JP5479085B2 - Focal plane shutter for digital camera and digital camera equipped with the same - Google Patents

Description

  The present invention relates to a focal plane shutter for a digital camera and a digital camera including the same.

  There are two types of focal plane shutters for digital cameras: a type having two shutter blades, a leading blade and a rear blade, and a type having one shutter blade. In the former type, the leading blade covers the exposure opening in the set state, and when photographing, the leading blade and the trailing blade are sequentially moved in the same direction, and the leading blade starts to open the exposure opening. Exposure for photographing (hereinafter referred to as photographing exposure) for an image pickup device such as a CCD is started, and the photographing exposure is finished when the rear blade finishes closing the exposure opening. After that, when imaging information is stored in the storage device from the imaging element via the information processing circuit, a series of shooting operations as a camera after the release is completed.

  In the latter type, two types of photographing methods are known, and in both cases, the exposure aperture is fully opened in the set state. On the other hand, the electronic control circuit controls the image sensor. The photographic exposure is started and the photographic exposure is ended by closing the exposure opening by the shutter blade. On the other hand, both the start and end of the photographic exposure are both controlled by the electronic control circuit. The shutter blade closes the exposure opening after the control is performed. In any case, when the imaging information is transferred from the imaging device to the storage device via the processing circuit after the shutter blades have closed the exposure opening, a series of imaging operations as a camera is completed. .

  The present invention belongs to the former type of focal plane shutter for digital cameras. In the case of this type of focal plane shutter, the leading blade and the trailing blade are the leading blade driving member and the trailing blade driving member. At the time of shooting, these drive members are driven by rotating by the urging force of the leading blade driving spring and the trailing blade driving spring, and at the time of setting, these driving members are rotated from the initial position. The set member to be moved can be reversed to the set position against the biasing force of each drive spring. And, as a configuration for keeping these drive members in the set position until the next shooting is performed, conventionally, what is said to be a locking type as described below, and a direct type What is said is known.

  In other words, the locking type means that each drive member is locked by each locking member at the set position. Therefore, the set member may be immediately returned to the initial position when each driving member is locked to each locking member by a setting operation, or after the release of the camera, the leading blade driving member. May be returned to the initial position before the rotation is started by the biasing force of the driving spring for the leading blade, and at the time of photographing, each locking member is operated by each electromagnet to lock each driving member. When it is solved, the leading blade and the trailing blade are configured to travel.

  On the other hand, in the direct type, each drive member is provided with an iron piece member, and the set member is stopped in a state where these iron piece members are in contact with the respective electromagnets by the setting operation, and until the next photographing, It is intended to keep the state. Therefore, the set member returns to the initial position when the iron piece members are attracted to the respective electromagnets at the next photographing, and after that each electromagnet is demagnetized to release the respective iron piece members. The member rotates so that the leading blade and the trailing blade travel.

  In the case of a digital camera, as a means for observing a subject image before photographing, both an optical finder and an electronic finder using a display device such as a liquid crystal panel are provided. Recently, however, at least an electronic viewfinder has become the mainstream. When it is possible to observe the subject image before photographing using the electronic viewfinder, it is convenient to use the imaging element for photographing as an imaging element for observing the subject image before photographing. In that respect, the focal plane shutter of the type having only one shutter blade has the exposure opening fully open in the set state, so even if it is used as such, no special design is required. There is no such thing as not becoming.

  However, in the case of a focal plane shutter of the type having two shutter blades, in the set state, when the exposure opening is fully opened and the release button is pressed during photographing, first the leading blade is used. It is necessary to make the leading blade and the trailing blade run in the same direction in this order. And as a structure which makes it possible, it is known that the above-mentioned leading blade driving member is composed of two driving members. That is, one drive member is said to be the first drive member for the leading blade, etc., which connects the leading blade and is given a rotational force by a spring called a set spring, and the other is It is said to be a second driving member for the leading blade, and is given a rotational force by the driving spring for the leading blade.

  However, in such a configuration, when the leading blade is actuated by the biasing force of the set spring when the leading blade is actuated from the fully open position of the exposure aperture to the closed position prior to photographing, the leading blade is closed. When the first drive member for the leading blade comes into contact with the second driving member for the leading blade and stops at the position, it takes a long time to generate a large vibration in the leading blade by an impact and to obtain a stationary state. As a result, there is a problem that the actual shooting start timing is delayed. Further, in the case of the direct type configuration, since the second driving member for the leading blade includes the iron piece member, the impact when the first driving member for the leading blade comes into contact with the second driving member for the leading blade is affected. If it is larger, the iron piece member may be separated from the electromagnet, and the second driving member for the leading blade may cause the first driving member for the leading blade to be moved by the urging force of the leading blade driving spring earlier than a predetermined timing. Along with this, there is a problem that the front blade is caused to rotate.

  Therefore, a direct type focal plane shutter that solves these problems is described in Patent Document 1 below. However, although this focal plane shutter configuration is advantageous in terms of the number of parts, it cannot be said to be a preferable configuration from the viewpoint of production in view of parts processing and assembly processing. Therefore, in consideration of this point, a configuration suitable for mass production is described in Patent Document 2 below. The focal plane shutter described in Patent Document 2 can be used in a camera that can observe a subject image to be photographed only with an electronic viewfinder, and is equipped with a half mirror so that it can be optically operated without switching operation. It can be used for cameras that can be used with any one of the viewfinders and can be used for observation, and in some cases, it is equipped with a movable mirror, and either one of the optical viewfinder can be switched by switching operation. It can also be used in cameras that can be observed with

JP 2003-2222928 A JP 2007-298544 A

  As described above, even if the direct type focal plane shutter described in Patent Document 2 is a shutter having two shutter blades, an attempt is made to shoot using an imaging element for shooting before shooting. It is possible to observe an object image to be observed with an electronic viewfinder, and it has a very advantageous configuration in mass production. Needless to say, the focal plane shutter having the above-described configuration is a mode in which photographing exposure is started when the leading blade starts to open the exposure opening, and photographing exposure is finished when the trailing blade finishes closing the exposure opening. Shooting with

  However, recent high-end cameras are increasingly required to be multifunctional, and even a focal plane shutter configured to shoot in such a mode is selected by the photographer before shooting. Thus, from the state where the exposure aperture is fully open like the focal plane shutter having one shutter blade described above, the electronic control circuit controls the image sensor to start shooting exposure, and the shutter blade is exposed. Shooting in a mode that ends shooting exposure by closing the aperture, and both start and end of shooting exposure are performed by the electronic control circuit controlling the image sensor, and then the exposure aperture is opened by the rear blade. There is a request to be able to shoot in a mode that closes.

  The present invention has been made to solve such problems. The object of the present invention is based on the configuration of a focal plane shutter as described in Patent Document 2, and the leading blade is exposed. In addition to shooting in a mode that starts shooting exposure by opening the aperture and ends shooting exposure by closing the exposure aperture by the rear blade, start and end of shooting exposure with the exposure aperture fully open It is possible to shoot in a mode in which the electronic control circuit controls at least the start of the image sensor, and in the latter mode, depending on the specifications of the camera, only one specific control method is possible. For digital cameras that can be photographed by the photographer, or the photographer can select one of several different control methods for photographing. Culp Ren shutter, and to provide a digital camera having the focal plane shutter.

In order to achieve the above object, the focal plane shutter for a digital camera according to the present invention includes a leading blade and a trailing blade, and when the leading blade starts to open an exposure opening, photographing exposure is started, and the trailing blade is exposed. The camera has a first mode in which the photographing exposure is ended by closing the opening and a second mode in which the electronic control circuit controls the image pickup device to start the photographing exposure with the exposure opening being fully opened. A focal plane shutter capable of being selected and photographed by a selection means provided ;
A shutter base plate erected with a first axis, a second axis, a third axis, and a fourth axis ;
Front blade be linked to the first and the pushing portion and the second target pushing portion has a target suppression unit, a first driving member for rotatably mounted front blade to the first axis and,
Have a first pushing portion, the rotatably mounted on the first shaft, when the first mode is selected is rotated by the biasing force of the front blade driving spring during shooting a second driving member for the first blade to the first pushing portion to open the first both exposure opening in the rotated leading blade first driving member for the front blade press the pressing portion,
A set spring that biases the first drive member for the front blade and the front blade in a set state so that the front blade can operate to a position where the exposure opening is closed ;
Be linked to the trailing blade, said rotatably mounted on the second shaft, a blade driving member after to close the exposure aperture in the rear blades is rotated by the biasing force of the trailing blade driving spring at the time of shooting,
It is rotatably attached to the third shaft and rotates from the initial position to the set position during the set operation to resist the second blade driving member for the leading blade and the driving member for the trailing blade against the urging force of each driving spring. And a set member that returns to the initial position after the rotation button is pressed and the release button provided on the camera is pressed and before the exposure starts ,
Have a second pushing portion, the fourth is mounted so as to rotate in conjunction with the setting member with respect to the axis, during the set operation the first target pushing portion by the urging force of the set spring the second the second pushing portion of the first drive member from its middle for the first in contact with the pressing portion front blade being driven driving member for the first blade pushes the second target pushing portion reversed, when in a set state in which the second pushing portion is suppressed rotation of the first driving member for the first blade to maintain the opened state of the exposure opening by the first blade, the first mode is selected The first driving member for leading blades that is rotated by the biasing force of the set spring during the return operation of the setting member until the first driven portion contacts the first pushing portion of the second driving member for leading blades. the by way until contacting the second target pushing portion to the second pushing portion of the rotary sub And the member back to,
The have out possible countering element in the working locus of the canceling section, operating said attached to the shutter base plate, when the first mode is selected it is該抑stop member of the object preventing part When the second mode is selected when the second member is outside the locus , the restraining member is within the operation locus of the restrained portion and restrains the rotation of the first driving member for the leading blade due to the biasing force of the set spring. Deterrence means ,
To be equipped with.

  In such a focal plane shutter for a digital camera according to the present invention, in the set state, the restraining member can enter and exit within the operation locus of the restrained portion, and the second mode is selected, and the restrained portion Is in contact with the restrained portion by the rotation of the return member accompanying the return operation of the set member to the initial position, and thereafter the rotation of the first drive member for the leading blade is performed. By suppressing the above and maintaining the open state of the exposure opening by the leading blade, a preferable configuration can be obtained.

Further, when the second mode is selected, the state in which the restraining member restrains the rotation of the first blade driving member is that the second blade driving member for the leading blade is accompanied by the return operation of the set member. It is rotated by the urging force of the leading blade driving spring, and the first pushing portion of the leading blade second driving member presses the first pushed portion, thereby resisting the urging force of the set spring. When it is unraveled by rotating the first driving member for the leading blade, a preferable configuration is obtained.

