JP2007034042A - Focal plane shutter for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a focal plane shutter for a camera, the focal plane shutter being of a lock type designed to restrain and stop bound when a hold member is operated into an held position prior to an exposure operation and consequently brought into contact with a stopper. <P>SOLUTION: A tube shaft member 28 and a cylindrical member 29 are rotatably attached to a shaft 6h on an upper base plate 6. A hold member 26 is rotatably attached to the tube shaft member 28 and the hold auxiliary member 27 is integrally attached to the tube shaft member 28. The one end of a connection spring 31 is connected to the shaft 26a of the hold member 26, and the other end to the hold auxiliary member 27. The connection spring 31 is pressed such that the hold auxiliary member 27 is rotated to bring its abutting part 27a into contact with the shaft 26a. Also, the torsion of a wind core axis always acts so that part of the spring may press the cylindrical member 29 in a radial direction and other part may press the tube shaft member 28 in a radial direction. One end of a separating spring 32 is connected to the upper base plate 6 and the other end to the hold auxiliary member 27, and the separating spring 32 is pressed to rotate them. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a focal plane shutter for a camera used in a silver salt film camera or a digital camera.

  In the focal plane shutter for a camera, two blade chambers are formed between three plate members called a shutter base plate, an intermediate plate, and an auxiliary base plate. Are arranged separately, and outside the blade chamber, the front blade driving member and the rear blade driving member are attached to the shutter base plate, and the front blade and the rear blade are operated by them. What is made is known. This type of focal plane shutter is used in both silver salt film cameras and digital cameras. In addition, one shutter blade is disposed in the blade chamber formed between the shutter base plate and the auxiliary base plate, and one driving member attached to the shutter base plate exposes the shutter blade at the exposure opening at the end of photographing. However, this type of focal plane shutter is used only for digital cameras.

  In these focal plane shutters, each of the drive members is rotated by the biasing force of the drive spring at the time of photographing, and is rotated against the biasing force of the drive spring by the set member at the time of setting. Therefore, at least immediately before the start of photographing, the drive member is held against the biasing force of the drive spring by some means at the exposure operation start position, and the holding force is The operation can be started by being released. The holding method at the exposure operation start position is known to have a configuration called a locking type and a configuration called a direct type. The focal plane shutter is a locking type focal plane shutter.

  The locking-type focal plane shutter that is the subject of the present invention is usually connected to one or two shutter blades that open and close the exposure opening, and the shutter blades that are connected to the shutter blades by the urging force of the drive spring during photographing. One or two drive members that are actuated from the set position along with a set member that actuates the drive member to the set position against the urging force of the drive spring with the shutter blades after photographing, and a drive member One or two locking members that lock against the biasing force of the drive spring at the set position, and one or two locking release members that release the locking of the driving member by the locking member at the time of shooting, One or two electromagnets that first hold the unlocking member at the time of shooting, then release the holding and release the latching of the drive member by the locking member, and the set state Oite are those with a, and a hold member for separating the locking release member is attracted and held by the electromagnet when shooting have contacted the unlocking member to the electromagnet from the locking release member. Patent Document 1 below describes a focal plane shutter having two each of these shutter blades, drive members, and locking members. Patent Document 2 below describes a configuration of an unlocking mechanism having the above-described two unlocking members, two electromagnets, and a holding member.

  By the way, as is well known, some focal plane shutters have shutter blades that operate from the upper side to the lower side of the exposure opening and those that operate from the lower side to the upper side during photographing. For this reason, the focal plane shutter described in Patent Document 1 is described as operating from below to above, and the unlocking mechanism described in Patent Document 2 is described as operating from above. However, the lock release mechanism described in Patent Document 2 is also used as it is in the focal plane shutter described in Patent Document 1, if the order of cutting off the current to the two electromagnetic coils is reversed during shooting. It is possible to do.

  The locking release mechanism described in Patent Document 2 is specifically configured as follows. In the set state, the hold plate (15) brings the iron pieces (4a, 7a) of the two iron piece levers (4, 7) into contact with the iron core portions of the two electromagnet coils (2, 3). When the release button is pressed at the time of photographing, first, the electromagnet coils (2, 3) are energized to attract and hold the iron pieces (4a, 7a), and then the second hold by the release lever (16). Release the lever (12). Therefore, the two hold levers (10, 12) are rotated by the urging force of the spring (13), the hold plate (15) is separated from the iron piece levers (4, 7) and contacts the two stoppers (18, 18). Stop by touching. Thereafter, the energization of the electromagnet coils (2, 3) is sequentially cut off at predetermined time intervals, whereby the iron levers (4, 7) are rotated by the biasing force of the separating springs (6, 9), and the bosses (4b, 4b, According to 7b), the locking of each driving member by the two locking members is released.

  In Patent Document 2, two electromagnets are configured to share one iron core member (iron core 1). In practice, however, the iron cores are separately provided. Is normal. Moreover, although the latch release mechanism of patent document 2 is comprised as a latch release mechanism for focal plane shutters provided with two shutter blades, it has two electromagnetic coils (2, 3) and two iron pieces. If the levers (4, 7) are made one by one (for example, the electromagnet coil 2 and the iron piece lever 4), the locking release mechanism for the focal plane shutter having only one shutter blade is provided.

JP 2002-139769 A Japanese Utility Model No. 4-3301

  As is well known, a camera equipped with a focal plane shutter is a high-end camera and is used by professional photographers and many camera enthusiasts. For this reason, when shooting a moving subject, it is required to be able to shoot at a higher speed (shorter exposure time) and more images can be taken in a shorter time than a middle-class machine such as a compact camera. . However, looking at the focal plane shutter locking release mechanism configured as described above from such a point of view, there is a point that requires some contrivance.

