JP2008275778A - Focal plane shutter for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a focal plane shutter for a camera constituted to suitably stop rotation of a drive member for allowing a shutter blade to perform opening/shutting operation by braking a member rotating interlocked with the drive member. <P>SOLUTION: A gear 8 rotated by a front blade drive member 6 and a gear 15 rotated by a rear blade drive member 13 respectively have two projection parts 8a and 8b, 15a and 15b. Notched parts 9a and 9b, 16a and 16b are respectively formed on friction plates 9 and 16 rotatably attached coaxially with the gears 8 and 15. Just before finishing exposure operation, the respective drive members 6 and 13 are braked by allowing the projection parts 8a and 8b, 15a and 15b of the gears 8 and 15 to rotate the friction plates 9 and 16 first, and stopped by allowing drive pins 6d and 13d to abut on cushioning members 2 and 3 next. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a focal plane shutter for a camera having one or two shutter blades.

  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. Two shutter blades, each of which is referred to as `` I '', are arranged separately, and one shutter blade is arranged in the blade chamber formed between the shutter base plate and the auxiliary base plate. It has been. The former focal plane shutter can be adopted for both a silver salt film camera and a digital camera, while the latter focal plane shutter can be adopted only for a digital camera.

  In any of the focal plane shutters, the shutter blades have substantially the same configuration, and have a plurality of arms that are rotatably attached to the shutter base plate at one end in the length direction. And at least one blade.

  The shutter blade drive member is rotatably attached to the outer surface of the shutter base plate of the shutter base plate, and the drive pin is extended into the blade chamber from an arc-shaped long hole formed in the shutter base plate. It is fitted in a hole formed in one of the arms. When the driving member reciprocates, the shutter blades open and close the exposure opening. Further, the drive member is usually configured to be rotated by a biasing force of a drive spring to one side and to be rotated by a set member that is rotatably attached to the shutter base plate. However, recently, there is also known a drive source that is rotated in both directions by using an electromagnetic actuator without using such a drive spring.

  In the focal plane shutter having such a configuration, the shutter blades are operated at a high speed at the time of photographing, but at the end of the operation, the driving member and the shutter blades are brought into contact with the stopper and stopped. At that time, if it comes into contact with the stopper and bounces significantly, uneven exposure will occur, or the shutter blade will be destroyed due to the shocking phenomenon, so the buffer member made of elastic material such as butyl rubber at the stop position In general, the drive member and the shutter blade are brought into contact with them. However, in the case of a drive member, since it is directly rotated by a drive source, it may not be sufficient to provide the buffer member as described above. Therefore, in such a case, a brake member to which a frictional force is applied is provided in addition to the buffer member, and the drive pin of the drive member is first braked by rotating the brake member. It is known to make contact with the buffer member. A focal plane shutter configured as described above is described in Patent Document 1 below.

JP-A-9-236845

  By the way, the brake member described in Patent Document 1 is attached to the position near the buffer member attached away from the attachment position of the drive member so that a frictional force acts on the rotation by the leaf spring. However, since both rotations are performed by being pushed by the drive pin, the brake member is formed with two cam surfaces that are pushed against the drive pin. Has been. As is well known, in general, the design and processing of a cam surface is not easy. Therefore, it is never designed by design to form two cam surfaces that are different in shape from each other and that are interlocked only from a predetermined position with respect to the same drive pin as in the brake member described above. It is not preferable. Moreover, the timing and position at which the drive pin abuts against the cam surface also deviates depending on the processing tolerance of the brake member and the assembly tolerance to the ground plane. It is very difficult to apply predetermined braking to the pins.

  The present invention has been made to solve such problems, and the object of the present invention is to control a member that always rotates in conjunction with the drive member at the end of the rotation of the drive member. To provide a focal plane shutter for a camera that is easy to design and manufacture so that a driving member can be suitably stopped without providing a member having a cam surface by providing power. .

