JP2017211595A - Focal plane shutter and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focal plane shutter that improve stiffness of a ground plate section that carries a drive mechanism unit.SOLUTION: A focal plane shutter includes: a ground plate having an opening for exposure; an auxiliary ground plate having an opening for exposure and is arranged with a predetermined interval to the ground plate; a blade group provided between the ground plate and the auxiliary ground plate; and a drive mechanism unit for driving the blade group provided on the ground plate. The ground plate is formed by coupling a first ground plate on which the drive mechanism unit is mounted with a second ground plate on which the opening is formed.SELECTED DRAWING: Figure 2

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.

  A focal plane shutter that exposes an image sensor or a film by opening and closing an opening (image frame) with a blade group, has a blade group disposed in a blade chamber formed between the base plate and the auxiliary base plate as a driving mechanism. There is a configuration in which exposure is performed by changing the opening / closing state of the opening by being driven by the unit. In such a focal plane shutter, there is a demand for increasing the rigidity of the main plate. For example, in Patent Document 1, an auxiliary ground plate made of a metal material is disposed on a shutter ground plate made of a synthetic resin material, thereby increasing the rigidity of the ground plate.

JP 2014-59348 A

  However, although the conventional technique can increase the rigidity of the entire ground plane, the thickness of the ground plane has been increased. On the other hand, in an imaging device such as a camera equipped with a focal plane shutter, it was discovered that a good result can be obtained by ensuring a large space for the blade chamber. However, in the conventional technology, the space for the blade chamber is secured. In addition, it has been difficult to increase the rigidity of the base plate while suppressing the thickness of the base plate.

  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 an opening for exposure;
An auxiliary base plate having an opening for exposure and arranged at a predetermined interval from the base plate;
A blade group (4, 5) disposed between the main plate and the auxiliary base plate;
A drive mechanism unit (8) for driving the blade group disposed on the base plate,
The ground plate is formed by connecting a first ground plate (11) on which the drive mechanism is mounted and a second ground plate (12) in which the opening is formed.
It is a focal plane shutter.

  According to the focal plane shutter having the above configuration, since the ground plane is formed separately, it is easy to form the first ground plane and the second ground plane with different materials and thicknesses. Therefore, it is possible to form the first ground plane on which the drive mechanism unit is mounted using a material having higher rigidity than the second ground plane and / or thicker than the second ground plane. On the other hand, the second ground plane can be formed to have lower rigidity and / or thickness than the first ground plane. Accordingly, it is possible to increase the rigidity of the portion on which the drive mechanism portion is mounted, while ensuring a wide space for accommodating the blade group. Furthermore, by ensuring a large accommodation space for the blade group, it is possible to suppress generation of dust such as wear powder due to sliding between the blade group and the ground plate.

In the focal plane shutter, preferably,
The second ground plane (12) is formed thinner than the first ground plane (11).

  According to the focal plane shutter having the above-described configuration, the second ground plate located around the opening in which the blade group is accommodated is formed thinner than the first ground plate, so that a relatively wide traveling space for the blade group is secured. However, the rigidity of the first ground plane portion on which the drive mechanism portion is mounted can be increased.

In the focal plane shutter, preferably,
The second ground plane is formed with a thickness less than half that of the first ground plane.

In the focal plane shutter, preferably,
The first ground plane and the second ground plane are made of different metals.

  According to the focal plane shutter having the above configuration, a material having higher rigidity than the second ground plane can be used as the material for the first ground plane. This makes it possible to increase the rigidity of the first ground plane portion that requires high rigidity in order to mount the drive mechanism section. In addition, since the second ground plane portion can be formed of a material having a relatively low rigidity, the cost of the entire focal plane shutter can be reduced.

In the focal plane shutter, preferably,
The second ground plane is partially thin.

  According to the focal plane shutter having the above configuration, it is possible to form a thin sliding portion of the blade group that requires a particularly large space on the second ground plane.

In the focal plane shutter, preferably,
The first ground plane is made of a material having higher rigidity than the second ground plane.

  According to the focal plane shutter having the above-described configuration, it is possible to provide a configuration capable of supporting the drive mechanism unit more stably.

