JP6216630B2 - Focal plane shutter and camera - Google Patents

Description

  The present invention relates to a blade member that opens and closes an opening for exposure and a focal plane shutter and a camera having two driving member driving members for driving the blade member, and more particularly to an electronic device such as a digital single-lens camera or a mirrorless camera. The present invention relates to a focal plane shutter and a camera capable of observing a subject image before photographing using a finder.

  As a conventional focal plane shutter, a substantially rectangular base plate having an opening for exposure, a blade member supported movably with respect to the base plate to open and close the opening of the base plate, and set at a set position before the shutter operation. A main drive member (second drive member), a drive spring that urges the main drive member to rotate in the shutter operation direction, and a blade member that is connected to the blade member and is urged to rotate in the opposite direction to the shutter operation by the urging force of the backlash spring. The secondary drive member (first drive member) that follows the main drive member that moves toward the set position and moves together by being pushed by the main drive member during the shutter operation, and resists the urging force of the drive spring. A set member to be set at the set position before the shutter operation, an electromagnet for attracting and holding the main drive member set at the set position, and a part of the main drive member at the end of the shutter operation An annular buffer member that abuts, a C-shaped cushion member that a part of the drive member (drive pin) abuts at the end of the shutter operation, and the like. Then, a part of the driven member (drive pin) is brought into contact with the C-shaped buffer member, and the main drive member is brought into contact with the annular buffer member and bounces (moves in the opposite direction). ) When moving toward the annular cushioning member again, the pushing portion of the driven member that bounces after coming into contact with the C-shaped cushioning member at the pushing portion of the main driving member is forced back. There is known one that reduces the impact (see, for example, Patent Document 1).

  However, in this focal plane shutter, the interval between the timing at which the main drive member abuts on the annular cushioning member and the timing at which the slave drive member abuts on the C-shaped cushioning member is very short, and the main drive member contacts the annular cushioning member. The timing when the pushing portion of the main drive member forcibly pushes back the pushed portion of the slave drive member by using the action toward the annular buffer member after bouncing in contact is set at this very narrow interval. It is not easy, and furthermore, there may be a shift in the initial buffering (contact) timing or the pushing portion pushing back the pushed portion due to environmental temperature changes, deterioration of the buffer member over time, etc. Therefore, there is a possibility that a desired buffer action cannot be sufficiently obtained.

JP 2013-97032 A

  The present invention has been made in view of the above circumstances, and an object thereof is to simplify the structure of a focal plane shutter in which a driving member for driving a blade member is constituted by two driving members. While reducing the size of the device, the impact and vibration when the drive member stops can be mitigated without being affected by temperature change, deterioration over time, etc., and a suitable photographed image can be obtained, and camera shake correction It is an object of the present invention to provide a focal plane shutter capable of shortening the vibration convergence time due to the above and the like and capable of continuous shooting at high speed by shortening the sequence, and a camera using the focal plane shutter.

The focal plane shutter according to the present invention has a base plate having an opening for exposure, a blade member that opens and closes the opening, and is urged in a direction to cause the blade member to perform a shutter operation and operates against the urging force. A main drive member that is set at the previous set position and a main drive member that is connected to the blade member and is set to follow the main drive member that is set at the set position, and is moved by being pushed by the main drive member during the shutter operation. A drive member; a main buffer member that first contacts the main drive member upon completion of the shutter operation; and a secondary buffer member that contacts the secondary drive member after the main drive member contacts the main buffer member. The focal plane shutter is characterized in that a locking mechanism is provided that locks the slave drive member after the slave drive member abuts the slave buffer member to restrict reverse movement.
According to this configuration, the main drive member and the sub drive member are moved from the state in which the main drive member and the sub drive member are set to the set position before the shutter operation while pushing the sub drive member (connected to the blade member). When the blade member completes the shutter operation (when the blade member includes the leading blade and the trailing blade, the leading blade completely opens the opening, and the trailing blade completely opens the opening. First, the main drive member comes into contact with the main buffer member to perform a buffering action, and the slave drive member moves away from the main drive member due to inertia, and then the slave drive member. However, the secondary drive member tries to bounce in the opposite direction, but the engagement mechanism locks the secondary drive member and restricts the reverse movement. The blade member connected to the driven member is also in the reverse direction To move is restricted.
That is, the shock absorbing action of the main driving member by the main shock absorbing member is performed first, followed by the shock reducing action of the slave driving member by the sub shock absorbing member, and further, the bounce preventing action for restricting the reverse movement of the slave driving member. Therefore, the impact can be alleviated stepwise as a whole, and the blade member can be made to perform a desired shutter operation, a suitable photographed image can be obtained, and vibration convergence by hand shake correction or the like can be obtained. Time can be shortened, and high-speed continuous shooting is possible by shortening the sequence.

In the above configuration, the locking mechanism includes a locking lever having a locking portion that detachably locks the driven member, and an urging force of the locking lever in a direction in which the locking portion locks the driven drive member. A configuration including a spring can be employed.
According to this configuration, since the locking lever and the biasing spring that biases in the locking direction are employed as the locking mechanism, the structure can be simplified, the device can be downsized, and the like can be driven. When the member reaches a predetermined position, the locking lever can be automatically locked by the biasing force of the biasing spring.

In the above-described configuration, the locking lever can employ a configuration including a sliding portion on which the driven member slides before the locking portion locks the driven member.
According to this configuration, by providing the sliding portion on the locking lever, the load resistance (frictional force) is generated when the driven member slides on the sliding portion before the locking operation is performed. Due to this load resistance (frictional force), the slave drive member receives a braking action (deceleration action), and the impact when it comes into contact with the secondary shock absorbing member is alleviated.

The above configuration includes a torsion coil type drive spring that urges the main drive member in a direction to cause the blade member to perform a shutter operation. One end of the drive spring is fixedly immovable with respect to the ground plate, and the other end. The drive spring has a free end that is hooked on a part of the main drive member and extends in a predetermined direction, and the free end of the drive spring is attached to a part of the main plate before the main drive member abuts the main buffer member. The structure formed so that it may contact | abut can be employ | adopted.
According to this configuration, when the blade member completes the shutter operation, first, the free end portion of the drive spring comes into contact with a part of the main plate to perform the first buffering action, and then the main drive member is the main drive member. A second buffering action is performed by abutting against the buffer member, and then the slave drive member abuts the slave buffer member to perform the third buffering action, and the slave drive member tries to bounce in the opposite direction. However, since the secondary drive member is locked by the locking mechanism and the reverse movement is restricted, the blade member connected to the secondary drive member is also restricted from moving in the reverse direction.
That is, the impact mitigating action of the main driving member by the drive spring, the impact mitigating action of the main driving member by the main buffer member, and the impact mitigating action of the slave driving member by the secondary buffer member are performed. Since the bounce preventing action for restricting the reverse movement of the drive member is performed, the impact can be effectively reduced as a whole, and the blade member can be caused to perform a desired shutter operation.
Further, since the drive spring for biasing the main drive member is also used for the buffering action, the structure can be simplified and the apparatus can be downsized as compared with the case where a dedicated buffer spring is provided.

