JP2019015891A - Focal plane shutter and imaging device - Google Patents

Abstract

To provide a focal plane shutter capable of reducing frictions caused during a blade operation.SOLUTION: A focal plane shutter comprises: a base plate including a first opening; a cover plate including a second opening; an intermediate plate including a third opening; a first blade arranged between the base plate and the intermediate plate and for switching between a state in which the first, second, and third openings are covered and a state in which the first, second, and third openings are opened; a second blade arranged between the intermediate plate and the cover plate and for switching between a state in which the first, second, and third openings are covered and a state in which the first, second, and third openings are opened; and a driving unit which drives the first and second blades. The intermediate plate includes a first protrusion part protruding toward the first blade at a position facing the first blade, and a second protrusion part protruding toward the second blade at a position facing the second blade.SELECTED DRAWING: Figure 1

Description

  One embodiment of the present invention relates to a focal plane shutter or the like used in an imaging device such as a camera.

  In a focal plane shutter that exposes an image sensor by opening and closing an opening (also referred to as an exposure opening or an image frame) with a shutter blade, a shutter blade disposed in a blade chamber formed between the base plate and the cover plate Is driven by a drive mechanism to change the open / closed state of the opening, and exposure is performed. The shutter blade is connected to one end of the arm by a connecting tool such as a rivet, and the other end of the arm is connected to the drive mechanism. During the operation of the shutter, the shutter blades move as the driving force is transmitted to the shutter blades via the arm by the drive mechanism. At this time, abrasion powder is generated due to friction between the coupling tool and the shutter blades and the main plate. There are things to do. If these abrasion powders and dust adhere to the image sensor, the quality of the imaging result is deteriorated. For example, in Patent Document 1, a focal plane shutter for a camera using an adhesive sheet is used in order to prevent wear powder and dust from flying to the imaging surface. It is disclosed. Patent Document 2 discloses a configuration in which a plurality of honeycomb-shaped holes are formed in the shutter base plate. In this configuration, the friction between the shutter base plate and the blades is reduced.

JP 2003-280066 A JP 2001-350175 A

  In the focal plane shutter having the above-described conventional configuration, it is possible to reduce wear powder and dust from adhering to the imaging surface. However, in recent years, there is a higher demand for image quality improvement. Therefore, a configuration that can more effectively prevent wear powder and dust from adhering to the imaging surface is required. In the configuration described in Patent Document 2, although the friction between the shutter base plate and the blade is reduced, the friction of the blade may not be sufficiently reduced.

  The present invention adopts the following means in order to solve the above problems. In the following description, in order to facilitate understanding of the invention, reference numerals and the like in the drawings are appended in parentheses, but each component of the present invention is not limited to these appendices. It should be construed broadly to the extent that contractors can technically understand.

One means of the present invention is to
A ground plane (1) having a first opening;
A cover plate (2) having a second opening;
An intermediate plate (3) having a third opening;
A first blade (5) that is disposed between the ground plate and the intermediate plate, and switches between a state of covering and opening the first opening, the second opening, and the third opening;
A second blade (4) that is disposed between the intermediate plate and the cover plate and switches between a state of covering and opening the first opening, the second opening, and the third opening;
A drive unit (8) for driving the first blade and the second blade;
The intermediate plate has first protrusions (32a to 32f, 34) protruding toward the first blade (5) at a position facing the first blade, and a position facing the second blade. A second protrusion (31a to 31f, 33a, 33b) protruding toward the second blade (4),
It is a focal plane shutter.

  According to the focal plane shutter having the above-described configuration, the first protrusion and the second protrusion are in contact with the first blade and the second blade in a relatively narrow contact area such as point contact, respectively. And the friction with a 1st blade | wing and a 2nd blade | wing can be reduced. Thereby, generation | occurrence | production of the abrasion powder and dust which generate | occur | produce by the friction at the time of blade | wing operation | movement can be suppressed.

In the focal plane shutter, preferably,
The intermediate plate has a plurality of first protrusions (32a to 32f, 34) and a plurality of second protrusions (31a to 31f, 33a, 33b).

