JP2003195393A - Optical system barrier device and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately positively protect an optical system and a lens barrel to achieve a simple constitution and the miniaturization of the lens barrel without inviting an increase in a dimension in the optical axis direction and constitution complication caused by an increase of the number of barrier blades. <P>SOLUTION: Sheet members 7a and 7b consisting of a material having flexibility cover a gap between the opening edge of a barrier cover 8 and barrier blades 2a and 2b when the barrier blades 2a and 2b are in a closed state to completely shield the opening portion as well as the barrier blades 2a and 2b covering part of the inside diameter of the barrier cover 8. The sheet member 7a is coupled to the sheet member 7b so that the edges of their one ends may not leak light to the outside edges of the barrier blade 2a and 2b. The edges of their other ends are fixed to the barrier cover 8. The barrier blades 2a and 2b as well as the sheet members 7a and 7b are refuged to an area free of the opening of the barrier cover 8 in a barrier open state to house the barrier blades 2a and 2b as well as the sheet members 7a and 7b in a barrier blade housing located at outside the opening of the barrier cover 8. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system barrier mechanism that protects an objective surface of an optical system in an optical device such as a camera from opening and closing, and protects the optical system from dust or stains by fingers. The present invention relates to an optical system barrier device and a camera suitable for a camera or the like provided with a movable lens barrel by driving.

[0002]

2. Description of the Related Art As an optical system barrier device for protecting an optical system from opening or closing an objective surface of an optical system in an optical device such as a camera having a movable lens barrel driven by a motor, and protecting the optical system from dust or stains by fingers. Conventionally, various types of devices have been proposed. In the conventional optical system barrier device of this type, the number of barrier blades is almost determined by the effective optical path range of the optical system and the diameter of the lens barrel in order to enable the opening / closing operation of the barrier. That is, as the effective optical path range corresponding to the effective diameter of the optical system becomes wider, the opening area to be opened and closed correspondingly becomes wider. In order to retract the barrier blades in this state, it was necessary to purposely widen the diameter of the lens barrel. In reality, since the diameter of the lens barrel is limited, it has been common to deal with the problem by increasing the number of barrier blades instead of increasing the size of each barrier blade. However, in this case, as the number of barrier blades increases, the thickness of the barrier mechanism in the direction along the optical axis increases. Moreover, recently, in order to meet the needs of users, a wide-angle taking optical system having a wide effective optical path range of the optical system is required, and the thickness in the optical axis direction tends to increase with the increase of the barrier blades described above.

Therefore, in order to further reduce the size of the camera, the barrier that opens and closes is eliminated so that the lens is protected by a separate lens cap, or the objective surface of the optical system is protected by hard glass. Methods are also being taken. As another technique, Japanese Patent Laid-Open No. 7-
No. 225409 and Japanese Patent Laid-Open No. 2000-098451.
The technique disclosed in the publication is proposed. In Japanese Patent Laid-Open No. 7-225409 described above, the barrier blade is interlocked with the opening / closing operation on the basis of the position of the lens surface closest to the object, for example, the plane position orthogonal to the optical axis of the objective lens and in contact with the convex surface, in the optical axis By moving the barrier blades and the like in the closed state to the front of the plane position and the barrier blades and the like to the rear of the plane position in the open state. A barrier mechanism that secures a wide effective optical path range of an optical system is disclosed. Further, the above-mentioned Japanese Patent Laid-Open No. 2000-098451 discloses a lens barrier mechanism in which the barrier blade is made smaller than the area of the front surface of the lens barrel to cover only the optical system portion to achieve compactness. There is.

