JP2017167227A - Focal plane shutter and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focal plane shutter that can be constructed to a relatively compact size while suppressing the occurrence of ghost and flare in the result of imaging.SOLUTION: Provided is a focal plane shutter comprising a bottom board having an opening for exposure that is formed in shape of a rectangle or approximately a rectangle, a blade operating so as to switch the open/closed states of the opening, a tabular member arranged at a position facing the blade, a side of the tabular member that corresponds to one side of the opening having an almost linear upper and lower portions along the one side of the opening and a center portion more apart from the one side of the opening than is the upper and lower portions.SELECTED DRAWING: Figure 4

Description

  One embodiment of the present invention relates to a focal plane shutter or the like used for a camera or the like.

  The focal plane shutter, which exposes the image sensor or film by opening and closing the opening (image frame) of the base plate with the blade group, drives the blade group arranged in the blade chamber formed between the base plate and the auxiliary base plate. It is configured such that exposure is performed by changing the open / closed state of the opening by being driven by a mechanism. In such a focal plane shutter, a blade pressing plate is often arranged between the blade group and the main plate or the auxiliary base plate in order to suppress the flutter of the blade group. Further, in the focal plane shutter having a two-curtain configuration having two sets of blade groups, an intermediate plate is disposed between the front blade group and the rear blade group. Such a focal plane shutter may employ a configuration for preventing incidental light from being reflected at the end of the opening to prevent original color expression or ghost or flare from occurring. (See Patent Document 1).

JP 2011-141366 A

  In the conventional focal plane shutter described above, the opening of the blade retainer plate and the intermediate plate is made larger than the opening of the main plate as a countermeasure against the occurrence of ghost and flare caused by reflection of incident light at the end of the opening. There was sometimes a shape. However, if the opening of the blade retainer plate or the intermediate plate is enlarged, the blade retainer plate or the intermediate plate itself is enlarged, resulting in an increase in the size of the entire shutter, and consequently the entire camera.

  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 (1a) for exposure formed in a square shape or a substantially square shape;
Blades (5, 6) that operate to switch the open / closed state of the opening;
A plate-like member (blade retainer plate 4 or intermediate plate 3) arranged at a position facing the blade, and a side corresponding to one side of the opening of the plate-like member is the one side of the opening A substantially linear upper and lower portion (4a, 4b) along the center, and a central portion (c) spaced from the one side of the opening than the upper and lower portions,
It is a focal plane shutter.

  According to the focal plane shutter having the above configuration, since the central portion of the plate-like portion is separated from one side of the opening, it is possible to suppress the portion from reflecting incident light. As a result, it is possible to prevent the occurrence of ghosts and flares and to capture high quality images. In addition, since the upper and lower parts of the plate-like part have a linear shape along one side of the opening, the area for holding the blades and damage can be prevented while suppressing the enlargement of the plate-like part. It can be set as the structure which ensures sufficient area.

In the focal plane shutter, preferably,
An auxiliary base plate that is formed in a square shape or a substantially square shape and has an auxiliary opening portion that forms an opening for exposure together with the opening portion, and forms a blade chamber in which the blade is accommodated in a space between the base plate An auxiliary base plate that
The plate-like member is a blade pressing plate disposed in the blade chamber so as to hold the blade.

  According to the focal plane shutter having the above-described configuration, reflection of incident light by the blade pressing plate can be suppressed and generation of ghost and flare can be prevented.

In the focal plane shutter, preferably,
A central portion of the plate-like member has a wave shape.

  According to the focal plane shutter having the above configuration, the reflection of light by the central portion of the plate-like member can be irregularly reflected, thereby reducing the influence of the reflected unnecessary light on the captured image. it can. As a result, it is possible to improve the image quality of an image captured by an imaging device such as a camera having the focal plane shutter.

  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 configuration, it is possible to make the apparatus relatively small in size, and to prevent the image quality of the captured image from being deteriorated due to reflection of incident light by the opening of the blade pressing plate or the like. Become.

The top view of the focal plane shutter before blade | wing driving | running | working. The top view of the focal plane shutter after blade | wing driving | running | working. Enlarged view of the blade presser plate. The disassembled perspective view of a focal plane shutter.

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>
One feature of the focal plane shutter of this embodiment is that the center part of the side along the short side of the opening of the blade presser plate and / or the intermediate plate that holds the blade group is formed in a wavy shape. is there. Hereinafter, the focal plane shutter according to the present embodiment will be specifically described with reference to the drawings.

  FIG. 1 is a plan view of the focal plane shutter of the present embodiment before traveling on the blades. FIG. 2 is a plan view of the focal plane shutter of the present embodiment after traveling on the blades. That is, the state after the release for imaging is performed from the state of FIG. 1 and the leading blade group 5 and the trailing blade group 6 (described later) travel is the state of FIG. FIG. 3 is an enlarged view of the blade pressing plate of the present embodiment. FIG. 4 is an exploded perspective view of the focal plane shutter of the present embodiment. In the exploded perspective view shown in FIG. 4, the auxiliary base plate 2 is omitted.