  That is, in the above-described unlocking mechanism, when the shutter button of the camera is pressed during shooting, the electromagnetic coils (2, 3) are energized, and then the hold levers (10, 12) are engaged by the release lever (16). The stop is released and the hold plate (15) is rotated until it comes into contact with the stopper (18, 18). In this configuration, when the hold plate (15) comes into contact with the stopper (18, 18), it bounces and temporarily returns to the operating locus of the iron lever (4, 7). Therefore, in order to avoid the open iron lever (4) from hitting the hold plate (15) during operation, the energization to the electromagnetic coil (2) should be cut off after waiting for such a bounce to stop. Yes. Therefore, if the bounce can be suitably suppressed, it is possible to shorten the time from when the shutter button of the camera is pressed until the actual shooting is started, thereby missing the photo opportunity. There is no fear, and it is possible to speed up the start of the next shooting.

  Further, in the case of a focal plane shutter having only one shutter blade, it is used only in a digital camera, and actual shooting is started by discharging charges accumulated in a solid-state image sensor. The shutter blades are configured to be closed at the end of photographing. Therefore, in this case, it is not impossible to start actual shooting immediately after pressing the shutter button of the camera. However, in such a case, the shutter blade cannot be closed without waiting for the above bounce to stop, so the maximum exposure time (shortest exposure time) that can be taken is shortened. Can not do. Such a thing is not allowed for high-end cameras. Therefore, in this case as well, in consideration of the timing at which such a bounce stops, the electric charge accumulated in the solid-state imaging device must be discharged, and actual photographing must be started. Therefore, even in the case of a focal plane shutter having only one shutter blade, if the bounce can be suitably suppressed, it is possible to shorten the time from when the shutter button of the camera is pressed until the actual shooting is started. Thus, there is no possibility of missing a photo opportunity, and it is possible to start the next shooting earlier.

  The present invention has been made in order to solve such problems, and the object of the present invention is to lock the driving member by the locking member in the set state, and to release the locking member at the time of photographing. In the so-called locking-type focal plane shutter that is unlocked by the shutter and actuates the shutter blade, in the set state, the holding means that maintains the unlocking member in contact with the electromagnet When the camera is moved to the hold position during shooting, bounce is suppressed even if it comes into contact with the stopper, thereby shortening the time from when the shutter button of the camera is pressed until actual shooting is started. The focal point for the camera eliminates the possibility of missing a photo opportunity and allows the next shooting to be started early. It is to provide a Nshatta.

  In order to achieve the above object, a focal plane shutter for a camera according to the present invention includes one or two drive members that rotate by a biasing force of a drive spring from a set position with a shutter blade at the time of photographing, and the drive member. One or two locking members to be locked at the set position, one or two electromagnets having an iron core member and a coil, and the coil in contact with the iron core member in the set state. When the current is interrupted after being attracted to and held by the iron core member by energizing to one, the biasing force of the release spring separates the iron member from the iron core member, It has two lock release members and a hold part. In the set state, the lock release member is pressed by the hold part to come into contact with the iron core member and is released at the time of shooting. A holding member that is rotated until it comes into contact with the stopper by the biasing force of the spring and a connecting spring that biases the holding member to rotate in opposite directions are hung. After the holding member is rotated against the urging force of the separating spring and the iron piece member comes into contact with the iron core member, the connecting spring is tensioned and rotated to the set position. A holding auxiliary member that is rotated by the urging force of the separation spring together with the holding member after rotation, and in the set state, the holding auxiliary member is locked at the set position. A release member that releases the locking, and the hold member and the hold auxiliary member are pipes that are rotatable about a fixed shaft. One is integrally attached to the member so that the other is rotatable, and the connection spring is a torsion coil spring, and the coil portion includes a cylindrical member attached to the fixed shaft and the tube. It is fitted so that it can come into contact with both of the shaft members.

  In that case, two each of the drive member, the locking member, the electromagnet, and the locking release member are provided, and the hold portion is a pressing member attached to the hold member, In the set state, when the two unlocking members are pressed by the pressing member and each iron piece member is brought into contact with each iron core member, the focal plane having two shutter blades is provided. The configuration is extremely suitable as a shutter.

  In the set state, the lock release member is in contact with the electromagnet in the set state, and is rotated in the opposite direction between the hold member and the hold member that are rotated until the contact with the stopper by the biasing force of the separation spring at the time of shooting. The holding auxiliary member with the connecting spring that is biased so as to be engaged with the tube shaft member that is rotatably attached to the fixed shaft, and one is integrated and the other is rotatably attached In the locking-type focal plane shutter having the locking release mechanism, the connecting spring is a torsion coil spring, and the coil portion is both a tubular member and a tube shaft member attached to a fixed shaft. The inner wall of the tube shaft member is pressed in the radial direction with respect to the fixed shaft by torsion of the connecting spring, so that the tube at the time of photographing is Rotation of the member is adapted to be suitably braked. For this reason, when the hold member comes into contact with the stopper, the bounce is suppressed and preferably stopped. Therefore, the time from when the shutter button is pressed until the actual shooting starts can be shortened, and the chance of taking a photo is lost. And the next shooting can be started early.

  Embodiments of the present invention will be described with reference to the illustrated examples. The focal plane shutter of this embodiment has two shutter blades and can be used for a silver salt film camera or a digital camera. However, for convenience of explanation, the focal plane shutter is used for a digital camera. It will be explained on the assumption of.

  First, the structure of a present Example is mainly demonstrated using FIGS. 1-4. 1 and 2 are plan views showing the set state (photographing standby state) of the present embodiment as viewed from the subject side, but FIG. 1 is mainly for explaining the shutter blade opening / closing drive mechanism. FIG. 2 shows a half of the left side of the shutter, and FIG. 2 mainly shows an unlocking mechanism of the opening / closing drive mechanism. 2 is originally attached to the opening / closing drive mechanism shown in FIG. 1 in an overlapping manner from the subject side. Is difficult to see, so it is shown in two parts. Therefore, in order to make the relationship between the two easy to understand, some constituent members are shown in both. FIG. 3 is an enlarged side view showing a part of the locking release mechanism, and FIG. 4 is a view for explaining the rotational positional relationship of the pressing member with respect to the hold member that is a constituent member of the locking release mechanism. FIG.