[0004]

However, the technique disclosed in Japanese Patent Application Laid-Open No. 7-225409 has a problem that the mechanism of the barrier device is complicated and an operational defect is likely to occur. In the technique disclosed in Japanese Patent Application Publication No. 2000-098451, the optical system itself is protected by the barrier, but there is no sufficient description regarding storage or protection of the mechanical portion itself of the barrier device, and the mechanical portion itself of the barrier device. There is a possibility that the structure may be further complicated or large due to storage or protection of the. If the mechanical portion itself of the barrier device is exposed, operational problems are likely to occur. As described above, when an optical system barrier device used for a lens barrel of an optical system having a large effective optical path diameter such as a wide-angle optical lens barrel is constructed by using the conventional technique of increasing the number of blades, The thickness of the system barrier device in the optical axis direction increases, and the distance from the lens front surface closest to the objective to the barrier cover front surface increases. Therefore, the effective optical path range based on the effective optical path diameter further expands, and it becomes more and more difficult to secure a retreat space for the blades.
In addition, there is a technique to secure a retracting space for the barrier blades by increasing the lens barrel diameter without increasing the number of barrier blades, but it does not meet the needs for miniaturization.

The present invention has been made in view of the above-mentioned circumstances, and an optical system and a lens barrel are appropriately and appropriately arranged without increasing the dimension in the optical axis direction and complicating the configuration due to the increase in the number of barrier blades. It is an object of the present invention to provide an optical system barrier device and a camera that are reliably protected, have a simple structure, are less likely to cause operational problems, and allow a lens barrel to be downsized. That is, an object of claim 1 of the present invention is to provide an optical system barrier device which can reduce the number of barrier blades and the manufacturing cost in addition to the above objects. Further, an object of claim 2 of the present invention is to provide an optical system barrier device having a particularly simple structure. It is an object of claim 3 of the present invention to provide an optical system barrier device which can be configured to have a small lens barrel diameter even when the effective optical path diameter of the optical system is large. An object of claim 4 of the present invention is to provide an optical system barrier device having a simple structure and a reliable operation.

An object of claim 5 of the present invention is to provide an optical system barrier device having a simpler construction. An object of claim 6 of the present invention is to appropriately and surely protect the optical system and the lens barrel without increasing the size in the optical axis direction and complicating the configuration due to the increase in the number of barrier blades. It is an object of the present invention to provide a camera in which the number of barrier blades in a system barrier device is small, the configuration is simple, and the manufacturing cost can be reduced.

[0007]

In order to achieve the above-mentioned object, an optical system barrier device according to the present invention is installed on the front side of an optical system of an optical apparatus, and the optical system barrier apparatus of the optical apparatus is provided. A barrier device that shuts off the effective optical path of the optical system when the optical device is inactive, and opens the effective optical path when the optical device is operating, which is smaller than the effective optical path range of the optical system. It has a light-shielding area, is inserted into the effective optical path of the optical system when the optical device is not operating, covers a part of the effective optical path and closes the barrier, and retracts outside the effective optical path when the optical device is operating. And a barrier blade for opening the barrier to open the barrier blade and covering the rest of the effective optical path that is not covered with the barrier blade in the barrier closed state. Both are characterized by comprising a sheet-like member for shielding the effective optical path.

Further, in the optical system barrier device according to a second aspect of the present invention, the sheet-like member has one end at an outer edge portion of the barrier blade located outside the effective optical path in the barrier open state. The edges are joined in a light-tight manner, and the other edge is joined to the member forming the inner surface of the barrier blade chamber that accommodates the barrier blade in the barrier open state, and in the barrier closed state, the barrier blade and It is characterized in that the member is stretched with a predetermined tension between it and the member forming the inner surface of the barrier blade chamber. In the optical system barrier device according to a third aspect of the present invention, the sheet-like member is deformed during the barrier opening operation while corresponding to the peripheral shape and without interfering with the operation mechanism for the barrier opening / closing operation. It is characterized in that it is housed in the barrier blade chamber together with the barrier blade. In the optical system barrier device according to a fourth aspect of the present invention, the sheet-shaped member is formed by giving an elastic restoring force to a bent state, and the barrier blade chamber is formed by the elastic restoring force during a barrier opening operation. It is characterized in that it includes a bending deformation member that is bent and stored.