  In order to achieve the above object, the focal plane shutter for a camera according to the present invention comprises at least one blade chamber between them, and at least one elongated hole having an arc shape is formed on one of them. It is composed of two ground planes, a plurality of arms and at least one blade pivotally supported by the arms, and at least one end of the arms is rotatably attached to the one ground plane in the blade chamber. At the time of photographing, it has one shutter blade and a drive pin that is rotatably attached to the one base plate outside the blade chamber and is connected to one of the arms through the long hole. It has at least one drive member that is rotated by a drive source to operate the shutter blades, and at least two pushing parts, and can rotate on the one base plate. And a gear meshed with the partial gear portion, and at least two driven portions that are pressed in different rotational directions by the pressing portion, and are coaxial with the gear and rub against the rotation. A friction plate that is attached with force and that is pushed only by the pushing portion to rotate and brakes the rotation of the driving member only at the end of the rotation of the driving member. To be.

  In this case, it is preferable that the friction plate is applied with a frictional force by being pressed in the axial direction by the spring member. In this case, the spring member is a compression coil spring. Preferably there is.

  In the focal plane shutter for a camera according to the present invention, the gear that always rotates in conjunction with the drive member is braked by the friction plate to which a frictional force is applied only at the end of the rotation of the drive member. As in the prior art, there is an advantage that a member having a cam surface is not required and design and manufacture are facilitated.

  Embodiments of the present invention will be described with reference to the illustrated examples. The present invention can be applied to a focal plane shutter having two shutter blades as well as a focal plane shutter having one shutter blade as described above. And applied to a focal plane shutter having two shutter blades called rear blades. Further, as described above, the focal plane shutter having two shutter blades can be used for both a silver salt film camera and a digital camera, but the embodiment will be described when it is applied to a digital camera. To do.

  The present embodiment will be described with reference to FIGS. FIG. 1 is a plan view showing the left half of the state immediately after the exposure operation is viewed from the subject side, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. It is AA sectional view. 4 to 8 are plan views viewed in the same manner as in FIG. 1. FIG. 4 shows the set state, and FIG. 5 shows the state immediately before the start of the exposure operation. It is a thing. FIG. 6 shows the state immediately before the end of the exposure operation of the leading blade, FIG. 7 shows the state of the end of the exposure operation of the leading blade, and FIG. 8 shows the end of the exposure operation of the trailing blade. This shows the previous state.

  First, the configuration of this embodiment will be described mainly with reference to FIGS. The shutter base plate 1 has an opening 1a for a subject optical path in which a rectangle is horizontally long at a substantially central portion thereof, but FIG. 1 shows about a left half when viewed from the subject side. Only part of the part 1a is also shown. Although not shown in the figure because it is well known, in FIG. 1, an intermediate plate and an auxiliary ground plate are sequentially attached to the back side of the shutter base plate 1, that is, the solid-state imaging device side, with a predetermined interval, by appropriate means. The blade chamber of the leading blade is configured between the shutter base plate 1 and the intermediate plate, and the blade chamber of the trailing blade is configured between the intermediate plate and the auxiliary ground plate. And the opening part slightly larger than the opening part 1a is formed also in those intermediate | middle boards and auxiliary | assistant ground boards in the place which overlaps with the opening part 1a. Therefore, in the case of the present embodiment, the opening 1a regulates the exposure opening.

  The shutter base plate 1 is formed with two large arc-shaped long holes 1b and 1c in the region on the left side of the opening 1a, and the planar shape is C-shaped at the lower end thereof. Buffer members 2 and 3 made of butyl rubber are attached in a known manner. The shafts 1d, 1e, 1f, 1g, and 1h are erected on the subject side surface of the shutter base plate 1, and the shafts 1i, 1j, 1k, and 1m are erected on the blade chamber side surface. Among them, the shaft 1d and the shaft 1i, and the shaft 1f and the shaft 1k are erected so as to be concentric with each other. In addition, a plurality of other shafts (not shown) are erected on the surface of the shutter base plate 1 on the subject side, and are shown so as to be parallel to the shutter base plate 1 at their tips. There are no known support plates attached. And the support blade is attached with a front blade electromagnet and a rear blade electromagnet on the shutter base plate 1 side. In FIGS. 1 and 4 to 8, the iron core member 4 of the front blade electromagnet and Only the iron core member 5 of the electromagnet for the rear blade is shown by a two-dot chain line.