  Further, the present invention includes an imaging device such as a camera provided with any of the above focal plane shutters.

  According to the imaging apparatus having the above-described configuration, the focal plane shutter having a wide traveling space of the blade group is provided while the mounting portion of the drive mechanism portion has high rigidity, and thus it can be configured with high durability. Become. Moreover, it can be set as the structure which suppressed generation | occurrence | production of the dusts, such as abrasion powder by sliding between a blade group and a ground plane, etc., preventing the fall of the image quality of the imaged image by such abrasion powder, etc. Is possible.

The top view of the focal plane shutter of this embodiment. The top view of the ground plane of this embodiment. Sectional drawing of the ground plane of this embodiment. Sectional drawing of the ground plane of the modification of this 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>
In the focal plane shutter of the present embodiment, a ground plate (shutter ground plate) is formed by connecting a first ground plate on which a drive mechanism unit is mounted and a second ground plate in which an opening is formed. One of the features is that they are formed of different thicknesses and materials. The focal plane shutter of this embodiment will be specifically described.

  1 and 2 are plan views of the focal plane shutter of the present embodiment. FIG. 2 is a plan view of the main plate in the focal plane shutter of the present embodiment. FIG. 3 is a cross-sectional view of the main plate of the present embodiment.

  As shown in FIG. 1, the focal plane shutter of this embodiment includes a base plate 1, an auxiliary base plate (not shown), an intermediate plate 3, a leading blade group 4, a trailing blade group 5, a drive mechanism unit 8, and the like. Consists of. The leading blade group 4 and the trailing blade group 5 may be collectively referred to as a “blade group”. The drive mechanism unit 8 is connected to the leading blade group 4 and the trailing blade group 5 via an arm. When the driving mechanism unit 8 operates, the driving force is transmitted to the leading blade group 4 and the trailing blade group 5 via the arm. As a result, the leading blade group 4 and the trailing blade group 5 operate to open and close the exposure opening.

<Ground plate 1>
The base plate 1 (shutter base plate) is a substrate portion of a focal plane shutter, and is formed with a rectangular opening 1a that functions as an exposure opening (image frame). As shown in FIG. 2, the ground plane 1 is formed by being separated into a first ground plane 11 including a portion on which the drive mechanism portion 8 is mounted and a second ground plane 12 including a portion where the opening 1 a is formed. The first ground plane 11 and the second ground plane 12 are connected by connecting portions 13 and 14. More specifically, connection holes 13a and 14a are formed in the first ground plane 11, and connection holes 13b and 14b are formed in the second ground plane 12. As shown in the cross-sectional view of FIG. 3, the first ground plane 11 and the second ground plane 12 are composed of a coupling tool 13c inserted into the coupling holes 13a and 13b, and a coupling tool inserted into the coupling holes 14a and 14b. 14c. For example, the connecting tools 13c and 14c are rivets or the like, and the first base plate 11 and the second base plate 12 are connected by caulking. However, the connecting tools 13c and 14c are not limited to rivets, and other members that can be connected may be used.

  Since the first ground plane 11 is a portion on which the drive mechanism unit 8 is mounted, since it includes various drive members, it is necessary to have high rigidity that can withstand vibration during operation. Therefore, the first ground plane 11 is formed of a material having higher rigidity than the second ground plane 12. The first ground plane 11 is made of, for example, aluminum or carbon steel (SK). The first ground plane 11 is formed thicker than the second ground plane 12.

  On the other hand, since the 2nd ground plane 12 is a part which accommodates a blade group, as high rigidity as the 1st ground plane 11 is not requested | required. However, it has been found that the operation of the blade group is improved by securing a wide (thickness) space for accommodating the blade group. Therefore, as shown in the cross-sectional view of FIG. 3, the second ground plane 12 is formed thinner than the first ground plane 11 so that the accommodation space of the blade group is widened. In addition, since the second ground plane 12 does not often need to be as rigid as the first ground plane 11, the second ground plane 12 may be formed of a material having rigidity lower than that of the first ground plane 11. For example, the second ground plane 12 is made of titanium or stainless steel. However, the second ground plane 12 may be formed of the same aluminum or carbon steel (SK) as the first ground plane 11. The material of the first ground plane 11 and the second ground plane 12 may be resin. Furthermore, one of the first ground plane 11 and the second ground plane 12 may be made of resin, and the other may be made of metal.