In the above configuration, an electromagnetic actuator that exerts a driving force on the locking lever is included, and the electromagnetic actuator is configured to drive the locking lever in a direction to release the locking of the slave driving member. Can do.
According to this configuration, the unlocking operation by the locking lever is performed by the electromagnetic actuator, and therefore the release timing can be easily set as appropriate according to the desired control sequence.

In the above configuration, the main drive member includes a set member that can be set at a set position before the shutter operation against the urging force, and the set member is in a direction to release the locking of the slave drive member during the set operation. The structure formed so that a latching lever may be interlock | cooperated can be employ | adopted.
According to this configuration, in the middle of the setting operation of the set member, since the unlocking operation by the locking lever is performed in conjunction with the set member, the releasing operation can be surely performed at a predetermined timing, By using the set member also as a mechanism for releasing the locking, it is possible to achieve simplification of the structure, downsizing of the apparatus, and the like.

In the above configuration, the blade member includes a front blade that opens the opening and a rear blade that closes the opening during the shutter operation, and includes a main drive member, a sub drive member, a main buffer member, a sub buffer member, and a locking mechanism. Can adopt a configuration provided to correspond to at least one of the leading blade and the trailing blade.
According to this configuration, in the drive mechanism that drives the leading blade or the trailing blade, the shock absorbing mechanism (the main shock absorbing member, the secondary shock absorbing member, the locking mechanism, and the free end portion of the driving spring) is applied, so that the shock is applied. Thus, the desired shutter operation (exposure operation) can be performed on the leading blade and the trailing blade.

In the above configuration, it is possible to adopt a configuration that includes a restriction mechanism that restricts the movement of the driven member to hold the blade member in an open or closed state, and the locking mechanism also serves as the restriction mechanism.
According to this configuration, in a predetermined control sequence, the blade member can be held in the open state in which the opening is opened or in the closed state in which the opening is closed by the restriction mechanism.
For example, when the blade member includes a front blade and a rear blade, when the blade member is the front blade, the subject image before photographing is observed using the electronic viewfinder by holding the front blade in an open state by a restriction mechanism. The normal open mode can be set, and when the blade member is the rear blade, the rear blade is closed by the regulating mechanism, and the shooting information is paralleled with the set operation (charge operation). Can be transferred and stored in the storage unit.
In particular, by using the locking mechanism also as a regulating mechanism, it achieves simplification of the structure, downsizing of the device, etc., and the locking action for preventing bounce and the regulating action for holding the blade member in an open or closed state Can be made compatible.

The camera of the present invention includes a focal plane shutter having any one of the above-described configurations.
According to this configuration, it is possible to obtain a suitable captured image while achieving simplification of the structure, downsizing of the apparatus, etc., and it is possible to shorten the vibration convergence time due to camera shake correction and the like, and to achieve high speed by shortening the sequence. Can be obtained.

  According to the focal plane shutter having the above-described configuration, in the focal plane shutter in which the driving member that drives the blade member is configured by two driving members, while achieving simplification of the structure, downsizing of the apparatus, etc., the temperature change, The impact and vibration when the drive member stops without being affected by deterioration over time, etc. can be mitigated, a suitable photographed image can be obtained, the vibration convergence time due to camera shake correction etc. can be shortened, and the sequence can be shortened It is possible to provide a focal plane shutter and a camera using the same that can perform continuous high-speed shooting.

It is a front view which shows one Embodiment of the focal plane shutter which concerns on this invention. FIG. 2 is an external perspective view of the focal plane shutter shown in FIG. 1 (a support plate and the like are omitted). FIG. 3 is a partially enlarged perspective view in which a part of the focal plane shutter shown in FIG. 2 is enlarged. FIG. 3 is a partially enlarged perspective view in which a part of the focal plane shutter shown in FIG. 2 is enlarged. In the focal plane shutter shown in FIG. 1, it is a partial front view showing a state in which a support plate and the like are omitted and a blade member (front blade and rear blade) has completed a shutter operation (exposure operation). In the focal plane shutter shown in FIG. 5, the set member starts the set operation (charge operation) in a counterclockwise direction with the driven members that drive the leading blade and the trailing blade locked by the locking lever. It is a partial front view which shows the state in the middle of the set rotated slightly. In the focal plane shutter shown in FIG. 6, the set member further rotates, interlocking with the set operation (charging operation), the locking of the driven member by the locking lever is released, and the rear blade partially opens the opening. It is a partial front view which shows the state open | released. FIG. 8 is a partial front view showing a state where the setting member further rotates to complete the setting operation (charging operation) and the leading blade and the trailing blade open the opening (normally open) in the focal plane shutter shown in FIG. 7. . In the focal plane shutter shown in FIG. 8, the locking by the locking lever of the driven member that drives the leading blade is released, and the leading blade is moved by the biasing force of the backlash spring to partially close the opening. It is a partial front view which shows a state. In the focal plane shutter shown in FIG. 9, the shutter operation is such that the leading blade completely closes the opening, the set member is returned to the rest position, and the main driving member that drives the leading blade and the trailing blade is attracted and held by the electromagnet, respectively. It is a partial front view which shows the state before a start (before exposure operation start). In the focal plane shutter shown in FIG. 10, the main drive member that drives the leading blade is released from being attracted and held by the electromagnet, and the main driving member rotates while pushing the driven member by the biasing force of the driving spring, and the leading blade is the shutter. It is a partial front view which shows the state which started operation | movement and open | releases an opening part partially and a sub drive member slides the sliding part of a latching lever. In the focal plane shutter shown in FIG. 11, the main drive member and the sub drive member that drive the leading blade further rotate, and the free end portion of the drive spring that urges the main drive member is in contact with a part of the main plate. FIG. In the focal plane shutter shown in FIG. 12, the main driving member and the sub driving member that drive the leading blade further rotate, the leading blade completely opens the opening, and the main driving member is in contact with the main cushioning member. FIG. In the focal plane shutter shown in FIG. 13, it is a partial front view which shows the state which the sub drive member which drives a front blade | wing further rotates by inertia, and contact | abutted to the sub buffer member. In the focal plane shutter shown in FIG. 14, after the driven member that drives the leading blade comes into contact with the driven buffer member, the locking portion of the locking lever locks the driven member to restrict the reverse movement. It is a partial front view which shows a state. In the focal plane shutter shown in FIG. 15, the main drive member that drives the rear blade is released from being attracted and held by the electromagnet, and the main drive member rotates while pushing the driven member by the biasing force of the drive spring, and the rear blade is the shutter. It is a partial front view which shows the state which started operation | movement and closed an opening part partially and a sub drive member slides the sliding part of a latching lever. In the focal plane shutter shown in FIG. 16, the main drive member and the sub drive member that drive the rear blade further rotate, and the free end of the drive spring that biases the main drive member is in contact with a part of the main plate. FIG. In the focal plane shutter shown in FIG. 17, the main drive member and the sub drive member that drive the rear blade further rotate, the rear blade completely closes the opening, and the main drive member of the rear blade contacts the main buffer member. It is a partial front view which shows the state which contact | connected. FIG. 19 is a partial front view showing the focal plane shutter shown in FIG. 18 in a state where the secondary drive member is further rotated by inertia and is in contact with the secondary buffer member. In the focal plane shutter shown in FIG. 5, the set member in a state where the locking of the driven member that drives the leading blade is released by the locking lever and the driven member that drives the trailing blade is locked by the locking lever. FIG. 7 is a partial front view showing a state in the middle of the set operation that has started the set operation (charge operation at the time of normal close) and rotated counterclockwise. In the focal plane shutter shown in FIG. 20, the set member is further rotated and interlocked with the set member, the locking of the driven member for driving the rear blade is released, and the rear blade completely opens the opening. It is a partial front view which shows the state open | released. FIG. 9 shows another embodiment of the focal plane shutter according to the present invention (in the drive spring for urging the main drive member, the free end abutting against a part of the main plate is abolished), and the main blade driving the leading blade is shown. FIG. 6 is a partial front view showing a state in which the driving member and the secondary driving member rotate, the leading blade completely opens the opening, and the main driving member first contacts the main buffer member.

