JP5117096B2 - Focal plane shutter for camera - Google Patents

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.

  Also, in any focal plane shutter, the configuration of the shutter blades is substantially the same, a plurality of arms having one end in the length direction rotatably attached to the shutter base plate, and pivotally supported by these arms. It is composed of at least one blade. The 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. Connected to one. For this reason, the shutter blade performs the opening / closing operation of the exposure opening by the reciprocating rotation of the driving member.

  As described in Patent Document 1 below, the drive member is rotated to one side by the urging force of the drive spring, and to the other, the set member is rotatably attached to the shutter base plate. It is usual that it is comprised so that it may be rotated by. However, recently, there has been known a configuration that is configured to be rotated in both directions by an electromagnetic actuator without using such a drive spring.

  Further, in the focal plane shutter having such a configuration, the driving member and the shutter blade perform the exposure operation at a high speed. Therefore, at the time of stopping, they abut against an elastic buffer member made of butyl rubber or the like, and are braked by being compressed, thereby suppressing the bounce and absorbing the shock. In the focal plane shutter described in Patent Document 1, such a buffer member is provided with a position where the drive pin of the drive member can contact, a position where one of the arms of the shutter blade can contact, and a blade of the shutter blade. Is prepared for a position where the contact can be made.

  Among such buffer members, the buffer member with which the drive pin abuts is attached to the end of the long hole of the shutter base plate through which the drive pin passes, by fitting or adhesive. Moreover, the buffer member with which the arm abuts and the blade member with which the blade abuts may be attached to the shutter base plate with an adhesive or may be attached to the auxiliary base plate with an adhesive. Then, at the end stage of the exposure operation, the order of contact with each buffer member is, as described in Patent Document 1, first the drive pin of the drive member is contacted, then the arm is contacted, Finally, it is common for the blades to be in contact. The present invention relates to a focal plane shutter configured such that an arm can make a suitable contact with a buffer member.

JP 2001-211942 A

  As described above, the buffer member is made of an elastic material such as butyl rubber, and is compressed to exert a braking action on the drive member and the shutter blade, thereby suppressing the bounce and absorbing the shock. I am doing. However, since the material is soft, there is a problem that if the material is abutted many times by a thin member, the surface will eventually be cut and the buffer performance will be lowered. As described above, at the end of the exposure operation, first, the drive pin of the drive member contacts the buffer member. Therefore, the buffer member receives the largest force among the buffer members. However, since the drive pin does not have a thin plate-shaped portion, the surface of the buffer member is not damaged.

  On the other hand, the arm and the blades which are constituent members of the shutter blades are thin plate-like members, whether they are made of metal or made of synthetic resin, and the thin end surfaces thereof are buffer members. It is made to contact with. However, as described above, since the blade comes into contact with the buffer member after the arm contacts the buffer member, the force exerted by the blade on the buffer member at the time of contact is smaller than that in the case of the arm. Therefore, in the case of a blade | wing, there is little possibility of damaging a buffer member compared with the case of an arm. Therefore, what has to be most problematic is how the arm can withstand long-term use without damaging the buffer member due to contact.

  The present invention has been made to solve such problems, and the object of the present invention is to make the arm, which is a constituent member of the shutter blade, abut the buffer member at the end of the exposure operation. Even if configured, it is to provide a focal plane shutter for a camera excellent in durability that does not damage the surface of the buffer member.

In order to achieve the above object, a focal plane shutter for a camera according to the present invention comprises two ground planes constituting at least one blade chamber between them, a plurality of thin arms, and one surface of those arms. At least one blade that is pivotally supported on the side, and one end of each of the arms is individually rotatably attached to one of the two ground planes, At least one drive pin connected to one of the arms and rotatably attached to one of the two ground planes outside the blade chamber to cause the shutter blade to open and close by reciprocating rotation. a drive member, taken up in one of the two ground plane to be positioned outside of the path of action of the arm in the blade chamber is fabricated of an elastic material such as rubber In operation completion steps of said shutter blade upon vignetting and it is captured and one of the arm and the buffer member to contact, and wherein the buffer member is disposed in the most the buffer member side of said arm arm abuts who is, the arm abuts the cushioning member is made of synthetic resin, as the near portion to the cushioning member and the portion in contact with the thick portion that is thicker on the side opposite to the front Stories blade side To be formed.