  According to the focal plane shutter having the above-described configuration, for example, the first blade and the second blade, the first protrusion, and the second protrusion in the relatively wide range or the entire range of the operation region of the first blade and the second blade. It is possible to adopt a configuration in which and are in contact with each other. Thereby, the friction between the intermediate plate, the first blade and the second blade can be reduced more effectively, and the generation of wear powder and dust can be more effectively suppressed.

In the focal plane shutter, preferably,
The first blade (5) includes a plurality of first blade members,
The plurality of first protrusions are arranged along the traveling direction at intervals shorter than the length in the traveling direction of the first blade member closest to the intermediate plate among the plurality of first blade members.

  According to the focal plane shutter having the above-described configuration, the first blade can always be in contact with the first protrusion when the first blade is running (operation), and the friction between the first blade and the intermediate plate is more effective. Can be suppressed. Thereby, generation | occurrence | production of an abrasion powder and refuse can be suppressed more effectively.

In the focal plane shutter, preferably,
The second blade (4) includes a plurality of second blade members,
The plurality of second protrusions are arranged along the traveling direction at intervals shorter than the length in the traveling direction of the second blade member closest to the intermediate plate among the plurality of second blade members.

  According to the focal plane shutter having the above configuration, the second blade can always be in contact with the second protrusion when the second blade is running (operating), and the friction between the second blade and the intermediate plate can be more effectively achieved. Can be suppressed. Thereby, generation | occurrence | production of an abrasion powder and refuse can be suppressed more effectively.

In the focal plane shutter, preferably,
The first protrusion and the second protrusion are formed on a side portion of the third opening opposite to a side portion of the first opening where the driving unit is disposed.
According to the focal plane shutter having the above-described configuration, in the first blade and the second blade, the first blade and the second blade are in the vicinity of the end opposite to the end connected to the drive unit, and the first blade and the second blade are the first protrusion and It will be in contact with the second protrusion. Thereby, it can be set as the structure which supports a 1st blade | wing and a 2nd blade | wing with a 1st projection part and a 2nd projection part more stably.

In the focal plane shutter, preferably,
The intermediate plate (3) is made of metal.

  According to the focal plane shutter having the above configuration, the intermediate plate is made of a metal that is easy to process as compared with other members such as a resin, so that it has sufficient rigidity, and the first protrusion and the second have high accuracy. A protrusion can be formed.

In the focal plane shutter, preferably,
The first protrusion (34) is formed to extend in the traveling direction of the first blade (5).

  According to the focal plane shutter having the above configuration, since the first blade can be linearly supported, the first blade and the first protrusion in a relatively wide range or the entire range of the operation region of the first blade. It can be set as the structure which touches a part, and can be set as the structure which supports a 1st blade | wing more stably by a 1st projection part. Thereby, the friction between the intermediate plate and the first blade can be more effectively reduced, and the generation of wear powder and dust can be more effectively suppressed.

In the focal plane shutter, preferably,
The second protrusions (33a, 33b) are formed to extend in the traveling direction of the second blade (4).

  According to the focal plane shutter having the above configuration, the second blade can be linearly supported. Therefore, the second blade and the second protrusion are formed in a relatively wide range or the entire range of the operation region of the second blade. It can be set as the structure which contacts a part, and can be set as the structure which supports a 2nd blade | wing more stably by a 2nd projection part. Thereby, the friction between the intermediate plate and the second blade can be reduced more effectively, and the generation of wear powder and dust can be more effectively suppressed.

  Any of the above focal plane shutters is suitably applied to an imaging apparatus such as a camera.

  According to the imaging apparatus as described above, during operation of the blade, wear powder and dust are less likely to be generated due to friction between the blade and the intermediate plate. Therefore, it is possible to suppress a decrease in quality of an image captured by the imaging device.