  In FIG. 1, a shutter base plate 1 has an opening 1a for a photographing optical path having a rectangular shape that is horizontally long at a substantially central portion thereof. Further, an intermediate plate 2 and an auxiliary base plate 3 are sequentially attached to the rear side of the shutter base plate 1 with a predetermined interval therebetween, and a blade chamber for a rear blade described later is formed between the shutter base plate 1 and the intermediate plate 2. In addition, a blade chamber of a leading blade described later is formed between the intermediate plate 2 and the auxiliary base plate 3. The intermediate plate 2 and the auxiliary base plate 3 are also formed with openings 2a and 3a having similar shapes where they overlap the opening 1a, but the exposure opening is regulated by the opening 1a. It has become. Further, two arc-shaped long holes 1b and 1c are formed on the left side of the opening 1a. Then, rubber cushioning members 4 and 5 having a substantially C-shaped planar shape are attached to the upper ends of the long holes 1b and 1c.

  The subject side of the shutter base plate 1 is a two-story building, and a middle second floor is provided between the first and second floors. In other words, the upper base plate 6 is attached to the shafts 1 d, 1 e, and 1 f erected on the subject side surface of the shutter base plate 1 with a predetermined distance from the shutter base plate 1. In FIG. 1, only the outer shape of the upper base plate 6 is shown by a two-dot chain line, and in FIG. 2, the actual shape is shown by a solid line. As shown in FIG. 2, the cover plate 7 is parallel to the shafts 6 a and 6 b erected on the subject-side surface of the upper base plate 6 with a predetermined distance from the upper base plate 6. The cover plate 7 is indicated by a two-dot chain line in FIG. Further, two shafts that are not clearly defined are erected on the surface of the shutter base plate 1 on the subject side, and the top base plate 6 is connected to the tip surface of these shafts between the shutter base plate 1 and the shaft. A shelf board 8 having a small area is attached with two screws 9 and 10 as shown in FIG. The shelf 8 is provided with a bent portion 8a bent on the upper base plate 6 side, and a shaft 8b is erected.

  In addition to the shafts 1d, 1e, and 1f, shafts 1g, 1h, 1i, and 1j are further erected on the subject side surface of the shutter base plate 1 as shown in FIG. Of these, the shafts 1g and 1h penetrate the shutter base plate 1 and are also erected on the back side. In addition to the shafts 1g and 1h, shafts 1k and 1m are also erected on the back side of the shutter base plate 1, that is, the surface on the solid-state imaging device side.

  A leading blade drive member 11 is rotatably attached to the shaft 1g on the subject side of the shutter base plate 1 and is rotated counterclockwise by a leading blade drive spring (not shown). A part of the arrangement is inserted between the shutter base plate 1 and the shelf board 8 by the rotation thereof. The leading blade drive member 11 has a locked portion 11a, a roller 11b is rotatably attached to the subject side surface, and a drive pin 11c is provided on the back side. The drive pin 11c passes through the long hole 1b of the shutter base plate 1 and is connected to the leading blade in the blade chamber. The configuration of the leading blade will be described later.

  Further, on the subject side of the shutter base plate 1, a rear blade drive member 12 is rotatably attached to the shaft 1h, and is rotated counterclockwise by a rear blade drive spring (not shown). Is being energized. This rear blade drive member 12 has a locked portion 12a, a roller 12b is rotatably attached to the subject side surface, and a drive pin 12c is provided on the back side. The drive pin 12c passes through the long hole 1c of the shutter base plate 1 and is connected to the rear blade in the blade chamber. The configuration of the rear blade will be described later.

  A set member 13 is rotatably attached to the shaft 1j of the shutter base plate 1, and is urged to rotate clockwise by a spring (not shown). The set member 13 has a driven portion 13a. On the surface of the shutter base plate 1 side, a roller 13b that can contact the roller 11b of the leading blade driving member 11 and the rear member are provided. A roller 13c that can contact the roller 12b of the blade drive member 12 is attached.

  A set operation member 14 is rotatably attached to the shaft 8b of the shelf board 8. The set operation member 14 has two rollers 14a and 14b attached to the surface on the shutter base plate 1 side, and a roller 14c attached to the surface on the upper base plate 6 side. The set operation member 14 itself is not given a rotational force by a spring. Therefore, in FIG. 1, the set operation member 14 is configured such that the roller 14 b is pushed by the driven portion 13 a and is rotated counterclockwise by the force of the spring urging the set member 13. The bent portion 8a of the plate 8 is in a state of being blocked. In the plan view showing the unlocking mechanism including FIG. 2, only the mounting portion of the roller 14 a and the roller 14 c are shown for the set operation member 14 in order to make the drawing easy to see.

  A front blade locking member 15 is rotatably attached to the shaft 1i of the shutter base plate 1 and is urged to rotate counterclockwise by a spring (not shown). The leading blade locking member 15 has a locking portion 15 a bent toward the shutter base plate 1, but in FIG. 1, the locking portion 15 a is a locked portion of the leading blade drive member 11. 11a is latched to prevent the leading blade drive member 11 from rotating counterclockwise. Further, the leading blade locking member 15 has a driven portion 15b which protrudes further to the upper base plate 6 side at the left end of the bent portion bent to the upper base plate 6 side. 15b is inserted into a long hole (not shown) formed in the set operation member 14, and is further inserted into a square hole 6c (see FIG. 2) of the upper base plate 6, so that the gap between the upper base plate 6 and the cover plate 7 is increased. It is arranged. In addition, since the illustration of the long hole which is formed in the set operation member 14 and inserts the driven portion 15b of the locking member 15 for the leading blade is omitted, FIG. 1, FIG. 7, FIG. 12 and 13, for the leading blade locking member 15, the pushed portion 15b is indicated by a solid line.

  A rear blade locking member 16 is rotatably attached to the shaft 1f to which the upper base plate 6 is attached, and is urged to rotate counterclockwise by a spring (not shown). . The rear blade locking member 16 has a locking portion 16a bent to the shutter base plate 1 side and a driven portion 16b having a shape bent to the upper base plate 6 side. In FIG. 1, the locking portion 16 a locks the locked portion 12 a of the trailing blade driving member 12 and prevents the trailing blade driving member 12 from rotating counterclockwise. Further, as shown in FIG. 2, the driven portion 16 b is inserted into a bobbin-shaped hole 6 d formed in the upper base plate 6 and protrudes between the upper base plate 6 and the cover plate 7.

