JP2020020882A - Focal plane shutter and imaging apparatus - Google Patents

Abstract

To provide a focal plane shutter in which dispersion of dust can be suppressed, which is generated by frictions when a shutter blade operates.SOLUTION: The focal plane shutter includes: a bottom board having an opening and a first axis of rotation; a first blade for switching a state in which the opening is covered and a state in which the opening is released; a first arm, which rotates around the first axis of rotation and is connected to an end side of the first blade; a first driving pin for driving the first arm; a first blade pressing board overlapping with the first blade on at least another end, the first blade pressing board having a first hole part with an adhesive in the moving region of the first blade.SELECTED DRAWING: Figure 1

Description

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

  In a focal plane shutter that exposes an image pickup device by opening and closing an opening (also referred to as an exposure opening) with shutter blades, a shutter mechanism disposed in a blade chamber formed between a base plate and a cover plate drives a shutter blade. By driving, the open / close state of the opening is changed, and exposure is performed. In such a focal plane shutter, each component slides and frictions with each other as the blades are driven to generate abrasion powder or the like, and the abrasion powder enters the travel space of the blade or the abrasion powder enters the image sensor. It may adhere. When abrasion powder enters the running space of the blade, the running of the blade may be affected. Further, if wear powder adheres to the image sensor, the quality of a captured image may be reduced. By the way, Patent Document 1 discloses a configuration in which through holes are formed in a shutter base plate and an auxiliary base plate, and an adhesive sheet is attached. Patent Document 2 discloses a configuration including an adjacent plate having a through hole.

JP 2003-280066 A JP 2015-125370 A

  In the focal plane shutter, the blades are driven by interposing an arm between the blades and the driving mechanism. At this time, sliding of the blades with other members generates wear powder such as resin and metal. In particular, it has been found that as the distance from the connecting portion between the arm and the blade, which becomes the fulcrum of the blade, increases, more wear powder is generated. This is considered to be due to the fact that the blade flutters as the distance from the connecting portion between the arm and the blade, which becomes the fulcrum of the blade, increases. In other words, large friction is generated between the blade and the blade pressing plate that presses the tip of the blade during operation, and a relatively large amount of wear powder such as resin and metal is generated. In recent years, further improvement in quality has been demanded, and a focal plane shutter configured to effectively suppress the scattering of such abrasion powder has been demanded. In this regard, in the configuration described in Patent Literature 1, dust such as abrasion powder generated by sliding of the blade and the blade holding plate at a position away from the arm may not be sufficiently captured. Further, the configuration described in Patent Literature 2 is a configuration for reducing generation of static electricity, and the effect of capturing dust such as abrasion powder in the first place could not be expected so much.

  The present invention employs the following means in order to solve the above problems. In the following description, reference numerals and the like in the drawings are added in parentheses to facilitate understanding of the invention, but each component of the present invention is not limited to these additions, and the present invention is not limited thereto. It should be widely interpreted to a technically understandable range by a trader.

The first means of the present invention is:
A base plate (1) having an opening (1a) and first rotation axes (13, 14);
First blades (4, 5) for switching between a state of covering the opening and a state of opening,
A first arm (61, 71) that rotates about the first rotation axis and is connected to one end of the first blade;
A first drive pin for driving the first arm (61, 71);
A first blade holding plate (81, 82, 83, 84) arranged to overlap at least the other end side of the first blade,
The first blade holding plate has first holes (81a, 82a, 83a1, 83a1, 83a2, 84a) in which a pressure-sensitive adhesive is disposed, in a moving area of the first blade.
It is a focal plane shutter.

  According to the focal plane shutter having the above-described configuration, the first hole is disposed near the position where the first blade and the blade holding plate slide, so that abrasion powder generated by the sliding is scattered to the image sensor. Adherence and accumulation in the drive mechanism can be suppressed. Thereby, it is possible to suppress a malfunction of the blade due to the abrasion powder and a decrease in image quality of a captured image.

In the focal plane shutter, preferably,
The first hole is a plurality of circular holes (81a, 82a).

  According to the focal plane shutter having the above configuration, the hole can be formed relatively easily by processing the base plate, so that the configuration including the configuration for preventing the abrasion powder from scattering is relatively simple and low cost. it can.