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 serving as the blade member, the leading blade driving mechanism 50 (the main driving member 51, the secondary driving member 52, and the driving spring 53) that drives the leading blade 30, and the trailing blade driving that drives the trailing blade 40. Mechanism 60 (main drive member 61, sub drive member 62, drive spring 63), set member 70 that can set (charge) the main drive members 51, 61 at the set position before the shutter operation while resisting the urging force, main drive The main buffer members 81 and 82 for contacting the members 51 and 61, the secondary buffer members 91 and 92 for contacting the secondary drive members 52 and 62, and the secondary drive member 52 are locked to restrict reverse movement. Mechanism 10 (Locking lever 101, biasing spring 102, electromagnetic actuator 103), locking mechanism 110 (locking lever 111, biasing spring 112, set member 70) that locks the driven member 62 and restricts reverse movement. Engaging portion 73 for release provided on the main drive members 51 and 61 (the attracted portions 51c and 61c of the main drive members 51 and 61c) at the set position, respectively.
The base plate 10 is an intermediate plate that defines a blade chamber that houses the leading blade 30 on the side opposite to the front side (back side) where the leading blade driving mechanism 50, the trailing blade driving mechanism 60, the set member 70, and the like are disposed. (Not shown) and a back plate 11 that defines a blade chamber that houses the rear blade 40 are fixed at a predetermined interval.

  As shown in FIGS. 1 and 2, the base plate 10 is formed in a substantially rectangular flat plate shape using a resin material or the like, and includes 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 (back side) to support the blade 30 in a rotatable manner, and support shafts 10f provided upright on the blade chamber side in order to support the rear blade 40 in a rotatable manner. 10g, pivot 10h, main drive member 61 and slave drive member 62 standing on the front side (opposite to the blade chamber side) to pivotally support the main drive member 51 and the slave drive member 52 A support shaft 10i erected on the front side to freely support, a support shaft 10j erected on the front side to rotatably support the set member 70, and free ends 53b and 63b of the drive springs 53 and 63. Abutting portions 10k, 10m erected on the front side so as to abut each other, Shaft 10n which supports the locking lever 101 and 111 rotatably provided with 10p, a plurality of the fixing portions 10r or the like which is erected on the front side in order to fix the support plate 20.

  As shown in FIG. 1, 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 a support portion 21 that supports one end side of the support shafts 10 h, 10 i, 10 j A plurality of ratchet claws 22 for fixing adjusting wheels 53c and 63c for engaging one end sides 53a and 63a of springs 53 and 63, a holding part 23 for holding two electromagnets 120, and a plurality of parts fixed to the fixing part 10r of the base plate 10 by screws. Fixed portion 24 and the like.

The leading blade 30 moves along the main plate 10 and connects the four blade bodies 31, 32, 33, 34 and the blade bodies 31, 32, 33, 34 as shown in FIGS. It consists of two arms 35 and 36.
The arm 35 is rotatably supported by the support shaft 10 d, and a part of the arm 35 is connected to the drive pin 52 a of the slave drive member 52.
The arm 36 is rotatably supported by the support shaft 10e.
The leading blade 30 is urged to rotate clockwise by a backlash spring 37 such as a torsion coil spring or a tension spring (provided between the arm 35 or 36 and the base plate 10). 1, the four blade bodies 31, 32, 33, and 34 overlap each other by being driven upward (counterclockwise) by the main drive member 51 and the sub drive member 52, thereby opening the opening 10 a. On the other hand, as shown in FIG. 10, the four blade bodies 31, 32, 33, 34 are developed by being driven downward (clockwise) by the main drive member 51 and the sub drive member 52. Thus, the opening 10a is closed.

The rear blade 40 moves along the main plate 10, and connects the four blade bodies 41, 42, 43, 44 and the blade bodies 41, 42, 43, 44 as shown in FIGS. It consists of two arms 45 and 46 that perform.
The arm 45 is rotatably supported by the support shaft 10 f and a part thereof is connected to the drive pin 62 a of the slave drive member 62.
The arm 46 is rotatably supported by the support shaft 10g.
The rear blade 40 is urged to rotate clockwise by a backlash spring 47 such as a torsion coil spring or a tension spring (provided between the arm 45 or 46 and the main plate 10). As shown in FIG. 1 and FIG. 8, the four blade bodies 41, 42, 43, 44 overlap each other by being driven downward (clockwise) by the main drive member 61 and the sub drive member 62. On the other hand, the four blade bodies 41, 42, 43, 10a are opened by being driven upward (counterclockwise) by the main drive member 61 and the sub drive member 62, as shown in FIG. 44 expands to close the opening 10a.