  As shown in FIG. 2, the upper base plate 6 includes two bent portions 6e and 6f formed so as to be in a straight line. The upper base plate 6 is stepped at the bent portions 6e and 6f, and the right side surface is closer to the shutter base plate 1 than the left side surface. In addition, although it is difficult to understand in the drawing and is not labeled, a relatively large opening is formed in the upper and lower intermediate regions of the bent portions 6e and 6f mainly on the left side. Yes. Two electromagnets 17 and 18 are attached to the top plate 6 having such a shape by screws 20 and 21. The electromagnets 17 and 18 include U-shaped iron core members 17a and 18a and bobbins 17c and 18c wound with coils 17b and 18b. The bobbins 17c and 18c are one of the iron core members 17a and 18a. It is fitted on the leg. These bobbins 17c and 18c have a portion of the upper base plate 6 side inserted into the opening, and as can be seen from FIG. 7 restraining part 7a.

  A front blade release member 22 and a rear blade release member 23 are rotatably attached to the shafts 6a and 6b that are erected on the upper base plate 6 and have cover plates attached thereto, respectively. Due to the biasing force of the release spring, the leading blade release member 22 is biased counterclockwise and the trailing blade release member 23 is biased clockwise. The leading blade release member 22 includes a pushing portion 22a that pushes the driven portion 15b of the leading blade locking member 15, and an iron piece member 24 is provided at the bent portion formed at the tip. It is attached. The rear blade release member 23 includes a pushing portion 23a that pushes the pushed portion 16b of the rear blade locking member 16, and an iron piece member 25 is provided at the bent portion formed at the tip. It is attached. And these iron piece members 24 and 25 have the to-be-driven parts 24a and 25a which protruded on the right side of the bending part to which they are attached. In the present embodiment, the iron piece members 24 and 25 are separate members from the release members 22 and 23, but may be integrated.

  A shaft 6h is erected on the upper base plate 6, and a hold member 26 and a hold auxiliary member 27 are rotatably attached thereto from the upper base plate 6 side. And will be described with reference to FIG. As shown in FIG. 3, a tube shaft member 28 and a tubular member 29 are rotatably attached to the shaft 6h of the upper base plate 6. The tubular member 29 can be rotated by an appropriate method such as press fitting. It does not matter even if it is fixed. The hold auxiliary member 27 is fixed to such a tube shaft member 28, but the hold member 26 is rotatably attached with a washer 30 interposed between the hold auxiliary member 27 and the hold auxiliary member 27. However, in this embodiment, it is configured as described above, but it is also conceivable that the hold member 26 is fixed and the hold auxiliary member 27 is rotatably attached.

  A connecting spring 31 is hung between the hold member 26 and the hold auxiliary member 27. In FIG. 2, the hold member 26 is rotated clockwise and the hold auxiliary member 27 is rotated counterclockwise. The connection spring 31 is a torsion coil spring, and the coil portion is fitted so as to be able to come into contact with both the tube shaft member 28 and the tubular member 29, and one arm portion is held. The other arm part is hung on the bent part 27b (see FIG. 2) of the holding auxiliary member 27. The biasing force by which the connecting spring 31 relatively rotates the hold member 26 and the hold auxiliary member 27 is that the contact portion 27a of the hold auxiliary member 27 contacts the large diameter portion of the shaft 26a of the hold member 26. Is supposed to be lost.

  By the way, as can be seen from FIG. 2, the connecting spring 31 is attached in a state in which the winding core is tensioned and the winding core is twisted, so that a part of the upper base plate 6 side pushes the tube shaft member 28 in the radial direction, The part on the 7 side is in a state of pushing the cylindrical member 29 in the radial direction. Therefore, the contact pressure between the inner peripheral surface of the tube shaft member 28 and the outer peripheral surface of the shaft 6h is not substantially the same over the entire periphery, and a part of the inner peripheral surface of the tube shaft member 28 is at a predetermined peripheral position. The shaft 6h is pressed by a part of the outer peripheral surface. That is, in FIG. 2, the radial force due to the torsion of the coupling spring 31 acts on the shaft 6 h to push the tube shaft member 28 from the right direction to the left direction. It does not act to push 28 from left to right. Therefore, the tube shaft member 28 is pushed substantially leftward as a whole with respect to the shaft 6h.

  As can be seen from the description of operation described later, when the tube shaft member 28 does not rotate with the hold member 26 and rotates within a limited rotation angle with the hold auxiliary member 27, the tension of the coupling spring 31 is slightly increased. In this case as well, the position pressed in the radial direction only slightly shifts in the rotational direction, and a part of the inner peripheral surface of the tube shaft member 28 is formed on the shaft 6h. The state of being forced to press against a part of the outer peripheral surface does not change. Therefore, when the tube shaft member 28 rotates not only with the hold assisting member 27 but also with the hold member 26, a part of the outer peripheral surface of the shaft 6h and the tube shaft member 28 are caused by such radial pressing force. A moderate frictional force is generated between a part of the inner peripheral surface and acts as a braking force against the rotation of the tube shaft member 28.

  Further, as shown in FIG. 3, the hold member 26 is urged to rotate counterclockwise in FIG. 2 by a separation spring 32 loosely fitted around the tube shaft member 28. Yes. The separation spring 32 may be directly applied to the hold member 26, but this is not the case in this embodiment. That is, the separation spring 32 is a torsion coil spring. In this embodiment, one arm portion is hung on the edge of the upper base plate 6 and the other arm portion is a bent portion 27c of the holding auxiliary member 27. (See FIG. 2). Therefore, the hold member 26 is rotated counterclockwise in FIG. 2 when the contact portion 27a of the hold auxiliary member 27 biased by the separation spring 32 pushes the shaft 26a. On the other hand, the hold auxiliary member 27 has a distal end side from the bent portion 27c arranged on the back side of the upper base plate 6, and a bent portion is provided at the distal end located on the left side of the upper base plate 6. A part thereof extends to the cover plate 7 side from the upper base plate 6 to form a locked portion 27d.