The second means of the present invention comprises:
A base plate (1) having an opening (1a) and first rotation axes (13, 14);
First blades (4, 5) for switching between a state of covering the opening and a state of opening,
A first arm (61, 71) that rotates about the first rotation axis and is connected to one end of the first blade;
A first drive pin for driving the first arm;
A first blade holding plate (83, 84) disposed so as to overlap at least the other end side of the first blade.
The first blade holding plate has an arc-shaped first hole (83a1, 83a2, 84a) formed in a moving area of the first blade.
It is a focal plane shutter.

  According to the focal plane shutter having the above configuration, it is possible to adopt a configuration in which abrasion powder generated by sliding between the first blade and the first blade pressing plate can be captured by the arc-shaped first hole. Thereby, scattering of wear powder can be suppressed. In particular, when the first hole portion having a long hole shape is used, an effect of suppressing scattering of dust by the first hole portion can be obtained.

In the focal plane shutter, preferably,
The first hole is formed along a movement locus of the first blade, and an adhesive is disposed therein.

  According to the focal plane shutter having the above-described configuration, it is possible to employ a configuration in which abrasion powder can be more effectively captured by the arc-shaped first hole. Thereby, scattering of wear powder can be more effectively suppressed.

In the focal plane shutter, preferably,
The first hole is a through hole;
An adhesive sheet having an adhesive surface on the first blade side is attached to a surface of the first blade holding plate opposite to a surface facing the first blade.

  According to the focal plane shutter having the above configuration, it is possible to provide a configuration for preventing scattering of abrasion powder in forming the through hole in the base plate and attaching the adhesive sheet. Accordingly, a configuration including a configuration for preventing scattering of abrasion powder at a relatively simple and low cost can be achieved.

In the focal plane shutter, preferably,
The first hole is a groove, and the adhesive is disposed at a bottom of the groove,

  According to the focal plane shutter having the above-described configuration, a configuration in which the adhesive sheet is prevented from peeling off or affecting the sliding of the blades can be avoided as compared with the configuration using the adhesive sheet.

In the focal plane shutter, preferably,
The base plate has a second rotation axis,
A second blade that switches between a state of covering the opening and a state of opening the opening,
A second arm that rotates around the second rotation axis and is connected to one end of the second blade;
A second drive pin for driving the second arm;
A second blade holding plate disposed so as to overlap at least the other end side of the second blade,
The second blade holding plate has a second hole in which an adhesive is disposed on a movement trajectory on the other end side of the second blade.

  According to the focal plane shutter having the above configuration, for example, both the leading blade and the trailing blade can be configured to capture wear powder and suppress scattering. Thereby, scattering of wear powder can be more effectively suppressed.

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

  According to the imaging apparatus as described above, it is possible to provide a configuration in which dust such as wear powder is prevented from scattering and accumulating at a specific portion of the driving mechanism or adhering to the imaging element. As a result, it is possible to prevent a deterioration in the quality of an image captured by the imaging device while preventing an operation failure caused by the wear powder.

FIG. 1 is a plan view of a focal plane shutter before a blade travels in the first embodiment. FIG. 2 is a plan view of the focal plane shutter after the blade travels in the first embodiment. FIG. 3 is a sectional view of the focal plane shutter according to the first embodiment. FIG. 4 is a plan view of the blade holding plate for the front blade according to the first embodiment. FIG. 5 is a plan view of the blade holding plate for the rear blade of the first embodiment. FIG. 6 is a plan view of the focal plane shutter before the blade travels in the second embodiment. FIG. 7 is a plan view of the focal plane shutter after the blade travels in the second embodiment.

  The focal plane shutter of the present invention is used for an imaging device such as a digital camera, and a blade holding plate for capturing and suppressing scattering of dust such as abrasion powder generated by the operation of the blades of the focal plane shutter. Has one of the features.