As shown in FIGS. 1, 2, and 3, the main drive member 51 is engaged with an engagement portion 51 a that engages with the slave drive member 52 and a set member 70, and a rotational force is exerted clockwise. 51b, a portion 51c to be attracted by the electromagnet 120, a contact portion 51d that contacts the main buffer member 81, a latching portion 51e that latches the base region of the free end 53b of the drive spring 53, and the like. .
The main drive member 51 is supported so as to be rotatable around the support shaft 10h with respect to the base plate 10, and the counterclockwise operation is performed while pushing the slave drive member 52 via the engaging portion 51a by the rotational biasing force of the drive spring 53. The contact portion 51d is in contact with the main buffer member 81.

As shown in FIGS. 1, 2, and 3, the sub drive member 52 is inserted into the long hole 10 b and connected to the arm 35. The sub drive member 52 removably contacts the sub buffer member 91 and the main drive lever. 51, an engaging portion 52b that releasably engages with the engaging portion 51a, an engaging portion 52c that releasably engages (locks) the locking portion 101a of the locking lever 101, and the like.
The driven member 52 is supported by the base plate 10 so as to be rotatable about the support shaft 10h, and is urged to rotate clockwise by a rattling spring 37 that rattles the leading blade 30 to rotate clockwise. After following the main drive member 51 and rotating counterclockwise while being pushed by the main drive member 51 via the engaging portion 52b, the contact portion 51d of the main drive member 51 contacts the main buffer member 81. The drive pin 52a comes into contact with the secondary buffer member 91, and then the engaging portion 52c is locked by the locking portion 101a of the locking lever 101 so that the reverse movement is restricted.

The drive spring 53 is a torsion coil type spring, and is disposed around the support shaft 10h as shown in FIGS. 1 and 3, and one end side 53a is disposed so as to be rotatable around the support shaft 10h. It is hooked to an adjustment wheel (ratchet cylinder) 53c that is positioned by the plate 20 (the ratchet pawl 22) (that is, one end side 53a is fixedly fixed to the main plate 10), and the other end side is the main drive member 51. The main drive lever 51 is formed to have a free end 53b that is releasably hooked on the hook 51e and extends in a direction parallel to the main plate 10, and urges the main drive lever 51 to rotate counterclockwise in FIG. It is designed to exert an energizing force.
The free end portion 53b is formed so as to be detachably contacted with the contact portion 10k of the base plate 10, and immediately before completion of the shutter operation (immediately before the leading blade 30 fully opens the opening portion 10a), that is, the contact of the main drive member 51. Before the portion 51d abuts on the main buffer member 81, it abuts on the abutting portion 10k to relieve the impact and brake the main driving member 51 while winding up the driving spring 53.
Here, the (counterclockwise rotation) biasing force of the drive spring 53 is set to be larger than the (clockwise rotation) biasing force of the backlash spring 36 that loosens the leading blade 30.

As shown in FIGS. 1, 2, and 3, the main drive member 61 is engaged with an engagement portion 61 a that engages with the slave drive member 62 and a set member 70, and a rotational force is exerted clockwise. 61b, a portion 61c to be attracted by the electromagnet 120, a contact portion 61d that contacts the main buffer member 82, a hook portion 61e that hooks the base region of the free end 63b of the drive spring 63, and the like. .
The main drive member 61 is supported so as to be rotatable about the support shaft 10i with respect to the base plate 10, and is rotated counterclockwise while pushing the slave drive member 62 via the engaging portion 61a by the rotational biasing force of the drive spring 63. The contact portion 61d contacts the main buffer member 82 by rotating around.

1, 2, and 3, the sub drive member 62 is inserted into the long hole 10 c and connected to the arm 45, and the sub drive member 62 removably contacts the sub buffer member 92 and the main drive lever. An engaging portion 62b that releasably engages with the engaging portion 61a of 61, an engaging portion 62c that releasably engages (locks) with the engaging portion 111a of the locking lever 111, and the like.
The driven member 62 is rotatably supported around the support shaft 10i with respect to the base plate 10, and is urged to rotate clockwise by a backlash spring 47 that backlashes the rear blade 40, and rotates clockwise. After following the main drive member 61 and rotating counterclockwise while being pushed by the main drive member 61 via the engaging portion 62b, the contact portion 61d of the main drive member 61 contacts the main buffer member 82. The drive pin 62a comes into contact with the secondary buffer member 92, and then the engaging portion 62c is locked by the locking portion 111a of the locking lever 111 so that the reverse movement is restricted.

The drive spring 63 is a torsion coil type spring, and is disposed around the support shaft 10i as shown in FIGS. 1 and 3, and one end side 63a is disposed so as to be rotatable about the support shaft 10i. It is hooked to an adjustment wheel (ratchet cylinder) 63c that is positioned by the plate 20 (the ratchet pawl 22) (that is, one end side 63a is fixedly fixed to the main plate 10), and the other end side is the main drive member 61. The main drive lever 61 is formed to have a free end 63b that is releasably hooked to the hook 61e and extends in a direction parallel to the main plate 10, and urges the main drive lever 61 to rotate counterclockwise in FIG. It is designed to exert an energizing force.
The free end portion 63b is formed so as to removably contact the contact portion 10m of the base plate 10, and immediately before completion of the shutter operation (immediately before the rear blade 40 fully closes the opening portion 10a), that is, the contact of the main drive member 61. Before the contact portion 61d comes into contact with the main buffer member 82, the contact portion 10d comes into contact with the contact portion 10m to relieve the impact while winding the drive spring 63 and to brake the main drive member 61.
Here, the (counterclockwise rotation) biasing force of the drive spring 63 is set to be larger than the (clockwise rotation) biasing force of the backlash spring 46 that rattles the rear blade 40.

As shown in FIGS. 1 to 4 and 7, the set member 70 engages with an engagement portion 71 that can engage with an engagement portion 51 b of the main drive member 51 and an engagement portion 61 b of the main drive member 61. An engaging portion 72, an engaging portion 73 that engages with the locking lever 111 and rotates in the unlocking direction, and the like, and is rotatably supported by the support shaft 10j of the main plate 10 and attached. By the urging force of the urging spring 74, it is urged to rotate clockwise toward the rest position.
Then, the set member 70 moves away from the rest position (shutter operation completion (exposure operation completion) state) shown in FIG. 5 against the urging force of the urging spring 74 by a driving force exerted by a driving mechanism (not shown). When rotating clockwise, the engaging portion 71 exerts a rotating force on the engaging portion 51b and the engaging portion 72 exerts a rotating force on the engaging portion 61b, and as shown in FIG. Is rotated clockwise while resisting the rotational biasing force of the drive springs 53 and 63, and is set to the set position before the shutter operation, and during the setting operation, as shown in FIG. In addition, the engaging portion 73 engages with the locking lever 111 and rotates the engaging lever 111 clockwise to release the locking of the slave driving member 62, while the main driving members 51, 61 are set at the set position. (To-be-adsorbed part 51c, 6 When the c) is attracted and held by the electromagnet 120 and rotated clockwise by the biasing force of the biasing spring 74 to return to the rest position, as shown in FIG. The engagement portion 72 is detached from the engagement portion 61b, and the main drive members 51 and 61 are allowed to rotate counterclockwise.