  In this case, the restraining member is such that the second driving member for leading blades rotated in response to the return operation of the setting member rotates the first driving member for leading blades against the biasing force of the set spring. After that, it is preferable that the portion to be deterred is moved outside the operation locus. Furthermore, in this case, it is more preferable that the restraining member is moved out of the operation locus of the restrained portion before the return operation of the set member stops at the initial position.

In the focal plane shutter for a digital camera of the present invention, the first driving member for the leading blade is located at a position where the leading blade is stopped by opening the exposure opening, and the first driven portion is used for the leading blade. and when in contact with the first pressing portion of the second driving member, and when the second object pushing portion is brought into contact with the second pushing portion of the return member, the object to be suppression unit You may make it differ when it is made to contact the said suppression member. In addition, the suppression member and the first blade driving member are members in which the suppression member is rotatable about an axis perpendicular to the shutter base plate, and the suppressed portion is in contact with the suppression member. If the line of action of the force when touching is configured to pass through the axis, a suitable configuration can be obtained.

  In the focal plane shutter for a digital camera of the present invention, it is preferable that the suppression means is an electromagnetic device, and the suppression member is a movable element of the electromagnetic device that can reciprocate. Further, the suppression means may include an electromagnetic actuator and a member that is reciprocated by a mover of the electromagnetic actuator, and the member may be the suppression member. Furthermore, the suppression means may include an electromagnetic device and a member that reciprocates integrally with a mover of the electromagnetic device, and the member may be the suppression member. In that case, the mover is preferably a rotor.

  Furthermore, the digital camera of the present invention is provided with one of the focal plane shutters for the digital camera having various configurations. In this case, a moving image shooting button is provided in addition to the release button. When the moving image shooting button is pressed while the focal plane shutter for the digital camera is set, moving image shooting is performed while the moving image shooting button is being pressed. It may be possible to perform.

  The present invention includes a front blade and a rear blade, and an object image can be observed with an electronic viewfinder before shooting. At the time of shooting, the front blade starts to open the exposure aperture to perform shooting exposure. In a conventional focal plane shutter for a digital camera configured to start and complete photographing exposure when the rear blade finishes closing the exposure opening, the operation of the first drive member for the front blade that connects the front blade, Since a deterrence means capable of deterring at a suitable time for a suitable time is provided, photographing exposure is started when the leading blade starts to open the exposure aperture, and photographing is performed when the trailing blade finishes closing the exposure aperture. Shooting in the first mode in which the exposure is terminated, and at least the start and end of shooting exposure with the exposure aperture fully open The electronic control circuit controls the image sensor to select the second mode shooting, and the second mode shooting can be selected from a plurality of control methods. Therefore, it is possible to be able to do so.

It is the top view of Example 1 which showed the set state of the shutter. FIG. 2 is a plan view illustrating only a left half of the shutter opening / closing mechanism from FIG. FIG. 3 is a plan view showing a state in which the deterring means is operated from the state of FIG. 2 to a deterrable position immediately after the release in the case of shooting in the first mode of the second mode in the same manner as in FIG. 2. FIG. 4 is a plan view showing a state in which the rotation of the second blade driving member for the leading blade is completed from the state of FIG. 3 and stopped when the trailing blade driving member is slightly rotated. It is the top view which showed the state by which the suppression member was operated from the state of FIG. 4 to the position which cannot be suppressed like FIG. FIG. 6 is a plan view showing the state in which the rear blade driving member starts rotating from the state of FIG. 5 and the rear blade closes the exposure opening in the same manner as in FIG. 2. It is a timing chart which shows the operational relationship of each component means in the case of imaging | photography with the 1st system of 2nd mode. In the case of shooting in the first mode, immediately after the release, the state immediately before shooting in which the first driving member for the leading blade starts rotating from the state of FIG. 2 and the leading blade closes the exposure opening is the same as in FIG. It is the top view shown as follows. FIG. 9 is a plan view showing a state in which the leading blade and the trailing blade that have started exposure running from the state of FIG. 8 are in the middle of exposure running in the same manner as in FIG. It is a timing chart which shows the operation relation of each constituent means in the case of photographing in the first mode. It is a timing chart which shows the operational relationship of each component means in the case of imaging | photography with the 2nd system of 2nd mode. It is a timing chart which shows the operational relationship of each component means in the case of imaging | photography with the 3rd system of 2nd mode. It is a timing chart which shows the operational relationship of each structure means in the case of image | photographing by the 4th system of 2nd mode. FIG. 6 is a plan view of the second embodiment showing the shutter setting state in the same manner as in FIG. 2. FIG. 5 is a plan view of Example 2 showing the same state as FIG. 3 in the same manner as FIG. 2.

  The embodiment of the present invention will be described with reference to two illustrated examples. In these embodiments, the present invention is directed to photographing in a first mode in which photographing exposure is started when a leading blade starts to open an exposure opening, and photographing exposure is terminated when a trailing blade finishes closing the exposure opening, and exposure. A digital device that can selectively perform shooting in the second mode in which the electronic control circuit controls the image pickup element at least at the start and end of shooting exposure with the aperture fully open. This is configured as a focal plane shutter for a camera. The focal plane shutter can also be configured to select a plurality of control methods when shooting in the second mode.

  Further, the focal plane shutter for a digital camera of the present invention can be configured as a direct type focal plane shutter or a locking type focal plane shutter, but all of the embodiments are direct type focal plane shutters. This is configured as a plain shutter. 1 to 13 are for explaining the first embodiment, and FIGS. 14 and 15 are for explaining the second embodiment. In the description of the first embodiment, the description of the configuration, the operation description in the first mode, and the operation description for a plurality of control formulas in the second mode will be described in detail. Since only the configuration of the deterring means of the present invention is different from that of the first embodiment, only the different configuration will be described in detail, and other configurations and operations will be briefly described within the necessary range. .

  First, the configuration of the present embodiment will be described mainly with reference to FIGS. 1 and 2. FIG. 1 is a plan view showing the set state of the present embodiment as viewed from the subject side, and FIG. 2 is a plan view of FIG. 1 with a plurality of members covering most of the shutter opening / closing mechanism removed and about half of the left side. It is the top view which showed only. In the description of this embodiment, when the focal plane shutter of this embodiment is incorporated in a camera, the front side of FIG. 1 is the subject side (that is, the photographing lens side), and the back side of FIG. 1 is the imaging device side. It will be described on the assumption that However, as is well known, in the case of a digital camera, the near side in FIG. 1 may be the imaging device side, and the back side in FIG. 1 may be the subject side.

  The shutter base plate 1 of the present embodiment is made of synthetic resin, and an opening 1a for exposure having a rectangular shape is formed at a substantially central portion thereof. An intermediate plate 2 and an auxiliary base plate 3 described later are formed. In FIG. 1, a partial region on the right side of the opening 1a is shown in a cutaway manner. The shutter base plate 1 has two holes 1b and 1c on the left side and the lower side, and has a protruding portion 1d on the right side. However, the protruding portion 1d is attached to the camera body. It fits in the receiving part of the main body, and two screws (not shown) are inserted into the holes 1b and 1c for attachment.

  Further, as is well known, an intermediate plate 2 and an auxiliary ground plate 3 are sequentially attached to the shutter base plate 1 on the imaging device side at a predetermined interval, and will be described later between the shutter base plate 1 and the intermediate plate 2. The blade chamber of the rear blade is configured, and the blade chamber of the leading blade described later is formed between the intermediate plate 2 and the auxiliary base plate 3. Among them, the intermediate plate 2 only has a plurality of holes (not shown) fitted to a plurality of shafts (not shown) provided upright on the shutter base plate 1, but the auxiliary base plate 3 is synthesized. As shown in FIG. 1, the two hook portions 3b and 3c are hung on the two concave portions 1e and 1f formed on the subject side surface of the shutter base plate 1, and the openings 1a are formed. Each of the two shafts (not shown) standing in the left region is screwed with screws.

  As shown in FIG. 2, the outer shape of the intermediate plate 2 is slightly smaller than the outer shape of the shutter base plate 1, but the outer shape of the auxiliary base plate 3 is substantially the same as the outer shape of the shutter base plate 1. And the opening part 2a, 3a is formed also in the intermediate | middle board 2 and the auxiliary | assistant ground plate 3 in the place which overlaps with the opening part 1a. Of these, the opening 3a is actually only a rectangle slightly larger than the opening 1a, but the opening 2a is larger than the opening 1a and has two long sides. Corresponding edges are formed in a chevron shape. Therefore, in this embodiment, the shape of the opening 1a determines the shape of the exposure opening, that is, the shape of the image frame (shutter image frame) as a shutter.

  As shown in FIG. 2, on the subject side surface of the shutter base plate 1, two pillars 1g and 1h are erected in the upper region and the lower region in FIG. 2, and in the region between them. Four shafts 1i, 1j, 1k, 1m are erected. Further, four shafts 1n, 1p, 1q, and 1r are erected on the surface of the shutter base plate 1 on the imaging device side, and among these, the shafts 1n and 1p are concentric with the shafts 1i and 1j. Is erected.

  The shutter base plate 1 is formed with two arc-shaped elongated holes 1s, 1t centering on the axes 1i, 1j, and the lower end thereof has a substantially C-shaped planar shape. The known rubber cushioning members 4 and 5 are attached. Further, the shutter base plate 1 is formed with an arc-shaped elongated hole 1u centered on the axis 1k and an arc-shaped elongated hole 1v centered on the axis 1m. 1u and 1v are formed as long holes connected to one. In addition, although not shown in figure, the auxiliary | assistant ground plate 3 is also formed with the long hole of the same shape in the place facing long hole 1s, 1t. Further, the shape formed so that the long holes 1u and 1v form a series is difficult to understand in FIG. 2 due to the overlapping relationship with other members, but is easy to understand in FIG.

  The support plate 6 and the auxiliary plate 7 partially shown in FIG. 1 are overlapped with each other with the support plate 6 as the shutter base plate 1 side, and the above-mentioned pillars 1g and 1h are formed by two screws 8 and 9. It is screwed to the tip. These support plate 6 and auxiliary plate 7 are shown only in FIG. 1 together with a flexible printed wiring board 15 to be described later. Further, the shafts 1i, 1j, and 1k have small diameter portions at their tips, and by inserting these small diameter portions into holes (not shown) formed in the support plate 6, The auxiliary plate 7 is prevented from bending between the columns 1g and 1h.