An embodiment according to the present invention will be specifically described with reference to the drawings according to the following configuration. However, the embodiments described below are merely examples of the present invention, and do not limit the technical scope of the present invention. In the drawings, the same components are denoted by the same reference numerals, and description thereof may be omitted.
1. Embodiment 1
2. Embodiment 2
3. 3. Features of the present invention Supplementary information

<1. First Embodiment>
First, Embodiment 1 of the present invention will be specifically described. 1 and 2 are plan views of the focal plane shutter according to the present embodiment. FIG. 1 shows a state before the blade travels, and FIG. 2 shows a state after the blade travels. FIG. 3 is a sectional view of the focal plane shutter of the present embodiment. FIG. 4 shows the blade holding plate 81 for the front blade in the focal plane shutter of the present embodiment. FIG. 5 shows the blade holding plate 82 for the rear blade in the focal plane shutter of the present embodiment.

  As shown in FIGS. 1 and 2, the focal plane shutter according to the present embodiment includes a base plate 1, a cover plate 2, an intermediate plate 3, a front blade 4, a rear blade 5, a main arm 61 for a front blade, and a subarm for a front blade. The arm 62 includes a main arm 71 for a rear blade, a slave arm 72 for a rear blade, a blade holding plate 81 for a front blade, and a blade holding plate 82 for a rear blade. As shown in the cross-sectional view of FIG. 3, these configurations include the cover plate 2, the blade holding plate 81 for the front blade, the front blade 4, the intermediate plate 3, the rear blade 5, the blade holding plate 82 for the rear blade, and the main plate. 1 and are arranged in a stacked manner. In this specification, the leading blade 4 and the trailing blade 5 may be collectively referred to as “blades”. The main arm 61 for the front blade and the main arm 71 for the rear blade may be collectively referred to as a “main arm”. The leading arm 62 for the leading blade and the trailing arm 72 for the trailing blade may be collectively referred to as a "slave arm". Further, the main arm and the slave arm may be collectively referred to as “arm”.

<Main plate 1>
The base plate 1 is a substrate portion of the focal plane shutter and has a substantially rectangular opening 1a. The opening 1a may have any shape other than a rectangle. As shown in FIGS. 1 and 2, a driving unit (not shown) for driving the leading blade 4 and the trailing blade 5 is provided outside a blade chamber described later on the side (left side of the drawing) of the opening 1 a of the main plate 1. Will be installed. The drive unit has the same configuration as that of the related art including an electromagnetic actuator or a motor. The drive section has a drive pin for outputting power connected to the main arm 61 for the front blade and the main arm 71 for the rear blade, and transmits the power to the blade via these main arms. The description of the specific configuration of the driving unit is omitted.

  As shown in FIGS. 1 and 2, the main plate 1 rotatably supports a main arm 61 for the front blade in a blade chamber to be described later, and a rotation axis serving as a center of rotation of the main arm 61 for the front blade. 13. The main plate 1 rotatably supports a rear blade main arm 71 in a blade chamber described later, and has a rotation shaft 14 that is a center of rotation of the rear blade main arm 71. The rotating shafts 13 and 14 have, for example, a shaft-like configuration erected on the main plate 1. Through holes 11 and 12 are formed in the base plate 1 along the movement locus of the drive pin of the drive unit. The through holes 11 and 12 are long holes extending in an arc shape around the rotation shafts 13 and 14, respectively, and penetrate the main plate 1. A drive pin for the front blade 4 and a drive pin for the rear blade 5 are inserted into the through holes 11 and 12, respectively.

<Cover plate 2>
The cover plate 2 is attached to the base plate 1 at a predetermined interval at a position facing the base plate 1. The space between the cover plate 2 and the base plate 1 serves as a blade chamber for accommodating the leading blade 4 and the trailing blade 5. A space formed by the base plate 1 and the cover plate 2 or a space formed by the base plate 1, the cover plate 2 and the intermediate plate 3 may be referred to as a “blade chamber”. The cover plate 2 is arranged at a position close to an image pickup device (not shown) in an image pickup apparatus equipped with a focal plane shutter. However, the orientation of the base plate 1 and the cover plate 2 with respect to the position of the image sensor can be arbitrarily changed. In the blade chamber between the main plate 1 and the cover plate 2, the intermediate plate 3, the front blade 4, the rear blade 5, the main arm 61 for the front blade, the sub arm 62 for the front blade, the main arm 71 for the rear blade, the rear blade A slave arm 72, a blade holding plate 81 for a front blade, a blade holding plate 82 for a rear blade, 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 the opening 1a, but does not have to be a perfect rectangle, and may have any shape other than a rectangle.