As shown in FIGS. 1, 3, and 4, the main buffer members 81 and 82 are formed in a substantially cubic shape using a rubber material, and are fixed to a portion protruding from the main plate 10 to the front side. The contact portions 51d and 61d of the drive members 51 and 61 are detachably contacted.
Then, when the leading blade 30 completes the shutter operation (operation to open the opening 10a), the main buffer member 81 reduces the impact by bringing the contact portion 51d of the main drive member 51 into contact with the main buffer member 81. When the rear blade 40 completes the shutter operation (operation for closing the opening 10a), the member 82 makes the contact portion 61d of the main drive member 61 contact to relieve the impact.

As shown in FIGS. 1, 3, and 4, the secondary buffer members 91 and 92 are formed in a substantially C shape using a rubber material, and are fixed to the ends of the long holes 10 b and 10 c of the base plate 10. The drive pins 52a and 62a of the slave drive members 52 and 62 are detachably contacted.
The secondary buffer member 91 continues after the contact portion 51d of the main drive member 51 contacts the main buffer member 81 when the leading blade 30 completes the shutter operation (operation to open the opening 10a). Then, the drive pin 52a of the secondary drive member 52 is brought into contact with the secondary drive member 52 to reduce the impact, and the secondary shock absorbing member 92 causes the primary drive member 61 when the rear blade 40 completes the shutter operation (operation for closing the opening 10a). After the abutting portion 61d abuts on the main buffer member 82, the drive pin 62a of the slave drive member 62 is abutted to reduce the impact.

The locking mechanism 100 is provided corresponding to the leading blade driving mechanism 50, and locks the slave drive member 52 after the slave drive member 52 abuts the slave buffer member 91 to restrict reverse movement. 1 and 3, a locking lever 101 rotatably supported on the support shaft 10 n of the base plate 10, a biasing spring 102 that rotationally biases the locking lever 101 in a direction to lock the locking lever 101, An electromagnetic actuator 103 for releasing the locking of the locking lever 101 is provided.
The locking lever 101 includes a locking portion 101a that detachably locks the engaging portion 52c of the driven member 52, and the engagement of the driven member 52 before the locking portion 101a locks the engaging portion 52c. The sliding portion 101b exerting a braking action by sliding the side surface 52c ′) of the portion 52c, the U-shaped connecting portion 101c to which the rotor 103a (the connecting pin 103a ′ thereof) included in the electromagnetic actuator 103 is connected, and the like. I have.
The urging spring 102 has one end hooked to the base plate and the other end hooked to the locking lever 101 to rotate the locking lever 101 counterclockwise (the locking portion 101a engages the engaging portion 52c. Rotating bias is applied (to the locking position where it can be stopped).
As shown in FIGS. 1 to 3, the electromagnetic actuator 103 is held by the base plate 10 or the support plate 20 and has a rotor 103a having a connecting pin 103a ′ connected to the connecting portion 101c of the locking lever 101, substantially U A letter-shaped yoke 103b, an exciting coil 103c, and the like are provided. Then, the electromagnetic actuator 103 rotates the rotor 103a clockwise by energizing the coil 103c to release the locking of the driven member 52, and rotates the locking lever 101 clockwise. Yes.
Further, the locking mechanism 100 maintains the locking state even when the setting operation is performed by the setting member 70 after the shutter operation is completed, and restricts the movement of the driven member 52, so that the leading blade 30 is set when the setting is completed. It also functions as a restricting mechanism that keeps in an open state (normally open).
That is, by holding the leading blade 30 in the open state by the locking mechanism 100, it is possible to set a normally open mode in which the subject image before photographing can be observed using the electronic viewfinder. As a regulating mechanism, it is possible to achieve both a locking action for preventing bouncing and a regulating action for holding the leading blade 30 in an open state while achieving simplification of the structure, downsizing of the apparatus, and the like. .

The locking mechanism 110 is provided corresponding to the rear blade driving mechanism 60, and locks the slave driving member 62 after the slave driving member 62 abuts the slave buffer member 92 to restrict reverse movement. 1, 6, and 7, a locking lever 111 that is rotatably supported by the support shaft 10 p of the main plate 10, and a bias that rotates and biases the locking lever 111 in a direction to lock the locking lever 111. A spring 112 and the like are provided.
The locking lever 111 includes a locking portion 111a that releasably locks the engaging portion 62c of the driven member 62, and the engagement of the driven member 62 before the locking portion 111a locks the engaging portion 62c. The sliding part 111b exerts a braking action by sliding the side face 62c ′) of the part 62c, the engaging part 111c that the engaging part 73 of the set member 70 is detachably engaged, and the like.
The urging spring 112 has one end hooked to the ground plate, the other end hooked to the locking lever 111, and the locking lever 111 counterclockwise (the locking portion 111a engages the engaging portion 62c. Rotating bias is applied (to the locking position where it can be stopped).
Further, when the set member 70 performs the setting operation, the locking mechanism 110 maintains the locked state in the middle region of the setting operation (from the start to the middle of the setting operation) and moves the driven member 62. By restricting, it functions also as a restricting mechanism that holds the rear blade 40 in a closed state for a predetermined interval during the setting operation.
That is, by holding the rear blade 40 in the closed state by the locking mechanism 110, the shooting information can be transferred and stored in the storage unit in parallel with the setting operation (charging operation), and the locking mechanism 110 is regulated. By using it also as a mechanism, it is possible to achieve both a locking action for preventing bounce and a regulating action for holding the rear blade 40 in a closed state while achieving simplification of the structure and size reduction of the apparatus.

As shown in FIGS. 1 and 2, the two electromagnets 120 are held by the holding portion 23 of the support plate 20, and are wound around a bobbin around the iron core member 121 having a predetermined length and the iron core member 121. The rotating coil 122 is used for excitation. In FIG. 2, the coil 122 is omitted.
Then, when the coil 122 is energized, magnetic lines of force passing through the iron core member 121 are generated, and as shown in FIG. 8, iron cores are applied to the attracted portions 51c and 61c of the main drive members 51 and 61 set at the set positions. The member 121 opposes and exerts a magnetic attraction force to hold the main drive members 51 and 61 in the set position against the rotational biasing force of the drive springs 53 and 63, while cutting off the energization of the coil 122. The main drive members 51 and 61 are allowed to rotate counterclockwise by the rotational biasing force of the drive springs 53 and 63, respectively.