  A well-known front blade electromagnet 10 and a rear blade electromagnet 11 having the same configuration shown by a one-dot chain line in FIG. 2 are attached to the surface of the support plate 6 on the shutter base plate 1 side. These electromagnets 10 and 11 include U-shaped iron core members 10a and 11a having two legs, and bobbins 10c and 11c each having a hollow portion and wound around coils 10b and 11b. ing. The iron core members 10a and 11a are attached in such a manner that two leg portions each having a tip as a magnetic pole portion are perpendicular to the support plate 6, and each of the leg portions has a bobbin 10c. , 11c. The bobbins 10c and 11c are provided with two terminal pins for the coils 10b and 11b, respectively, and their tips are inserted into holes (not shown) provided in the support plate 6 and the auxiliary plate 7, respectively. , Projecting to the subject side. The bobbins 10c and 11c around which the coils 10b and 11b are wound are shown only in FIG. 2, and only the iron core members 10a and 11a are shown in other drawings.

  Suppressing means 14 is attached to the subject side surface of the shutter base plate 1 with two screws 12 and 13. The suppression means 14 of the present embodiment is an electromagnetic device obtained by modifying the configuration of a known current control type actuator described in Japanese Patent Application Laid-Open No. 2005-173132. That is, in the electromagnetic actuator described in the above publication, the output pin for reciprocating the shutter blade is formed integrally with the permanent magnet rotor so as to be parallel to the rotation axis of the permanent magnet rotor. On the other hand, the restraining means 14 of this embodiment is made of synthetic resin in order to prevent the first blade driving member 16 described later from rotating counterclockwise. The rod-shaped restraining member 14b having a square front end surface is perpendicular to the rotation axis of the permanent magnet rotor 14a, that is, parallel to the surface of the shutter base plate 1. It is formed integrally with the permanent magnet rotor 14a.

  Therefore, the deterring means 14 of the present embodiment differs from the above-described configuration of the known current control type actuator only in that such a deterring member 14b is integrated with the permanent magnet rotor 14a. . Further, the current control actuator is an actuator that drives shutter blades, diaphragm blades, and the like by output pins. However, the suppression means 14 of this embodiment is not an actuator but a suppression member 14b. In this case, only the rotation of the first driving member 16 for the leading blade described later is suppressed. Therefore, although the configuration other than the suppression member 14b is well known, the overall configuration of the suppression means 14 will be briefly described here.

  First, the first stator frame 14c has a cup shape in which one end of a cylindrical shape is sealed, and constitutes an accommodation chamber for the permanent magnet rotor 14a between the plate-like second stator frame 14d. The stator frames 14c and 14d are integrated by keeping the permanent magnet rotor 14a in a bearing state in the housing chamber and winding the coil 14e around the bearing portions outside the housing chamber. Has been. A cylindrical yoke 14f is fitted on the outside of the first stator frame 14c so as to surround the coil 14e. Further, the first stator frame 14c is formed with a window that is not clearly defined in the radial direction, and the restraining member 14b protrudes from the window to the outside and has a predetermined angle by the permanent magnet rotor 14a. It can be reciprocated within the range.

  As shown in FIG. 2, four known magnetic rods are inserted into the first stator frame 14c from the subject side so as to be parallel to the rotation axis of the permanent magnet rotor 14a. The two terminal pins for the coil 14e are erected toward the subject side between the two magnetic rods on the upper right side of the coil 14e. On the other hand, the second stator frame 14d has two stopper portions 14d-1 and 14d-2 for restricting the operating range of the restraining member 14b. Attached to the shutter base plate 1.

  Here, the operation of the inhibiting means 14 will be briefly described. The permanent magnet rotor 14a of the present embodiment is magnetized to have two poles in the radial direction. When the coil 14e is energized in the forward direction, the permanent magnet rotor 14a rotates in the clockwise direction, and the restraining member 14b contacts the stopper portion 14d-1. Then, when the coil 14e is energized in the reverse direction, the coil 14e rotates counterclockwise, and the restraining member 14b comes into contact with the stopper portion 14d-2 and is stopped. Then, when the deterring member 14b is in contact with the stopper portions 14d-1 and 14d-2, the permanent magnet acting between the permanent magnet rotor 14a and the four magnetic rods is cut off when the coil 14e is de-energized. Due to the magnetic force of the rotor 14a, a rotating force is applied to the permanent magnet rotor 14a in either direction, and the contact state between the restraining member 14b and the stopper portions 14d-1, 14d-2 is maintained. ing.

  Note that “ON-CW” in the “suppression means control signal” described in the timing chart of FIG. 7 energizes the coil 14e in the forward direction as described above, and causes the permanent magnet rotor 14a to rotate clockwise. "ON-CCW" means a control for energizing the coil 14e in the reverse direction to rotate the permanent magnet rotor 14a in the counterclockwise direction. This means a state where a signal is emitted, and “OFF” indicates a state where an energization control signal for the coil 14e is not emitted. This also applies to other timing charts.

  As shown in FIG. 1, a flexible printed wiring board 15 is overlaid on the surface of the auxiliary plate 7 on the subject side, and a total of four terminal pins of the two electromagnets 10 and 11 are soldered. It is fixed by that. Further, the flexible printed wiring board 15 is partially bent at the right side twice and is also soldered to the two terminal pins provided on the first stator frame 14c of the restraining means 14. Further, a well-known switch mechanism necessary for flash photography is attached to the flexible printed wiring board 15, but illustration of those and wiring patterns necessary for them are omitted. In this embodiment, the flexible printed wiring board 15 is used. However, a hard printed wiring board may be used. In this case, as is well known, the auxiliary board 7 may not be provided. Many.

  As shown in FIG. 2, the first blade driving member 16 and the second driving member 17 for the leading blade are connected to the first blade driving member 16 and the leading blade second driving member 17 on the shaft 1 i erected on the shutter base plate 1. Each drive member 16 is mounted on the shutter base plate 1 side so as to be rotatable. In order to suitably attach the first blade first drive member 16 and the second blade second drive member 17 to the shaft 1i, actually, for example, a configuration described in Patent Document 2 is adopted. However, since there is no particular feature in such a mounting configuration, the detailed configuration is not shown.

  The first blade first drive member 16 has two driven parts 16a and 16b, a restrained part 16c, and a drive pin 16d. Among them, the pushed portion 16a and the restrained portion 16c are both positioned closer to the axis 1i than the restrained portion 16c in the portion formed thick on the subject side. And are formed adjacent to each other. And the to-be-driven part 16a is a site | part pressed by the pushing part 17d of the 2nd drive member 17 for leading blades mentioned later. Further, the restrained portion 16c is a portion that is restrained by coming into contact with the tip of the restraining member 14b of the restraining means 14 when the leading blade first drive member 16 is about to rotate counterclockwise.

  Further, the drive pin 16d is erected on the shutter base plate 1 side, is inserted into the long hole 1s of the shutter base plate 1, and the tip portion is inserted into the long hole (not shown) formed in the auxiliary base plate 3. doing. Further, the drive pin 16d is not clearly shown, but the cross-sectional shape of the root part is circular, and as shown, the cross-sectional shape of the tip part is an oval shape, and in FIG. The root portion is in contact with the buffer member 4 and the tip portion is connected to a leading blade described later.

  On the other hand, the second drive member 17 for the leading blade has a cylindrical portion 17a, a driven portion 17b, a mounting portion 17c formed thick on the subject side, and a pressing portion 17d. 17a is rotatably fitted to the shaft 1i. In addition, as shown in FIG. 2 with a part thereof cut, an iron piece member 18 and a compression spring 19 are accommodated in the mounting portion 17c. The iron piece member 18 has a disk-shaped head portion 18b at one end of the shaft portion 18a. The iron piece portion 18c is attached to the other end of the shaft portion 18a, and the compression is fitted to the shaft portion 18a. The spring 19 biases the iron piece portion 18c in a direction of protruding outward from the mounting portion 17c.

  The second blade driving member 17 is urged to rotate in the clockwise direction by a well-known blade driving spring (not shown). As described in Patent Document 2, the leading blade driving spring is a coil spring, which is loosely fitted to the cylindrical portion 17a of the leading blade second driving member 17, and has one end at the leading blade. The other end of the second drive member 17 is hung on the spring hook of a known ratchet member (not shown). The ratchet member is attached to the shaft 1i so as to be rotatable with respect to the shaft 1i on the tip side of the second driving member 17 for the leading blade, as described in Patent Document 2. It is regulated by a ratchet claw (not shown) provided on the support plate 6. Therefore, when the ratchet pawl is temporarily removed and the rotation position of the ratchet member is changed, the urging force of the leading blade drive spring can be adjusted.

  A rear blade drive member 20 is rotatably attached to the shaft 1j provided upright on the shutter base plate 1. The rear blade drive member 20 includes a cylinder portion 20a, an attachment portion 20b, and a drive pin 20c, and a roller 20d is rotatably attached, and the cylinder portion 20a is fitted to the shaft 1j. ing. Further, as shown in FIG. 2 with a part cut away, an iron piece member 21 and a compression spring 22 are accommodated in the mounting portion 20b.

  The iron piece member 21 has a disk-shaped head portion 21b at one end of the shaft portion 21a, and the iron piece portion 21c is attached to the other end of the shaft portion 21a. By the compression spring 22 fitted to the portion 21a, the iron piece portion 21c is urged in the direction of protruding from the inside of the mounting portion 20b. The drive pin 20c is erected on the shutter base plate 1 side, is inserted into the long hole 1t of the shutter base plate 1, and the tip is inserted into the long hole (not shown) of the auxiliary base plate 3. Similarly to the drive pin 16d, the drive pin 20c also has a circular cross-sectional shape at the base portion and a cross-sectional shape at the tip portion, and the base portion abuts against the buffer member 5. The leading end is connected to a rear blade described later.

  The rear blade drive member 20 is urged to rotate clockwise by a known rear blade drive spring (not shown). The drive blade for the rear blade is also a coil spring similar to the drive spring for the front blade, and is loosely fitted into the cylinder portion 20a of the drive member 20 for the rear blade, and one end of the drive spring for the rear blade is The other end is hung on the spring hook of a known ratchet member (not shown). The ratchet member is rotatably attached to the shaft 1j on the front end side with respect to the rear blade drive member 20, and the rotation position of the ratchet member provided on the support plate 6 is not shown. Is now regulated by. Therefore, if the ratchet pawl is temporarily removed and the rotation position of the ratchet member is changed, the urging force of the rear blade drive spring is adjusted.

  An operation member 23 is rotatably attached to the shaft 1h provided upright on the shutter base plate 1. The operation member 23 includes a driven pin 23a and a shaft portion 23b, and is urged to rotate counterclockwise by a spring (not shown). A set member 24 is rotatably attached to the shaft 1k provided upright on the shutter base plate 1. And this set member 24 has the axial part 24a. The link member 25 has a hole formed at one end thereof rotatably fitted to the shaft portion 23b of the operation member 23, and a hole formed at the other end can be rotated with respect to the shaft portion 24a of the set member 24. Is fitted. Therefore, in FIG. 2, when the operation member 23 rotates counterclockwise, the set member 24 also rotates counterclockwise. After that, when the operation member 23 rotates clockwise, the set member 24 also rotates clockwise. It has become.