<Intermediate plate 3>
The intermediate plate 3 is arranged between the main plate 1 and the cover plate 2. The rear blade 5, the main arm 71 for the rear blade, and the slave arm 72 for the rear blade are housed between the intermediate plate 3 and the main plate 1. The front blade 4, the main arm 61 for the front blade, and the slave arm 62 for the front blade are accommodated between the intermediate plate 3 and the cover plate 2. 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. Like the openings 1a and 2a, the opening 3a of the intermediate plate 3 may have any shape other than a rectangular shape.

<First wing 4>
The leading blade 4 is disposed in the blade chamber between the cover plate 2 and the intermediate plate 3 as described above. The front blade 4 is composed of a plurality of plate-like members 41 to 44, and is sequentially connected to the rotation center side from the distal end side of the front blade main arm 61 and the front blade sub arm 62 by connecting tools such as rivets. You. The leading blade 4 is connected to the leading arm main arm 61 and the leading blade slave arm 62 at the position where the driving unit is disposed (left side in the figure). The front blade 4 is driven by a front blade drive pin (not shown) via the front blade main arm 61, and covers the exposure opening formed by the openings 1a, 2a, and 3a and opens the exposure opening ( Open / close state). Each of the leading blade 4 and the trailing blade 5 is formed of a material such as metal such as aluminum, carbon fiber, or resin, but is not limited to these materials.

<Back wing 5>
The rear blade 5 is disposed in the blade chamber between the main plate 1 and the intermediate plate 3 as described above. The rear blade 5 is composed of a plurality of plate-like members 51 to 54 similarly to the front blade 4, and is connected to the center of rotation of the rear arm main arm 71 and the rear blade slave arm 72 from the tip side by a connecting tool such as a rivet. Are connected in order toward. The rear blade 5 is connected to the rear blade main arm 71 and the rear blade slave arm 72 at the position where the drive unit is disposed (left side in the figure). The rear blade 5 is driven by a rear blade drive pin (not shown) via the rear blade main arm 71, and covers and opens the exposure opening formed by the openings 1a, 2a, and 3a ( Open / close state).

<Main arm 61 for front blade>
The main arm 61 for the front blade drives the front blade 4. It is arrange | positioned between the drive pin for front blades, and the front blade 4, and is connected with the front blade 4 by a connection tool. Thus, the leading blade main arm 61 transmits the driving force generated by the driving unit to the leading blade 4 via the leading blade driving pin. The main arm 61 for the front blade rotates about the rotation shaft 13 of the main plate 1.

<Main arm 71 for rear blade>
The rear blade main arm 71 is configured to drive the rear blade 5 and has the same configuration as the front blade main arm 61. The main arm 71 for the rear blade is disposed between the drive pin for the rear blade and the rear blade 5, and is connected to the rear blade 5 by a connecting tool. As a result, the rear blade main arm 71 transmits the driving force generated by the driving unit to the rear blade 5 via the rear blade drive pin. The main arm 71 for the rear blade rotates about the rotation shaft 14 of the main plate 1.

<Front arm slave arm 62 and rear blade slave arm 72>
The leading blade slave arm 62 is connected to the leading blade 4 as described above. The leading blade slave arm 62 is rotatably connected to the shaft of the main plate 1 on the blade chamber side, similarly to the leading blade main arm 61. The leading blade slave arm 62 does not receive a driving force directly from the drive unit, and operates in accordance with the operation of the leading blade main arm 61. The trailing arm 72 is connected to the trailing blade 5 as described above. The rear arm 72 for the rear blade is rotatably connected to a shaft of the main plate 1 on the blade chamber side, similarly to the main arm 71 for the rear blade. The rear arm 72 for the rear blade receives no driving force directly from the driving unit, and operates in accordance with the operation of the main arm 71 for the rear blade.

