JP2019015832A - Focal plane shutter and imaging device - Google Patents

Abstract

To provide a focal plane shutter capable of suppressing adhesion of abrasion powders and dust generated due to friction to an imaging unit when a shutter blade is operating.SOLUTION: A focal plane shutter comprises: a base plate including a first opening; a cover plate including a second opening at a position facing the first opening; a blade arranged between the base plate and the cover plate and for switching between a state in which the first and second openings are covered and a state in which the first and second openings are opened; a driving unit which drives the blade; and an arm coupled between the driving unit and the blase. The arm is coupled to the blade by a plurality of coupling tools. A groove part including a bottom part is formed around the coupling tools of the arm. An adhesive is arranged in the bottom part.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. Also, dust may be generated from members other than the shutter. 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.

JP 2003-280066 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.

  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 at a position facing the first opening;
A blade (4, 5) that is disposed between the ground plate and the cover plate and switches between a state of covering the first opening and the second opening and a state of opening;
A drive unit (8) for driving the blades;
An arm (61, 62, 71, 72) connected between the drive unit and the blade,
The arm is connected to the blade by a plurality of connectors (6a to 6d),
A groove portion (6e to 6h) having a bottom portion is formed in the vicinity of the coupling tool of the arm,
An adhesive is disposed on the bottom,
It is a focal plane shutter.

  According to the focal plane shutter having the above-described configuration, the wear powder and dust generated by the friction during the operation of the blades are captured by the adhesive disposed in the groove portion. Can be captured. As a result, it is possible to prevent wear powder and dust from scattering and adhering to the image pickup device, thereby reducing the image quality.

In the focal plane shutter, preferably,
The groove is formed between the plurality of connectors in plan view.

  According to the focal plane shutter having the above-described configuration, a groove portion having a relatively large area can be formed, so that abrasion powder and dust can be captured effectively.

In the focal plane shutter, preferably,
The groove is formed between the plurality of adjacent couplers in plan view.

  According to the focal plane shutter having the above-described configuration, it is possible to dispose the groove portion in a relatively wide range in the empty space on the arm, and it is possible to capture wear powder and dust more effectively.

In the focal plane shutter, preferably,
The groove portion is formed so as to surround the periphery of at least one of the connectors in plan view.

  According to the focal plane shutter having the above-described configuration, the groove portion can be disposed so as to easily suppress the abrasion powder and dust generated by the coupling tool from being scattered outside the region where the coupling tool is disposed. Thereby, wear powder and dust can be captured more effectively.

In the focal plane shutter, preferably,
The groove is formed so as to surround all of the plurality of connectors in plan view.
According to the focal plane shutter having the above configuration, it is possible to more effectively capture the wear powder and dust generated from all the coupling tools on the arm.

In the focal plane shutter, preferably,
Each of the plurality of connectors has a head and a shaft,
The groove is formed on the surface on which the head is disposed.

  According to the focal plane shutter having the above-described configuration, it is possible to capture wear powder and dust more effectively by disposing the groove portion on the surface on which the head of the coupler on which the wear powder is relatively easily generated is disposed. Can do.

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

  According to the camera as described above, it is possible to prevent wear powder, dust, and the like from being scattered around the focal plane shutter, such as the imaging unit. As a result, it is possible to suppress wear powder, dust, and the like from adhering to the imaging unit, and it is possible to suppress deterioration in the quality of an image captured by the camera.

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 an enlarged view of blades and arms of the focal plane shutter according to the first embodiment. FIG. 4 is a cross-sectional view of the vicinity of the coupler of the focal plane shutter according to the first embodiment.

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 2. FIG. Supplementary matter

<1. Embodiment>
The focal plane shutter according to the present invention is used in an imaging apparatus such as a digital camera, and has one of the features in the configuration for capturing abrasion powder or dust generated by the operation of the focal plane shutter. Specifically, the focal plane shutter according to the present embodiment is characterized in that a groove is formed on the surface of the arm and an adhesive is disposed at the bottom of the groove. 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 an enlarged view of the blade and the arm. FIG. 4 is an enlarged view of the vicinity of the coupler.

  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 base plate 1 and the cover plate 2, the intermediate plate 3, the leading blade 4, the trailing blade 5, leading blade arms 61 and 62, and trailing blade arms 71 and 72 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.