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 FIG. 5, the set member 70 is rotated clockwise by the biasing force of the biasing spring 74 and is positioned at the rest position. The main drive member 51 and the sub drive member 52 that drive the blades 30 are rotated counterclockwise by the rotational biasing force of the drive spring 53, and the free end portion 53b of the drive spring 53 is in contact with the contact portion 10k. The contact portion 51d of the member 51 contacts the main buffer member 81, the driven member 52 is locked by the locking lever 101, the leading blade 30 is positioned at a position where the opening 10a is opened, and the trailing blade. The main drive member 61 and the sub drive member 62 that drive the motor 40 are rotated and stopped counterclockwise by the rotational biasing force of the drive spring 63, and the free end 63b of the drive spring 63 is in contact with the contact portion 10m. Contact portion 61 of main drive member 61 Is mainly cushioning member 82 abuts, the sub-drive member 62 is locked by the locking lever 111, the trailing blade 40 is located at a position closing the opening 10a.

Here, in the mode in which the subject image before photographing can be observed with the electronic viewfinder (normal open) mode, the exposure mechanism 52 (the locking lever 101) locks the driven member 52 before the exposure operation. When a shutter operation preparation command is issued in response to the set operation command, the set member 70 rotates counterclockwise against the biasing force of the biasing spring 74 and starts the set operation as shown in FIG. Then, the main drive members 51 and 61 begin to rotate clockwise toward the set position while resisting the biasing force of the drive springs 53 and 63.
Then, as shown in FIG. 7, when the set member 70 rotates a predetermined angle counterclockwise, the engaging portion 73 engages with the engaging portion 111c to rotate the locking lever 111 clockwise, The locking of the driven member 62 by the portion 111a is released, the driven member 62 rotates clockwise by the biasing force of the backlash spring 46, the rear blade 40 begins to open the opening 10a, and the set member 70 When the set operation (charge operation) is completed by further rotating counterclockwise, the rear blades 40 overlap to open the opening 10a as shown in FIG.
In this state, the subject image before photographing can be confirmed using the electronic viewfinder. Further, during the period from when the setting operation by the setting member 70 is started until the locking by the locking mechanism 110 is released (while the rear blade 40 closes the opening 10a), that is, the setting operation (charging) In parallel with the operation, the photographing information can be transferred and stored in the storage unit.

Subsequently, when a shutter operation (exposure operation) command is issued by a signal such as a release, the electromagnetic actuator 103 of the locking mechanism 100 is activated (the rotor 103a rotates clockwise) as shown in FIG. The locking portion 101a is released from the engaging portion 52c to release the locking (regulation), and the driven member 52 is rotated clockwise by the biasing force of the backlash spring 36, as shown in FIG. The blade | wing 30 expand | deploys and closes the opening part 10a.
Subsequently, the electromagnet 120 is energized, and the iron core member 121 attracts the attracted portions 51c and 61c with a magnetic attractive force, and resists the biasing force of the drive springs 53 and 63 that rotate counterclockwise. The main drive members 51 and 61 are securely held and positioned at the set position, and the set member 70 is rotated clockwise by the biasing force of the biasing spring 74 to return to the rest position. Restrictions are lifted.
Thereafter, the energization of the two electromagnets 120 is cut off at different desired timings, and a shutter operation (exposure operation) is performed in which the leading blade 30 opens the opening 10a and the trailing blade 40 closes the opening 10a.

  First, the operation of the leading blade driving mechanism 50 and the leading blade 30 when the energization of the electromagnet 120 corresponding to the leading blade driving mechanism 50 is cut off will be described as shown in FIG. The main drive member 51 rotates counterclockwise while pushing the driven member 52 by the urging force of the drive spring 53, the leading blade 30 travels and begins to open the opening 10a, as shown in FIG. Immediately before (a little before) the front blade 30 fully opens the opening 10a, the free end 53b of the drive spring 53 comes into contact with the contact 10k. Apply braking force (first buffering action).

Subsequently, as shown in FIG. 13, when the main drive member 51 and the sub drive member 52 further rotate counterclockwise and the leading blade 30 fully opens the opening 10a, the engaging portion 51d of the main drive member 51 is A buffering action is performed by contacting the main buffer member 81 (second buffering action), and then, as shown in FIG. 14, the counter drive member 52 is further counterclockwise so that it is separated from the main drive member 51 by inertia. When rotating around, the drive pin 52a of the slave drive member 52 abuts on the slave buffer member 91 to perform a buffer action (third buffer action).
Further, as shown in FIGS. 11 to 12, the side surface 52 c ′ of the engaging portion 52 c slides on the sliding portion 101 b of the locking lever 101 in the process in which the driven member 52 rotates counterclockwise. Thus, the driven member 52 is subjected to a braking action (deceleration action) from the locking lever 101.
The locking lever 101 is rotated counterclockwise by the biasing force of the biasing spring 102 when the side surface 52c ′ of the engagement portion 52 of the driven member 52 is disengaged from the sliding portion 101b. Is positioned.
Subsequently, when the drive pin 52a comes into contact with the secondary buffer member 91, the secondary drive member 52 tries to move (bound) in the opposite direction. However, as shown in FIG. The locking portion 101a of the locking lever 101 (of the locking mechanism 100) locks the engaging portion 52c and the reverse movement is restricted, and the leading blade 30 connected to the driven member 52 via the drive pin 52a. Is also restricted from moving in the opposite direction (bounce prevention action).

  Next, the operation of the rear blade drive mechanism 60 and the rear blade 40 when the energization of the electromagnet 120 corresponding to the rear blade drive mechanism 60 is cut off will be described as shown in FIG. Further, the main drive member 61 rotates counterclockwise while pushing the driven drive member 62 by the urging force of the drive spring 63, and the rear blade 40 starts running to close the opening 10a, as shown in FIG. Immediately before (a little before) the rear blade 40 fully closes the opening 10a, the free end 63b of the drive spring 63 abuts against the abutment 10m, and the main drive member relieves the impact while winding up the drive spring 63. A braking force is applied to 61 (first buffering action).