<Drive pins for front and rear blades>
The driving pin for the front blade and the driving pin for the rear blade are respectively connected to a driving unit including an electromagnetic actuator and the like. The drive pin for the front blade and the drive pin for the rear blade are formed of, for example, metal. The drive unit is operated by electric power supplied from the outside, and transmits power to the front blade drive pin and the rear blade drive pin. The drive pin for the front blade and the drive pin for the rear blade drive the front blade 4 and the rear blade 5 via the main arm 61 for the front blade and the main arm 71 for the rear blade, respectively, to switch the open / close state of the opening 1a. . The running operation of the front blade 4 and the rear blade 5 is the same as the conventional configuration.

  The drive unit includes, for example, a permanent magnet, a yoke, a coil, a coil spring, and the like in addition to the drive pins for the front blade and the drive pin for the rear blade, and is operated by applied power. The drive unit includes a conventionally known electromagnetic actuator or motor.

<Front holding plate 81 for front blade>
The blade holding plate 81 for the front blade is disposed between the front blade 4 and the cover plate 2 (see FIG. 3). The blade holding plate 81 for the front blade is arranged so as to overlap the movement trajectory of the end of the front blade 4 opposite to the side connected to the arm. The blade holding plate 81 for the front blade is provided with a plurality of circular through holes at a position (moving region of the front blade 4) on the side opposite to the side connected to the arm and overlapping the movement locus of the end of the front blade 4. 81a (see FIGS. 1, 2 and 4). An adhesive sheet 81b is attached to a surface of the blade holding plate 81 for the front blade opposite to the surface facing the front blade 4 so as to cover the formation region of the plurality of through holes 81a (see FIG. 3). ). The surface of the adhesive sheet 81b on the front blade 4 side, that is, the surface on the opposite side to the cover plate 2 side is an adhesive surface having adhesiveness, and the surface on the cover plate 2 side has no adhesiveness. When viewed from the front blade 4 side, the pressure-sensitive adhesive surface of the pressure-sensitive adhesive sheet 81b is disposed behind a plurality of through holes 81a of the blade pressing plate 81 for the front blade. The adhesive sheet 81b captures abrasion powder generated by sliding or the like during the operation of the front blade 4 on the side opposite to the side connected to the arm.

<Back blade holding plate 82 for rear blade>
The rear blade holding plate 82 is disposed between the rear blade 5 and the main plate 1 (see FIG. 3). The rear-blade blade holding plate 82 is disposed so as to overlap the movement trajectory of the end of the rear blade 5 opposite to the side connected to the arm. The rear blade holding plate 82 is provided with a plurality of circular through holes at a position (moving area of the rear blade 5) on a side opposite to a side connected to the arm and overlapping a movement locus of an end of the rear blade 5. 82a (see FIGS. 1, 2 and 5). An adhesive sheet 82b is attached to a surface of the rear blade holding plate 82 opposite to the surface facing the rear blade 5 so as to cover the formation region of the plurality of through holes 82a (see FIG. 3). ). The surface of the adhesive sheet 82b on the rear blade 5 side, that is, the surface on the opposite side to the main plate 1 side is an adhesive surface having adhesiveness, and the surface on the main plate 1 side does not have adhesiveness. When viewed from the rear blade 5 side, the pressure-sensitive adhesive surface of the pressure-sensitive adhesive sheet 82b is disposed behind the plurality of through holes 82a of the rear blade pressure plate 82. The adhesive sheet 82b captures abrasion powder generated by sliding or the like during the operation of the rear blade 5 on the side opposite to the side connected to the arm.

<2. Embodiment 2>
Next, a second embodiment of the present invention will be specifically described. The configuration of the present embodiment differs from the configuration of the first embodiment in the configuration of the blade holding plate, and the other configurations are common. Here, only differences from the first embodiment will be described, and description of common points will be omitted.

  6 and 7 are plan views of the focal plane shutter of the present embodiment. FIG. 6 shows a state before the blade travels, and FIG. 7 shows a state after the blade travels.