<Auxiliary ground plate>
An auxiliary ground plane (not shown) is attached to the ground plane 1 at a position facing the ground plane 1 at a predetermined interval. In the auxiliary ground plate, a rectangular opening similar to the opening 1 a formed in the ground plate 1 is formed. A space defined between the main plate 1 and the auxiliary base plate is a blade chamber in which the intermediate plate 3, the leading blade group 4, the trailing blade group 5, and the like are accommodated.

<Intermediate plate 3>
As described above, the intermediate plate 3 is accommodated in the blade chamber defined by the base plate 1 and the auxiliary base plate. The intermediate plate 3 is formed with a rectangular opening 3 a similar to the opening 1 a formed in the base plate 1. The intermediate plate 3 is disposed in order to distinguish the space in which the leading blade group 4 and the trailing blade group 5 are accommodated in the blade chamber. For example, the leading blade group 4 is disposed between the ground plate 1 and the intermediate plate 3, and the trailing blade group 5 is disposed between the auxiliary ground plate and the intermediate plate 3.

  An area where the openings formed in the base plate 1, the auxiliary base plate, and the intermediate plate 3 overlap is an exposure opening (image frame) that functions as an exposure opening in the focal plane shutter. On the opposite side of the exposure aperture from the subject, for example, a photoelectric conversion element such as a C-MOS or CCD is arranged as an imaging element (not shown). This photoelectric conversion element is an element having a function of converting light into an electrical signal by being irradiated with light after passing through the exposure aperture and the lens, and passing from the subject side. It is not limited. The exposure aperture (image frame) changes its open / close state by moving the front blade group 4 and the rear blade group 5 driven by the drive mechanism unit 8, and emits light from the subject side when the exposure aperture is open. Pass to the image sensor side. Incident light that has passed through the exposure aperture from the subject side reaches the image sensor disposed at the tip of the focal plane shutter, converts the light received by the image sensor into an electrical signal, and sends it to a control unit (not shown). By outputting, imaging is performed. Note that a film or the like may be disposed instead of the above-described imaging element, and these imaging element and film may be collectively referred to as an imaging unit in the present invention.

<Front blade group 4 and rear blade group 5>
The leading blade group 4 and the trailing blade group 5 are driven by the drive mechanism unit 8 and operate to open and close the exposure opening (image frame) defined by the openings 1a and 3a. The leading blade group 4 and the trailing blade group 5 are each composed of a plurality of strip-shaped blades (a rectangular shape or a substantially rectangular shape elongated in the longitudinal direction from the exposure opening), and are connected to the drive mechanism unit 8 via an arm. . In other words, the power generated by the drive mechanism unit 8 is transmitted to the leading blade group 4 and the trailing blade group 5 via the arm, whereby the leading blade group 4 and the trailing blade group 5 travel.

<Drive mechanism unit 8>
The drive mechanism unit 8 is disposed on the first ground plane 11 and is configured to operate the blade group by power using an electromagnet or a spring. When the user releases the imaging device such as a camera, the drive mechanism unit 8 operates, and the power is transmitted to the leading blade group 4 and the trailing blade group 5 via the arm. As a result, the leading blade group 4 and the trailing blade group 5 operate (run), and the image sensor is exposed.

  The focal plane shutter according to the present embodiment includes the ground plane 1 in which the first ground plane 11 on which the drive mechanism 8 is mounted and the second ground plane 12 in which the opening 1a is formed are connected as described above. It becomes easy to form the first ground plane 11 and the second ground plane 12 with different materials and thicknesses. Therefore, it is possible to form the first ground plane 11 on which the drive mechanism unit 8 is mounted using a material having higher rigidity than the second ground plane 12 and / or thicker than the second ground plane 12. On the other hand, the second ground plane 12 can be formed to have lower rigidity and / or thickness than the first ground plane 11. Thereby, it is possible to increase the rigidity of the portion on which the drive mechanism unit 8 is mounted, and to ensure a wide space for accommodating the blade group. Furthermore, by ensuring a large accommodation space for the blade group, it is possible to suppress generation of dust such as abrasion powder due to sliding between the blade group and the base plate 1, the auxiliary base plate, the intermediate plate 3, or the like. Become.

