JP4001322B2 - Optical system barrier device and optical apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical system barrier mechanism that protects the objective surface of an optical system in an optical apparatus such as a camera from being opened and closed, and protects the optical system from dust or dirt caused by fingers, and in particular, includes a motor-driven movable lens barrel, for example. The present invention relates to an optical system barrier device and an optical apparatus suitable for a camera or the like.
[0002]
[Prior art]
Various types of optical barrier devices that protect the optical system from dust or finger contamination by opening and closing the objective surface of an optical system in an optical instrument such as a camera equipped with a motor-driven moving barrel. A device has been proposed.
In this type of conventional optical barrier device, 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 and closing operation of the barrier. That is, when the effective optical path range corresponding to the effective diameter of the optical system is widened, the opening area to be opened / closed is correspondingly increased. In order to retract the barrier blade in a state, it was necessary to bother the diameter of the lens barrel. In reality, since there is a limit to the diameter of the lens barrel, instead of increasing the size of individual barrier blades, it has been common to increase the number of barrier blades. However, in this case, the thickness in the direction along the optical axis of the barrier mechanism increases as the number of barrier blades increases.
Moreover, recently, in order to meet the needs of users, a wide-angle imaging 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 in the barrier blades described above.
[0003]
Therefore, in order to further reduce the size of the camera, measures such as eliminating the barrier that opens and closes and protecting it with a separate lens cap, or protecting the objective surface of the optical system with hard glass are taken. It has also been made.
As other techniques, techniques disclosed in Japanese Patent Application Laid-Open Nos. 7-225409 and 2000-098451 are proposed.
In JP-A-7-225409, the position of the lens surface closest to the object, for example, the plane position perpendicular to the optical axis of the objective lens and in contact with the convex surface is used as a reference in the direction of the optical axis in conjunction with the opening / closing operation of the barrier blade. In the closed state, the barrier blades and the like are positioned forward of the planar position, and in the open state, the barrier blades and the like are positioned rearward of the planar position. A barrier mechanism that ensures a wide effective optical path range of an optical system is disclosed. 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 so as to cover only the optical system portion, thereby reducing the size of the lens barrier mechanism. Yes.
[0004]
[Problems to be solved by the invention]
However, the technique disclosed in the above Japanese Patent Laid-Open No. 7-225409 has a problem that the mechanism of the barrier device is complicated and a malfunction in operation is likely to occur, which is disclosed in Japanese Patent Laid-Open No. 2000-098451. In the technology, although the optical system itself is protected by a barrier, there is not enough description for storing or protecting the mechanism part itself of the barrier device, and further for storing or protecting the mechanism part itself of the barrier device. There is a risk that the configuration becomes complicated or large. If the mechanical part of the barrier device itself 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 system lens barrel, is configured by using a technique for increasing the number of conventional blades, The thickness dimension in the optical axis direction of the system barrier device increases, and the distance from the lens front surface on the most object side to the barrier cover front surface increases. For this reason, the effective optical path range based on the effective optical path diameter is further expanded, and it becomes increasingly difficult to secure a retreat space for the blades. In addition, there is a technique for securing 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 downsizing.
[0005]
The present invention has been made in view of the above-described circumstances, and appropriately and reliably protects the optical system and the lens barrel without causing an increase in dimension in the optical axis direction due to an increase in the number of barrier members and a complicated configuration. In addition, an object of the present invention is to provide an optical system barrier device and an optical apparatus that are simple in structure, hardly cause operational problems, and that can reduce the size of the lens barrel.
That is, an object of claim 1 of the present invention is to provide an optical barrier apparatus that can reduce the number of barrier members and reduce the manufacturing cost, in particular, in addition to the above objects.
The second object of the present invention is to provide an optical system barrier device with a particularly simple structure.
The object of the third aspect of the present invention is to provide an optical system barrier device having a simple configuration and reliable operation.
A fourth object of the present invention is to provide an optical barrier device which is particularly simple in construction.
[0006]
It is an object of the present invention to provide an optical system barrier device that is particularly simple in structure and reliable in operation.
A sixth object of the present invention is to provide an optical system barrier device that is simpler in construction and reliable in operation .
The object of claim 7 of the present invention is to appropriately and reliably protect the optical system and the lens barrel without incurring an increase in dimension in the optical axis direction due to an increase in the number of barrier members and a complicated configuration. It is an object of the present invention to provide an optical apparatus that requires only a small number of barrier members in a system barrier device, has a simple configuration, and can reduce manufacturing costs.
The object of claim 8 of the present invention is to appropriately and reliably protect the optical system and the lens barrel without causing an increase in the dimension in the optical axis direction due to an increase in the number of barrier members and a complicated configuration, It is an object of the present invention to provide a camera that requires only a small number of barrier members in a system barrier device, has a simple configuration, and can reduce manufacturing costs.
[0007]
[Means for Solving the Problems]
In order to achieve the above-described object, an optical system barrier device according to the present invention described in claim 1 is provided.