Further, the focal plane shutter for the above camera, the arm abuts the cushioning member, which is made of metal, wherein its portion close to the buffer member and the site in contact is a front Symbol blade side is bent on the opposite side Alternatively, it may be formed as a superposed portion.

  In the focal plane shutter for a camera according to the present invention, the arm abutting against the buffer member is formed by a molding technique in the case of a synthetic resin, and is bent by a bending process in the case of a metal. Even if the arm is in contact with the buffer member with a large force, the adjacent part is thicker on the side opposite to the blade side than the other part, and the area of the end surface in contact with the buffer member is increased. There is an advantage that durability can be improved without damaging the surface of the buffer member.

  The embodiment of the present invention will be described with reference to two illustrated examples. As described above, the present invention can be applied to a focal plane shutter having two shutter blades and a focal plane shutter having one shutter blade. The present invention is applied to a focal plane shutter having two shutter blades called a front blade and a rear blade. Further, as described above, the focal plane shutter having two shutter blades can be used for a silver salt film camera and a digital camera. However, the focal plane shutter of the embodiment is used for a digital camera. I will explain on the assumption that 1 to 6 are for explaining the first embodiment, and FIGS. 7 and 8 are for explaining the second embodiment.

  First, Example 1 will be described with reference to FIGS. 1 is a plan view of the set state as viewed from the subject side, FIG. 2 is a plan view of the set state as viewed from the solid-state image sensor side with the auxiliary ground plate removed, and FIG. 3 is an exposure operation. 4 is a plan view of the state immediately after ending from the subject side, and FIG. 4 is a plan view of the state immediately after ending the exposure operation viewed from the solid-state imaging device side in the same manner as in FIG. 5 is a partially enlarged view of FIG. 4, and FIG. 6 is a cross-sectional view taken along line AA of FIG.

  First, the configuration of this embodiment will be described. The shutter base plate 1 is made of synthetic resin, and has an opening 1a for a subject optical path in which a rectangle is horizontally long at a substantially central portion thereof. On the solid-state imaging device side of the shutter base plate 1, a metal intermediate plate 2 and a synthetic resin auxiliary base plate 3 are attached in order by appropriate means at a predetermined interval. Between the intermediate plate 2 and the auxiliary base plate 3, and a rear blade chamber.

  In FIG. 1, the shutter base plate 1 is shown by partially cutting off the lower right portion so that a part of the intermediate plate 2 and the auxiliary base plate 3 can be seen. The overall shape of the intermediate plate 2 is shown in FIG. Further, the auxiliary base plate 3 is only partially shown in FIG. 1 and does not show the overall shape, but has the same outline as the shutter base plate 1. In FIG. 1, two hook portions 3 a and 3 b provided on the auxiliary base plate 3 and hung on the subject side edge of the shutter base plate 1 are shown.

  As shown in FIG. 2, an opening 2a having a shape slightly larger than the opening 1a is formed at a substantially central portion of the intermediate plate 2 so as to overlap the opening 1a. Although not shown, an opening having a shape slightly larger than the opening 1a is formed at a substantially central portion of the auxiliary ground plate 3 so as to overlap the opening 1a. Therefore, the exposure opening as the shutter unit in this embodiment is regulated by the opening 1 a of the shutter base plate 1.

  As shown in FIG. 1, the shutter base plate 1 has two large arc-shaped long holes 1b, 1c in the left region of the opening 1a, and butyl rubber at the lower end thereof. The buffer members 4 and 5 made of a material are fitted in a known manner. As can be seen from FIG. 2, the shape on the right side of the intermediate plate 2 is formed so as to avoid the overlap with the long holes 1b and 1c. Moreover, although not shown in figure, the auxiliary | assistant ground plane 3 is formed with the long groove | channel of the substantially same planar shape in the place which overlaps with these long holes 1b and 1c.