  As shown in FIGS. 1, 2, and 4, the focal plane shutter of the present embodiment includes a base plate 1, an auxiliary base plate 2, an intermediate plate 3, a blade presser plate 4, a leading blade group 5, a trailing blade group 6, and The drive mechanism 7 is included. The leading blade group 5 and the trailing blade group 6 are respectively connected to the arms 5a and 5b and the arms 6a and 6b via a connecting shaft. The arms 5 a, 5 b, 6 a and 6 b are connected to the drive mechanism unit 7. In the present embodiment, a focal plane shutter having a two-curtain configuration including the leading blade group 5 and the trailing blade group 6 will be described as an example, but the characteristic configuration of the present embodiment is only one set of blade groups. The present invention is also applicable to a focal plane shutter having a single curtain configuration.

<Ground plate 1>
The base plate 1 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) (see FIGS. 1, 2, and 4). As shown in FIG. 1, the drive mechanism 7 is mounted on the ground plane 1. In the imaging apparatus equipped with the focal plane shutter of the present embodiment, an imaging element is arranged at the tip of the opening 1a (on the side opposite to the subject). However, the shape of the exposure opening may be, for example, a shape in which one side is substantially V-shaped, or a substantially rectangular shape in which corner portions are irregular. Further, the exposure opening may be square or substantially square. Note that rectangles and squares are sometimes collectively referred to as “squares”.

<Auxiliary ground plate 2>
The auxiliary base plate 2 is attached to the base plate 1 at a position facing the base plate 1 with a predetermined interval. The auxiliary base plate 2 is formed with a rectangular opening 2a similar to the opening 1a formed in the base plate 1 (see FIGS. 1 and 2). The space between the ground plane 1 and the auxiliary ground plane 2 is called a blade chamber in which members including the leading blade group 5 and the trailing blade group 6 are accommodated.

<Intermediate plate 3>
The intermediate plate 3 is disposed in the blade chamber between the ground plate 1 and the auxiliary ground plate 2 (see FIG. 4). As shown in FIG. 4, a leading blade group 5 is disposed between the main plate 1 and the intermediate plate 3, and between the auxiliary ground plate 2 and the intermediate plate 3, the blade presser plate 4 and the rear blade group 6. Is placed. In the intermediate plate 3, an opening 3 d is formed so as to overlap the opening 1 a of the base plate 1 and the opening 2 a of the auxiliary base plate 2. A part of a side (a right side in FIGS. 1, 2, and 4) that is a short side among the sides that form the opening 3 d is formed in a wavy shape. That is, one short side of the intermediate plate 3 has a substantially linear shape along the opening 1a (or 2a) of the ground plate 1 (or auxiliary ground plate 2) in the upper and lower portions in contact with the long side. In the central portion ahead of the substantially straight line shape, a wave shape (wave shape) is formed that is slightly separated from the opening 1a (or 2a) of the ground plate (or auxiliary ground plate 2).

<Vane presser plate 4>
The blade presser plate 4 is a blade chamber between the ground plate 1 and the auxiliary ground plate 2, and is disposed between the intermediate plate 3 and the rear blade group 6 (see FIG. 4). In particular, as shown in FIG. 3, the blade presser plate 4 has a U-shaped shape that covers the vicinity of the end of the rear blade group 6 opposite to the end to which the arms 6a and 6b are connected. ing. The inner side of the blade presser plate 4 is formed in a shape along one short side of the opening 1a of the base plate 1 and the opening 2a of the auxiliary base plate 2, but in this embodiment, in particular, this blade presser It is characterized by one side inside the plate 4. That is, one side corresponding to the openings 1a and 2a of the blade pressing plate 4 has an opening 1a (or 2a) of the base plate 1 (or auxiliary base plate 2) at the upper and lower portions contacting the long sides of the openings 1a and 2a. Is formed in a wavy shape (wave shape) slightly spaced from the opening 1a (or 2a) of the main plate (or auxiliary base plate 2) in the central portion ahead of the substantially straight shape. ing. That is, one side corresponding to the openings 1 a and 2 a of the blade pressing plate 4 has a similar shape to one side corresponding to the intermediate plate 3. The blade presser plate 4 functions to reduce shaking during operation of the rear blade group 6.

<Lead feather group 5>
The leading blade group 5 is disposed between the ground plate 1 and the intermediate plate 3 in the blade chamber defined by the ground plate 1 and the auxiliary ground plate 2. The leading blade group 5 is driven by the drive mechanism unit 7 and operates to open and close the exposure opening (image frame) defined by the openings 1a and 2a. The leading blade group 5 is composed of a plurality of blades, and is connected to the drive mechanism unit 7 via the arms 5a and 5b.