<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.

<Front blade 4>
The leading blade 4 is located between the cover plate 2 and the intermediate plate 3 as described above. The leading blade 4 is composed of a plurality of plate-like members and may be referred to as a “leading blade group”. The leading blade 4 is connected to the leading blade arms 61 and 62 via connecting tools 6a, 6b, 6c, and 6d. The leading blade 4 is driven by the driving unit 8 via the leading blade arms 61 and 62, and switches between a state in which the exposure opening formed by the openings 1a, 2a, and 3a is covered and a state in which it is opened (open / closed state). . 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.

<Rear blade 5>
The rear blade 5 is located between the base plate 1 and the intermediate plate 3 as described above. The rear blade 5 is composed of a plurality of plate-like members similarly to the front blade 4 and is sometimes referred to as a “rear blade group”. The rear blade 5 is connected to the two rear blade arms 71 and 72 via a connector. The rear blade 5 is driven by the drive unit 8 through the rear blade arms 71 and 72 together with the front blade 4 to cover and open the exposure opening formed by the openings 1a, 2a and 3a. Switch.

<Lead blade arms 61 and 62>
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. .

  As shown by the hatched portion in FIG. 3, grooves 6e, 6f, 6g, and 6h are formed on one surface of the leading blade arms 61 and 62.

  The groove 6 e surrounds the area where the couplers 6 a to 6 d are arranged on one surface of the leading blade arm 61 and is formed at a position slightly inside the edge of the leading blade arm 61. An adhesive that adsorbs and captures wear powder and dust is disposed at the bottom of the groove 6e. The adhesive may be a sheet-like adhesive such as an adhesive tape, or a liquid adhesive. However, it is preferable to use a sheet-like adhesive such as an adhesive tape because work efficiency in the assembly process is improved.

  As shown in FIG. 4, the connector 6a is a rivet having a head portion and a shaft portion. The groove 6e is a recess having a bottom that is recessed from the same surface as the side on which the head of the connector 6a is disposed. An adhesive is disposed on the bottom of the groove 6e. The adhesive disposed in the groove 6e protrudes outward from the groove 6e in order to prevent the adhesive from adhering to other members or causing malfunction due to contact with other members during operation. Arranged not to. In order to maintain the strength of the leading blade arm 61, the groove portion 6e is formed as a concave portion having a depth not more than half the thickness of the leading blade arm 61. In addition, about connection tools other than the connection tool 6a, it is the structure similar to the connection tool 6a.

  Since the head of the connector is a portion that slides with other parts during operation and is a portion where wear powder and dust are relatively easily generated, the groove is formed on the same surface as the side on which the head of the connector 6a is disposed. By forming the groove portion including 6e, it is possible to capture wear powder, dust, and the like more effectively.

  The groove 6f is arranged between the coupling tools 6a and 6b so as not to overlap the groove 6e. The groove 6g is disposed between the coupling tools 6b and 6c and does not overlap with the groove 6e, and the groove 6h is disposed between the coupling tools 6c and 6d and does not overlap with the groove 6e. Yes. That is, the groove portions 6f to 6h are formed between all of the adjacently disposed connectors in the connectors 6a to 6d that connect the leading blade arm 61 and the leading blade 4. The characteristics of these groove parts 6f-6h are similar to the groove part 6e, and are formed as a recessed part which has a bottom part recessed from the same surface as the side where the head part of the connector 6a is arrange | positioned similarly to the groove part 6e. Similar to the groove 6e, an adhesive is disposed on the bottom of these grooves 6f to 6h.

  In the vicinity of the focal plane shutter, wear powder and dust having a size of approximately 100 μm or less are generated. Therefore, it is preferable to form the groove portions 6e to 6h with a width of 100 μm or more in order to capture all of the wear powder and dust of about 100 μm or less. Further, in order to avoid the captured wear powder and dust from coming into contact with other members, the groove portions 6e to 6h are preferably formed to have a depth of 100 μm or more. However, as shown in FIG. 3, since the width of the groove 6e is often smaller than the grooves 6f to 6h, the grooves 6f to 6h have a width of 100 μm or more, and the groove 6e has a width of less than 100 μm. It may be formed. Moreover, only a specific one of the groove portions 6e to 6h may have a width of 100 μm or more.