  Further, shafts 1d, 1e, and 1f are erected on the subject side surface of the shutter base plate 1, and a front blade drive member 6, a rear blade drive member 7, and a set member 8 are rotatably attached to them. It has been. Among them, the leading blade driving member 6 and the trailing blade driving member 7 have driven portions 6a and 7a, mounting portions 6b and 7b, and driving pins 6c and 7c. A well-known leading blade driving spring and trailing blade driving spring not shown are urged to rotate clockwise in the set state of FIG. Further, as shown in Patent Document 1, the iron pieces 9 and 10 are attached to the attachment portions 6b and 7b together with a compression spring (not shown), and the compression springs are compressed. By doing so, the relative attachment state with respect to each drive member 6, 7 can be changed. Further, the drive pins 6c and 7c have a circular cross-sectional shape on the base side and a cross-sectional shape on the tip side, and are inserted into the blade chamber from the long holes 1b and 1c.

  Further, the set member 8 has pushing portions 8a, 8b and a pushed portion 8c, and is biased to rotate counterclockwise by a well-known return spring (not shown). In FIG. 1, a member on the camera side (not shown) is in contact with the pushed portion 8c to suppress the rotation. Therefore, when the inhibition is released, the set member 8 is rotated counterclockwise, but the rotation is stopped by a stopper (not shown) provided on the shutter base plate 1. It has become. FIG. 3 shows a state in which the rotation of the set member 8 in the counterclockwise direction is stopped. Hereinafter, such a stop position is referred to as an initial position of the set member 8.

  In addition to the above-mentioned shafts 1d, 1e, and 1f, a plurality of shafts (not shown) are erected on the surface of the shutter base plate 1 on the left side of the opening 1a. A well-known support plate (not shown) and a printed wiring board are overlapped and attached so as to be parallel to the shutter base plate 1. A well-known front wing electromagnet and rear wing electromagnet are attached to the support plate attached to the shutter base plate 1 side of the printed wiring board. In FIGS. 1 and 3, these electromagnets are used. Only the arrangement state of the iron core members 11 and 12 which are the constituent members is indicated by a two-dot chain line.

  As shown in FIG. 2, shafts 1g, 1h are concentric with the blade chamber side surface of the shutter base plate 1 so as to be concentric with the shafts 1d, 1e standing on the subject side surface. In addition to being erected, shafts 1i, 1j, and 1k are erected. Among these shafts, a ring-shaped buffer member 13 made of butyl rubber is attached with an adhesive around the shaft 1k. Further, two buffer members 14 and 15 made of butyl rubber are attached to the inside of the outer wall portion 1m formed below the shutter base plate 1 with an adhesive.

  As described above, the leading blade is disposed in the blade chamber between the shutter base plate 1 and the intermediate plate 2, and the trailing blade is disposed in the blade chamber between the intermediate plate 2 and the auxiliary ground plate 3. As shown in FIG. 2, the leading blade is composed of two arms 16 and 17 and three blades 18, 19, and 20 that are pivotally supported in order in the length direction thereof. 16 and 17 are arrange | positioned rather than the blade | wings 18, 19, and 20 at the shutter base-plate 1 side, and those one ends are rotatably attached to said axis | shaft 1g, 1i. Then, the drive pin 6c of the above-described leading blade drive member 6 is fitted into an oval hole formed in the arm 16, and the tip thereof is formed in the auxiliary base plate 3 as shown above. Inserted into a long arc-shaped groove.

  In addition, the pivotal support structure of the blades 18, 19, and 20 in a total of six locations is exactly the same, and as is well known, the connecting shaft that is a rivet member is connected to the hole formed in the arm and the hole formed in the blade. They are inserted in order, and their tips are fixed to the blades by caulking. Therefore, the heads of these connecting shafts protrude from the arms 16 and 17 to the shutter base plate 1 side, and the three blades 18, 19 and 20 are located on the intermediate plate 2 side of the arms 16 and 17. It is configured to overlap. In the case of the present embodiment, the arms 16 and 17 are made of synthetic resin, and the blades 18, 19, and 20 are made of metal.

  By the way, in this embodiment, the arm 17 and the three blades 18, 19, 20 have a known shape, but the arm 16 directly connected to the drive pin 6 c of the drive member 6 has a unique shape. I am doing. That is, as will be understood from the description below, the arm 16 abuts against the buffer members 13 and 14 in the final stage of the exposure operation, but its vicinity including the abutting portion (indicated by the broken line hatching in FIG. 5). As shown in the cross-sectional view of FIG. 6, the portion shown in FIG. 6 has increased thickness on the surface on the shutter base plate 1 side, in other words, on the surface opposite to the surface pivotally supporting the blades 18 to 20. It is formed as the thick part 16a. And the thickness in the contact part is about twice the thickness other than the thick part 16a.

