in the clockwise direction. The blade driving member 60 rotates clockwise by the biasing force of the biasing spring 63 and the trailing blade 40 travels. As shown in FIG. 3, the leading blade 30 opens the opening 10a and the trailing blade 40 opens. 10a is closed.
As described above, the opening / closing operation of the opening 10a is performed by the leading blade 30 and the trailing blade 40, and the shutter operation (exposure operation) is completed.

In the above embodiment, the case where the leaf spring 52 as the urging member provided in the main drive member 51 and the contact portion 56 provided in the sub drive member 55 are employed as the auxiliary mechanism M is shown. As long as the main drive member 51 moves to the set position when the restriction mechanism 80 is not in operation, the auxiliary mechanism may take other forms as long as the follower drive member 55 is supported. Can be adopted.
Moreover, although the case where the leaf | plate spring 52 provided in the main drive member 51 was employ | adopted as an urging | biasing member contained in the auxiliary mechanism M was shown, it is not limited to this, The main which moves toward a set position The slave drive member 55 is elastically deformed so as to allow the slave drive member 55 to move relative to the master drive member 51 in a state in which the slave drive member 55 is pressed or pulled toward the drive member 51 to be urged and the regulating mechanism 80 is activated. If possible, a torsion coil spring that urges the driven member 55 counterclockwise to follow the main drive member 51, or is stretched between the main drive member 51 and the driven member 55. A tension spring or the like can also be employed.
In the above-described embodiment, the case where the restriction mechanism 80 including the electromagnetic actuator including the rotor 81, the yoke 82, and the coil 83 is employed as the restriction mechanism is shown. However, the present invention is not limited to this, and other forms are employed. The present invention may be adopted in a configuration provided with a regulating mechanism.

  As described above, the focal plane shutter of the present invention is a focal plane shutter for a camera in which the driving member of the leading blade is composed of two driving members so that the subject image before photographing can be observed using the electronic viewfinder. The desired exposure operation can be obtained even when the charging speed of the set member is increased while achieving simplification of the structure and downsizing of the device, and the frame speed (number of frames) for continuous shooting (continuous shooting) is increased. In addition, in order to enable continuous shooting at high speed, it can be applied to cameras such as digital single-lens cameras and mirrorless cameras, and is also useful for other optical devices having an opening for exposure. is there.

DESCRIPTION OF SYMBOLS 10 Base plate 10a Opening part 10h Support axis S1 Axis 20 Support plate 30 Front blade 40 Rear blade 50 Front blade drive member 51 Main drive member M Auxiliary mechanism 52 Leaf spring (auxiliary mechanism)
53 Biasing spring 55 Subordinate drive member 56 Contact portion (auxiliary mechanism)
60 Rear blade drive member 63 Biasing spring 70 Set member 80 Restricting mechanism 90 Electromagnet

Claims (6)

A ground plane having an opening for exposure;
A leading blade provided movably on the base plate to open and close the opening;
A rear blade provided movably on the base plate to open and close the opening,
A leading blade driving member you drive the leading blade,
A leading blade driving spring for biasing the leading blade driving member;
A blade driving member after you drive the trailing blade,
A rear blade drive spring for biasing the rear blade drive member;
A set member capable of setting the leading blade driving member and the trailing blade driving member at a set position before the shutter operation against the urging force of the leading blade driving spring and the trailing blade driving spring ;
The leading blade driving member includes a main drive member to which the setting member is set to the set position before the shutter operation while resisting the urging force of the leading blade driving spring engages, Ru is connected to the leading blade It includes a sub-drive member,
A set spring for urging the slave drive member to follow the main drive member set at the set position ;
A focal plane shutter further comprising a restriction mechanism that operates to restrict the follow-up of the slave drive member under a predetermined condition during a set operation by the set member;
An auxiliary mechanism for assisting the follower drive member to follow when the main drive member moves to the set position in a state where the restriction mechanism is inoperative.
A focal plane shutter characterized by that. The auxiliary mechanism presses or pulls the slave drive member against the master drive member that moves toward the set position and biases the slave drive member while the restriction mechanism is activated. Including a biasing member that can be elastically deformed to allow relative movement of the member;
The focal plane shutter according to claim 1. The urging member is a leaf spring provided in the main drive member so as to be able to abut on a contact portion provided in the slave drive member and to be elastically deformed and bent with respect to a predetermined or more resistance force.
The focal plane shutter according to claim 2. The main drive member and the slave drive member are arranged so as to rotate around the same axis,
The leaf spring is formed to bend in a plane perpendicular to the axis,
The contact portion is formed to extend in parallel with the axis so as to be in contact with the tip region of the leaf spring.
The focal plane shutter according to claim 3. The tip region of the leaf spring is formed to be curved in a convex shape toward the contact portion,
The contact portion is formed in a cylindrical shape extending in parallel with the axis.
The focal plane shutter according to claim 4. The focal plane shutter according to any one of claims 1 to 5 is provided.
A camera characterized by that.

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