FIG. 1 is a plan view of a focal plane shutter in a blade travel standby state according to the first embodiment. FIG. 2 is a plan view of the focal plane shutter according to the first embodiment in a blade travel completion state. FIG. 3 is a schematic cross-sectional view of a characteristic portion of the focal plane shutter according to the first embodiment. FIG. 4 is a cross-sectional view of the leading blade side protrusion in the first embodiment. FIG. 5 is a cross-sectional view of the rear blade side protrusion in the first embodiment. FIG. 6 is a plan view of the focal plane shutter in the blade travel standby state according to the second embodiment. FIG. 7 is a cross-sectional view of the leading blade side protrusion in the second embodiment. FIG. 8 is a cross-sectional view of the rear blade side protrusion in the second embodiment.

  The focal plane shutter of the present invention is used in an imaging device such as a digital camera, and the intermediate plate has a protrusion in order to reduce friction between the blade and the intermediate plate during the operation of the blade in the shutter. This is one of the features.

An embodiment according to the present invention will be specifically described according to the following configuration with reference to the drawings. However, the embodiment described below is merely an example of the present invention and does not limit the technical scope of the present invention. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and the description may be abbreviate | omitted.
1. Embodiment 1
2. Embodiment 2
3. Supplementary matter

<1. Embodiment 1>
The conventional focal plane shutter including the focal plane shutter according to the present embodiment includes a ground plate, a cover plate, and an intermediate plate as described below, and a front blade is disposed between the ground plate and the intermediate plate. The rear blade may be arranged between the intermediate plate and the intermediate plate. At this time, the leading blade and the trailing blade are relatively often designed to operate along the intermediate plate during operation. Therefore, during the operation of the blades, the leading blades and the trailing blades operate while rubbing against the intermediate plate. In the present embodiment, attention is paid to this point, and the protrusion is provided in the portion where the intermediate plate slides with the blade. This will be specifically described below.

  1 and 2 are plan views of the focal plane shutter according to the present embodiment. FIG. 1 shows a blade travel standby state, and FIG. 2 shows a blade travel completion state. FIG. 3 is a schematic diagram of a cross section of the focal plane shutter of the present embodiment. That is, FIG. 3 shows the characteristic part in an easy-to-understand manner, and is not a cross-sectional view of the specific part. 4 and 5 are enlarged sectional views of the leading blade side protrusion and the trailing blade side protrusion, respectively.

  As shown in FIGS. 1 to 3, the focal plane shutter of the present embodiment includes a base plate 1, a cover plate 2, an intermediate plate 3, a leading blade 4, a trailing blade 5, leading blade arms 61 and 62, and trailing blades. The arm 71 and 72 and the drive part 8 are comprised. The drive unit 8 includes drive levers 81 and 82.

<Ground plate 1>
The base plate 1 is a substrate portion of a focal plane shutter and has a rectangular opening 1a. The opening 1a may not be a complete rectangular shape. As shown in FIG. 1, a drive unit 8 is mounted on a side position (right side in the drawing) of the opening 1 a of the ground plane 1. The shape of the opening 1a is not limited to a rectangle, and an arbitrary shape may be adopted. The opening 1a is an example of the “first opening” in the present invention.

<Cover plate 2>
The cover plate 2 is attached to the base plate 1 at a position facing the base plate 1 with a predetermined interval. The cover plate 2 is disposed at a position close to the image sensor in a camera equipped with a focal plane shutter. However, the orientation of the ground plane 1 and the cover board 2 with respect to the position of the image sensor can be arbitrarily changed. Between the main plate 1 and the cover plate 2, an intermediate plate 3, a leading blade 4, a trailing blade 5, and the like are arranged. The cover plate 2 has an opening 2 a formed at a position facing the opening 1 a of the base plate 1. The opening 2a has a rectangular shape similar to that of the opening 1a. However, the opening 2a may not be a complete rectangular shape, or may have an arbitrary shape other than a rectangular shape. The opening 2a is an example of the “second opening” in the present invention. The cover plate 2 may be called “auxiliary ground plate” or the like.