  On the other hand, the rear blade is composed of two arms 21 and 22 and three blades 23, 24, and 25 that are pivotally supported in order in the length direction thereof. They are placed upside down. Therefore, the arms 21 and 22 are disposed closer to the auxiliary base plate 3 than the blades 23, 24, and 25, and one end thereof is rotatably attached to the shafts 1h and 1j. Further, since the pivotal support structure of the blades 23, 24, 25 is exactly the same as that of the leading blade, the head of each connecting shaft protrudes from the arms 21, 22 to the auxiliary base plate 3 side.

  Further, the rear blade components are made of synthetic resin and the blades 23, 24, 25 are made of metal so that the rear blade components can be shared with the front blade components. Is formed with a thick portion having the same shape as the thick portion 16a of the arm 16 of the leading blade, but the arm 21 does not come into contact with the buffer member as will be described later. Then, the drive pin 7c of the above-described rear blade drive member 7 is fitted into an oval hole formed in the arm 21, and the tip thereof is formed in the auxiliary base plate 3 as shown above. Inserted into a long arc-shaped groove.

  Next, the operation of this embodiment will be described. 1 and 2 show a set state, that is, a photographing standby state. As can be seen from FIG. 1, at this time, the set member 8 is prevented from returning to the initial position by a member on the camera main body (not shown) that is in contact with the driven portion 8c, Has been maintained. The leading blade driving member 6 is maintained at this position against the biasing force of the leading blade driving spring (not shown) by the set member 8, and the iron piece member 9 is replaced with the iron core member 11 of the leading blade electromagnet. Is in contact with Therefore, the leading blade covers the opening 1a while minimizing the overlapping amount of the three blades 18-20.

  Incidentally, as can be seen from FIG. 2, in this set state, the thick portion 16 a of the arm 16 shown in FIGS. 5 and 6 overlaps the blades 18 and 19. For this reason, if the thick portion 16a is formed on the surface on the blades 18 to 20 side so as to increase in thickness, the thick portion comes into contact with at least the blade 18 during operation. However, since the thick portion 16a of the present embodiment is formed to increase the thickness on the shutter base plate 1 side, such a situation does not occur. Further, in the case of the present embodiment, the increased thickness of the thick portion 16a is determined by the connecting shaft protruding from the arm 16 (one of which is clearly shown in FIG. 6 without a symbol). Since it is smaller than the protruding amount (height) of the head, the thick portion 16 a does not come into contact with the shutter base plate 1. Therefore, the leading blade can be operated in the same manner as in the prior art.

  On the other hand, the rear blade drive member 7 is also maintained at this position by the set member 8 against the urging force of the rear blade drive spring (not shown), and the iron piece member 10 is replaced with the iron core of the rear blade electromagnet. The member 12 is contacted. Therefore, the rear blade is stored at a position above the opening 1a with the mutual overlapping amount of the three blades 23 to 25 being maximized. By the way, as described above, the arm 21 is also formed with the same thick portion as the thick portion 16a, like the arm 16 of the leading blade. However, the thick portion is formed so as to increase in thickness on the auxiliary ground plate 3 side, and the head of the connecting shaft that pivotally supports the blades 23 to 25 protrudes on the auxiliary ground plate 3 side. Therefore, in the case of this rear blade, the same operation as in the conventional case is possible, as in the case of the above-described front blade.

  When the release button is pressed at the time of shooting, first, the coils of the leading blade electromagnet and the trailing blade electromagnet are energized, and the iron core members 11 and 12 hold the iron piece members 9 and 10 by suction. Thereafter, the restraining force by a member on the camera main body (not shown) against the pushed portion 8c of the set member 8 is released, so that the set member 8 is countered from the position of FIG. It can be rotated clockwise. At the initial stage of the rotation, the pushing parts 8a and 8b of the set member 8 are separated from the pushed parts 6a and 7a of the driving members 6 and 7, but at that stage, each driving member 6 7, since the iron piece members 9, 10 are already attracted and held by the iron core members 11, 12, as described in Patent Document 1, a compression spring (not shown) was compressed at the time of setting. It is only slightly rotated by the amount and does not start the exposure operation. After that, when the set member 8 returns to the initial position and stops, the energization of the coils of the two electromagnets is sequentially cut off at time intervals determined by the exposure control circuit.