<Rear blade group 6>
The rear blade group 6 is disposed between the blade pressing plate 4 and the auxiliary ground plate 2 in the blade chamber defined by the ground plate 1 and the auxiliary ground plate 2. The rear blade group 6 is driven by the drive mechanism unit 7 and operates to open and close the exposure opening (image frame) defined by the openings 1a and 2a. The rear blade group 6 is composed of a plurality of blades, and is connected to the drive mechanism section 7 via the arms 6a and 6b.

<Drive mechanism unit 7>
The drive mechanism unit 7 is mounted on the ground plane 1 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 7 operates, and the power is transmitted to the leading blade group 5 and the trailing blade group 6 via the arms 5a, 5b, 6a and 6b. As a result, the leading blade group 5 and the trailing blade group 6 operate to open and close the exposure opening (image frame), and the image sensor is exposed (irradiated with incident light).

  As described above, in the focal plane shutter of the present embodiment, the central portion of one side corresponding to the short side of the opening 1a (and 2a) of the intermediate plate 3 and the blade presser plate 4 is the opening 1a (and 2a). Since it is spaced apart from the short side, the central portion can be prevented from reflecting incident light. As a result, it is possible to prevent the occurrence of ghosts and flares and to capture high quality images. In addition, since the upper and lower portions of the one side of the intermediate plate 3 and the blade presser plate 4 are linear along the corresponding short side of the opening 1a (and 2a), the intermediate plate 3 and the blade presser plate 4 It can be set as the structure which secures the area for pressing down the front blade group 5 and the rear blade group 6, and an area sufficient to prevent a failure | damage, suppressing enlargement.

  Moreover, according to the focal plane shutter of this embodiment, since the central part of the said one side of the intermediate | middle board 3 and the blade presser board 4 is made into a wavy shape, reflection of the incident light by the said central part can be made into irregular reflection. Thus, it is possible to reduce the influence of the reflected unnecessary light on the captured image. As a result, it is possible to improve the image quality of an image captured by an imaging device such as a camera having the focal plane shutter.

<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 both the intermediate | middle board 3 and the blade pressing board 4 demonstrated the structure which has a linear shape part and a corrugated shape part in the one side corresponding to the short side of the opening parts 1a and 2a, the intermediate | middle board 3 Even if either of the blade pressing plate 4 and the blade pressing plate 4 has such a characteristic, a certain effect can be obtained. Moreover, the structure which is not necessarily provided with the intermediate | middle board 3 and the blade presser board 4 may be employ | adopted, and the structure further provided with structures other than these structures may be employ | adopted.

  In the above embodiment, the so-called two-screen focal plane shutter including the leading blade group 5 and the trailing blade group 6 has been described as an example. However, the so-called single-screen focal plane shutter including only one blade group is described. It is also applicable to. In this case, since the intermediate plate 3 has an unnecessary configuration, a configuration in which one side of the blade pressing plate 4 includes a linear shape portion and a corrugated shape portion is employed.

  In another embodiment, the blade pressing plate 4 may be provided between the intermediate plate 3 and the leading blade group 5. Furthermore, in other embodiments, the blade pressing plate 4 may be provided between the intermediate plate 3 and the leading blade group 5 and between the intermediate plate 3 and the leading blade group 5.

  In the above-described embodiment, the description has been made on the assumption that an image sensor such as a CCD or a C-MOS is used. However, the focal plane shutter of the above-described embodiment can also be applied to an image pickup apparatus using a film. It is.

  The focal plane shutter of the present invention is used as a shutter device for an image pickup apparatus that suppresses the occurrence of ghosts and flares.

DESCRIPTION OF SYMBOLS 1 ... Base plate 2 ... Auxiliary base plate 3 ... Intermediate | middle plate 1a, 2a, 3d ... Opening part 4 ... Blade | wing presser plate 5 ... Lead blade group 6 ... Rear blade group 5a, 6a ... Arm 7 ... Drive mechanism part

Claims (4)

A ground plane having an opening for exposure formed in a square or substantially square shape;
A blade that operates to switch the open / closed state of the opening;
A plate-like member disposed at a position facing the blade, and a side corresponding to one side of the opening of the plate-like member is a substantially linear upper and lower portion along the one side of the opening, A central portion spaced from the one side of the opening rather than the upper and lower portions;
Focal plane shutter. An auxiliary base plate that is formed in a square shape or a substantially square shape and has an auxiliary opening portion that forms an opening for exposure together with the opening portion, and forms a blade chamber in which the blade is accommodated in a space between the base plate An auxiliary base plate that
The plate-like member is a blade presser plate arranged in the blade chamber so as to hold the blade.
The focal plane shutter according to claim 1. The central part of the plate-like member has a wavy shape,
The focal plane shutter according to claim 1 or 2.   An imaging device comprising the focal plane shutter according to claim 1.

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