A barrier member disposed on the objective side of the optical system and entering the effective optical path of the optical system to block a part of the effective optical path;
One end is coupled to the barrier member, and the sheet-shaped member having an elastic and light-shielding properties,
With
When the barrier member enters the effective optical path, the sheet-like member is stretched,
The barrier member and the sheet-like member are provided so as to be retractable from the effective optical path,
An end portion different from the end portion of the sheet-like member is coupled to a member forming an inner surface of a barrier member chamber in which the sheet-like member is accommodated when the barrier member is retracted from the effective optical path. It is a feature.
[0008]
The optical barrier device according to the present invention described in claim 2 is characterized in that the sheet-like member is made of a flexible material.
Further, the optical system barrier device according to the present invention described in claim 3, when said barrier member and said sheet-like member is retracted from the effective optical path, the sheet-like member is bent housed in the barrier member chamber It is characterized by that.
Further, the optical system barrier device according to the present invention described in claim 4, when said barrier member and said sheet-like member is retracted from the effective optical path, said barrier member is accommodated in the barrier member chamber It is characterized by.
[0009]
An optical barrier device according to the present invention described in claim 5 is
By the elastic restoring force of the sheet member, the sheet-like member is characterized by being bent housed in the barrier member chamber.
An optical system barrier apparatus according to the present invention described in claim 6 is:
The sheet-like member has elastic elasticity.
When the barrier member and the sheet-shaped member is retracted from the effective optical path it is characterized by comprising an elastic deformable member to be contracted housed in the barrier member chamber by the elastically stretchable.
Optical instrument according to the present invention described in 請 Motomeko 7 is characterized in that an optical system barrier device according to any one of claims 1-6.
The optical apparatus described in claim 8 is a camera.
[0010]
[Action]
That is, the optical system barrier device according to the present invention is disposed on the objective side of the optical system, and enters the effective optical path of the optical system and blocks a part of the effective optical path;
One end is coupled to the barrier member, and the sheet-shaped member having an elastic and light-shielding properties,
With
When the barrier member enters the effective optical path, the sheet-like member is stretched,
The barrier member and the sheet-like member are provided so as to be retractable from the effective optical path,
An end portion different from the end portion of the sheet-like member is coupled to a member forming an inner surface of a barrier member chamber in which the sheet-like member is accommodated when the barrier member is retracted from the effective optical path. Constitute.
With such a configuration, the optical system and the lens barrel can be appropriately and reliably protected without causing an increase in the dimension in the optical axis direction due to an increase in the number of barrier members and a complicated configuration. The problem hardly occurs and the lens barrel can be reduced in size. In particular, the number of barrier members is small, and the manufacturing cost can be reduced.
[0011]
In the optical barrier device according to the present invention, the sheet-like member is made of a flexible material.
With such a configuration, in particular, an optical barrier device with a simpler configuration can be provided.
Further, the optical system barrier device according to the present invention, when the barrier member and the sheet-shaped member is retracted from the effective optical path, the sheet-like member is bent housed in the barrier member chamber.
With such a configuration, it is possible to provide an optical system barrier device with a simple configuration and reliable operation.
Further, the optical system barrier device according to the present invention, when the barrier member and the sheet-shaped member is retracted from the effective optical path, the barrier member is housed in the barrier member chamber.
Such a configuration makes the configuration particularly simple .
[0012]
Further, the optical system barrier device according to the present invention, the elastic restoring force of the sheet member, the sheet-shaped member is bent housed in the barrier member chamber.
With such a configuration, in particular, the configuration can be further simplified.
Further, in the optical system barrier device according to the present invention, the sheet-like member has elastic stretchability,
When the barrier member and the sheet-shaped member is retracted from the effective optical path, including a telescoping deformation member which is contracted housed in the barrier member chamber by the elastically stretchable.
With such a configuration, it is possible to provide an optical barrier device that is particularly simpler in configuration.
[0013]
Also, the optical instrument according to the present invention includes an optical system barrier device according to any one of claims 1-6.
With such a configuration, the optical system and the lens barrel can be appropriately and surely protected, in particular, without increasing the dimension in the optical axis direction due to an increase in the number of barrier members and complicating the configuration. In this case, the number of barrier members is small, the configuration is simple, and the manufacturing cost can be reduced.
The optical apparatus according to the present invention is a camera.
With such a configuration, the optical system and the lens barrel can be appropriately and surely protected without causing an increase in the dimension in the optical axis direction due to an increase in the number of barrier members and a complicated configuration. The number of sheets can be reduced, the configuration is simple, and the manufacturing cost can be reduced.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, based on an embodiment of the present invention, an optical system barrier device and a camera of the present invention will be described in detail with reference to the drawings.
1 to 3 show a configuration of a main part of an optical system barrier device according to one 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. 2 is a front oblique view schematically showing the configuration of the optical system barrier device of FIG. FIG. 3 is an exploded perspective view of the optical system barrier device shown in FIG. 4 to 7 are partial detailed views of the optical system barrier device. FIG. 4 is a sectional view taken along line AA of FIG. 1 in the barrier closed state, and FIG. 5 is a barrier in the barrier closed state. FIG. 6 is a cross-sectional view taken along the line AA of FIG. 1 in the barrier open state, and FIG. 7 is a configuration of the lever portion of the optical system barrier device of FIG. It is a schematic diagram shown in detail.