  First, when the energization of the coil of the leading blade electromagnet is cut off, the attractive force of the iron core member 11 with respect to the iron piece member 9 is lost. Therefore, the leading blade driving member 6 is a leading blade driving spring (not shown). 1 is rapidly rotated clockwise in FIG. Therefore, the leading blade is exposed by the drive pin 6c, and the three blades 18 to 20 move substantially downward while increasing the overlap between the blades, and open the opening 1a from above. Next, when the energization of the coil of the rear blade electromagnet is cut off, the attractive force of the iron core member 12 with respect to the iron piece member 10 is lost. Therefore, the rear blade drive member 7 is not shown. 1 is rapidly rotated clockwise in FIG. Therefore, the rear blade is exposed by the drive pin 7c, and the three blades 23 to 25 move substantially downward while reducing the overlap between the blades, and close the opening 1a from above. Therefore, thereafter, the imaging surface of the solid-state imaging device is sequentially exposed by the slit formed between the leading blade 20 and the trailing blade 25.

  Thereafter, when the blade 20 of the leading blade is completely retracted from the opening 1 a, the driving pin 6 c of the leading blade driving member 6 first comes into contact with the buffer member 4, and then the leading blade arm 16 contacts the buffer members 13 and 14. The blades 18 to 20 of the leading blades finally come into contact with the buffer member 15 due to inertia, and the operations of the leading blade driving member 6 and the leading blades are stopped. At this time, the arm 16 has substantially the same thickness as each of the blades 18 to 20, but the thick portion 16 a has a portion that abuts against the shock-absorbing members 13 and 14 and is approximately twice as thick. The contact surface is larger than the conventional one, and the surfaces of the buffer members 13 and 14 are not damaged. Therefore, the buffer performance of the buffer members 13 and 14 is suitably maintained over a longer period than before. In this embodiment, two buffer members with which the arm 16 abuts are provided. However, as described in Patent Document 1, only one buffer member may be provided. In that case, the buffer member 13 is usually employed.

  The exposure operation of the leading blade is completed in this way. However, the trailing blade driving pin 7c of the trailing blade driving member 7 immediately after the trailing blade 25 has covered the opening 1a, the buffer member 5 ends. Abut. When the drive pin 7c contacts the buffer member 5, the rear blade drive member 7 is braked by temporarily compressing the buffer member 5 and is prevented from bouncing and stopped. 3 and 4, the exposure operation is completed in this way, the leading blades 18 to 20 are superimposed and stored in a position below the opening 1a, and the trailing blades 23 to 25 are developed and opened. The state which covered the part 1a is shown. In this state, the imaging information is transferred from the solid-state imaging device to the storage device.

  By the way, in the case of the present Example, although the buffer member 5 with which the drive pin 7c of the rear blade drive member 7 contacts is provided, the arms 21 and 22 and the blades 23 to 25 constituting the rear blade are provided. The buffer member which contacts is not provided. The reason for this is that, in the case of the leading blade, if the cushioning member 15 as in the present embodiment is not provided at the minimum, there is a tolerance in each fitting portion of the constituent members, and the tips of the blades 18 to 20 However, due to inertia, it temporarily protrudes downward from the shutter base plate 1. In the case of the rear blade, the region where the blade 25 can operate after the opening 1a is closed is sufficiently below the opening 1a. It is because it exists.

However, even in the case of the rear blade, it is preferable to stop at an early stage after closing the opening 1a. Therefore, as an example of how to do so, in the exposure operation end position of the rear blade at the blade interior of the rear curtain, the auxiliary base plate 3, the shaft portion and the wall portion such as a shaft 1k and the outer wall portion 1m of the There is a method in which the buffer member is attached to the arm member 22 and the blades 25 are brought into contact with the buffer member. Therefore, when doing so, the thick part corresponding to the thick part 16a of the present embodiment is formed in the arm 22 in a shape in which the thickness is increased on the auxiliary base plate 3 side. And even if such a thick part is formed on the arm 17 of the leading blade in order to make the parts common, it goes without saying that there is no problem in operation.