In the optical barrier device according to a fifth aspect of the present invention, the sheet-shaped member has elastic elasticity.
It is characterized by including an elastic deformation member which is contracted and housed in the barrier blade chamber due to the elastic elasticity when the barrier is opened. In order to achieve the above-mentioned object, a camera according to a sixth aspect of the present invention is provided with a camera body having a photographing optical system and a front side of the photographing optical system, and the camera body does not operate. A barrier device which is sometimes in a barrier closed state to shield the effective optical path of the photographing optical system, and which is in a barrier opened state to open the effective optical path when the camera is in operation, and the barrier device is effective in the photographing optical system. Has an effective light blocking area smaller than the optical path range,
A barrier that is inserted into the effective optical path of the photographing optical system when the camera is not operating to cover a part of the effective optical path and is in a barrier closed state. When the camera is operating, the barrier is retracted outside the effective optical path and is in a barrier open state. A blade and a sheet-like member made of a flexible and light-shielding material, which covers the rest of the effective optical path not covered by the barrier blade in the closed state of the barrier and shields the effective optical path together with the barrier blade. It is characterized by having.

[0010]

That is, the optical system barrier device according to claim 1 of the present invention is installed on the front side of the optical system of the optical device, and when the optical device is not operated, the barrier is closed to block the effective optical path of the optical system. A barrier device that opens the effective optical path when the optical device is in an open state when the optical device is in operation, the barrier device having a barrier blade and a sheet-like member, and the barrier blade is smaller than the effective optical path range of the optical system. It has an effective light-shielding area, is inserted into the effective optical path of the optical system when the optical device is not operating, covers a part of the effective optical path and closes the barrier, and retracts outside the effective optical path when the optical device is operating. The barrier-open state, the sheet-like member is made of a flexible and light-shielding material, and the remaining portion of the effective optical path that is not covered by the barrier blade in the barrier closed state. Covering for shielding the effective optical path with the barrier vane. With such a configuration, the optical system and the lens barrel are properly and surely protected without increasing the dimension in the optical axis direction and complicating the configuration due to the increase in the number of barrier blades, and the configuration is simple and the operation is easy. Problems are less likely to occur,
Although the lens barrel can be downsized, in particular, the number of barrier blades is small and the manufacturing cost can be reduced.

Further, in the optical system barrier device according to a second aspect of the present invention, one edge of the sheet-shaped member is light-tight to the outer edge of the barrier blade located outside the effective optical path in the barrier open state. And the other end edge of the sheet-shaped member is connected to a member forming the inner surface of the barrier blade chamber that accommodates the barrier blade in the barrier open state, and in the barrier closed state, the sheet-shaped member. Is stretched with a predetermined tension between the barrier blade and the member forming the inner surface of the barrier blade chamber. With such a configuration, the configuration can be particularly simplified. According to a third aspect of the present invention, in the optical system barrier device, the sheet-like member is deformed during the barrier opening operation without being interfered with by the operating mechanism corresponding to the peripheral shape and the barrier opening / closing operation.
The barrier blade chamber is housed together with the barrier blade.
With such a configuration, in particular, even if the effective optical path diameter of the optical system is large, the lens barrel diameter can be made small. In the optical system barrier device according to claim 4 of the present invention, the sheet-like member is formed by imparting an elastic restoring force to a bent state, and is bent and accommodated in the barrier blade chamber by the elastic restoring force when the barrier is opened. Including a bending deformation member. With such a configuration, the operation becomes more reliable with a particularly simple configuration.

In the optical barrier device according to a fifth aspect of the present invention, the sheet-shaped member has elastic stretchability, and the elastic deformable member is contracted and stored in the barrier blade chamber by the elastic stretchability when the barrier is opened. including. With such a configuration, the configuration can be further particularly simplified. According to a sixth aspect of the present invention, in a camera front side of a photographing optical system of the camera body, when the camera body is inoperative, a barrier is closed to block an effective optical path of the photographing optical system, and when the camera is activated, the barrier is opened. A barrier device for opening the effective optical path is installed as a state, and the barrier device includes a barrier blade and a sheet-like member, and the barrier blade has an effective light blocking smaller than an effective optical path range of the photographing optical system. When the camera is not in operation, it is inserted into the effective optical path of the photographing optical system to cover a part of the effective optical path and closes the barrier, and when the camera is in operation, the barrier is retracted outside the effective optical path. In the open state, the sheet-like member is made of a material having flexibility and light-shielding property, and covers the rest of the effective optical path that is not covered by the barrier blades in the barrier closed state. Shielding the effective optical path with the barrier blades.