  Next, the mounting configuration of the pressing member 33 with respect to the hold member 26 will be described mainly with reference to FIGS. 3 and 4. As shown in FIG. 4, the hold member 26 has a hole 26b for attaching to the tube shaft member 28 and a hole 26c for erecting the shaft 26a. A shaft 26d is erected, and a stopper 26e is provided at the lower end thereof. In addition to the two pressing pieces 33a and 33b, the pressing member 33 rotatably attached to the shaft 26d has an abutting portion 33c bent to the operating surface side of the holding member 26.

  The two pressing pieces 33a and 33b provided on the pressing member 33 are driven parts 24a and 25a of the iron piece members 24 and 25 attached to the leading blade releasing member 22 and the trailing blade releasing member 23, respectively. To press the iron pieces 24 and 25 against the iron core members 17a and 18a of the electromagnets 17 and 18. Further, the stopper portion 26e and the contact portion 33c are for preventing the pressing member 33 from rotating with respect to the holding member 26, and when the pressing member 33 rotates counterclockwise from the state of FIG. As shown in FIG. 4 (c), when the abutting portion 33c abuts on the stopper portion 26e and stops and rotates clockwise, as shown in FIG. 4 (d), the abutting portion The portion 33c comes into contact with the end surface of the hold member 26 and stops.

  A shaft 6i is erected on the upper base plate 6, and a release member 34 disposed on the cover plate 7 side of the leading blade release member 22 and the hold member 26 is rotatably attached thereto. Although it is urged to rotate counterclockwise by a spring (not shown), in the state shown in FIG. 2, its rotation is blocked by a stopper (not shown). The release member 34 includes a locking portion 34a for locking the locked portion 27d of the hold auxiliary member 27 and an operation portion that is bent and protrudes to the right side of the upper base plate 6. 34b. The cover plate 7 is attached to the shafts 6a and 6b as described above, and two holes that are not labeled are fitted to the small diameter portion at the tip of the shaft 6i and the tip of the shaft 6h. In addition, an elongated stopper portion 7b bent toward the upper base plate 6 is provided at the right position in FIG.

  Finally, the configuration of the leading blade and the trailing blade disposed in each blade chamber will be described. First, as shown in FIG. 1, the leading blade has two arms 35, 36 pivoted on two shafts 1 g, 1 k erected on the shutter base plate 1, and toward their tips. The blades 37, 38 and 39 are pivotally supported in order, and the blades 39 are used as slit forming blades. Further, the driving pin 11 c of the leading blade driving member 11 is fitted into a well-known hole formed in the arm 35. On the other hand, the rear blade is arranged so that the front blade is turned upside down, and two arms 40 and 41 pivotally attached to two shafts 1h and 1m standing on the shutter base plate 1, and their tips The three blades 42, 43, and 44 are pivotally supported in order toward the blade, and the blades 44 are used as slit forming blades. Further, the drive pin 12 c of the rear blade drive member 12 is fitted into a well-known hole formed in the arm 40.

  Next, the operation of this embodiment will be described. 1 and 2 show the set state of this embodiment. At this time, the set member 13 is rotated clockwise by a biasing force of a spring (not shown), and the set operation member 14 is rotated counterclockwise by pushing the roller 14b as described above. By contacting the bent portion 8a of the shelf board 8, the state shown in FIG. 1 is maintained. For the set member 13 and the set operation member 14, the position in this state is the initial position. In this set state, the rollers 13 b and 13 c of the set member 13 are located outside the operating range of the rollers 11 b and 12 b of the leading blade driving member 11 and the trailing blade driving member 12.

  Further, in this set state, the leading blade driving member 11 resists the urging force of the leading blade driving spring (not shown) so that the locked portion 11a is locked to the locking portion 15a of the leading blade locking member 15. The trailing blade driving member 12 is engaged with the locking portion 12a by the locking portion 16a of the trailing blade locking member 16 against the biasing force of a trailing blade driving spring (not shown). It has been stopped. As a result, the leading blade connected to the driving pin 11c of the leading blade driving member 11 is maintained in a state where the three blades 37, 38, 39 are unfolded and the opening 1a is covered, and the trailing blade is used. The rear blade connected to the drive pin 12c of the drive member 12 is maintained in a state where the three blades 42, 43, 44 are overlapped and stored at a position below the opening 1a.

  Further, at this time, as shown in FIG. 2, the hold assisting member 27 has its locked portion 27 d locked to the locking portion 34 a of the release member 34. Therefore, as shown in FIG. 3, the separation spring 32 that is loosely fitted to the tube shaft member 28, has one end hung on the upper base plate 6, and the other end hung on the bent portion 27 c of the hold auxiliary member 27, I am nervous. At this time, the pressing member 33 attached to the hold member 26 has the pressing pieces 33a and 33b covered by the iron piece members 24 and 25 attached to the leading blade release member 22 and the trailing blade release member 23. The pushing portions 24a and 25a are pushed and pressed against the iron core members 17a and 18a of the electromagnets 17 and 18. In this state, the contact portion 27 a of the hold auxiliary member 27 is separated from the shaft 26 a of the hold member 26. Therefore, the connecting spring 31 that is fitted to both the tube shaft member 28 and the tubular member 29, has one end hung on the shaft 26a of the hold member 26, and the other end hung on the bent portion 27b of the hold auxiliary member 27 is also tensioned. Has been.

  In such a set state, when the release button of the camera is pressed, the leading blade first starts the opening operation of the opening 1a, and after a predetermined time, the trailing blade starts the closing operation, and the normal daylight shooting is started. In this case, a slit is formed by the slit forming blade 39 of the leading blade and the slit forming blade 44 of the trailing blade, and the imaging surface of the solid-state imaging device is continuously exposed. For the sake of convenience, a case will be described where the leading blade opens the opening 1a and then the trailing blade starts closing the opening 1a.