  In this way, in the state of FIGS. 3 and 4, when the imaging information is transferred to the storage device, the set operation is performed immediately. In that case, in the state shown in FIG. 3, a member on the camera body (not shown) pushes the driven portion 8c of the set member 8, and the set member 8 is resisted against the biasing force of the return spring (not shown). Rotate clockwise. As a result, the set member 8 first has a pushing portion 8a that pushes the pushed portion 6a of the leading blade driving member 6 and attaches the leading blade driving spring (not shown) to the leading blade driving member 6. Starts rotating counterclockwise against the forces. Thereafter, when the blade 20 for slit formation of the leading blade overlaps with the blade 25 for slit formation of the rear blade by a predetermined amount, the pushing portion 8b of the set member 8 is pushed by the driven portion 7a of the trailing blade drive member 7. , And starts rotating the rear blade drive member 7 counterclockwise against the biasing force of the rear blade drive spring (not shown). Therefore, after that, the blades 18 to 20 of the leading blade operate upward while reducing the overlap between the blades, and the blades 23 to 25 of the trailing blade operate upward while increasing the overlap between the blades. Go.

  In this way, the set operation is performed, the leading blades 18 to 20 are deployed to cover the opening 1a, and the trailing blades 23 to 25 are overlapped and stored at a position above the opening 1a. In this state, the iron piece members 9 and 10 attached to the drive members 6 and 7 come into contact with the iron core members 11 and 12 of the leading blade electromagnet and the trailing blade electromagnet. In this state, as described in Patent Document 1, the iron piece members 9 and 10 are stopped, but the drive members 6 and 7 are slightly compressed while compressing a compression spring (not shown). When the rotation and the pushing by the member on the camera main body (not shown) are stopped, the set state shown in FIGS. 1 and 2 is entered, and this state is waited until the next photographing.

  In this embodiment, the front blade is disposed between the shutter base plate 1 and the intermediate plate 2, and the rear blade is disposed between the intermediate plate 2 and the auxiliary base plate 3. However, as is well known, the rear blade is disposed. May be disposed between the shutter base plate 1 and the intermediate plate 2, and the leading blade may be disposed between the intermediate plate 2 and the auxiliary base plate 3. In the above description, the focal plane shutter according to the present embodiment is used in a digital camera. However, it goes without saying that the present invention can also be used in a camera using a silver salt film. In addition, when employed in a digital camera, there are cases where the shutter base plate 1 is not on the subject side and the auxiliary base plate 3 is on the subject side as in this embodiment. Further, the drive members 6 and 7 of this embodiment are rotated by the biasing force of the drive spring during the exposure operation, but the present invention can also be applied to those rotated by an electromagnetic actuator. The same can be said for the case of Example 2 below.

  Further, in this embodiment, if the front blade drive member 6, the front blade, and the front blade electromagnet are not provided, a focal plane shutter for a digital camera having one shutter blade is obtained. In this case, as described above, a thick portion corresponding to the thick portion 16 a of the arm 16 may be formed on the arm 22. Therefore, what was comprised in that way is also contained in this invention.

  Next, Example 2 will be described with reference to FIGS. The configuration of this embodiment is almost the same as the configuration of the first embodiment described above. The difference is that the arms corresponding to the leading blade arms 16 and 17 and the trailing blade arms 21 and 22 described in the first embodiment are different. These are all made of metal, and the shape of the arm corresponding to the leading blade arm 16 and the trailing blade arm 21 is different from that of the first embodiment. Also, in the case of the present embodiment, as in the case of the first embodiment, although the arrangement state is different between the leading blade and the trailing blade, substantially the same configuration is used in order to achieve common parts. is doing. Therefore, the configuration of this embodiment only needs to understand the shape of the arm corresponding to the leading blade arm 16 in the first embodiment. Therefore, in FIGS. 7 and 8, the same reference numerals are given to substantially the same members and parts as in the first embodiment, including the arm corresponding to the arm 16. Is attached. 7 is a plan view shown in the same manner as FIG. 5, and FIG. 8 is a cross-sectional view taken along line BB of FIG.