With such a structure, the optical system and the lens barrel are protected appropriately and surely without increasing the size in the optical axis direction and complicating the structure due to the increase in the number of barrier blades in the optical system barrier device. The structure is simple and the problem of operation is unlikely to occur, and the lens barrel can be downsized, but in particular, the number of barrier blades is small and the manufacturing cost can be reduced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The optical system barrier device and camera of the present invention will now be described in detail with reference to the drawings based on the embodiments of the present invention. 1 to 3 show a configuration of a main part of an optical system barrier device according to an embodiment of the present invention. FIG. 1 is a front view schematically showing the configuration of the optical system barrier device viewed from the object side, that is, the subject side, and FIG.
FIG. 3 is an exploded perspective view schematically showing the configuration of the optical system barrier device of FIG. 1 as viewed from the front obliquely upward direction, and FIG. 3 is a schematic perspective view of the configuration of the optical system barrier device of FIG. FIG. 4 to 7 are partial detailed views of the optical system barrier device, FIG. 4 is a sectional view taken along the line AA of FIG. 1 in the barrier closed state, and FIG. 5 is a barrier in the barrier closed state. A view of the blade part from the back side,
6 is a cross-sectional view of the cross section taken along the line AA of FIG. 1 in the barrier open state, and FIG. 7 is a schematic view showing in detail the configuration of the lever portion of the optical system barrier device of FIG.

Although the configurations shown in FIGS. 1 to 7 are described by taking an optical system barrier device used in a digital camera as an example in this case, optical devices such as a single lens reflex camera, a lens shutter camera and a video camera. Can be applied to, and the application can be performed in almost the same manner. The optical system barrier device shown in FIGS. 1 to 4 includes an optical system 1, a first barrier blade 2a, a second barrier blade 2b, a ring lever 3, a small lever 4, a return spring 5, and a first transition spring 6a. Second transition spring 6b, first
The sheet-shaped member 7a, the second sheet-shaped member 7b, the barrier cover 8, the lens barrel Y, and the barrier base Z are provided. The optical system barrier device according to the present embodiment allows the barrier blades 2a and 2b to enter the effective optical path region of the optical system 1 with respect to the optical system 1 such as a photographing optical system so as to make the effective optical path of the optical system 1 a barrier blade. By blocking with 2a and 2b, the barrier is closed as shown in FIGS. 1, 2, 4 and 5. In addition, as shown in FIG.
From the effective optical path region of the first and second barrier blades 2a, 2b
The barrier is opened by evacuating.

That is, in this optical system barrier device, the first barrier blade 2a and the second barrier blade 2b are provided.
Form a pair, enter the effective optical path region B of the optical system 1 when the barrier is closed, and retract from the effective optical path region B when the barrier is open. The ring lever 3 includes barrier blades 2a and 2
It is used to shift b to the open state. Small lever 4
Operates the ring lever 3 using the operating force when the lens barrel Y (a part of which is shown in FIGS. 4 and 6) moves to the stored state. The return spring 5 is provided with a small lever 4 when the lens barrel Y shifts from the housed state to the photographing state.
When the operating force is released from, the ring lever 3 is returned to the open state. First and second transition spring 6
When the ring lever 3 returns to the open state, a and 6b urge the barrier blades 2a and 2b to shift to the open state. First and second sheet-shaped members 7a and 7
b is made of a flexible material, and when the first and second barrier blades 2a and 2b are closed,
The gap between the opening of the barrier cover 8 and the barrier blades 2a and 2b is shielded.