Subsequently, as shown in FIG. 18, when the main drive member 61 and the sub drive member 62 further rotate counterclockwise and the rear blade 40 fully closes the opening 10a, the engaging portion 61d of the main drive member 61 is provided. Is brought into contact with the main buffer member 82 to perform a buffering action (second buffering action). Subsequently, as shown in FIG. 19, the driven member 62 is further counteracted so as to be separated from the main driving member 61 by inertia. When rotated clockwise, the drive pin 62a of the slave drive member 62 comes into contact with the slave buffer member 92 to perform a buffer action (third buffer action).
Further, as shown in FIGS. 16 to 18, the side surface 62 c ′ of the engaging portion 62 c slides on the sliding portion 111 b of the locking lever 111 in the process in which the driven member 62 rotates counterclockwise. Thus, the driven member 62 is subjected to a braking action (deceleration action) from the locking lever 111.
Note that the locking lever 111 rotates counterclockwise by the biasing force of the biasing spring 112 when the side surface 62c ′ of the engagement portion 62 of the driven member 62 is disengaged from the sliding portion 111b. Is positioned.
Subsequently, when the drive pin 62a comes into contact with the secondary buffer member 92, the secondary drive member 62 tries to move (bound) in the opposite direction. However, as shown in FIG. The rear blade 40 connected to the driven member 62 via the drive pin 62a is controlled by the locking portion 111a of the locking lever 111 (of the locking mechanism 110) to lock the engaging portion 62c. Is also restricted from moving in the opposite direction (bounce prevention action).

On the other hand, in the case where the subject image before photographing is not observed with the electronic viewfinder (normally closed) mode, the shutter operation (exposure operation) shown in FIG. 5 is completed (the leading blade 30 opens the opening 10a and the trailing blade 40). When the shutter operation preparation command is issued in response to the set operation command before the exposure operation from the state in which the opening 10a is closed), the electromagnetic actuator 103 of the locking mechanism 100 is activated as shown in FIG. The rotor 103a rotates clockwise), and the locking portion 101a is released from the locking portion 52c to release the locking (regulation), and the set member 70 counterclockwise while resisting the biasing force of the biasing spring 74 The main drive member 51 resists the biasing force of the drive spring 53 (and the slave drive member 52 follows the main drive member 51 by the biasing force of the backlash spring 36). It rotates clockwise toward the set position, the leading blade 30 also expands and begins to close the opening 10a, and the main drive member 61 rotates clockwise toward the set position against the biasing force of the drive spring 63 Begin to.
Then, as shown in FIG. 21, when the set member 70 rotates counterclockwise by a predetermined angle, the engaging portion 73 engages with the engaging portion 111c to rotate the locking lever 111 clockwise. The locking of the driven member 62 by the portion 111a is released, the driven member 62 rotates clockwise by the biasing force of the backlash spring 46, the rear blade 40 begins to open the opening 10a, and the set member 70 When the set operation (charge operation) is completed by further rotating counterclockwise, the leading blade 30 expands to completely close the opening 10a and the trailing blade 40 overlaps as shown in FIG. The opening 10a is opened.
Since the subsequent operation is the same as the contents shown in FIGS. 11 to 19, the description thereof is omitted here.

According to the focal plane shutter having the above-described configuration, when the blade members (the leading blade 30 and the trailing blade 40) complete the shutter operation, first, the free ends 53b and 63b of the drive springs 53 and 63 are connected to the base plate 10. The first buffering action is performed by contacting the part (contacting part 10k, 10m), and then the second driving action is performed by the main drive members 51, 61 contacting the main buffering members 81, 82, Subsequently, the secondary driving members 52 and 62 abut against the secondary buffer members 91 and 92 to perform the buffering action of the third surface, and the secondary driving members 52 and 62 are locked by the locking mechanisms 100 and 110 to be reversed. Since the movement in the direction is restricted, the blade members (the leading blade 30 and the trailing blade 40) connected to the driven members 52 and 62 are also restricted from moving in the opposite direction.
That is, the impact mitigating action of the main drive members 51 and 61 by the drive springs 53 and 63, the impact mitigating action of the main drive members 51 and 61 by the main buffer members 81 and 82, and the slave drive members 52 and 62 by the slave buffer members 91 and 92. Since the impact mitigating action is performed in three stages of the impact mitigating action, and the bounce preventing action of the driven members 52 and 62 is performed by the locking mechanisms 100 and 110, the focal plane shutter having the above-described configuration is mounted on the camera. In this case, the impact can be gradually reduced as a whole, and the blade member (the leading blade 30 and the trailing blade 40) can perform a desired shutter operation, and a suitable photographed image can be obtained. In addition, the vibration convergence time due to camera shake correction or the like can be shortened, and high-speed continuous shooting can be performed by shortening the sequence. Further, since the drive springs 53 and 63 for urging the main drive members 51 and 61 are also used for buffering action, the structure is simplified and the apparatus is downsized compared to the case where a dedicated buffer spring is provided. Can be achieved.

FIG. 22 shows another embodiment of the focal plane shutter according to the present invention, which is the same as the above-described embodiment except that the free ends 53b and 63b of the drive springs 53 and 63 are eliminated. The same reference numerals are assigned to the configurations of and the description is omitted.
That is, in this embodiment, as shown in FIG. 22, in the drive springs 53 and 63 that urge the main drive members 51 and 61 counterclockwise, respectively, the drive springs 53 are obtained by cutting the free ends 53b and 63b. 'And 63' are adopted so that the buffering action and the braking action by the free end portions 53b and 63b are not added.

  According to this embodiment, the main drive members 51 and 61 push the slave drive members 52 and 62 while the main drive members 51 and 61 and the slave drive members 52 and 62 are set at the set positions before the shutter operation. When the leading blade 30 and the trailing blade 40 perform the shutter operation by moving, when the leading blade 30 and the trailing blade 40 complete the shutter operation (the leading blade 30 completely opens the opening 10a, First, the main drive members 51 and 61 come into contact with the main buffer members 81 and 82 to perform a buffering action, and the sub drive members 52 and 62 are mainly driven by inertia. After moving away from the drive members 51 and 62, the secondary drive members 52 and 62 come into contact with the secondary buffer members 91 and 92 to perform a buffering action, so that the secondary drive members 52 and 62 are bound in the opposite direction. But Since the mechanisms 100 and 110 lock the slave drive members 52 and 62 to restrict the reverse movement, the leading blade 30 and the trailing blade 40 connected to the slave drive members 52 and 62 also move in the reverse direction. Is regulated.