  As described above, since FIG. 7 is shown in the same manner as FIG. 5 used in the description of the first embodiment, it shows a state immediately after the end of the exposure operation as shown in FIG. is there. Therefore, in this state, the leading blade arm 16 is in contact with the buffer members 13 and 14 and is stationary. As described above, in this embodiment, the arm 16 is made of metal. Therefore, it is difficult to form the thick portion 16a like the arm 16 of the first embodiment. Therefore, two overlapping portions 16b and 16c are formed on the arm 16 of this embodiment by bending. And as those superposition | polymerization parts 16b and 16c can also be understood from the cross-sectional shape of the superposition | polymerization part 16c shown by FIG. 8, a part of arm 16 is the surface of the side which is not supporting the blades 18-20. Is polymerized.

  As described above, the overlapping portions 16b and 16c are approximately double the thickness at the abutting portion in the same manner as the thick portion 16a in the first embodiment, so that the surfaces of the buffer members 13 and 14 may be damaged. In addition, since the overlapping portions 16b and 16c are formed, there is no obstacle in operation. Also in the present embodiment, the arm 16 is in contact with the two buffer members 13 and 14, but only one overlapping portion and one buffer member may be provided.

  The focal plane shutter according to the present embodiment is based on the focal plane shutter according to the first embodiment. As described above, the difference is that the arms 16, 17, 21, and 22 are made of metal. Since only the shapes of the arms 16 and 21 are different, the operation of the focal plane shutter of the present embodiment is substantially the same as that of the first embodiment. Therefore, the description of the operation is omitted. Also in the case of the present embodiment, as in the case of the first embodiment, if the front blade drive member 6, the front blade, and the front blade electromagnet are not provided, a digital camera having one shutter blade is provided. Therefore, in the case of such a configuration, an overlap portion corresponding to the overlap portions 16b and 16c of the present embodiment may be formed on the arm 22. Therefore, such a configuration is also included in the present invention.

FIG. 3 is a plan view of Example 1 when the set state is viewed from the subject side. It is the top view of Example 1 which looked at the set state from the solid-state image sensor side by removing the auxiliary ground plane. It is the top view of Example 1 which looked at the state immediately after complete | finishing exposure operation from the to-be-photographed object side. FIG. 3 is a plan view of Example 1 as viewed from the solid-state imaging device side in the same manner as in FIG. FIG. 5 is a partially enlarged plan view of FIG. 4. It is the sectional view on the AA line of FIG. It is a top view of Example 2 shown similarly to FIG. It is the BB sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shutter base plate 1a, 2a Opening part 1b, 1c Long hole 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k Axis 1m Outer wall part 2 Intermediate board 3 Auxiliary base plate 3a, 3b Hook part 4, 5, 13, 14 , 15 Buffer member 6 Lead blade drive member 6a, 7a, 8c Driven portion 6b, 7b Mounting portion 6c, 7c Drive pin 7 Rear blade drive member 8 Set member 8a, 8b Push portion 9, 10 Iron piece member 11 , 12 Iron core member 16, 17, 21, 22 Arm 16a Thick part 16b, 16c Overlapping part 18, 19, 20, 23, 24, 25 Blade

Claims (2)

It is composed of two ground plates constituting at least one blade chamber between them, a plurality of thin arms and at least one blade pivoted on one surface side of those arms. One end of the arm has at least one shutter blade that is individually rotatably attached to one of the two ground planes, and a drive pin connected to one of the arms in the blade chamber, and the outside of the blade chamber At least one drive member that is rotatably attached to one of the two ground planes and that opens and closes the shutter blade by reciprocating rotation, and is made of an elastic material such as rubber, and the arm in the blade chamber wherein a in the operation completion steps of said shutter blade one at attached to and taken of the two ground plane to be positioned outside of the path of action of And one arm abutting buffering member, and wherein the cushioning member is in contact with most the are arranged on the buffer member side arm of said arm, said arm abuts against the buffer member, made of a synthetic resin, a camera focal plane shutter, characterized in that it is formed as a thick portion which is thicker on the side opposite to the the cushioning member and the portion abutting the neighboring portion is a front Symbol blade side. Characterized in that the said arm abutting the buffer member is a metal, it said the cushioning member and the portion abutting the neighboring portion is formed as a polymerized unit that is bent on the side opposite to the front Stories blade side The focal plane shutter for a camera according to claim 1.

Images