The structure and operation of the above optical barrier device will be described in more detail with reference to the exploded perspective views shown in FIGS. 2 and 3 and the partial detailed views shown in FIGS. 5 and 7. First, the relationship between the ring lever 3 and the small lever 4 will be described. Since the lens barrel Y retracts backward together with the optical system barrier device during storage, a convex portion (not clearly shown) provided on the lens barrel substrate of the stationary system causes an arrow in FIG. A force in the direction of arrow D acts on the portion indicated by D. When a force indicated by arrow D is applied to the small lever 4, the force indicated by arrow E in FIG. 3 is generated by the rotation around the illustrated rotation center 4c. Since the portion of the small lever 4 on which the force of the arrow E acts is located at the position corresponding to the portion of the ring lever 3 corresponding to the arrow F shown in FIG. 3, the ring lever 3 moves in the direction of the arrow F of FIG. The power of is added. Since the rotation center 3c of the ring lever 3 is rotatably engaged with the C portion of the barrier base Z, when the ring lever 3 is slightly rotated by the force in the F direction, the cam portions H and G of the ring lever 3 regulate the rotation. The engaging bosses Bb and Ba of the barrier blades 2a and 2b, which have been set, are in a freely movable state, and the first and second transition springs 6a are formed.
And 6b close the barrier blades 2a and 2b.

When not stored, that is, when the force of the small lever 4 on the arrow D is no longer applied, the ring lever 3 is urged by the return spring 5 in the direction opposite to the arrow F, and the cam portion H and The opening of the barrier blades 2a and 2b is controlled by the regulation of G, and the barrier blades 2a and 2b are driven in the opening direction. The return spring 5 is engaged with the barrier base Z at the position shown by the broken line in FIG. Next, the engagement state of the first and second transition springs 6a and 6b is shown in FIG. In FIG. 5, the engaging portions Za and Zb formed on the barrier base Z are shown.
The engaging portions Za and Zb and the barrier blades 2a and 2b
And the first and second transition springs 6a and 6b
Are engaged with each other. Return spring 5 described above
Is shown in detail in FIG. As shown in FIG. 7, the return spring 5 is engaged with the ring lever 3 and the engaging portion Zc formed on the barrier base Z.

With the above-mentioned structure, in the closed state of the barrier, as shown in FIG. 1, the sheet-like members 7a and 7b made of a highly flexible material are the barrier blades 2
Together with a and 2b, the opening of the barrier cover 8 is completely shielded. The sheet-shaped members 7a and 7b are light-tightly coupled so that one edge thereof does not leak to the outer edges of the barrier blades 2a and 2b, and the other edge thereof is the barrier cover 8, the lens barrel Y or the barrier base. It is fixed to Z etc. These sheet-like members 7a and 7b are stretched with some tension in the barrier closed state. Further, in the barrier open state, the sheet-shaped members 7a and 7b are
Are retracted to the outside of the opening of the barrier cover 8 together with the barrier blades 2a and 2b, and are folded inside the space formed outside the opening of the barrier cover 8, that is, the inside of the barrier blade chamber, as shown in FIG. It is bent and stored. The sheet-like members 7a and 7b are bent and housed in the barrier blade chamber in the barrier open state.
This is to prevent the sheet-shaped members 7a and 7b from interfering with the effective optical path and each operating component during the opening / closing operation of b.

Therefore, when the barrier is opened and closed, the sheet-shaped members 7a and 7b are formed so as to have an appropriate elastic restoring force so that the sheet-shaped members 7a and 7b are appropriately bent at appropriate places. Alternatively, the sheet-shaped members 7a and 7b may be formed to have elastic stretchability,
The sheet-shaped members 7a and 7b may be extended in the barrier closed state as long as the light-shielding property is not impeded, and the sheet-shaped members 7a and 7b may be elastically contracted in the barrier opened state to fit in the barrier blade chamber. Further, the above-mentioned optical system barrier device may be incorporated into, for example, a digital camera to form a digital camera with an optical system barrier device. By applying the same configuration, a single lens reflex camera with an optical system barrier device, an optical system It can be applied to optical devices such as a lens shutter camera and a video camera with a barrier device, and can be applied and implemented in almost the same manner. Further, the present invention can be applied to barrier devices for future ultra-wide-angle optical systems.