  Thus, first, the shock absorbing action of the main driving members 51, 61 by the main shock absorbing members 81, 82 is performed, and then the shock reducing action of the slave driving members 52, 62 by the secondary shock absorbing members 91, 92 is performed. Since the bounce prevention action that restricts the reverse movement of the driven members 52 and 62 by the locking mechanisms 100 and 110 is performed, when this focal plane shutter is mounted on the camera, the impact is gradually reduced as a whole. In addition, the front blade 30 and the rear blade 40 can perform a desired shutter operation, a suitable photographed image can be obtained, and the vibration convergence time due to camera shake correction can be shortened, and the sequence can be shortened. Enables continuous shooting at high speed.

In the above embodiment, the case where the locking mechanisms 100 and 110 including the locking levers 101 and 111 and the urging springs 102 and 112 are employed as the locking mechanism is shown, but the present invention is not limited to this. Other configurations may be adopted as long as the driven members 52 and 62 can be engaged with the driven buffer members 91 and 92 and the driven members 52 and 62 can be locked to restrict the reverse movement. it can.
In the above-described embodiment, the case where the electromagnetic actuator 103 is employed as a method for releasing the locking by the locking lever 111 of the locking mechanism 110 has been described. However, the present invention is not limited to this. Similarly to the case, a method of releasing the lock in conjunction with the set member 70 may be employed.
In the above embodiment, the main drive member, the sub drive member, the main buffer member, the sub buffer member, and the locking mechanism are configured corresponding to the leading blade 30 (the main drive member 51, the sub drive member 52, and the main buffer member 81). , The sub shock absorbing member 91 and the locking mechanism 100) and the configuration corresponding to the rear blade 40 (the main driving member 61, the sub driving member 62, the main shock absorbing member 82, the sub shock absorbing member 92, and the locking mechanism 110) are adopted. Although the case was shown, it is not limited to this, You may employ | adopt only in either the front blade | wing 30 or the rear blade | wing 40. FIG.
In the said embodiment, although the case where this invention was employ | adopted was shown in the structure containing the front blade 30 and the rear blade 40 as a blade member, it is not limited to this, As a drive mechanism which drives a blade member The present invention may be employed in a configuration including one blade member as long as it includes two drive members, a main drive member and a sub drive member.

  As described above, the focal plane shutter of the present invention is a focal plane shutter in which the driving member that drives the blade member is constituted by two driving members, while achieving simplification of the structure, downsizing of the apparatus, etc. Without being affected by temperature change, deterioration over time, etc., the impact and vibration when the drive member stops can be mitigated, a suitable captured image can be obtained, and the vibration convergence time due to camera shake correction etc. can be shortened, Since continuous shooting at a high speed by shortening the sequence is possible, it can be applied to cameras such as digital single-lens cameras and mirrorless cameras, as well as other optical equipment with an opening for exposure. Is also useful.

DESCRIPTION OF SYMBOLS 10 Ground plate 10k, 10m Part of ground plate 10a Opening part 20 Support plate 30 Leading blade (blade member)
40 Rear blade (blade member)
50 Front blade drive mechanism 51 Main drive member 52 Sub drive member 53 Drive spring 53b Free end portion 60 Rear blade drive mechanism 61 Main drive member 62 Sub drive member 63 Drive spring 63b Free end portion 70 Set members 81, 82 Main buffer member 91 , 92 Secondary buffer member 100, 110 Locking mechanism (regulation mechanism)
101, 111 Locking levers 101a, 111a Locking portions 101b, 111b Sliding portions 102, 112 Biasing spring 103 Electromagnetic actuator 120 Electromagnet

Claims (7)

A ground plane having an opening for exposure;
A blade member that opens and closes the opening;
A main drive member that is biased in a direction to cause the blade member to perform a shutter operation and is set at a set position before the shutter operation while resisting the biasing force;
A slave drive member coupled to the blade member and biased to follow the primary drive member set at the set position and moved by being pushed by the primary drive member during a shutter operation;
A main shock-absorbing member that first contacts the main drive member when the shutter operation is completed;
A focal plane shutter comprising: a secondary buffer member that contacts the secondary drive member after the primary drive member contacts the primary buffer member;
A locking mechanism for locking the slave drive member after the slave drive member abuts the slave buffer member and restricting reverse movement ;
Including a torsion coil type drive spring that biases the main drive member in a direction to cause the blade member to perform a shutter operation;
The drive spring has a free end portion whose one end side is fixedly fixed to the main plate and the other end side is fixed to a part of the main drive member and extends in a predetermined direction,
The free end portion of the drive spring is formed so as to contact a part of the ground plate before the main drive member contacts the main buffer member.
A focal plane shutter characterized by that. A ground plane having an opening for exposure;
A blade member that opens and closes the opening;
A main drive member that is biased in a direction to cause the blade member to perform a shutter operation and is set at a set position before the shutter operation while resisting the biasing force;
A slave drive member coupled to the blade member and biased to follow the primary drive member set at the set position and moved by being pushed by the primary drive member during a shutter operation;
A main shock-absorbing member that first contacts the main drive member when the shutter operation is completed;
A focal plane shutter comprising: a secondary buffer member that contacts the secondary drive member after the primary drive member contacts the primary buffer member;
A locking mechanism for locking the slave drive member after the slave drive member abuts the slave buffer member and restricting reverse movement;
The locking mechanism includes a locking lever having a locking portion that detachably locks the slave driving member, and biases the locking lever in a direction in which the locking portion locks the slave driving member. a biasing spring seen including,
Including an electromagnetic actuator that exerts a driving force on the locking lever;
The electromagnetic actuator is configured to drive the locking lever in a direction to release the locking of the slave drive member.
Off O over Culp Ren shutter you wherein a.   Including a torsion coil type drive spring that biases the main drive member in a direction to cause the blade member to perform a shutter operation;
  The drive spring has a free end portion whose one end side is fixedly fixed to the main plate and the other end side is fixed to a part of the main drive member and extends in a predetermined direction,
  The free end portion of the drive spring is formed so as to contact a part of the ground plate before the main drive member contacts the main buffer member.
The focal plane shutter according to claim 2. The locking lever includes a sliding portion on which the slave driving member slides before the locking portion locks the slave driving member.
The focal plane shutter according to claim 2 or claim 3 , wherein The blade member includes a front blade that opens the opening and a rear blade that closes the opening during shutter operation,
The main drive member, the sub drive member, the main buffer member, the sub buffer member, and the locking mechanism are provided corresponding to at least one of the leading blade and the trailing blade,
Focal plane shutter according to any one claims 1 to 4, characterized in that. Including a restriction mechanism for restricting movement of the driven member to hold the blade member in an open or closed state;
The locking mechanism also serves as the restriction mechanism,
The focal plane shutter according to any one of claims 1 to 5, wherein It claims 1 to with a focal plane shutter according to one 6 either,
A camera characterized by that.

Images