  In this state, when the release button of the camera is pressed, first, current is supplied to the coils 17b and 18b of the two electromagnets 17 and 18 shown in FIG. Therefore, the iron piece member 24 attached to the leading blade release member 22 and the iron piece member 25 attached to the rear blade release member 23 are attracted and held by the iron core members 17a and 18a of the electromagnets 17 and 18. . Thereafter, when the operation portion 34b of the release member 34 is pushed by a member on the camera body side, the release member 34 rotates clockwise against a biasing force of a spring (not shown) and is engaged by the locking portion 34a. The locking of the stop portion 27d is released. Therefore, the hold auxiliary member 27 is counterclockwise by the urging force of the connecting spring 31 that is hung between the hold member 26 and the urging force of the separation spring 32 that is hung between the upper base plate 6. Rotated.

  When the abutment portion 27a of the hold assist lever 27 abuts on the shaft 26a of the hold member 26, the rotational force by the connecting spring 31 is lost, and thereafter, both the hold member 26 and the hold assist member 27 are separated. The pressing pieces 33a and 33b of the pressing member 33 attached to the hold member 26 are rotated from the driven parts 24a and 25a of the iron piece members 24 and 25 by being rotated counterclockwise only by the urging force of the spring 32. Go away. By the way, as described in detail in the above description of the configuration, when the hold member 26 and the hold auxiliary member 27 rotate together, the tube shaft member 28 is moved by the urging force in the radial direction due to the twist of the connecting spring 31. Since a part of the peripheral surface is rotated while being forcedly pressed against a part of the outer peripheral surface of the shaft 6h, an appropriate braking force acts on the rotation. Therefore, in the case of the present embodiment, when the pressing member 33 comes into contact with the stopper portion 7b of the cover plate 7, the bounce is suitably suppressed and a stationary state can be obtained early. FIG. 5 shows a state in which the hold member 26 is stopped as described above.

  Thus, in the case of the present embodiment, since the bounce of the hold member 26 is suppressed and the stationary state is obtained at an early stage, the energization to the coil 17b of the leading blade electromagnet 17 is cut off earlier than in the conventional case. Can do. When the energization of the coil 17b is cut off by a signal from the exposure control circuit, the leading blade release member 22 is rotated counterclockwise by the biasing force of a spring (not shown), and the pushing portion 22a is moved forward. By pushing the driven portion 15b of the blade locking member 15, the leading blade locking member 15 is rotated in the clockwise direction against the biasing force of a spring (not shown). Therefore, the locking portion 15 a of the leading blade locking member 15 unlocks the locked portion 11 a of the leading blade driving member 11. At this time, the pressing force of the member on the camera body side against the operation portion 34b of the release member 34 is also released, and the release member 34 is rotated counterclockwise by the biasing force of a spring (not shown), The portion 34 a is in contact with the locked portion 27 d of the hold auxiliary member 27. This state is the state shown in FIG.

  When the locking by the leading blade locking member 15 is released in this way, the leading blade driving member 11 is rapidly countered from the state of FIG. 1 by the biasing force of the leading blade driving spring (not shown). It can be rotated clockwise. Therefore, the three blades 37, 38, and 39 of the leading blade operate above the opening 1a while increasing the overlap between adjacent blades, and open the opening 1a from below the opening 1a. When the opening 1a is fully opened, the leading blade driving member 11 is stopped immediately after the driving pin 11c comes into contact with the buffer member 4 attached to the upper end of the long hole 1b. The three blades 37, 38, and 39 are overlapped to be stored at a position above the opening 1a. FIG. 7 shows the state at that time.

  When the leading blade fully opens the opening 1a, the energization to the coil 18b of the electromagnet 18 for the trailing blade is subsequently cut off. As a result, the rear blade release member 23 is rotated in the clockwise direction by a biasing force of a spring (not shown) and the pushed portion 23b of the rear blade locking member 16 is pushed by the pushing portion 23a. Therefore, the rear blade locking member 16 is rotated in the clockwise direction against the urging force of a spring (not shown), and the locking portion 16 a of the locked portion 12 a of the rear blade driving member 12 is rotated. Unlock. This state is the state shown in FIG.

  When the rear blade locking member 16 is unlocked in this way, the rear blade driving member 12 is rapidly countered from the state of FIG. 7 by the biasing force of the rear blade driving spring (not shown). It can be rotated clockwise. Therefore, the three blades 42, 43, and 44 of the rear blade operate into the opening 1a while reducing the overlap between adjacent blades, and close the opening 1a from below the opening 1a. When the opening 1a is completely closed, immediately after that, the drive member 12 for the trailing blade is stopped by the drive pin 12c coming into contact with the buffer member 5 attached to the upper end of the long hole 1c. FIG. 9 shows a state in which the exposure operation by the leading blade and the trailing blade is completed in this way, and the three blades 42, 43, and 44 of the trailing blade are in the developed state and close the opening 1a. It is a thing.

  When shooting is completed, the set operation is performed next. In this case, in this embodiment, the set operation member 14 is rotated clockwise by the roller 14a being pushed by a member on the camera body side (not shown). Therefore, on the one hand, the holding auxiliary member 27 is rotated clockwise in FIG. 8 by the roller 14c of the setting operation member 14, and on the other hand, the setting member 13 is counterclockwise in FIG. 9 by the roller 14b of the setting operation member 14. Rotated in the direction. Although the rotation of the hold assist member 27 and the set member 13 is performed substantially simultaneously in parallel, the hold assist member 27 will be described for convenience of explanation.

  As described above, in the state shown in FIG. 9, when the set operation member 14 is rotated clockwise, the roller 14 c pushes the hold auxiliary member 27 and rotates it clockwise. Since the urging force of the coupling spring 31 is greater than the urging force, both the hold member 26 and the hold assisting member 27 resist the urging force of the separation spring 32 while keeping the shaft 26a and the contact portion 27a in contact with each other. Thus, from the state shown in FIG.

  During this clockwise rotation, the hold assisting member 27 has its locked portion 27d in sliding contact with the left end surface of the locking portion 34a of the release member 34, but the hold member 26 is moved forward by the pressing member 33. The pushed portions 24a and 25a of the iron piece members 24 and 25 attached to the blade release member 22 and the rear blade release member 23 are pressed, and the leading blade release member 22 is subjected to a spring biasing force (not shown). The rear blade release member 23 is rotated counterclockwise against a biasing force of a spring (not shown). Moreover, since the force pushed by the pushing portions 22a and 23a of the release members 22 and 23 is released accordingly, the leading blade locking member 15 and the trailing blade locking member 16 are also respectively provided. Is rotated counterclockwise by a biasing force of a spring (not shown). And the state in which the iron piece members 24 and 25 attached to the leading blade release member 22 and the trailing blade release member 23 are in contact with the iron core members 17a and 18a of the electromagnets 17 and 18 in a normal posture. It is shown in FIG.