<Front blade 4>
The leading blade 4 is disposed between the cover plate 2 and the intermediate plate 3. The leading blade 4 is composed of a plurality of substantially rectangular and plate-shaped blade members, and is sometimes referred to as a “leading blade group”. The leading blade 4 is connected to the drive unit 8 via leading blade arms 61 and 62 connected by a connecting tool. The leading blade 4 is driven by the driving unit 8 to switch between a state of covering and opening the exposure opening formed by the openings 1a, 2a, and 3a (an open / close state). The leading blade 4 travels from the upper side to the lower side in FIGS. 1 and 2. The leading blade 4 is disposed at a position closer to the image sensor than the trailing blade 5. The leading blade 4 and the trailing blade 5 are each formed of metal such as aluminum, carbon fiber, or resin. The leading blade 4 is an example of the “second blade” in the present invention.

  As shown in FIG. 3, a plurality of (for example, four) blade members constituting the leading blade 4 are stacked in the optical axis direction. In the blade member constituting the leading blade 4, the blade member positioned first in the traveling direction (the blade member shown on the lower side in FIG. 1) is disposed closest to the intermediate plate 3. Therefore, in the front blade 4, the blade member located closest to the front side in the traveling direction is in contact with the intermediate plate 3. Note that the stacking order of the leading blades 4 may be changed.

<Rear blade 5>
The rear blade 5 is disposed between the main plate 1 and the intermediate plate 3. The rear blade 5 is composed of a plurality of substantially rectangular plate-shaped blade members, and is sometimes referred to as a “rear blade group”. The rear blade 5 is connected to the drive unit 8 via rear blade arms 71 and 72 connected by a connector. The rear blade 5 is driven by the driving unit 8 to switch between a state of covering and opening an exposure opening formed by the openings 1a, 2a, and 3a (an open / close state). The rear blade 5 travels from the upper side to the lower side in FIGS. 1 and 2. The rear blade 5 is an example of the “first blade” in the present invention.

  As shown in FIG. 3, a plurality of (for example, four) blade members constituting the rear blade 5 are stacked in the optical axis direction. In the blade member constituting the rear blade 5, the blade member (the blade member shown on the upper side in FIG. 2) located rearward in the traveling direction is disposed closest to the intermediate plate 3. Therefore, in the rear blade 5, the blade member positioned most rearward in the traveling direction comes into contact with the intermediate plate 3. The order in which the rear blades 5 are stacked may be changed.

<Intermediate plate 3>
The intermediate plate 3 is disposed between the base plate 1 and the cover plate 2, and forms a blade chamber that accommodates the rear blade 5 and the leading blade 4 between the base plate 1 and the cover plate 2. That is, the rear blade 5 is disposed between the base plate 1 and the intermediate plate 3, and the front blade 4 is disposed between the cover plate 2 and the intermediate plate 3. The cover plate 2, the leading blade 4, the intermediate plate 3, the trailing blade 5, and the base plate 1 are arranged in order from the image pickup device mounted on the camera. The intermediate plate 3 has a rectangular opening 3 a at a position facing the opening 1 a of the base plate 1 and the opening 2 a of the cover plate 2. Similar to the openings 1a and 2a, the opening 3a of the intermediate plate 3 may have any shape that is not rectangular.

  As shown in FIGS. 1 to 3, the intermediate plate 3 has leading blade side protrusions 31 a to 31 f and rear blade side protrusions 32 a to 32 f. FIG. 4 is a cross-sectional view of the leading blade side protrusions 31a to 31f, and FIG. 5 is a cross-sectional view of the trailing blade side protrusions 32a to 32f. As shown in FIGS. 3 to 5, the leading blade side protrusions 31 a to 31 f are formed on the intermediate plate 3 so as to protrude toward the leading blade 4 at positions facing the leading blade 4. Similarly, the rear blade side protrusions 32 a to 32 f are formed on the intermediate plate 3 so as to protrude toward the rear blade 5 at positions facing the rear blade 5. The leading blade side protrusions 31 a to 31 f and the trailing blade side protrusions 32 a to 32 f are all spherical in shape when viewed from above, and make point contact with the leading blade 4 and the trailing blade 5. That is, the leading blade side protrusions 31 a to 31 f and the trailing blade side protrusions 32 a to 32 f are convex portions formed on the intermediate plate 3.