  A synthetic resin front blade drive member 6 is rotatably attached to the shaft 1d of the shutter base plate 1 and is rotated clockwise by a well-known front blade drive spring (not shown). It is energized. As shown in the enlarged view of FIG. 2, the leading blade driving member 6 includes a partial gear portion 6a, a driven portion 6b, a mounting portion 6c formed thick on the subject side, and the shutter base plate 1. The drive pin 6d is erected on the side, and the drive pin 6d is inserted into the long hole 1b shown in FIG. Moreover, the cavity part is formed in the attaching part 6c, and the iron piece member 7 is attached there as well known. The iron piece member 7 includes a shaft portion 7a, an iron piece portion 7b fixed to one end thereof, and a flange portion 7c formed at the other end, and is fitted into the shaft portion 7a in the cavity. It is urged | biased by the compression coil spring which is not shown in figure so that the iron piece part 7b may protrude outside a cavity.

  The shaft 1e of the shutter base plate 1 is a two-stage shaft composed of a large-diameter portion on the root side and a small-diameter portion on the tip side, as can be seen from FIG. 3 which is a cross-sectional view taken along line AA in FIG. A gear 8 is rotatably attached to the large diameter portion. The gear 8 has two protrusions 8a and 8b on the subject side surface, and meshes with the partial gear portion 6a of the leading blade drive member 6 described above. And the both ends of the rotation direction of each protrusion part 8a, 8b are the pushing parts of this invention, respectively. Therefore, one projection has two pushing parts. A friction plate 9 is rotatably attached to the small diameter portion of the shaft 1e. And this friction board 9 has two notch parts 9a and 9b formed in circular arc shape in the peripheral surface, and both ends of the arc-like length direction of those notch parts 9a and 9b are used. The driven portions are pressed by the protrusions 8a and 8b. Further, a compression coil spring 10 is fitted to the small diameter portion, and the pressing plate 12 is attached to the tip of the small diameter portion with a screw 11, so that the friction plate 9 is made to have a large diameter portion and a small diameter portion. And is in pressure contact with the step surface. In order to make the drawings easier to see, the compression coil spring 10 is not shown in the drawings other than FIG. 3, and the pressing plate 12 is indicated by a two-dot chain line.

  A synthetic resin rear blade drive member 13 is rotatably attached to the shaft 1f of the shutter base plate 1 so as to be rotated clockwise by a known rear blade drive spring (not shown). It is energized. The rear blade drive member 13 includes a partial gear portion 13a, a roller 13b that is rotatably mounted, a mounting portion 13c that is formed thick on the subject side, and a drive pin 13d that is erected on the shutter base plate 1 side. The drive pin 13d is inserted into the long hole 1c. Moreover, the hollow part is formed in the attaching part 13c, and the iron piece member 14 is attached there. And this iron piece member 14 consists of the shaft part 14a, the iron piece part 14b fixed to the one end, and the collar part 14c formed in the other end like the said iron piece member 7, In FIG. 2, the iron piece portion 14b is urged out of the cavity by a compression coil spring (not shown) fitted to the shaft portion 14a.