  Note that the groove portions 6e to 6h are not necessarily formed at the same time, and any of the groove portions may not be formed.

<Rear blade arms 71 and 72>
The rear blade arms 71 and 72 are disposed between the drive unit 8 and the rear blade 5 and are connected to the rear 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 in synchronization with the operation of the drive lever 82. Let

  The rear blade arms 71 and 72 have the same groove as the leading blade arms 61 and 62, but have the same configuration as the leading blade arms 61 and 62. Omitted.

  The groove portions may not be formed in all of the leading blade arms 61 and 62 and the trailing blade arms 71 and 72, and the groove portions may be formed in only some of the arms.

<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. The imaging element is an example of the “imaging unit” in the present invention.

  In the focal plane shutter of this embodiment, as described above, at least one of the leading blade arms 61 and 62 and the trailing blade arms 71 and 72 is formed with a groove portion having a bottom portion formed around the coupling tool. The adhesive is arranged in the groove. With this configuration, the focal plane shutter according to the present embodiment can capture wear powder and dust generated by friction during the operation of the blades with an adhesive, and capture wear powder and dust more effectively than before. It becomes possible to do. As a result, it is possible to prevent wear powder and dust from scattering and adhering to the image pickup device, thereby reducing the image quality.

  Moreover, in the structure of this embodiment, since the groove part is formed between the coupling tools, the groove part of a comparatively big area can be formed, and abrasion powder and garbage can be captured effectively.

  Further, in the configuration of the present embodiment, since the groove portions are formed between all the adjacently arranged couplers, it is possible to arrange the groove portions in a relatively wide space on the arm. Thus, wear powder and dust can be captured more effectively.

  In addition, in the configuration of the present embodiment, the groove is formed so as to surround the coupling tool in plan view, and therefore it is possible to more effectively capture the wear powder and dust generated from the coupling tool on the arm. it can.

<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 focal plane shutter of the above embodiment, the configuration example having the intermediate plate 3 has been described. However, a configuration without the intermediate plate 3 may be employed.

  In the above embodiment, the pressure-sensitive adhesive disposed in the groove may be made of a material to which dust is attached by providing electrostatic properties. However, it is preferable to use a pressure-sensitive adhesive that is relatively excellent in the ability to adsorb wear powder or dust.

  In the above embodiment, the front blade 4 and the rear blade 5 included in the focal plane shutter have been described as having a plurality of blade members. However, the front blade 4 and the rear blade 5 each have a single blade member. It may be a configuration.

  In the embodiment, the focal plane shutter including the leading blade 4 and the trailing blade 5 has been described. However, a configuration including only one of the leading blade 4 and the trailing blade 5 may be employed.

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

DESCRIPTION OF SYMBOLS 1 ... Base plate 1a ... Opening part 2 ... Cover plate 2a ... Opening part 3 ... Intermediate | middle board 3a ... Opening part 4 ... Front blade 5 ... Rear blade 61, 62 ... Lead blade arm 6a-6d ... Connecting tool 6e-6h ... Groove part 71, 72 ... rear blade arm 8 ... drive unit 81, 82 ... drive lever

Claims (7)

A main plate having a first opening;
A cover plate having a second opening at a position facing the first opening;
A blade that is disposed between the ground plate and the cover plate, and switches between a state of covering the first opening and the second opening and a state of opening;
A drive unit for driving the blade;
An arm connected between the drive unit and the blade,
The arm is connected to the blade by a plurality of connectors,
A groove portion having a bottom is formed in the vicinity of the coupling tool of the arm,
An adhesive is disposed on the bottom,
Focal plane shutter. The groove is formed between the plurality of connectors in plan view.
The focal plane shutter according to claim 1. The groove is formed between the plurality of adjacent connectors in plan view,
The focal plane shutter according to claim 2. The groove is formed so as to surround the periphery of at least one of the connectors in plan view.
The focal plane shutter according to any one of claims 1 to 3. The groove is formed so as to surround all of the plurality of connectors in plan view.
The focal plane shutter according to any one of claims 1 to 4. Each of the plurality of connectors has a head and a shaft,
The groove is formed on the surface on the side where the head is disposed.
The focal plane shutter according to any one of claims 1 to 5. An imaging device comprising the focal plane shutter according to any one of claims 1 to 6.

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