  The leading blade side protrusions 31a to 31f and the trailing blade side protrusions 32a to 32f are formed on the side portion of the opening 3a of the intermediate plate 3 opposite to the position where the driving unit 8 is disposed. In other words, the leading blade side protrusions 31a to 31f are disposed in the vicinity of the end opposite to the end connected to the arm of the driving unit 8 in the blade member constituting the leading blade 4 arranged closest. Is done. Further, the rear blade side protrusions 32a to 32f are disposed in the vicinity of the end portion on the opposite side to the end portion connected to the arm of the drive unit 8 in the blade member constituting the rear blade 5 disposed closest. Is done. Thus, at the time of operation, one of the leading blade 4 and the trailing blade 5 is connected to the arm, and the other is in contact with the leading blade side protrusions 31a to 31f and the trailing blade side protrusions 32a to 32f, respectively. Therefore, during operation, the leading blade 4 and the trailing blade 5 move while being supported in the vicinity of both end portions, and operate stably. The leading blade 4 operates while making point contact with the leading blade side protrusions 31a to 31f, and the trailing blade 5 operates while making point contact with the trailing blade side protrusions 32a to 32f. , And the wear of the intermediate plate 3 can be reduced as compared with the prior art.

  Further, the leading blade side protrusions 31 a to 31 f always maintain the state where one or more leading blade side protrusions 31 a to 31 f are in contact with the leading blade 4 during the operation of the leading blade 4. In order to reduce wear while supporting, the blades are arranged along the traveling direction at intervals shorter than the length of the blade member of the leading blade 4 in contact with the leading blade side protrusions 31a to 31f in the traveling direction. Similarly, the leading blade side protrusions 31a to 31f are arranged along the traveling direction at intervals shorter than the traveling direction length of the blade member of the trailing blade 5 in contact with the trailing blade side protrusions 32a to 32f when the trailing blade 5 operates. Arranged.

  The intermediate plate 3 may be formed of a thin resin plate member as compared with the base plate 1 and the cover plate 2, but in such a thin resin plate member, the leading blade side protrusions 31a to 31f are formed. In addition, it may be difficult to maintain sufficient rigidity when the rear blade side protrusions 32a to 32f are formed. Therefore, the intermediate plate 3 of the present embodiment is preferably formed of metal. Further, by using the intermediate plate 3 as a metal, the leading blade side protrusions 31a to 31f and the trailing blade side protrusions 32a to 32f can be formed with high accuracy.

<Lead blade arms 61 and 62, rear blade arms 71 and 72>
The leading blade arms 61 and 62 are disposed between the drive unit 8 and the leading blade 4 and are connected to the leading blade 4 by a connector. The leading blade arms 61 and 62 transmit the driving force generated by the driving unit 8 to the leading blade 4. More specifically, the leading blade arm 62 is connected to the driving lever 81 of the driving unit 8, and the leading blade arms 61 and 62 operate the leading blade 4 as the driving lever 81 operates. .

  Similarly to the leading blade arms 61 and 62, the trailing blade arms 71 and 72 are disposed between the drive unit 8 and the trailing blade 5, and are connected to the trailing blade 5 by a connector. The rear blade arms 71 and 72 transmit the driving force generated by the drive unit 8 to the rear blade 5. More specifically, the rear blade arm 72 is connected to the drive lever 82 of the drive unit 8, and the rear blade arms 71 and 72 operate the rear blade 5 as the drive lever 82 operates. .

<Drive unit 8>
The drive unit 8 is partly or wholly disposed on the side portion of the main plate 1 and operates by power supplied from the outside, and via the drive levers 81 and 82, the leading blade arms 61 and 62, and the trailing blades The leading blade 4 and the trailing blade 5 are driven via the arms 71 and 72. The drive unit 8 is, for example, a conventionally known electromagnetic actuator that includes a permanent magnet, a yoke, a coil, a coil spring, and the like, and operates with supplied electric power.