  When the state shown in FIG. 10 is reached, the contact between the pushing portions 22a and 23a of the two release members 22 and 23 and the pushed portions 15b and 16b of the two locking members 15 and 16 has already been released. The rotation of the two locking members 15 and 16 is stopped when the driven portions 15b and 16b come into contact with the left edges of the holes 6c and 6d of the upper base plate 6, respectively. When the hold assisting member 27 is further rotated in the clockwise direction from the state shown in FIG. 10, the hold member 26 further rotates due to the iron piece members 24 and 25 coming into contact with the iron core members 17a and 18a. Since the contact portion 27a of the hold assisting member 27 is separated from the shaft 21a of the hold member 26, the connecting spring 31 is tensioned in addition to the separation spring 32.

  Immediately thereafter, the sliding contact relationship between the locked portion 27d of the hold assisting member 27 and the locking portion 34a of the release member 34 is released, so that the release member 34 is moved by a biasing force of a spring (not shown). By slightly rotating counterclockwise and coming into contact with a stopper (not shown), the hold auxiliary member 27 can be locked. FIG. 11 shows the moment when the lockable state is reached, but in reality, the hold assisting member 27 is further rotated, so that the release operation member 34 is set by the set operation member 14 as described later. When the operation is finished and the counterclockwise movement is completed, the locked portion 27d of the hold assisting member 27 is locked by the locking portion 34a.

  On the other hand, when the set operation member 14 is rotated clockwise by the member on the camera body from the state of FIG. 9, the roller 14b of the set operation member 14 pushes the pushed portion 13a of the set member 13 to set The member 13 is rotated counterclockwise against the biasing force of a spring (not shown). Accordingly, the set member 13 sequentially pushes the rollers 11b and 12b of the leading blade driving member 11 and the trailing blade driving member 12 by the rollers 13b and 13c, and these driving members 11 and 12 are not shown. It is rotated clockwise against the biasing force of the drive spring.

  Therefore, first, when the leading blade drive member 11 is started to rotate clockwise, the three blades 37, 38, 39 of the leading blade stored in the upper position of the opening 1a are adjacent to each other. It is actuated downward while reducing the amount of overlap. When the overlap between the slit forming blade 39 of the leading blade and the slit forming blade 44 of the trailing blade reaches a predetermined amount, the trailing blade driving member 12 can also start to rotate in the clockwise direction. Therefore, the three blades 42, 43, 44 of the rear blades are operated downward while reducing the overlapping amount of the adjacent blades from that time point. Thereafter, the leading blade and the trailing blade continue to operate while suitably maintaining the overlapping amount of the slit forming blades.

  In this way, the set operation is performed, and the three blades 37, 38, and 39 of the leading blade are in a deployed state to cover the opening 1a, and the three blades 42, 43, and 44 of the trailing blade are When reaching the position below the opening 1a in the overlapping state, the locked portion 11a of the leading blade driving member 11 comes into contact with the locking portion 15a of the leading blade locking member 15, and the leading blade is reached. The locking member 15 is started to rotate slightly clockwise against a biasing force of a spring (not shown). When the contact of the leading blade driving member 11 is released by continuing to rotate, the leading blade locking member 15 is rotated counterclockwise by the biasing force of a spring (not shown), The locked portion 11a can be locked by the locking portion 15a. FIG. 12 shows this state.

  Moreover, immediately before the state shown in FIG. 12, the locked portion 12a of the trailing blade driving member 12 is already in contact with the locking portion 16a of the trailing blade locking member 16, and the state shown in FIG. When this happens, the rear blade locking member 16 is slightly rotated clockwise against the biasing force of a spring (not shown). Therefore, when the trailing blade driving member 12 is still rotated counterclockwise from this state, the contact between the locked portion 12a and the locking portion 16a is released, and the trailing blade locking member 16 is rotated counterclockwise by a biasing force of a spring (not shown), and the locked portion 12a can be locked by the locking portion 16a. FIG. 13 shows this state.

  The rotational force in the clockwise direction of the set operation member 14 by a member on the camera main body (not shown) is lost immediately after the set operation member 14 enters the state shown in FIG. Therefore, the set member 13 can be rotated in a clockwise direction by a biasing force of a spring (not shown), and the pushed portion 13a pushes the roller 14b of the set operation member 14, thereby causing the set operation member 14 to counterclockwise. Rotate in the direction. Then, the trailing blade driving member 12 follows by a biasing force of a trailing blade driving spring (not shown), and the locked portion 12 a is locked by the locking portion 16 a of the trailing blade locking member 16. Then, the roller 13c of the set member 13 moves away from the roller 12b of the rear blade drive member 12, and then the front blade drive member 11 follows by the biasing force of the front blade drive spring (not shown), When the locked portion 11 a is locked by the locking portion 15 a of the leading blade locking member 15, the roller 13 b of the set member 13 also moves away from the roller 11 b of the leading blade drive member 11.

  On the other hand, when the set operation member 14 is rotated counterclockwise, the roller 14c releases the pressing force of the hold auxiliary member 27. Therefore, the hold auxiliary member 27 follows by the urging force of the coupling spring 31 and the urging force of the separation spring 32, and the locked portion 27 d is locked by the locking portion 34 a of the release member 34. However, in the locked state, the contact portion 27a of the hold auxiliary member 27 is not yet in contact with the shaft 26a of the hold member 26. Thereafter, the set member 13 still rotates the set operation member 14 in the counterclockwise direction and stops when the set operation member 14 comes into contact with the bent portion 8a of the shelf board 8. 1 and 2 show a state in which the setting operation is completed in this way, and this state is a standby state for the next photographing.