  Further, in the focal plane shutter of the present embodiment, since the second base plate 12 is formed thinner than the first base plate 11, the drive mechanism unit 8 is mounted while ensuring a relatively wide traveling space for the blade group. The rigidity of the first ground plane 11 can be increased.

  Further, in the focal plane shutter according to the present embodiment, it is possible to adopt a configuration in which a material having higher rigidity than the second ground plane 12 is used as the material of the first ground plane 11. Thereby, it is possible to increase the rigidity of the first ground plane 11 that requires high rigidity in order to mount the drive mechanism unit 8. In addition, since the second ground plane 12 can be formed of a material having a relatively low rigidity, the cost of the entire focal plane shutter can be reduced.

<Modification>
Moreover, in the modification of this embodiment, as FIG. 4 shows, the part which is easy to contact the blade group of the 2nd ground plate 12 is formed thinly as the thin formation area 12a. This thin formation region 12a is formed in a region corresponding to, for example, a connecting portion between the blade group and the arm and having a thickness by the connecting tool.

  As described above, in the configuration of the present modification, the portion of the second ground plane 12 corresponding to the sliding portion of the blade group that requires a particularly large space can be thinly formed as the thin formation region 12a.

<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, and is broadly interpreted to the extent that a person skilled in the art can grasp based on the same technical idea. is there.

  In the said embodiment, although the 1st ground plane 11 and the 2nd ground plane 12 gave and demonstrated the example from which both thickness and a raw material differ, the 1st ground plane 11 and the 2nd ground plane 12 are thickness and a raw material. You may form so that only one side may differ. Thus, even when the first ground plane 11 and the second ground plane 12 are formed so that only one of the thickness and the material is different, a certain effect can be obtained.

  Moreover, although the said embodiment demonstrated the example in which the rectangular-shaped opening part was each formed in the ground plane 1, the auxiliary ground plane (not shown), and the intermediate | middle board 3, these ground plane 1, auxiliary ground plane, and intermediate | middle The opening formed in the plate 3 is not limited to a rectangular shape or a substantially rectangular shape. That is, these openings may be formed in a square shape or a substantially square shape, or may have other shapes. Furthermore, the openings formed in the main plate 1, the auxiliary base plate, and the intermediate plate 3 may have different shapes.

  In the above embodiment, only the characteristic features of the present invention have been described. However, the focal plane shutter of the present invention further includes various configurations of the conventional focal plane shutter.

  The focal plane shutter of the present invention is used as a configuration of an imaging apparatus such as a camera having high durability.

DESCRIPTION OF SYMBOLS 1 ... Ground plate 1a ... Opening part 11 ... 1st ground plate 12 ... 2nd ground plate 12a ... Thin formation area 13 ... Connection part 13a, 13b, 14a, 14b ... Connection hole 13c, 14c ... Connection tool 3 ... Intermediate plate 3a ... Opening part 4 ... Leading blade group 5 ... Rear blade group 8 ... Drive mechanism section

Claims (7)

A ground plane having an opening for exposure;
An auxiliary base plate having an opening for exposure and arranged at a predetermined interval from the base plate;
A blade group disposed between the main plate and the auxiliary base plate;
A drive mechanism unit that drives the blade group disposed on the base plate,
The ground plate is formed by connecting a first ground plate on which the drive mechanism portion is mounted and a second ground plate in which the opening is formed.
Focal plane shutter. The second ground plane is formed thinner than the first ground plane,
The focal plane shutter according to claim 1. The second ground plane is formed with a thickness less than half that of the first ground plane.
The focal plane shutter according to claim 2. The first ground plane and the second ground plane are formed of different metals.
The focal plane shutter according to any one of claims 1 to 3. The second ground plane is partially thinly formed,
The focal plane shutter according to any one of claims 1 to 4. The first ground plane is formed of a material having higher rigidity than the second ground plane.
The focal plane shutter according to any one of claims 1 to 5.   An imaging device comprising the focal plane shutter according to claim 1.

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