  The focal plane shutter according to the present embodiment is an image pickup apparatus that includes an image pickup element at a position inside the openings 1a, 2a, and 3a (exposure openings) in a plan view and on the side opposite to the subject (backward in the optical axis direction). Used in cameras). The image sensor is mounted on the substrate at a position closer to the cover plate 2 than the base plate 1 in the focal plane shutter. The imaging element is a photoelectric conversion element such as a CMOS sensor or a CCD, for example.

  In the focal plane shutter according to the present embodiment, as described above, the intermediate plate 3 has the leading blade side protrusions 31a to 31f at positions facing the leading blade 4, and the trailing blade side at a position facing the trailing blade 5. Since it has composition which has projection parts 32a-32f, leading blade side projection parts 31a-31f and rear blade side projection parts 32a-32f are comparatively narrow contact fields, such as point contact, respectively, front blade 4 and rear blade 5 Will come into contact. Therefore, friction between the intermediate plate 3, the front blade 4 and the rear blade 5 can be reduced. Thereby, generation | occurrence | production of the abrasion powder and dust which generate | occur | produce by the friction at the time of blade | wing operation | movement can be suppressed.

  In the focal plane shutter of the present embodiment, the intermediate plate 3 has a plurality of leading blade side protrusions and rear blade side protrusions instead of one. Therefore, the front blade 4 and the rear blade 5, the front blade side protrusions 31a to 31f, and the rear blade side protrusions 32a to 32f are present in a relatively wide range or the entire range of the operation region of the front blade 4 and the rear blade 5. It becomes possible to set it as the structure which touches, respectively. As a result, friction between the intermediate plate 3, the front blade 4 and the rear blade 5 can be reduced more effectively, and generation of wear powder and dust can be more effectively suppressed.

<2. Second Embodiment>
Next, Embodiment 2 of the present invention will be described. In the conventional focal plane shutter including the focal plane shutter according to the present embodiment, unlike the focal plane shutter according to the first embodiment, the leading blade side protrusion and the trailing blade side protrusion are not dots but lines, respectively. It is formed in contact with the blade 5. Since the focal plane shutter according to the present embodiment is the same as the focal plane shutter according to the first embodiment except for the characteristic portion, detailed description thereof will be omitted below. Hereinafter, the characteristic part of the focal plane shutter of this embodiment will be described.

  FIG. 6 is a plan view of the focal plane shutter according to the present embodiment in a blade travel standby state. 7 and 8 are enlarged cross-sectional views of the leading blade side protrusion and the trailing blade side protrusion, respectively.

  As shown in FIG. 6, the focal plane shutter of the present embodiment includes leading blade side protrusions 33 a and 33 b and a rear blade side protrusion 34 formed on the intermediate plate 3. As shown in FIGS. 6 to 8, the leading blade side protrusions 33 a and 33 b are formed in an arc shape along the traveling direction of the leading blade 4. Similarly, the rear blade side protrusion 34 is formed in an arc shape along the traveling direction of the rear blade 5. The number of the leading blade side protrusions 33a and 33b is two compared to the number of the leading blade side protrusions 34a. If the number of the leading blade side protrusions is one, it interferes with the trailing blade side protrusion 34. It is to do.

  In addition, the leading blade side protrusion and the trailing blade side protrusion may be integrally formed so as to be overlapped with each other. However, it is preferable to form the leading blade side protruding portion and the trailing blade side protruding portion independently because smoother blade operation is possible.

  In the focal plane shutter of the present embodiment, the leading blade side protrusions 33a and 33b are formed so as to extend in an arc shape along the traveling direction of the leading blade 4, as described above. The leading blade 4 and the leading blade side protrusions 33a and 33b are in contact with each other in a relatively wide range or the entire range of the operating region of the leading blade 4. Therefore, the focal plane shutter of the present embodiment can be configured to support the leading blade 4 more stably by the leading blade side protrusions 33a and 33b. Thereby, the friction between the intermediate plate 3 and the leading blade 4 can be more effectively reduced, and the generation of wear powder and dust can be more effectively suppressed.