  In addition to the shaft portion 24a, the set member 24 includes a cylindrical portion 24b, two pressing portions 24c and 24d, a pressing pin 24e, a contact pin 24f, and a recess 24g. The part 24b is rotatably fitted to the shaft 1k. Among them, the pushing portion 24c is a portion that pushes the pushed portion 17b of the second driving member 17 for the leading blade, and the pushing portion 24d is a portion that pushes the roller 20d of the driving member 20 for the trailing blade. .

  Further, the push pin 24e and the abutment pin 24f are erected on the shutter base plate 1 side, the push pin 24e is a portion for pushing a return member 26 described later, and the abutment pin 24f is the shutter base plate 1. This is a portion that is inserted into the arc-shaped long hole 1u formed in the above-mentioned shape and comes into contact with the lower end of the long hole 1u when the set member 24 rotates counterclockwise. The position where the contact pin 24f is in contact with the lower end of the long hole 1u in this way is the initial position for the set member 24.

  Further, as can be seen from FIG. 4, the concave portion 24 g is formed in a bay shape with the pushing portion 24 c side (the lower side in FIG. 4) opened on the surface of the shutter base plate 1 in the thick portion of the set member 24. ing. That is, the set member 24 is formed so that a region from the recessed portion 24g formed in a bay shape to the pushing portion 24c is a thin portion. A part of the wall surface formed perpendicular to the shutter base plate 1 at the edge of the recess 24g is used as a pressing portion 24g-1 for pressing a return member 26 described later. In FIG. 2, the reference numeral 24g-1 is omitted.

  The above-mentioned shaft 1m standing on the shutter base plate 1 is an extremely shorter shaft than the four shafts 1i, 1j, and 1k so far. A return member 26 is rotatably attached to the shaft 1m. By the way, in FIG. 2, the return member 26 is almost hidden behind the second drive member 17 for the leading blade, and its shape cannot be understood correctly. Therefore, the return member 26 will be described with reference to FIG.

  The return member 26 has a long protrusion 26a, a short protrusion 26b, and a push pin 26c, and is arranged so that the thin portion formed on the set member 24 and most of the area overlap. The protrusion 26a can enter the bay-shaped recess 24g of the set member 24. When the set member 24 rotates in the clockwise direction, the return member 26 is rotated counterclockwise by the projection 26a being pushed by the push pin 24e. After that, when the set member 24 rotates counterclockwise, the projection 26b is first pushed by the push pin 24e, and then the other projection 26a is pushed by the push portion 24g-1 to rotate clockwise. Rotate to.

  The push pin 26 c is provided on the shutter base plate 1 side of the return member 26, and the tip is inserted into the arc-shaped long hole 1 v formed in the shutter base plate 1. When the return member 26 is rotated counterclockwise by the set member 24, the push pin 26c pushes the driven portion 16b of the first driving member 16 for the leading blade and counterclockwise until then. The rotated first blade first drive member 16 can be rotated in the clockwise direction.

  Next, the structure of the front blade | wing and rear blade | wing arrange | positioned at the back side of the shutter base plate 1 is demonstrated. First, on the back side of the shutter base plate 1, the leading blade is an arm 27 that is rotatably attached to the shaft 1n, an arm 28 that is rotatably attached to the shaft 1q, and their It is comprised by the three blade | wings 29, 30, and 31 pivoted in order toward the front-end | tip part, and the blade | wing 31 is a slit formation blade | wing of a front blade | wing. The tip of the drive pin 16d of the first blade first drive member 16 is fitted in a long hole (not shown) formed in the arm 27 as is well known.

  Further, a set spring 32, which is a coil spring, is fitted on the shaft 1q of the shutter base plate 1, one end of which is hooked on a spring hook portion 1w provided on the shutter base plate 1, and the other end is hooked on a hole 28a of the arm 28. The arm 28 is urged to rotate counterclockwise. Accordingly, in the present embodiment, the set spring 32 serves to rotate the first blade first drive member 16 counterclockwise via the front blade, as will be apparent from the operation description to be described later. At the same time, however, it also serves as a loosening spring for the leading blade, as is well known. However, the urging force is smaller than the urging force of the front blade drive spring (not shown). The set spring 32 urges the arm 28 to rotate counterclockwise. However, the set spring 32 is configured to be fitted to the shaft 1n and urged to rotate the arm 27 counterclockwise. There is no problem.

  On the other hand, the rear blade has an arm 33 rotatably attached to the shaft 1p, an arm 34 rotatably attached to the shaft 1r on the back side of the shutter base plate 1, It consists of three blades 35, 36, and 37 that are pivotally supported in order toward the tip, and the blade 37 serves as a slit forming blade of the rear blade. The tip of the drive pin 20c provided on the rear blade drive member 20 is fitted in a hole (not shown) formed in the arm 33 as is well known.

  Further, a spring 38 is fitted on the shaft 1r of the shutter base plate 1 in the same manner as the set spring 32, and one end thereof is hooked on a spring hooking portion 1x provided on the shutter base plate 1, and the other. The end is hung on the hole 34a of the arm 34, and the arm 34 is urged to rotate counterclockwise. Therefore, the spring 34a urges the rear blade drive member 20 to rotate counterclockwise via the rear blade. However, the urging force is smaller than the urging force of the rear blade drive spring (not shown). Note that, unlike the set spring 32, the spring 38 only serves as a well-known backlash spring. Therefore, in the case of this spring 38, it is possible to apply a clockwise rotational force to the arm 34.

  Next, the operation of this embodiment will be described. As already explained, the digital camera focal plane shutter of the present embodiment starts photographing exposure by operating the selection means provided in the camera before photographing to start opening the exposure opening of the leading blade. The electronic control circuit controls at least one of the start and end of the photographic exposure while shooting in the first mode in which the photographic exposure is finished when the rear blade finishes closing the exposure opening and the exposure opening is fully opened. The second mode can be selected and taken by controlling the image sensor, and a plurality of control methods can be adopted when photographing in the second mode. It is like that. Therefore, at the camera specification determination stage, when shooting in the second mode, any one of the plurality of control methods can be adopted, or a plurality of methods can be adopted for shooting. It is also possible for a person to select a desired control method prior to shooting.

  Therefore, in describing the operation of the present embodiment, first, the case where the second mode is selected and shooting is performed using the first control method will be described, and then the case where the first mode is selected and shooting will be described. After that, other control methods that can be employed for the second mode shooting will be described. Therefore, first, the operation in the case where the photographing in the second mode is performed by adopting the first control method will be described with reference to FIGS. 2 to 6 are plan views showing each operation stage in that case, and FIG. 7 is a timing chart showing the operation relationship of each component means in that case.

  FIG. 2 shows a set state. At this time, the coils 10b and 11b of the two electromagnets 10 and 11 are not energized. However, the second blade driving member 17 and the rear blade driving member 20 are maintained in this state as will be described later. At this time, the coil 14e of the suppression device 14 is not energized. However, the rotor 14a is rotated counterclockwise, and the distal end portion of the restraining member 14b is retracted out of the operating locus of the restrained portion 16c of the first blade first drive member 16. ing. In the timing chart of FIG. 7, such a position of the deterring member 14 b is referred to as a “non-determination position”, and a position within the operation locus is referred to as a “determination possible position”. This also applies to other timing charts.

  At this time, the operation member 23 is rotated counterclockwise by a biasing force of a spring (not shown) because a member on the camera body side (not shown) is in contact with the right side of the pushed pin 23a. Therefore, this state is maintained, so that the set member 24 is also maintained in this state via the link member 25. Further, in this state, the push pin 24e of the set member 24 pushes the projection 26a of the return member 26, and the push pin 26c of the return member 26 becomes the pushed portion 16b of the first drive member 16 for the leading blade. Pressed. Therefore, the first drive member 16 for the leading blade cannot be rotated counterclockwise by the urging force of the set spring 32, and the three blades 29 to 31 of the leading blade are superposed, and the opening 1a. Is stored in the lower position.

  In this state, the pushing portion 24 c of the set member 24 is in contact with the pushed portion 17 b of the leading blade second drive member 17. Therefore, the second driving member 17 for the leading blade cannot be rotated clockwise by the biasing force of the driving spring for the leading blade (not shown), and the iron piece of the iron piece member 18 is in a state where the compression spring 19 is compressed. The part 18 c is brought into contact with the magnetic pole part of the iron core member 10 a of the leading blade electromagnet 10. Accordingly, in this state, the head portion 18b of the iron piece member 18 is separated from the attachment portion 17c of the second blade drive member 17 so that a part of the shaft portion 18a of the iron piece member 18 can be visually observed. Yes.

  Further, in this state, the pushing portion 24 d of the set member 24 is in contact with the roller 20 d of the trailing blade drive member 20. Therefore, the rear blade drive member 20 cannot rotate clockwise by the biasing force of the rear blade drive spring (not shown), and the iron piece portion 21c of the iron piece member 21 is in a state where the compression spring 22 is compressed. Is in contact with the magnetic pole part of the iron core member 11a of the electromagnet 11 for the rear blade. Therefore, the head portion 21b of the iron piece member 21 is separated from the mounting portion 20b of the rear blade drive member 20, and a part of the shaft portion 21a of the iron piece member 21 can be visually observed. At this time, the three blades 35 to 37 of the rear blade are superposed and stored at a position above the opening 1a.

  Thus, in the state of FIG. 2, the exposure opening, that is, the opening 1a is fully open, and the imaging device (not shown) is exposed to subject light, so the camera power switch is turned on. In this case, the current state of the subject to be photographed can be observed with the electronic viewfinder of the camera. In the timing chart of FIG. 7, such a time zone in which the subject image can be observed is referred to as a “live view range”, and a time zone in which the subject image cannot be observed is referred to as a “live view range”. In the timing chart of FIG. 7, the interval between the upper side and the lower side of the opening 1a is referred to as a “shutter image frame”. These are the same in other timing charts.

  In such a set state, the photographer selects the second mode by the mode selection means of the camera. At this time, if the camera is configured to be able to select a control method other than the first control method, the first control method is simultaneously selected. When the release button of the camera is pressed while observing the subject image with the electronic viewfinder, the coil 10b of the leading blade electromagnet 10 is not energized, but only the coil 11b of the trailing blade electromagnet 11 is energized. Therefore, until then, the iron piece member 21 that is simply brought into contact with the iron core member 11a of the rear blade electromagnet 11 is attracted and held by the electromagnetic force.