  The shaft 1g of the shutter base plate 1 is a two-stage shaft having the same shape as the shaft 1e, and a gear 15 is rotatably attached to the large-diameter portion on the base side. The gear 15 has two projecting portions 15 a and 15 b as pushing portions, similarly to the gear 8, and meshes with the partial gear portion 13 a of the trailing blade drive member 13. A friction plate 16 is rotatably attached to the small diameter portion on the tip side of the shaft 1g. The friction plate 16 also has two cutout portions 16a and 16b formed in a circular arc shape on the peripheral surface, like the friction plate 9 described above. The driven portions are pressed by the portions 15a and 15b. Further, a compression coil spring (not shown) similar to that of the compression coil spring 10 is fitted to the small diameter portion of the shaft 1g, and the presser plate 18 (similar to the presser plate 12 described above) is screwed by the screw 17. The friction plate 16 is brought into pressure contact with the step surface between the large diameter portion and the small diameter portion.

  A synthetic resin set member 19 is rotatably attached to the shaft 1h of the shutter base plate 1 and is urged to rotate counterclockwise by a well-known return spring (not shown). FIG. 1 shows a state where the rotation is blocked by means not shown. Hereinafter, this position is referred to as an initial position. The set member 19 includes a pushing portion 19a that pushes the driven portion 6b of the leading blade driving member 6, a pushing portion 19b that pushes the roller 13b of the trailing blade driving member 13, and a camera body (not shown). And a driven portion 19c that is pressed by a member on the side.

  Finally, the configuration of the two shutter blades will be described. First, a front blade disposed between the shutter base plate 1 and an intermediate plate (not shown) includes two arms 20 and 21 and three blades 22 and 23 that are pivotally supported in order in the length direction thereof. , 24, and the arms 20, 21 are arranged closer to the shutter base plate 1 than the blades 22, 23, 24, and one end thereof is arranged on the shutter base plate 1 as described above for the shaft 1i. , 1j is rotatably attached. The blade 24 pivotally supported at the forefront of the arms 20 and 21 is a slit forming blade, and, as is well known, in the hole (not shown) formed in the arm 20, The drive pin 6d of the member 6 is fitted.

  On the other hand, as described above, the rear blade disposed between the intermediate plate and the auxiliary ground plate (not shown) has two arms 25 and 26 and three pieces pivoted in order in the length direction thereof. The blades 27, 28, and 29 are configured such that the arms 25 and 26 are disposed closer to the auxiliary base plate than the blades 27, 28, and 29, and one end thereof is erected on the shutter base plate 1. The shafts 1k and 1m are attached so as to be rotatable. A blade 29 pivotally supported at the forefront of the arms 25 and 26 is a slit forming blade. As is well known, a hole (not shown) formed in the arm 25 has a drive for the rear blade. The drive pin 13d of the member 13 is fitted.

  Incidentally, the shutter blade of this embodiment has two arms for each of the front blade and the rear blade, but three or more shutter blades are also known. In the case of this embodiment, the leading blade and the trailing blade are pivotally supported by three blades. However, it is also known that one blade or two blades other than three are used. It is also known that the number of front and rear blades is different. The shutter blades of the present invention may have any configuration among them.

  Next, the operation of this embodiment will be described. FIG. 1 shows a state immediately after the leading blade and the trailing blade have finished the exposure operation. Therefore, the three blades 22 to 24 of the leading blade are overlapped and stored in a position below the opening 1a, and the three blades 27 to 29 of the rear blade are deployed to cover the opening 1a. . At this time, the gear 8 meshed with the partial gear portion 6a of the leading blade drive member 6 causes the projections 8a and 8b to extend in the arc-shaped length direction of the notches 9a and 9b of the friction plate 9. Similarly, the gear 15 that is in contact with one end and meshes with the partial gear portion 13a of the drive member 13 for the rear blades has the projections 15a and 15b connected to the circles of the notches 16a and 16b of the friction plate 16. It is made to contact one end of the arc-like length direction. In this state, when the imaging information is transferred from the solid-state imaging device to the storage device, the set operation is started immediately.