  As shown in FIGS. 6 and 7, the front blade holding plate 83 and the rear blade holding plate 84 of the focal plane shutter of the present embodiment are the same as the front blade holding plate 81 and the rear blade of the first embodiment. The through-hole has a shape different from that of the blade holding plate 82. Specifically, the blade holding plate 83 for the front blade has two through holes 83a1 and 83a2 extending in an arc shape. The through-holes 83a1 and 83a2 are formed on the operation trajectories of the plate-like members 41 and 42 constituting the leading blade 4 and the ends of the ends of the 43 and 44 opposite to the side connected to the arm. An adhesive sheet 83b is attached to the surface of the blade holding plate 83 for the front blade opposite to the surface facing the front blade 4 so as to cover the area where the through holes 83a1 and 83a2 are formed (see FIG. 6). ).

  Similarly, the blade holding plate 84 for the rear blade has a through hole 84a extending in an arc shape. The through-hole 84a is formed along the movement trajectory of the end of the rear blade 5 composed of the plate-shaped members 51 to 54 on the side opposite to the side connected to the arm. An adhesive sheet 84b is attached to a surface of the rear blade holding plate 84 opposite to the surface facing the rear blade 5 so as to cover the formation region of the through hole 84a (see FIG. 7).

<3. Features of the present invention>
The present invention whose specific examples have been described as the first and second embodiments have the following features.

  The focal plane shutter of each embodiment includes a blade holding plate 81 or 83 for the front blade, and a blade holding plate 82 or 84 for the rear blade. In these blade holding plates, a side opposite to the side connected to the arm is provided. A through hole is formed in the moving area of the front blade 4 or the rear blade 5, and the adhesive sheets 81b to 84b are arranged. With such a configuration, the through-holes 81a to 84a in which the adhesive sheets 81b to 84b are arranged on the rear side are arranged near the position where the blade and the blade holding plate slide, so that the blade and the blade holding plate are It is possible to suppress the abrasion powder generated by sliding with other components including the scattered particles from adhering to the image pickup device and accumulating in the drive mechanism. With this configuration, it is possible to suppress a malfunction of the blade due to the abrasion powder and a decrease in image quality of a captured image.

  In each embodiment, the example in which the blade holding plate with the through hole is adopted for both the front blade 4 and the rear blade 5 has been described, but the blade holding plate with the through hole is formed only for one of them. May be adopted. Even in this case, a certain effect can be obtained on the capture of wear powder. At this time, when the through holes and the adhesive sheet are arranged on the blade holding plate of the front blade 4 and the rear blade 5 which is arranged closer to the image sensor, the scattered wear powder is prevented from adhering to the image sensor. May be preferred.

  Further, in each embodiment, the through holes formed in the blade holding plate are not limited to the circular shape as in the first embodiment and the arc shape as in the second embodiment, and various types of through holes are employed. May be. In this case, it is preferable that the formed through-holes are arranged at positions along the periphery of the movement trajectory of the end of the leading blade 4 and the trailing blade 5 which is opposite to the side connected to the arm.

  Further, in the embodiment, the through-hole is formed in the blade holding plate and the adhesive sheet is attached thereto, but a configuration may be adopted in which a groove is formed in the blade holding plate and an adhesive is disposed at the bottom of the groove. Such a configuration can prevent the pressure-sensitive adhesive sheet from peeling off or affecting the sliding of the blade, as compared with the configuration using the pressure-sensitive adhesive sheet.

  On the other hand, in the configuration using the pressure-sensitive adhesive sheet, it is possible to adopt a configuration for preventing scattering of abrasion powder in the process of forming the through-holes in the base plate 1 and attaching the pressure-sensitive adhesive sheet. Accordingly, a configuration including a configuration for preventing scattering of abrasion powder at a relatively simple and low cost can be achieved.

  In this specification, the through holes and the grooves are collectively referred to as “holes”.

  The first embodiment employs a configuration in which a plurality of circular through holes 81a and 82a are formed as through holes. In such a configuration, the through hole can be relatively easily formed by processing the base plate 1, so that a configuration including a configuration for preventing scattering of abrasion powder at a relatively simple and low cost can be achieved. In addition, similarly to the above, instead of the through hole, a groove in which an adhesive is disposed on the bottom may be adopted.

  The second embodiment employs a configuration in which arc-shaped through holes 83a1, 83a2, and 84a are formed as the through holes. With such a configuration, it is possible to adopt a configuration in which abrasion powder generated by sliding between the blade and the blade holding plate can be effectively captured. Thereby, scattering of wear powder can be more effectively suppressed.