  On the other hand, the coil 14e of the deterring means 14 is energized in the forward direction almost simultaneously or a little earlier, so that the permanent magnet rotor 14a of the deterring means 14 is rotated clockwise. As described above, at this time, the first blade driving member 16 is prevented from rotating counterclockwise by the urging force of the set spring 32 by the return member 26. Therefore, the restraining member 14b is brought into contact with the stopper portion 14d-1 by causing the tip end portion thereof to face the operating locus of the restrained portion 16c of the first driving member 16 for leading blades by the rotation of the permanent magnet rotor 14a. Is stopped. That is, the deterring member 14b has reached the “deterrable position” described above. And when the suppression member 14b will be in such a state, electricity supply with respect to the coil 14e of the suppression means 14 will be cut | disconnected. The state at that time is shown in FIG.

  In the state shown in FIG. 3, a member on the camera main body (not shown) that is in contact with the pushed pin 23a of the operation member 23 is moved to the right in FIG. Therefore, the operation member 23 is rotated counterclockwise by a biasing force of a spring (not shown), and the set member 24 is rotated counterclockwise via the link member 25. As a result, the pushing portion 24c of the set member 24 is separated from the pushed portion 17b of the second driving member 17 for the leading blade, and the pushing portion 24d is separated from the roller 20d of the driving member 20 for the trailing blade.

  As is well known, at this time, the trailing blade drive member 20 is driven by the biasing force of the trailing blade drive spring (not shown) against the biasing force of the spring 38 and the biasing force of the compressed compression spring 22. Although it is slightly rotated in the clockwise direction, the mounting portion 20b comes into contact with the head portion 21b of the iron piece member 21 and stops. Therefore, at this time, the three blades 35 to 37 of the rear blade move slightly downward, but do not enter the opening 1a. The operation of the leading blade second drive member 17 at this time will be described later.

  Further, by this rotation, the setting member 24 first causes the push pin 24e to push the shorter projection 26b of the return member 26, and then the push portion 24g-1 enters the recess 24g. The longer projection 26a is pushed and the return member 26 is rotated clockwise. The set member 24 finally returns to the initial position when the contact pin 24f contacts the lower end edge of the long hole 1u formed in the shutter base plate 1.

  As described above, when the set member 24 starts to rotate counterclockwise from the state of FIG. 3, the return member 26 is thereby rotated clockwise, so the first blade first drive member 16 is By the urging force of the set spring 32 transmitted through the leading blade, the pushed portion 16b is rotated counterclockwise while following the pushing pin 26c of the return member 26. However, the rotation of the first driving member 16 for the leading blade is slight, and before the three blades 29 to 31 of the leading blade begin to close the opening 1a, the first driving member 16 for the leading blade is restrained. The part 16c is brought into contact with the tip of the restraining member 14b of the restraining means 14 and stopped.

  By the way, in the case of the present embodiment, when the restrained portion 16c of the leading blade first drive member 16 contacts the restraining member 14b of the restraining means 14, the action line of the rotational moment of the leading blade first drive member 16 is The permanent magnet rotor 14a of the restraining means 14 is configured to pass through the position of the rotational axis. Therefore, the deterrence performed by the deterring member 14b can be performed reliably, and the deterrence is not lost. However, in the present embodiment, the stopper 14d-1 is provided on the restraining means 14, so that the restrained part 16c of the first drive member 16 for the leading blades contacts the restraining member 14b of the restraining means 14. You may comprise so that the force which rotates the permanent magnet rotor 14a clockwise may act when it contacts.

  In addition, the suppression means of this invention is an electromagnetic device provided with the permanent magnet rotor like the present Example, Comprising: It is not limited to the structure by which the suppression member is united with the rotor. It may be the deterring means 41 in the second embodiment to be described later. Further, the suppression means of the present invention is not configured as an electromagnetic device, and can be reciprocally rotated or linearly reciprocated by various electromagnetic actuators such as the known current control type motor and the known stepping motor. It may be configured. Moreover, the suppression means of this invention may have the structure by which the suppression member was integrated with the rotor and output shaft of a known stepping motor. In that case, when the restrained portion 16c of the first drive member 16 for the leading blade comes into contact with the restraining member, the action line of the rotational moment of the first drive member 16 for the leading blade is the rotor as described above. It is preferable that it is configured to pass through the position of the rotation axis. This can also be said for any configuration when the suppression member is configured to rotate around an axis perpendicular to the shutter base plate.

  As described above, when the pushing portion 24c of the set member 24 is separated from the pushed portion 17b of the second driving member 17 for the leading blade, the coil 10b of the electromagnet 10 for the leading blade is not energized. The blade second drive member 17 is rapidly rotated clockwise by the biasing force of the front blade drive spring (not shown), and at the final stage, the pushing portion 17d is restrained by the restraining member 14b. The pushed portion 16a of the first driving member 16 for the leading blade is pushed, and the first driving member 16 for the leading blade is returned to the state of FIG. 3 together with the leading blade against the biasing force of the set spring 32.

  In this embodiment, since it is not particularly necessary, the coil 10b of the leading blade electromagnet 10 is not energized at this time, but energized simultaneously with the energization of the coil 11b of the trailing blade electromagnet 11 as described above. In addition, it is possible to cut off the energization at this stage. Further, it is preferable that the rotation of the leading blade second drive member 17 at this time is stopped before the start of photographing exposure. In particular, when the pushing portion 17d of the leading blade second drive member 17 comes into contact with the pushed portion 16a of the leading blade second drive member 16, a large impact is generated, so that the set member 24 stops at the initial position. If the camera is stopped before the shooting is started, the shooting start timing can be advanced, the possibility of missing a shooting opportunity is reduced, and it is advantageous for continuous shooting.

  On the other hand, when the pushing portion 24d of the set member 24 is separated from the roller 20d of the trailing blade drive member 20 as described above, the trailing blade drive member 20 is illustrated against the biasing force of the spring 38. Due to the urging force of the trailing blade drive spring and the urging force of the compression spring 22, the blade starts rotating clockwise while operating the trailing blade. However, since the coil 11b of the rear blade electromagnet 11 is already energized and the iron piece member 21 is attracted to the iron core member 11a, the mounting portion 20b of the rear blade drive member 20 is the head of the iron piece member 21. It stops when it comes into contact with 21b. This state is shown in FIG.

  In this way, in the state of FIG. 4, the coil 14e of the suppression means 14 is energized in the opposite direction to the above case. Therefore, the permanent magnet rotor 14a rotates counterclockwise to retract the tip of the restraining member 14b from the operating locus of the restrained portion 16c of the first drive member 16 for the leading blade, and the restraining member 14b is moved to the stopper portion 14b. -2 to stop. This state is shown in FIG. And when it will be in this state, electricity supply to coil 14e will be cut off. In this state, the imaging apparatus is changed from the live view state to the photographing exposure state by a photographing exposure start signal from the electronic control circuit (CPU). Further, the exposure time control circuit starts counting the control time corresponding to the shooting conditions such as the brightness of the subject by the shooting exposure start signal.

  Thereafter, when counting of the control time by the exposure time control circuit ends, the energization to the coil 11b of the rear blade electromagnet 11 is cut off by the end signal. Therefore, the suction force of the iron core member 11a with respect to the iron piece member 21 is lost, so that the rear blade drive member 20 is rapidly rotated clockwise by the bias force of the rear blade drive spring against the bias force of the spring 38. Be made. Then, the three blades 35 to 37 of the rear blades travel downward while reducing the overlap between the adjacent blades, and the exposure opening, that is, the opening 1a is moved upward with the slit forming blade 37 at the head. Close from.

  When the three blades 35 to 37 are deployed and the opening 1a is completely closed, immediately after that, the drive pin 20c of the rear blade drive member 20 comes into contact with the buffer member 5, thereby The travel of the blade drive member 20 and the rear blade is stopped. The stop state is shown in FIG. In this state, the captured imaging information is transferred from the imaging device via the information processing circuit and stored in the storage device.

  When the imaging information is stored in the storage device, the set operation is started immediately. In the state of FIG. 6, when a member on the camera body (not shown) pushes the driven pin 23a and rotates the operation member 23 clockwise against a biasing force of a spring (not shown), an initial position is obtained. The set member 24 located at is also rotated clockwise through the link member 25. Further, when the set member 24 starts to rotate, the push pin 24e pushes the protrusion 26a of the return member 26 to rotate the return member 26 counterclockwise. In this embodiment, the return member 26 is not biased to rotate clockwise by the spring, but in the initial stage of such counterclockwise rotation, the protrusion 26a. However, since it is sandwiched between the push pin 24e and the push portion 24g-1, it is smoothly rotated counterclockwise without large backlash.

  Thus, when the set member 24 and the return member 26 start to rotate, first, the pushing portion 24c of the set member 24 pushes the pushed portion 17b of the second driving member 17 for the leading blade, and the leading blade first. 2. The drive member 17 starts to rotate counterclockwise against the biasing force of the leading blade drive spring (not shown). At this time, since the first blade driving member 16 is given a force that rotates counterclockwise via the leading blade by the biasing force of the set spring 32, the first blade first driving member 16 also has The driven portion 16a follows the pressing portion 17d of the second driving member 17 for the leading blade and starts to rotate counterclockwise. At the same time, the three blades 29 to 31 of the leading blade move upward.

  Thereafter, when the slit forming blade 31 of the leading blade overlaps the slit forming blade 37 of the trailing blade by a predetermined amount, the pushing portion 24d of the setting member 24 starts to push the roller 20d of the driving member 20 for the trailing blade. The drive member 20 is also rotated counterclockwise against the biasing force of a rear blade drive spring (not shown). Accordingly, the drive pin 20c of the rear blade drive member 20 rotates the rear blade arm 33 counterclockwise, so that the three blades 35 to 37 of the rear blade are started to move upward. Thereafter, the three blades 29 to 31 of the leading blade reduce the overlap between adjacent blades, and the three blades 35 to 37 of the rear blade increase the overlap between adjacent blades. However, they are both moved upward.

  In this way, when the three blades 29 to 31 of the leading blade reach a position that covers approximately half of the opening 1a, the driven portion 16b of the first driving member 16 for leading blade is counterclockwise. It contacts the push pin 26c of the return member 26 that has rotated. And in the contact | abutting step, the protrusion part 26a of the return member 26 is still in the state clamped by the pushing pin 24e and the pushing part 24g-1 of the set member 24. FIG.

  At this stage, when the pushed portion 16b comes into contact with the pushing pin 26c of the return member 26, the pushed portion 16b is pushed by the pushing pin 24e thereafter, and the leading blade first The one driving member 16 is rotated in the reverse direction and rotated clockwise against the urging force of the set spring 32. In this process, the return member 26 comes to have its projection 26a escape from the recess 24g of the set member 24. Finally, the first blade first drive member 16 is returned to the state shown in FIG. The three blades 29 to 31 of the leading blade are overlapped and stored in a position below the opening 1a.