  In the state of FIG. 1, in the state of FIG. 1, a member on the camera body side (not shown) pushes the driven portion 19 c of the set member 19, and the set member 19 is resisted against the biasing force of the return spring (not shown). This is done by rotating it clockwise. Thereby, first, the set member 19 has its pushing portion 19a pushing the pushed portion 6b of the leading blade driving member 6 and resists the biasing force of the leading blade driving spring (not shown). The drive member 6 is started to rotate counterclockwise. Therefore, the gear 8 starts to rotate in the clockwise direction, and the protrusions 8a and 8b move away from the arc-shaped lengthwise ends of the notches 9a and 9b of the friction plate 9.

  After that, when the leading blade slit forming blade 24 overlaps the trailing blade slit forming blade 29 by a predetermined amount, the other pushing portion 19b of the set member 19 is attached to the trailing blade driving member 13. By pushing the roller 13b, the trailing blade driving member 13 starts to rotate counterclockwise against the urging force of the trailing blade driving spring (not shown). Therefore, the gear 15 starts to rotate in the clockwise direction, and the protrusions 15a and 15b move away from one end in the arc-shaped length direction of the notches 16a and 16b of the friction plate 16. After that, the three blades 22 to 24 of the leading blade operate upward while reducing the overlap between the blades, and the three blades 27 to 29 of the rear blade are increasing the overlap between the blades. Operates upward.

  In this way, the set operation is performed, and when the upper edge of the slit forming blade 24 of the leading blade and the lower edge of the slit forming blade 29 of the trailing blade are just before reaching the upper side of the opening 1a, one gear 8 projecting portions 8a and 8b are in contact with the other arc-shaped lengthwise ends of the notches 9a and 9b of the friction plate 9, and resist the friction force applied by the compression coil spring 10 The plate 9 starts to rotate clockwise, and the projections 15a and 15b of the other gear 15 also come into contact with the other ends of the cutout portions 16a and 16b of the friction plate 16 in the arcuate length direction, not shown. The friction plate 16 starts to rotate clockwise against the friction force applied by the compression coil spring.

  Thereafter, when the three blades 22 to 24 of the front blade are deployed to cover the opening 1a, and the three blades 27 to 29 of the rear blade are overlapped and stored in the upper position of the opening 1a, The iron piece portions 7b and 14b of the iron piece members 7 and 14 attached to the drive members 6 and 13 come into contact with the iron core members 4 and 5 of the leading blade electromagnet and the trailing blade electromagnet. However, the drive members 6 and 13 are rotated slightly counterclockwise, and are stopped when the pushing of the member on the camera main body (not shown) with respect to the set member 19 is stopped. Set state shown in. Therefore, although not understood from FIG. 4, in this state, the compression coil springs (not shown) accommodated in the mounting portions 6c and 13c of the drive members 6 and 13 are actually compressed. The flange portions 7c and 14c of the iron piece members 7 and 14 are slightly separated from the attachment portions 6c and 13c of the drive members 6 and 13, respectively. The set member 19 is maintained in this state until the next photographing is performed.

  When the release button is pressed at the time of the next shooting, first, the coils of the leading blade electromagnet and the trailing blade electromagnetic magnet are energized, so that the iron core members 4 and 5 are the iron pieces of the iron piece members 7 and 14, respectively. The parts 7b and 14b are sucked and held. Thereafter, the depressing force of the member on the camera body (not shown) against the pushed portion 19c of the set member 19 is released, and the set member 19 is counterclockwise from the position of FIG. Rotated in the direction. In the initial stage of the rotation, the pushing portions 19a and 19b of the set member 19 are separated from the pushed portion 6b of the leading blade driving member 6 and the roller 13b of the trailing blade driving member 13. In the stage, the drive members 6 and 13 are already held by the iron core members 4 and 5 by the iron core members 4 and 5 as described above, so that their mounting portions 6c and 13c are slightly separated. It stops in contact with the flanges 7c and 14c of the iron piece members 7 and 14 that have been left, and the exposure operation is not started.