  In the case of the present embodiment, the present invention is configured as a focal plane shutter having two shutter blades (front blade and rear blade) that can be employed in both a silver salt film camera and a digital camera. It is. However, among the constituent members of the present embodiment, the leading blade composed of the arms 35, 36 and the blades 37, 38, 39, the leading blade driving member 11, the leading blade locking member 15, and the leading blade release. If the member 22 and the electromagnet 17 for the leading blade are removed, a focal plane shutter having one shutter blade that can be used only in a digital camera can be obtained. In this embodiment, one shutter blade has three blades. However, the number of blades may be only one, or a plurality of blades other than three may be used. I do not care.

It is a top view of the Example which showed about the left half when seeing the opening-and-closing drive mechanism of the shutter blade in the set state from the subject side. It is the top view of the Example which showed the latch release mechanism in the set state seeing from the to-be-photographed object side. It is the side view which expanded and showed a part of locking release mechanism shown by FIG. It is a figure for demonstrating the rotation positional relationship of the press member with respect to the holding member in an Example, Comprising: Fig.4 (a) is the top view which showed the reference | standard state of the press member, FIG.4 (b) is FIG. FIG. 4C is a side view seen from the left side of a), FIG. 4C is a plan view showing a state where the pressing member is rotated counterclockwise from the state of FIG. 4A, and FIG. It is the top view which showed the state which the pressing member rotated clockwise from the state of Fig.4 (a). FIG. 3 is a plan view of the embodiment shown in the same manner as FIG. 2, showing a state in which the holding force of the two release members by the hold member is released from the state of FIG. 2. FIG. 6 is a plan view of the embodiment viewed in the same manner as FIG. 2, and shows a state in which the engagement of the leading blade driving member is released from the state of FIG. 5. FIG. 2 is a plan view of the embodiment shown in the same manner as FIG. 1 and shows a state in which the opening operation of the leading blade is completed. FIG. 7 is a plan view of the embodiment shown in the same manner as FIG. 2, and shows a state in which the rear blade drive member is unlocked from the state of FIG. 6. FIG. 2 is a plan view of the embodiment shown in the same manner as FIG. 1, showing a state where the closing operation of the rear blade is completed. FIG. 10 is a plan view of the embodiment shown in the same manner as FIG. 2, and shows a state immediately after the set operation is started after the state of FIG. 9. FIG. 11 is a plan view of the embodiment shown in the same manner as FIG. 2, and shows a state in which the hold member is locked to the holding state of the two release members after the state of FIG. 10. FIG. 9 is a plan view of the embodiment shown in the same manner as FIG. 1, so that the leading blade and the trailing blade are set from the state of FIG. 9 so that the leading blade can be locked by the locking member for the leading blade. It shows the state that became. FIG. 13 is a plan view of the embodiment viewed in the same manner as FIG. 1, and shows a state in which the rear blade can be locked by the rear blade locking member after the state of FIG. 12. .

Explanation of symbols

1 shutter base plate 1a, 2a, 3a opening 1b, 1c long hole 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k, 1m, 6a, 6b, 6h, 6i, 8b, 26a, 26d shaft 2 intermediate plate 3 Auxiliary base plate 4, 5 Buffer member 6 Upper base plate 6c, 6d, 26b, 26c Hole 6e, 6f, 8a, 27b, 27c Bending portion 7 Cover plate 7a Inhibiting portion 7b, 26e Stopper portion 8 Shelf plate 9, 10, 20 , 21 Screw 11 Lead blade drive member 11a, 12a, 27d Locked portion 11b, 12b, 13b, 13c, 14a, 14b, 14c Roller 11c, 12c Drive pin 12 Rear blade drive member 13 Set member 13a, 15b, 16b, 24a, 25a Driven portion 14 Set operation member 15 Lead blade locking member 15a, 16a, 34a Locking portion 16 Rear blade locking member 17, 18 Electromagnet 17a, 18a Iron core member 17b, 18b Coil 17c, 18c Bobbin 22 Lead blade release member 22a, 23a Pushing portion 23 Rear blade release member 24, 25 Iron piece member 26 Hold member 27 Hold auxiliary member 27a, 33c Contact portion 28 Tube shaft member 29 Tubular member 30 Washer 31 Connection spring 32 Separation spring 33 Press member 33a, 33b Press piece 34 Release member 34b Operation portion 35, 36, 40, 41 Arm 37, 38, 39, 42, 43, 44 feathers

Claims (2)

  One or two driving members that are rotated by a biasing force of a driving spring from a set position with a shutter blade at the time of photographing, one or two locking members that lock the driving member at the setting position, and an iron core member One or two electromagnets having a coil and a coil, and in contact with the iron core member in the set state, the current is cut off after being attracted and held by the iron core member by energization of the coil during photographing. In the set state, the holding member has one or two locking release members that are separated from the iron core member by the urging force of the release spring and unlock the driving member by the locking member. A holding member that is pressed by the holding portion to come into contact with the iron core member and is rotated until it comes into contact with the stopper by the biasing force of the separation spring at the time of photographing; A connecting spring that urges the holding member to rotate in a direction opposite to that of the holding member is hung, and at the time of setting, the holding member is rotated against the urging force of the separating spring via the connecting spring. After contacting the iron core member, the holding spring is rotated by the urging force of the separating spring together with the holding member after being rotated to the set position by rotating the connecting spring and rotated by the urging force of the linking spring at the time of photographing. An auxiliary member, and a release member that locks the hold auxiliary member at the set position in the set state and releases the lock after energization of the coil at the time of photographing. The hold member and the hold auxiliary member are provided. One member is integrally attached to a tube shaft member that is rotatable on a fixed shaft, and the other is rotatably mounted on the tube shaft member. The spring is a torsion coil spring, and the coil portion is fitted so as to be in contact with both the tubular member attached to the fixed shaft and the tube shaft member. Plane shutter.   The drive member, the locking member, the electromagnet, and the locking release member are each provided in two, and the hold portion is a pressing member attached to the hold member, and is in a set state 2. The camera focal according to claim 1, wherein the two locking release members are pressed by the pressing member so that the iron piece members are brought into contact with the iron core members. 3. Plane shutter.