  On the other hand, the second driving member 17 for the leading blade and the driving member 20 for the trailing blade are subjected to the biasing force of each driving spring (not shown) even after the first driving member 16 for the leading blade is reversed in the clockwise direction. The counter blade continues to rotate counterclockwise, and when the three blades 35 to 37 of the rear blade are overlapped and completely retracted from the opening 1a, the second drive for the leading blade is immediately after that. The iron pieces 18c and 21c of the iron pieces 18 and 21 attached to the member 17 and the rear blade drive member 20 are connected to the iron core members 10a and 11a of the leading blade electromagnet 10 and the rear blade electromagnet 11 one after another. Abut.

  Slightly after the contact, the operation of the member on the camera body (not shown) that has pushed the pushed portion 23a of the operation member 23 stops. Thereby, the rotation of the set member 24 is also stopped. In the process from the contact until the set member 24 stops, the iron piece portions 18c and 21c of the iron piece members 18 and 21 compress the compression springs 19 and 22 while attaching the mounting portions 17c and It is pushed into 20b. Therefore, when the rotation of the set member 24 and the drive members 17 and 20 stops, part of the shaft portions 18a and 21a of the iron piece members 18 and 21 is pushed out from the mounting portions 17c and 20b, and the head portions 18b and 21b are moved. The mounting parts 17c and 20b are separated from each other. In this way, the stopped state of each drive member 16, 17, 20 and the set member 24 is the set completion state shown in FIG. This state is maintained by the above-described member on the camera body side (not shown) until the release button of the camera is pressed during the next shooting.

  Next, the operation when shooting in the first mode will be described with reference to FIGS. 2 and 6 used in the above description and FIGS. In this case, in the set state of FIG. 2, the photographer selects the first mode by the mode selection means of the camera. At this time, if the power switch of the camera is turned on, the subject image can be observed (live view) by the electronic display device.

  When the release button of the camera is pressed while observing the subject image with the electronic viewfinder, first, both the coil 10b of the leading blade electromagnet 10 and the coil 11b of the trailing blade electromagnet 11 are energized. Therefore, until then, the iron piece members 18 and 21 that are merely brought into contact with the iron core members 10a and 11a of the electromagnets 10 and 11 are attracted and held by electromagnetic force. On the other hand, when this mode is selected, the coil 14e of the suppression means 14 is not energized at all. Therefore, the restraining member 14b of the restraining means 14 always maintains a state in contact with the stopper portion 14d-2.

  As described above, when the iron piece members 18 and 21 are attracted and held by the iron core members 10a and 11a of the two electromagnets 10 and 11, a member on the camera body side (not shown) is pushed by the driven portion 23a of the operation member 23. Move to the right. Therefore, the operating member 23 is rotated counterclockwise by a biasing force of a spring (not shown), and the setting member 24 is rotated counterclockwise via the link member 25. As a result, the pushing portion 24c of the set member 24 is separated from the pushed portion 17b of the second driving member 17 for the leading blade, and the pushing portion 24d is separated from the roller 20d of the driving member 20 for the trailing blade.

  Then, the second driving member 17 for the leading blade starts to rotate clockwise by the biasing force of the driving spring for the leading blade (not shown) and the biasing force of the compression spring 19, and the driving member 20 for the trailing blade is Against the urging force, the wing force of the rear blade drive spring and the urging force of the compression spring 22 (not shown) start rotating in the clockwise direction while operating the rear blade. However, since the iron piece members 18 and 21 are already attracted to the iron core members 10a and 11a, the drive members 17 and 20 have their mounting portions 17c and 20b attached to the head portions 18b and 21b of the iron piece members 18 and 21, respectively. Abutted and stopped. Therefore, at the stage where the trailing blade driving member 20 is stopped, the trailing blade is not in the opening 1a.

  On the other hand, in the process in which the set member 24 rotates counterclockwise as described above, the return member 26 rotates in the clockwise direction, so that the first drive member 16 for the leading blade passes through the leading blade. Due to the transmitted urging force of the set spring 32, the pushed portion 16b follows the push pin 26c of the return member 26 and rotates counterclockwise. Therefore, the three blades 29 to 31 of the leading blade move upward while reducing the overlap between adjacent blades, and close the opening 1a from below the opening 1a.

  Then, immediately before the opening 1 a is completely closed, the contact between the driven portion 16 b of the first blade driving member 16 and the pressing pin 26 c of the return member 26 is released. Therefore, the first drive member 16 for the leading blade thereafter rotates faster than before, and immediately after the three blades 29 to 31 of the leading blade completely close the opening 1 a, The moving portion 16 b is brought into contact with the pushing portion 17 d of the leading blade second drive member 17 and stopped.

  At this time, the first blade driving member 16 for the leading blade is released from the contact between the driven portion 16b and the pressing pin 26c of the return member 26, and then the driven portion 16a is moved to the second driving member 17 for the leading blade. Since the rotation angle until it abuts against the pushing portion 17d is small, it hardly bounces even when it abuts against the pushing portion 17d, and it does not vibrate greatly due to the impact when the leading blade also abuts and quickly stops. On the other hand, the abutment pin 24f abuts against the lower end edge of the long hole 1u of the shutter base plate 1 in parallel with the set member 24 and stops at the initial position. This state is shown in FIG.

  In the state of FIG. 8, the energization to the coil 10 b of the leading blade electromagnet 10 and the coil of the trailing blade electromagnet 11 are performed at time intervals determined by the exposure time control circuit corresponding to the photographing conditions such as the brightness of the subject. The energization to 11b is cut off in turn. First, when the energization of the coil 10b of the leading blade electromagnet 10 is cut off, the leading blade second drive member 17 is rapidly rotated clockwise by the biasing force of the leading blade driving spring (not shown). However, at this time, the pushing portion 17d of the leading blade second drive member 17 pushes the pushed portion 16a of the leading blade first drive member 16, so that the leading blade first drive member 16 also has the set spring 32. It is rapidly rotated clockwise against the urging force. Thereby, the three blades 29 to 31 of the leading blade are caused to travel downward rapidly while increasing the overlap between adjacent blades, and the opening 1a is opened from the top to the bottom.

  Subsequently, when the energization of the coil 11 b of the rear blade electromagnet 11 is cut off, the rear blade drive member 20 is rapidly moved against the bias force of the spring 38 by the bias force of the rear blade drive spring (not shown). Is rotated clockwise. Thereby, the three blades 35 to 37 of the rear blades are rapidly moved downward while reducing the overlap between adjacent blades, and the opening 1a is closed from the upper side to the lower side. After the rear blade slit forming blade 37 starts to close the opening 1a, the image receiving surface of the image sensor is formed by the slit formed between the leading blade slit forming blade 31 and the rear blade slit forming blade 37. Are exposed from above to below. The state during the exposure running is shown in FIG.

  Thereafter, when the slit forming blade 31 of the leading blade retracts below the opening 1a, immediately after that, the driving pin 16d of the leading blade first driving member 16 comes into contact with the buffer member 4, whereby the leading blade first The exposure traveling by the three members of the driving member 16, the second driving member 17 for the leading blade, and the leading blade is stopped. Subsequently, when the three blades 35 to 37 of the rear blade are in the deployed state and the opening 1a is completely closed, the drive pin 20c of the rear blade drive member 20 comes into contact with the buffer member 5 immediately thereafter. As a result, the exposure running of the rear blade drive member 20 and the rear blade is stopped. This state is the state shown in FIG.

  In the state of FIG. 6 in this way, the captured imaging information is transferred from the imaging device via the information processing circuit and stored in the storage device. When the imaging information is stored in the storage device, the set operation is immediately performed. The set operation is exactly the same as the set operation in the case of shooting in the second mode. Therefore, the description of the operation is omitted to avoid duplication.

  The return member 26 in the present embodiment is configured to be reciprocally rotated by the unique interlocking configuration as described above with the set member 24, but the interlocking configuration of the present invention is limited to such a configuration. For example, the connection configuration of the “suppressing members 28 and 41” and the “set member 27” in the two embodiments described in Patent Document 2 may be employed.

  Further, the set spring 32 of this embodiment is fitted on the shaft 1q of the shutter base plate 1, and one end thereof is hooked on the spring hooking portion 1w of the shutter base plate 1, and the other end is hooked on the arm 28 of the leading blade. However, the present invention is not limited to such a configuration, and the set spring 32 is fitted on the shaft 1i of the shutter base plate 1, and one end thereof is hooked on the first blade first drive member 16 and the other end. Is applied to the leading blade second driving member 17 so that the leading blade first driving member 16 can rotate counterclockwise with respect to the leading blade second driving member 17 and the leading blade second driving member 17. The second drive member 17 may be rotated clockwise with respect to the first blade first drive member 16.

  Next, the operation when the second mode is used for photographing in the second mode will be described with reference to FIGS. 2 to 4 and 6 used in the above description, and FIG. I will explain. FIG. 11 which is newly used is a timing chart showing the operational relationship of each constituent means in the case of shooting with the second control method. Note that the operation in the second control method is often in common with the operation in the first control method. Therefore, their common operations will be omitted or simplified.

  In the case of the first control method described above, even if the mode selection means provided in the camera is operated to select shooting in the second mode using the first control method, As shown in FIG. 2, the restraining member 14b of the restraining means 14 does not exist in the operation locus of the restrained portion 16c of the first driving member 16 for the leading blade, and the photographer When the release button of the camera is pressed while observing the subject image with the viewfinder, the coil 14e of the deterring means 14 is energized in the forward direction so that the deterring member 14b enters the operating locus of the deterred portion 16c. It was.

  However, in the case of the second control method, before shooting, the mode selection means provided in the camera is operated to select to perform shooting in the second mode using the second control method. Thus, a current is supplied in the forward direction to the coil 14e of the suppression means 14. Therefore, before pressing the release button of the camera, the state shown in FIG. 3 has already been obtained, and the coil 14e is not energized. Further, when the state shown in FIG. 3 is obtained, when the mode selection unit of the camera is operated, for example, the photographing in the first mode is selected, the suppression unit 14 is in the operation stage. The current is supplied to the coil 14e in the opposite direction, and the current supply to the coil 14e is cut off after the state of FIG. 2 is obtained.

  After the state of FIG. 3 is obtained in this way, when the release button of the camera is pressed while observing the subject image with the electronic viewfinder, the coil 10b of the leading blade electromagnet 10 is not energized and the trailing blade electromagnet 11 is not energized. Only the coil 11b is energized. Therefore, the iron piece member 21 that has been in contact with the iron core member 11a of the electromagnet 11 for the rear blade is attracted and held by electromagnetic force. Thereafter, the set member 24 is rotated counterclockwise by the operation member 23 and returned to the initial position. In the process, the return member 26 is rotated clockwise.