  Then, the state in which the set member 19 has returned to the initial position is the state shown in FIG. Therefore, at this time, the gears 8 and 15 are slightly rotated counterclockwise because the drive members 6 and 13 are slightly rotated clockwise as compared with the state of FIG. The protrusions 8a, 8b, 15a, 15b are slightly separated from the other ends of the arc-shaped cutouts 9a, 9b, 16a, 16b formed in the friction plates 9, 16.

  When the state shown in FIG. 5 is reached, first, the current supply to the coil of the leading blade electromagnet is cut off. As a result, the suction force of the iron core member 4 with respect to the iron piece member 7 is lost, so that the leading blade driving member 6 is rapidly rotated clockwise by the biasing force of the leading blade driving spring (not shown). 8 is rotated counterclockwise. Therefore, the three blades 22 to 24 of the leading blade are moved substantially downward while increasing the overlap between the blades, and open the opening 1a from above. As is well known, when the subject is relatively bright, the exposure operation of the rear blade is started before the front blade fully opens the opening 1a, and the slit formation blade 24 of the front blade and the slit formation of the rear blade are formed. The imaging surface of the solid-state imaging device is sequentially exposed by the slit formed between the blade 29, but when the subject is dark, the exposure of the rear blade is performed after the exposure operation of the front blade is finished. Operation starts. Therefore, the following description of the operation will be made in the latter case.

  FIG. 6 shows a state immediately before the leading blade starts the exposure operation as described above and fully opens the opening 1a. At this stage, the protrusions 8a and 8b of the gear 8 are shown. Is in contact with one end in the length direction of the arc-shaped notches 9a and 9b formed in the friction plate 9. Therefore, when the leading blade driving member 6 still rotates in the clockwise direction, the friction plate 9 is rotated in the counterclockwise direction by the protrusions 8a and 8b, so that the friction applied by the compression coil spring 10 is increased. The rotation of the leading blade driving member 6 is braked by the force. And while being braked in that way, the driving pin 6d abuts against the buffer member 2, whereby the leading blade driving member 6 is restrained from bouncing and suitably stopped. FIG. 7 shows such a stopped state of the leading blade drive member 6. At this time, the three blades 22 to 24 of the leading blade have the opening 1 a fully opened and the opening 1 a. Since it is stored in the lower position, flash photography can be performed as necessary.

  Next, when the energization to the coil of the rear blade electromagnet is cut off, the attraction force of the iron core member 5 to the iron piece member 14 is lost. Therefore, the rear blade drive member 13 is not shown. It is rapidly rotated clockwise by the urging force. Therefore, the three blades 27 to 29 of the rear blade are moved substantially downward while reducing the overlap between the blades, and close the opening 1a from above. Then, as shown in FIG. 8, the projecting portions 15 a and 15 b of the gear 15 are formed in the arc-shaped notches formed in the friction plate 16 immediately after the opening 1 a is closed. Since one end in the length direction of the parts 16a and 16b is pushed and the friction plate 16 is rotated counterclockwise, the clockwise rotation of the rear blade drive member 13 is given by a compression coil spring (not shown). It is braked by the applied frictional force. After that, the trailing blade driving member 13 is restrained from being bound and suitably stopped by the driving pin 13 d coming into contact with the buffer member 3. FIG. 1 shows the stop state. In this state, the imaging information is transferred from the solid-state imaging device to the storage device, and the next set operation is started as described above.

  In the present embodiment, two protrusions 8a and 8b are formed on the gear 8 and two notches 9a and 9b are formed on the friction plate 9, but only one by one is formed. It doesn't matter. In the present embodiment, the arc-shaped notches 9a and 9b are formed in the friction plate 9, but they may be arc-shaped long holes. Furthermore, in the case of the present embodiment, the protrusions 8a and 8b are formed on the gear 8, and the notches 9a and 9b are formed on the friction plate 9, but the protrusions are formed on the friction plate 9, You may make it form the circular-arc-shaped long hole in which the protrusion part is inserted in the gearwheel 8. FIG. In such a case, both ends of the long hole formed in the gear 8 are the pushing portions of the present invention, and both ends in the rotation direction of the protrusions formed on the friction plate 9 are the pushed portions of the present invention. become. Therefore, in any case, the gear 8 has at least two pressing portions, and the friction plate 9 only needs to have at least two driven portions. The same can be said for the relationship between the gear 15 and the friction plate 16.