  As in the second embodiment, the through holes 83a1 and 83a2 formed in an arc shape along the movement locus of the front blade 4 and the rear blade 5 of the front blade holding plate 83 and the rear blade holding plate 84. And / or 84a, a certain effect can be obtained in preventing the scattering of abrasion powder without necessarily arranging an adhesive such as the adhesive sheet 83b.

  The focal plane shutter of the present invention is suitably applied to an imaging device such as a camera having an imaging element. The imaging apparatus employing the focal plane shutter of the present invention can be configured to prevent dust such as abrasion powder from scattering and accumulating at a specific portion of the drive mechanism or adhering to the imaging device. As a result, it is possible to prevent a deterioration in the quality of an image captured by the imaging device while preventing an operation failure caused by the wear powder.

<3. Supplementary items>
The specific description of the embodiment of the present invention has been given above. The above description is merely a specific example, and the scope of the present invention is not limited to this embodiment but is widely interpreted to a range that can be understood by those skilled in the art.

  Further, in the embodiment, the front blade 4 and the rear blade 5 provided in the focal plane shutter have been described as having a plurality of blade members, respectively. However, the front blade 4 and the rear blade 5 each have a single blade member. May be provided.

  In the embodiment, the focal plane shutter including the front blade 4 and the rear blade 5 has been described. However, a configuration including only one of the front blade 4 and the rear blade 5 may be adopted. In this case, in the focal plane shutter of the embodiment, the configuration example including the intermediate plate 3 has been described, but a configuration not including the intermediate plate 3 may be adopted.

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

DESCRIPTION OF SYMBOLS 1 ... Ground plate 1a ... Opening 11,12 ... Through-hole 13, 14 ... Rotating shaft 2 ... Cover plate 2a ... Opening 3 ... Intermediate plate 3a ... Opening 4 ... Front blade 5 ... Rear blade 61 ... Main for front blade Arm 62: Slave arm for leading blade 71: Main arm for trailing blade 72: Slave arm for trailing blade 81, 83: Blade holding plate for front blade 82, 84 ... Blade holding plate for rear blade 81a-84a: Through hole 81b- 84b ... Adhesive sheet

Claims (8)

A base plate having an opening and a first rotation axis;
A first blade that switches between a state of covering the opening and a state of opening the opening,
A first arm that rotates about the first rotation axis and is connected to one end of the first blade;
A first drive pin for driving the first arm;
A first blade holding plate disposed so as to overlap at least the other end of the first blade,
The first blade holding plate has a first hole in which a pressure-sensitive adhesive is disposed, in a movement area of the first blade.
Focal plane shutter. The first hole is a plurality of circular holes,
The focal plane shutter according to claim 1. A base plate having an opening and a first rotation axis;
A first blade that switches between a state of covering the opening and a state of opening the opening,
A first arm that rotates about the first rotation axis and is connected to one end of the first blade;
A first drive pin for driving the first arm;
A first blade holding plate disposed so as to overlap at least the other end of the first blade,
The first blade holding plate has an arc-shaped first hole formed in a movement region of the first blade.
Focal plane shutter. The first hole is formed along a movement trajectory of the first blade, and an adhesive is disposed therein.
The focal plane shutter according to claim 3. The first hole is a through hole;
An adhesive sheet having an adhesive surface on the first blade side is attached to a surface of the first blade pressing plate opposite to a surface facing the first blade,
The focal plane shutter according to claim 1, 2 or 4. The first hole is a groove, and the adhesive is disposed at a bottom of the groove,
The focal plane shutter according to claim 1, 2 or 4. The base plate has a second rotation axis,
A second blade that switches between a state of covering the opening and a state of opening the opening,
A second arm that rotates around the second rotation axis and is connected to one end of the second blade;
A second drive pin for driving the second arm;
A second blade holding plate disposed so as to overlap at least the other end side of the second blade,
The second blade holding plate has a second hole in which an adhesive is disposed on a movement trajectory on the other end side of the second blade.
The focal plane shutter according to any one of claims 1 to 6.   An imaging apparatus comprising the focal plane shutter according to any one of claims 1 to 7.

Images