  In this way, when the return member 26 is rotated in the clockwise direction, the first blade driving member 16 causes the pushed portion 16b to be applied to the push pin 26c of the return member 26 by the biasing force of the set spring 32. The follower is rotated counterclockwise, but the rotation is slight. Before the leading blade starts to close the opening 1a, the restrained portion 16c of the first driving member 16 for the leading blade is prevented by the restraining means 14. The restraining member 14b is brought into contact with the distal end portion and stopped.

  On the other hand, when the setting member 24 starts to rotate counterclockwise as described above, the pushing portion 24d of the setting member 24 is separated from the roller 20d of the trailing blade driving member 20, and the pushing portion 24c of the setting member 24 is moved. It leaves | separates from the to-be-driven part 17b of the 2nd drive member 17 for leading blades. Therefore, the rear blade driving member 20 is slightly rotated clockwise by the biasing force of the rear blade driving spring (not shown) and the biasing force of the compression spring 22 against the biasing force of the spring 38, and the rear blade is Before entering the opening 1a, it stops as already described. In addition, since the second driving member 17 for the leading blade is not energized to the coil 10b of the electromagnet 10 for the leading blade, it is rotated in the clockwise direction by the urging force of the leading blade driving spring (not shown). As a result, the second driving member 17 for the leading blades has the leading blade second driving member 17 against the urging force of the set spring 32 by the pushing portion 17d pushing the pushed portion 16a at the final stage of its rotation. 1 The drive member 16 is returned to the state of FIG. 3 together with the leading blade. FIG. 4 shows a state where the set member 24 has also returned to the initial position.

  When the state shown in FIG. 4 is obtained in this way, the imaging apparatus is changed from the live view state to the shooting exposure state by the shooting exposure start signal from the electronic control circuit (CPU), and the exposure time control circuit starts the shooting exposure. Counting of control time is started by a signal. After that, when the counting of the control time by the exposure time control circuit ends, the energization to the coil 11b of the rear blade electromagnet 11 is cut off by the end signal, so that the rear blade drive member 20 is connected to the rear blade drive spring. The blade is rapidly rotated clockwise by the urging force, and the three blades 35 to 37 of the rear blade are caused to travel downward. Then, the rear blade drive member 20 stops when the drive pin 20c contacts the buffer member 5 immediately after the blades 35 to 37 completely cover the opening 1a.

  By the way, in the case of the first control method described above, when the state of FIG. 4 is obtained, before the photographing is started by the signal from the electronic control circuit (CPU), the reverse of the coil 14e of the suppression means 14 is performed. The current was supplied in the direction, and the restraining member 14b was retracted out of the operation locus of the restrained portion 16c of the first blade first drive member 16. However, in the case of the second control method, when the state of FIG. 4 is obtained, the coil 14e of the deterring means 14 is not energized, and the rear blade closes the opening 1a as described above. After that, it is energized in the reverse direction.

  Therefore, in the case of this operation method, as in the case of the first control method, in order to prevent even a slight vibration caused by the retraction operation of the suppression member 14b from adversely affecting the captured image, Since there is no need to start shooting exposure after the evacuation operation is completed, it is possible to shorten the time from when the camera's release button is pressed until shooting exposure starts, such as moving subjects. On the other hand, there is an advantage that the chance of missing a photo opportunity is reduced.

  After the opening 1a is closed in this way, when a reverse current is supplied to the coil 14e of the restraining means 14, the permanent magnet rotor 14a rotates counterclockwise and the restraining member 14b is stopped by the stopper. It stops by contacting the part 14d-2. Thereafter, the state where the power supply is cut off is shown in FIG. In this state, the captured imaging information is transferred from the imaging device via the information processing circuit and stored in the storage device. Thereafter, the set operation is started immediately, but since the operation is exactly the same as when the first control method is selected, the description thereof is omitted.

  When the set operation is completed, the state shown in FIG. 2 is obtained as described above. However, in the case of the first control method, the photographer does not need to perform the next shooting even in such a state. As long as the release button of the camera was not pressed, the coil 14e of the deterring means 14 was not energized. However, in the case of this second control method, when the set completion state of FIG. 2 is reached, a forward current is immediately supplied to the coil 14e. Therefore, the permanent magnet rotor 14a is rotated in the clockwise direction, and is stopped when the restraining member 14b comes into contact with the stopper portion 14d-1. Thereafter, the state in which the power supply to the coil 14e is cut off is the state shown in FIG. 3, and in this state, the next photographing is awaited.

  As described above, in the case of the second control method, before the release button of the camera is pushed, the restraining member 14b is already within the operation locus of the restrained portion 16c of the first driving member 16 for the leading blade. Existing. Therefore, also from this point, it is possible to make the time from when the release button of the camera is pressed to when the exposure is started shorter than in the case of the first control method. This reduces the chance of missing a photo opportunity. Therefore, in the case of the second control method, both of this and, as described above, after the travel of the rear blade at the time of photographing is completed, the suppression member 14b is changed from the state of FIG. 4 to the state of FIG. There is a feature that the time from when the release button of the camera is pressed to when shooting exposure is started can be shortened.

  Next, the operation in the case where the shooting in the second mode is performed by adopting the third control method will be described mainly with reference to FIG. However, the operation according to the third control method is almost the same as the operation according to the second control method. Therefore, only the difference in operation between the two will be described, and the entire description will be omitted. FIG. 12 is a timing chart showing the operational relationship of each component when shooting is performed with the third control method.

  As can be seen from a comparison between FIG. 12 and FIG. 11 used for explaining the operation in the second control method, the difference between the two is in the time zone before and after the set operation ends. The operation relationship in other time zones is exactly the same. That is, in the case of the second control method, after the setting operation is completed and the trailing blade driving member 20 is stopped, in other words, the clockwise rotation of the setting member 24 is stopped, and the state of FIG. After being obtained, the forward current is supplied to the coil 14e of the suppression means 14. On the other hand, in the case of the third control method, before the set operation is completed, that is, the rear blade drive member 20 and the rear blade are still in the set operation, and the rear blade is retracted from the opening 1a. Immediately after that, supply of forward current to the coil 14e is started.

  Therefore, the state of FIG. 3 can be obtained earlier in the third control method than in the second control method. That is, since the time from when the release button of the camera is first pressed until the standby state for the next shooting is obtained is shortened, there is an advantage that the next shooting can be started earlier.

  Next, an operation when photographing in the second mode is performed using the fourth control method will be described. Also in this case, if only the points different from the conventional control method are described, it is possible to easily understand the entire operation without needing to explain in detail. Therefore, the operation in the fourth control method will be mainly described with reference to FIG. 13 with a focus on differences from the above control methods. FIG. 13 is a timing chart showing the operational relationship of each component when shooting with the fourth control method.

  The fourth control method is a control method for performing continuous shooting. Also in this case, when the fourth control method is selected by the mode selection unit of the camera, a forward current is applied to the coil 14e of the suppression unit 14 as in the second and third control methods. The tip of the restraining member 14b is supplied and enters the operation locus of the restrained portion 16c of the first blade first drive member 16. Therefore, the state shown in FIG. 3 is a state immediately before the release button of the camera is pressed.

  As is well known, continuous shooting is shooting in which a plurality of shootings are continuously performed. Since this shooting is mainly performed when shooting a subject whose state has changed, the shorter the time required for one shooting cycle, the better. Therefore, when the fourth control method is selected, as described above, after the tip of the restraining member 14b enters the operating locus of the restrained portion 16c of the first drive member 16 for the leading blade, The energization to the coil 14e is cut off. When the release button of the camera is pressed, the coil 14e is not energized at all until the end of continuous shooting. Therefore, the restrained portion 16d of the first drive member 16 for the leading blade is restrained by abutting against the restraining member 14b of the restraining means 14 when the set member 24 is set, and when the set member 24 is returned to the initial position. However, the three blades 29 to 31 of the leading blade do not enter the opening 1a although the separation from the inhibition member 14b of the inhibition means 14 is repeated. Other components only repeat the operation already described.

  When the release button that has been kept pressed is returned to end the continuous shooting, the three blades 35 to 37 of the rear blade close the opening 1a in the process of the last shooting cycle. Before the state shown in FIG. 2 is reached, in order to reset a control circuit (not shown), a current in the reverse direction is supplied to the coil 14e of the suppression means 14, and the suppression member 14b is once shown in FIG. However, in the case of the present embodiment, the timing is such that the to-be-inhibited portion 16c of the first driving member 16 for the leading blade contacts the inhibiting member 14b of the inhibiting means 14. Since it is preferable to do this when the set member 24 is at the initial position, or when the set member 24 is at or near the set position, as will be understood from the above description, the operation is performed.Therefore, in FIG. 13, the operation of the “suppression means (14)” and the generation state of the “suppression means control signal” at those times are indicated by broken lines.

  As can be seen from the description of the operation so far, in the case of the digital camera provided with the focal plane shutter according to the present embodiment, the first mode is operated by operating the selection means provided in the camera before photographing. It is possible to select shooting in the second mode and shooting in the second mode, but when shooting in the second mode, depending on the design specifications, adopt one of the above four control methods. It is also possible to perform shooting only with that control method, and adopt a plurality of control methods from the above four control methods and select the desired control method from the adopted control methods It is also possible to perform shooting.

  Further, as described above, the focal plane shutter of the present embodiment is set in the photographing standby state, and the exposure opening (opening portion 1a) is fully open. In the case of a digital camera equipped with a shutter, a movie shooting button can be provided in addition to the release button so that movie shooting can be performed while the movie shooting button is being pressed. Become. These can be said also in the case of a digital camera provided with a focal plane shutter of Example 2 described below.

  Next, Example 2 will be described with reference to FIGS. 14 and 15. FIGS. 14 and 15 are plan views showing the same state as FIGS. 2 and 3 described above. The configuration of the present embodiment is almost the same as that of the first embodiment, and the configuration of the deterring means 41 in the present embodiment is substantially different from the configuration of the deterring means 14 in the first embodiment. It ’s just that. Therefore, in FIGS. 14 and 15, new symbols are attached only to the members constituting the restraining means 41 and the two screws 42 and 43 that attach the restraining means 41 to the shutter base plate 1. The other components and parts are denoted by the same reference numerals as in the first embodiment. Therefore, description of the configuration other than the suppression unit 41 is omitted.

  Therefore, the configuration of the deterring means 41 of this embodiment will be described. The restraining means 41 is an electromagnetic device generally called an electromagnetic plunger. However, in the present embodiment, as in the case of the deterring means 14 of the first embodiment, a role for inhibiting the rotation of the first blade first drive member 16 is given, but a role as a so-called actuator is given. Not. And this suppression means 41 has the cylindrical casing 41a, with respect to the subject side surface of the shutter base plate 1, two mounting portions 41a-1 and 41a-2 integral therewith are attached with two screws. 42 and 43 are attached.