  Furthermore, in the present embodiment, the compression coil spring 10 applies a frictional force to the rotation of the friction plate 9, but a plate spring may be used instead of the compression coil spring 10. Further, instead of using such a spring member, a coating film is formed on both surfaces of the friction plate 9 itself with a material capable of obtaining a large frictional force such as rubber or synthetic resin, and the coating surface is formed on the pressing plate 12. And may be pressed against the stepped surface of the shaft 1e. The same can be said for the friction plate 16.

  As described above, the description of the present embodiment has been made on the assumption that the focal plane shutter of the present embodiment is employed in a digital camera. However, it goes without saying that the present embodiment can also be employed in a camera using a silver salt film. In the above description, the focal plane shutter according to the present embodiment has been described in the case where the shutter base plate is attached to the camera with the shutter base plate on the subject side. In some cases, it is arranged on the subject side. In the configuration of the above-described embodiment, for example, when the leading blade driving member, the leading blade, and the leading blade electromagnet are removed, a focal plane shutter for a digital camera having a single shutter blade is obtained. . Accordingly, the present invention is also included in the present invention.

It is a top view of the Example which showed the state on the left side seeing the state immediately after completion | finish of exposure operation | movement from the to-be-photographed object side. FIG. 2 is a partially enlarged view of FIG. 1. It is the sectional view on the AA line of FIG. It is the top view which looked and showed the set state similarly to FIG. It is the top view which looked at the state just before the start of exposure operation | movement similarly to FIG. It is the top view which looked at the state just before completion | finish of the exposure operation | movement of a front blade similarly to FIG. It is the top view which looked at the exposure operation completion state of the front blade similarly to FIG. It is the top view which looked at the state just before completion | finish of the exposure operation | movement of a rear blade similarly to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shutter base plate 1a Opening part 1b, 1c Long hole 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k, 1m Axis 2,3 Buffer member 4,5 Iron core member 6 Lead blade drive member 6a, 13a part Gear part 6b, 19c Driven part 6c, 13c Mounting part 6d, 13d Drive pin 7, 14 Iron piece member 7a, 14a Shaft part 7b, 14b Iron piece part 7c, 14c Ridge part 8, 15 Gears 8a, 8b, 15a, 15b Protrusion 9, 16 Friction plate 9a, 9b, 16a, 16b Notch 10 Compression coil spring 11, 17 Screw 12, 18 Holding plate 13 Rear blade drive member 13b Roller 19 Set member 19a, 19b Pushing portion 20, 21 , 25, 26 Arms 22, 23, 24, 27, 28, 29 Blades

Claims (3)

  At least one vane chamber between them, two ground planes forming at least one arc-shaped elongated hole on one side, a plurality of arms, and at least one pivotally supported by these arms And at least one shutter blade that is rotatably attached to the one base plate in the blade chamber, and is rotatably attached to the one base plate outside the blade chamber. At least one drive member that has a partial gear portion and a drive pin that passes through the elongated hole and is connected to one of the arms, and that is rotated by a drive source at the time of shooting to actuate the shutter blade; A gear having at least two pushing portions and rotatably attached to the one base plate and meshing with the partial gear portion; and the pushing portion. At least two driven parts that are pushed in different directions of rotation, and are attached coaxially with the gears with a frictional force applied to the rotation of the gears. A focal plane shutter for a camera, comprising: a friction plate that presses against the pushing portion to rotate and brakes rotation of the driving member.   The focal plane shutter for a camera according to claim 1, wherein the friction plate is given a frictional force by being pressed in the axial direction by a spring member.   The focal plane shutter for a camera according to claim 2, wherein the spring member is a compression coil spring.

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