  In the focal plane shutter of the present embodiment, as a configuration for the rear blade 5, similarly to the above, the rear blade-side protrusion 34 is formed so as to extend in an arc shape along the traveling direction of the rear blade 5. . The focal plane shutter of the present embodiment can be shaped to support the rear blade 5 linearly by this rear blade side protrusion 34, and in a relatively wide range or the entire range of the operation region of the rear blade 5, The rear blade 5 and the rear blade-side protrusion 34 are in contact with each other. Therefore, in the focal plane shutter of the present embodiment, the rear blade 5 can be configured to be supported more stably by the rear blade side protrusion 34. Thereby, friction between the intermediate plate 3 and the rear blade 5 can be more effectively reduced, and generation of wear powder and dust can be more effectively suppressed.

<2. Supplementary items>
The specific description of the embodiment of the present invention has been given above. The above description is merely an embodiment, and the scope of the present invention is not limited to this embodiment, but should be broadly interpreted to the extent that a person skilled in the art can grasp.

  In the above-described embodiment, the front blade 4 and the rear blade 5 included in the focal plane shutter have been described as having four blade members. However, the front blade 4 and the rear blade 5 each include one or a plurality of blade members. The structure which has a blade | wing member may be sufficient.

  The present invention is suitably applied as a focal plane shutter of an imaging apparatus such as a digital camera.

DESCRIPTION OF SYMBOLS 1 ... Ground plate 1a ... Opening part 2 ... Cover plate 2a ... Opening part 3 ... Intermediate | middle board 3a ... Opening part 31a-31f ... Leading blade side protrusion 32a-32f ... Rear blade side protrusion 33a, 33b ... Leading blade side protrusion 34 ... Rear blade side protrusion 4 ... Front blade 5 ... Rear blade 61, 62 ... Front blade arm 71, 72 ... Rear blade arm 8 ... Drive unit 81 ... Drive lever 82 ... Drive lever

Claims (9)

A main plate having a first opening;
A cover plate having a second opening;
An intermediate plate having a third opening;
A first blade that is disposed between the ground plate and the intermediate plate, and switches between a state of covering and opening the first opening, the second opening, and the third opening;
A second blade that is disposed between the intermediate plate and the cover plate, and switches between a state of covering and opening the first opening, the second opening, and the third opening;
A drive unit for driving the first blade and the second blade,
The intermediate plate has a first protrusion that protrudes toward the first blade at a position facing the first blade, and protrudes toward the second blade at a position facing the second blade. Having a second protrusion to
Focal plane shutter. The intermediate plate has a plurality of first protrusions and a plurality of second protrusions.
The focal plane shutter according to claim 1. The first blade includes a plurality of first blade members,
The plurality of first protrusions are arranged along the traveling direction at intervals shorter than the length in the traveling direction of the first blade member closest to the intermediate plate among the plurality of first blade members.
The focal plane shutter according to claim 2. The second blade includes a plurality of second blade members,
The plurality of second protrusions are arranged along the traveling direction at intervals shorter than the length in the traveling direction of the second blade member closest to the intermediate plate among the plurality of second blade members.
The focal plane shutter according to claim 2 or claim 3. The first projecting portion and the second projecting portion are formed on a side portion of the third opening portion, which is opposite to a side portion of the first opening portion where the driving unit is disposed.
The focal plane shutter according to any one of claims 1 to 4. The intermediate plate is formed of metal;
The focal plane shutter according to any one of claims 1 to 5. The first protrusion is formed extending in the traveling direction of the first blade,
The focal plane shutter according to claim 1. The second protrusion is formed extending in the traveling direction of the second blade,
The focal plane shutter according to claim 1 or 7. An imaging device comprising the focal plane shutter according to any one of claims 1 to 8.

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