  In addition to the casing 41a, the inhibiting means 41 includes lid members 41b and 41c attached so as to close both ends of the casing 41a, guide members 41d and 41e attached to the lid members 41b and 41c, and A rod-like movable element 41f that is guided by the guide members 41d and 41e so as to be linearly reciprocated, an abutting member 41g that is attached to a substantially central portion of the movable element 41f, and an abutting member thereof A stator frame 41h having an inner peripheral surface opposed to the outer peripheral surface of 41g and attached so as to be in contact with the inner peripheral surface of the casing 41a, and the casing 41a side at a substantially central portion of the stator frame 41h A permanent magnet 41i arranged in the formed annular groove and a coil wound around two grooves formed in the same manner on both sides of the groove 1j, it is composed of a 41k.

  Among these, the mover 41f corresponds to the restraining member of the present invention. The contact member 41g contacts the guide member 41b when the movable element 41f operates to the left, and contacts the guide member 41c when it operates to the right. Therefore, the guide members 41b and 41c also serve as a stopper for the mover 41f. Further, the permanent magnet 41i of this embodiment is ring-shaped and provided on the stator side, and as shown in the drawing, the inner diameter side becomes the S pole and the outer diameter side becomes the N pole. Has been.

  Further, the coils 41j and 41k actuate the mover 41f to the left when energizing only the coil 41j, and actuate the mover 41f to the right when energizing only the coil 41k. In addition, the movable element 41f can keep its stopped state when the coil 41j or 41k is de-energized while the contact member 41g is in contact with the guide member 41d or 41e. In the state where the contact member 41g is stopped by contacting the guide member 41b, the left end of the mover 41f is within the operation locus of the inhibited portion 16c of the first driving member 16 for the leading blade. It comes to come.

  As described above, the present embodiment is only different in the configuration of the suppression unit 41 from the configuration of the suppression unit 14 in the first embodiment. The operation of this embodiment is exactly the same as that of the first embodiment except for the operation of the deterring means 41 as described above. Therefore, regarding the operation of the inhibiting means 41, “inhibiting means (14)” described in each timing chart including FIG. 7 is replaced with “inhibiting means (41)” and “inhibiting means control signal” “ It is only necessary to change “ON-CW” to “coil 41j-ON” and “ON-CCW” to “coil 41k-ON”. Therefore, in order to avoid duplication, detailed description of the operation of this embodiment is omitted.

  In the case of each of the embodiments described above, in the second mode, from the state in which the exposure aperture is fully opened, the electronic control circuit starts photographing exposure by controlling the image sensor, and the shutter blade opens the exposure aperture. The description has been made on the assumption that the photographing exposure is ended by closing. However, in the second mode of the present invention, as is well known, both the start and end of shooting exposure are performed by the electronic control circuit controlling the image sensor from the state where the exposure aperture is fully open. Thereafter, the mode may be such that the exposure opening is closed by the rear blade. In addition, if necessary according to camera specifications, this mode may be adopted in combination with the second mode of the embodiment. As such, when both of them are in the second mode, the number of control methods in the second mode is theoretically increased from 4 to 8 in theory. It will be possible.

1 shutter base plate 1a, 2a, 3a opening 1b, 1c, 28a, 34a hole 1d protrusion 1e, 1f, 24g recess 1g, 1h pillar 1i, 1j, 1k, 1m, 1n, 1p, 1q, 1r shaft 1s, 1t , 1u, 1v Long hole 1w, 1x Spring hook portion 2 Intermediate plate 3 Auxiliary ground plate 3b, 3c Hook portion 4, 5 Buffer member 6 Support plate 7 Auxiliary plate 8, 9, 12, 13, 42, 43 Screw 10 For leading blade Electromagnets 10a, 11a Iron core members 10b, 11b, 41j, 41k Coils 10c, 11c Bobbins 11 Rear blade electromagnets 14, 41 Suppressor 14a Permanent magnet rotor 14b Suppression means 14c First stator frame 14d Second stator frame 14d -1, 14d-2 Stopper part 14e Coil 14f Yoke 15 Flexible printed wiring board 16 Leading blade first drive member 16a, 16 , 17b Driven portion 16c Blocked portion 16d, 20c Drive pin 17 Second driving member for leading blade 17a, 20a, 24b Tube portion 17c, 20b, 41a-1, 41a-2 Mounting portion 17d, 24c, 24d, 24g -1 Pushing part 18, 21 Iron piece member 18a, 21a, 23b, 24a Shaft part 18b, 21b Head part 18c, 21c Iron piece part 19, 22 Compression spring 20 Rear blade drive member 20d Roller 23 Operation member 23a Driven pin 24 Set member 24e, 26c Push pin 24f Contact pin 25 Link member 26 Return member 26a, 26b Projection part 27, 28, 33, 34 Arm 29, 30, 31, 35, 36, 37 Blade 32 Set spring 38 Spring 41a Casing 41b, 41c Lid member 41d, 41e Guide member 41f Movable element 41g Contact member 41h Stator frame 41i Permanent magnet

Claims (13)

A first mode that includes a front blade and a rear blade, starts shooting exposure when the front blade starts to open the exposure opening, and finishes shooting exposure when the rear blade finishes closing the exposure opening, and fully opens the exposure opening. With the focal plane shutter capable of selecting and shooting the second mode in which the electronic control circuit controls the image pickup device with the selection means provided in the camera, the shooting exposure is started. There ,
A shutter base plate erected with a first axis, a second axis, a third axis, and a fourth axis ;
Front blade be linked to the first and the pushing portion and the second target pushing portion has a target suppression unit, a first driving member for rotatably mounted front blade to the first axis and,
Have a first pushing portion, the rotatably mounted on the first shaft, when the first mode is selected is rotated by the biasing force of the front blade driving spring during shooting a second driving member for the first blade to the first pushing portion to open the first both exposure opening in the rotated leading blade first driving member for the front blade press the pressing portion,
A set spring that biases the first drive member for the front blade and the front blade in a set state so that the front blade can operate to a position where the exposure opening is closed ;
Be linked to the trailing blade, said rotatably mounted on the second shaft, a blade driving member after to close the exposure aperture in the rear blades is rotated by the biasing force of the trailing blade driving spring at the time of shooting,
It is rotatably attached to the third shaft and rotates from the initial position to the set position during the set operation to resist the second blade driving member for the leading blade and the driving member for the trailing blade against the urging force of each driving spring. And a set member that returns to the initial position after the rotation button is pressed and the release button provided on the camera is pressed and before the exposure starts ,
Have a second pushing portion, the fourth is mounted so as to rotate in conjunction with the setting member with respect to the axis, during the set operation the first target pushing portion by the urging force of the set spring the second the second pushing portion of the first drive member from its middle for the first in contact with the pressing portion front blade being driven driving member for the first blade pushes the second target pushing portion reversed, when in a set state in which the second pushing portion is suppressed rotation of the first driving member for the first blade to maintain the opened state of the exposure opening by the first blade, the first mode is selected The first driving member for leading blades that is rotated by the biasing force of the set spring during the return operation of the setting member until the first driven portion contacts the first pushing portion of the second driving member for leading blades. the by way until contacting the second target pushing portion to the second pushing portion of the rotary sub And the member back to,
The have out possible countering element in the working locus of the canceling section, operating said attached to the shutter base plate, when the first mode is selected it is該抑stop member of the object preventing part When the second mode is selected when the second member is outside the locus , the restraining member is within the operation locus of the restrained portion and restrains the rotation of the first driving member for the leading blade due to the biasing force of the set spring. Deterrence means ,
A focal plane shutter for a digital camera.   In the set state, the restraining member can enter and exit within the operation locus of the to-be-inhibited portion, and when the second mode is selected and within the operation locus of the to-be-inhibited portion, The rotation of the return member in response to the returning operation to the position receives contact of the to-be-inhibited portion, and thereafter, the rotation of the first driving member for the leading blade is suppressed to maintain the opening state of the exposure opening by the leading blade. The focal plane shutter for a digital camera according to claim 1, wherein the focal plane shutter is for digital cameras. When the second mode is selected, the state in which the restraining member restrains the rotation of the leading blade first drive member is that the leading blade second drive member is moved forward with the return operation of the set member. It is rotated by the urging force of the blade drive spring, and the first pushing portion of the second blade driving member pushes the first pushed portion, thereby resisting the urging force of the set spring. The focal plane shutter for a digital camera according to claim 1 or 2, wherein the focal plane shutter is released by rotating the first driving member for blades.   After the second driving member for leading blades rotated with the return operation of the set member rotates the first driving member for leading blades against the biasing force of the set spring, 4. The focal plane shutter for a digital camera according to claim 3, wherein the focal plane shutter is moved out of the operation locus of the inhibited portion.   5. The focal point for a digital camera according to claim 4, wherein the restraining member is moved out of an operation locus of the restrained portion before the return operation of the set member stops at an initial position. Plane shutter. The first driving member for the leading blade has a position where the leading blade is stopped by opening the exposure opening to bring the first driven portion into contact with the first driving portion of the second driving member for the leading blade. And when the second pushed part is in contact with the second pushed part of the return member and when the inhibited part is in contact with the inhibiting member The focal plane shutter for a digital camera according to any one of claims 1 to 5.   The restraining member and the first driving member for the leading blade are members in which the restraining member is rotatable about an axis perpendicular to the shutter base plate, and the restrained portion is in contact with the restraining member. The focal plane shutter for a digital camera according to any one of claims 1 to 6, wherein a line of action of the current force passes through the axis.   7. The focal plane for a digital camera according to claim 1, wherein the restraining means is an electromagnetic device, and the restraining member is a movable element of the electromagnetic device capable of reciprocating. Shutter.   The said suppression means has an electromagnetic device and the member reciprocated by the needle | mover of this electromagnetic device, This member is used as the said suppression member in any one of Claim 1 thru | or 7 characterized by the above-mentioned. The focal plane shutter for digital cameras described.   8. The suppression device includes an electromagnetic actuator and a member that reciprocates integrally with a mover of the electromagnetic actuator, and the member serves as the suppression member. The focal plane shutter for digital cameras described in 1.   The focal plane shutter for a digital camera according to claim 9 or 10, wherein the movable element is a rotor.   A digital camera comprising the focal plane shutter for a digital camera according to claim 1.   In addition to the release button, a moving image shooting button is provided. When the moving image shooting button is pressed while the digital camera focal plane shutter is set, moving image shooting can be performed while the moving image shooting button is being pressed. The digital camera according to claim 12, wherein

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