[0021]

As described above, according to the present invention, the optical system and the lens barrel can be properly and reliably provided without increasing the dimension in the optical axis direction and complicating the configuration due to the increase in the number of barrier blades. It is possible to provide an optical system barrier device and a camera that are protected from the above, have a simple structure, are less likely to cause operational problems, and can be downsized. That is, according to the optical system barrier device of claim 1 of the present invention, the optical system is installed on the front side of the optical system of the optical device, and when the optical device is not operated, the barrier is closed to shield the effective optical path of the optical system. A barrier device that opens the effective optical path when the optical device is in an open state when the optical device is in operation is configured to include a barrier blade and a sheet-shaped member, and the barrier blade has an effective smaller than an effective optical path range of the optical system. It has a light-shielding area, is inserted into the effective optical path of the optical system when the optical device is not operating, covers a part of the effective optical path and closes the barrier, and retracts outside the effective optical path when the optical device is operating. The barrier-open state, the sheet-like member is made of a flexible and light-shielding material, and covers the rest of the effective optical path that is not covered by the barrier blades when the barrier is closed. By blocking the effective light path together with the barrier blade, the optical system and the lens barrel are properly and surely protected without increasing the dimension in the optical axis direction and complicating the configuration due to the increase in the number of barrier blades. Although the configuration is simple and problems in operation are unlikely to occur, it also enables downsizing of the lens barrel, but in particular,
The number of barrier blades is small and the manufacturing cost can be reduced.

Further, according to the optical system barrier device of the second aspect of the present invention, one edge of the sheet-shaped member is exposed to the outer edge of the barrier blade located outside the effective optical path in the barrier open state. The sheet-like member is tightly coupled, and the other end edge of the sheet-shaped member is coupled to a member that forms an inner surface of a barrier blade chamber that accommodates the barrier blade in the barrier open state, and the sheet is in the barrier closed state. The configuration can be particularly simplified by adopting a configuration in which the strip-shaped member is stretched with a predetermined tension between the barrier blade and the member forming the inner surface of the barrier blade chamber. According to the optical system barrier device of the third aspect of the present invention, the sheet-like member is deformed without interfering with the operating mechanism associated with the peripheral shape and the barrier opening / closing operation during the barrier opening operation,
With the configuration in which the barrier blade chamber is housed together with the barrier blade, it is possible to reduce the lens barrel diameter especially when the effective optical path diameter of the optical system is large.

According to the optical system barrier device of the fourth aspect of the present invention, the sheet-like member is formed by giving an elastic restoring force to the bent state, and the barrier blade is caused by the elastic restoring force during the barrier opening operation. By including the bending and deforming member that is bent and housed in the chamber, the operation is further ensured with a particularly simple structure. According to the optical system barrier device of the fifth aspect of the present invention, the sheet-shaped member has elastic expansion and contraction, and the elastic deformation member is contracted and stored in the barrier blade chamber due to the elastic expansion and contraction during the barrier opening operation. In particular, the inclusion can further simplify the configuration. According to the camera of claim 6 of the present invention, the effective optical path of the photographing optical system is blocked on the front side of the photographing optical system of the camera body by closing the barrier when the camera body is inactive. A barrier device that opens the effective optical path in a barrier open state during operation is installed, and the barrier device includes a barrier blade and a sheet-shaped member, and the barrier blade is located within an effective optical path range of the photographing optical system. Has a small effective light-shielding area, is inserted into the effective optical path of the photographing optical system when the camera is not operating, covers a part of the effective optical path and closes the barrier, and is outside the effective optical path when the camera is operating. The sheet-shaped member is made of a flexible and light-shielding material when retracted to a barrier open state, and the remaining portion of the effective optical path that is not covered by the barrier blade in the barrier closed state. By covering and blocking the effective optical path together with the barrier blade, the optical system and the lens barrel can be appropriately arranged without increasing the size in the optical axis direction and complicating the configuration due to the increase in the number of barrier blades in the optical system barrier device. In addition, reliable protection, simple structure, less problem in operation, and downsizing of the lens barrel are possible. In particular, the number of barrier blades is small and the manufacturing cost can be reduced. it can.

[Brief description of drawings]

FIG. 1 is a front view schematically showing a configuration of an optical system barrier device according to an embodiment of the present invention in a barrier closed state viewed from an object side, that is, a subject side.

FIG. 2 is an exploded perspective view schematically showing the configuration of the optical system barrier device of FIG. 1 as viewed from diagonally above the front.

FIG. 3 is an exploded perspective view schematically showing the configuration of the optical system barrier device of FIG. 1 as viewed from diagonally above the back surface.

FIG. 4 is a cross-sectional view showing the direction of arrow AA in the barrier closed state of the optical system barrier device of FIG.

5 is a plan view showing a state in which the barrier blade portion in the barrier closed state of the optical system barrier device of FIG. 1 is viewed from the back side.

6 is a cross-sectional view showing a cross section taken along line AA in the barrier open state of the optical system barrier device of FIG.

7 is a front view showing a ring lever portion of the optical barrier device of FIG. 1. FIG.

[Explanation of symbols]

1 Optical system 2a, 2b Barrier blade 3 ring lever 4 small lever 5 Return spring 6a, 6b First and second transition springs 7a, 7b sheet-like member 8 barrier covers Y lens barrel Z barrier base

Claims (6)

[Claims] 1. Installed on the front side of an optical system of an optical device,
In a barrier device that shuts off the effective optical path of the optical system when the optical device is not operating and is in the barrier closed state and opens the effective optical path when the optical device is operating, in a barrier open state, the effective optical path range of the optical system is Having a small effective light-shielding area, when the optical device is not operating, it is inserted into the effective optical path of the optical system to cover a part of the effective optical path and closes the barrier, and when the optical device is operating, is outside the effective optical path. A barrier blade that retreats into a barrier open state and a material that has flexibility and light blocking properties, and covers the rest of the effective optical path that is not covered by the barrier blade in the barrier closed state, together with the barrier blade An optical system barrier device, comprising: a sheet-shaped member that blocks an optical path. 2. The sheet-shaped member is light-tightly coupled at one end edge thereof to an outer edge portion of the barrier blade located outside the effective optical path in the barrier open state, and the barrier in the barrier open state. The other edge is coupled to the member forming the inner surface of the barrier blade chamber that accommodates the blade, and in the barrier closed state, a predetermined distance is provided between the barrier blade and the member forming the inner surface of the barrier blade chamber. The optical system barrier device according to claim 1, wherein the optical system barrier device is a member stretched with tension. 3. The sheet-shaped member is accommodated in the barrier blade chamber together with the barrier blade during the barrier opening operation, corresponding to the peripheral shape and deformed without interfering with an operation mechanism related to the barrier opening / closing operation. The optical system barrier device according to claim 2, wherein: 4. The sheet-shaped member includes a bending deformation member which is formed by applying an elastic restoring force to a bent state and which is bent and housed in the barrier blade chamber by the elastic restoring force when the barrier is opened. The optical system barrier device according to claim 3, which is characterized in that. 5. The sheet member according to claim 3, wherein the sheet member includes an elastic deformable member that is elastically expandable and contracts and is housed in the barrier blade chamber by the elastic expandability when the barrier is opened. The optical system barrier device described. 6. A camera body having an image-taking optical system, and a camera main body which is installed on the front side of the image-taking optical system and closes the effective optical path of the image-taking optical system by closing the barrier when the camera body is inoperative. A camera including a barrier device that opens the effective optical path when the barrier is opened during operation, wherein the barrier device has an effective light blocking area smaller than an effective optical path range of the photographing optical system, A barrier blade which is inserted into the effective optical path of the photographing optical system to cover a part of the effective optical path to be in a barrier closed state during operation, and which is retracted outside the effective optical path to be in a barrier open state during operation of the camera; It is made of a material having flexibility and a light blocking property, and covers the remaining part of the effective optical path that is not covered by the barrier blade in the closed state of the barrier to form the effective optical path together with the barrier blade. A camera, comprising: a sheet-like member that shields.