[0015]
The configuration shown in FIGS. 1 to 7 has been described by taking an example of an optical system barrier device used in a digital camera in this case, but is also applicable to an optical device such as a single-lens reflex camera, a lens shutter camera, and a video camera. And can be applied in substantially 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, a first transition spring 6a, A second transition spring 6b, a first sheet-like member 7a, a second sheet-like member 7b, a barrier cover 8, a lens barrel Y, and a barrier base Z are provided.
In the optical system barrier device according to this embodiment, the barrier blades 2a and 2b are made to enter the effective optical path region of the optical system 1 with respect to the optical system 1 such as the photographing optical system, and the effective optical path of the optical system 1 is changed to the barrier blade. The barrier is closed as shown in FIGS. 1, 2, 4 and 5 by shielding with 2a and 2b. In addition, as shown in FIG. 6, the first and second barrier blades 2a and 2b are retracted from the effective optical path region of the optical system 1 to set the barrier open state.
[0016]
That is, in this optical system barrier device, the first barrier blade 2a and the second barrier blade 2b form a pair and enter the effective optical path region B of the optical system 1 when the barrier is closed, and are effective when the barrier is open. Retreat from the optical path region B. The ring lever 3 is used to shift the barrier blades 2a and 2b to the open state. The small lever 4 operates the ring lever 3 by using an operating force when the lens barrel Y (a part of which is shown in FIGS. 4 and 6) shifts to the retracted state. The return spring 5 returns the ring lever 3 to the open state when the operating force is released from the small lever 4 when the lens barrel Y shifts from the housed state to the photographing state. When the ring lever 3 returns to the open state, the first and second transition springs 6a and 6b urge the barrier blades 2a and 2b to shift to the open state. The first and second sheet-like members 7a and 7b are made of a flexible material, and when the first and second barrier blades 2a and 2b are in the closed state, the opening of the barrier cover 8 and these The gap between the barrier blades 2a and 2b is shielded.
[0017]
The configuration and operation of the above-described optical system barrier device will be described in more detail with reference to exploded perspective views shown in FIGS. 2 and 3 and 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. At the time of storage, the lens barrel Y is moved backward together with the optical system barrier device, so that an arrow is shown in FIG. 3 of the small lever 4 by a convex portion (not clearly shown) provided on the stationary lens barrel substrate. A force in the direction of arrow D acts on the portion indicated by D. When a force as indicated by an arrow D is applied to the small lever 4, a force indicated by an arrow E in FIG. 3 is generated by rotation about the illustrated rotation center 4c. Since the portion of the small lever 4 to which the force of the arrow E acts is located at a 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 in 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 ring lever 3 is regulated by the cam portions H and G of the ring lever 3. The engaging bosses Bb and Ba of the barrier blades 2a and 2b that have been made are in a freely movable state, and the barrier blades 2a and 2b are closed by the first and second transition springs 6a and 6b.
[0018]
The ring lever 3 is urged to the opposite side of the arrow F by the return spring 5 when the small lever 4 is not retracted, that is, when the force applied to the arrow D portion of the small lever 4 is stopped. Thus, the opening degree of the barrier blades 2a and 2b is controlled and driven in the opening direction. The return spring 5 is engaged with the barrier base Z at a position indicated by a broken line in FIG.
Next, the engaged state of the first and second transition springs 6a and 6b is shown in FIG. In FIG. 5, engagement portions Za and Zb formed on the barrier base Z are shown. The first and second transition springs 6a and 6b are engaged with the engaging portions Za and Zb and the barrier blades 2a and 2b, respectively. Details of the return spring 5 described above are shown 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.
[0019]
With the above-described configuration, in the barrier closed state, as shown in FIG. 1, the sheet-like members 7 a and 7 b made of a flexible material have the opening of the barrier cover 8 together with the barrier blades 2 a and 2 b. Fully shielded. Each of the sheet-like members 7a and 7b is light-tightly coupled so that one end edge does not leak to the outer edge of the barrier blades 2a and 2b, and the other end edge is the barrier cover 8, the lens barrel Y, or the barrier base. It is fixed to Z or the like. These sheet-like members 7a and 7b are stretched with a certain amount of tension in the barrier closed state. In the barrier open state, the sheet-like members 7a and 7b are retracted outside the opening of the barrier cover 8 together with the barrier blades 2a and 2b, and are formed outside the opening of the barrier cover 8 as shown in FIG. It is bent and stored so as to fold inside the space, that is, the barrier blade chamber.
The sheet-like members 7a and 7b are bent and housed in the barrier blade chamber when the barrier is open. This is because the sheet-like members 7a and 7b interfere with the effective optical path and each operating component when the barrier blades 2a and 2b are opened and closed. This is to prevent it.
[0020]
Therefore, the sheet-like members 7a and 7b may be formed so as to have an appropriate elastic restoring force so that the sheet-like members 7a and 7b are appropriately bent at appropriate positions when the barrier is opened and closed. The sheet-like members 7a and 7b are formed to have elastic expansion and contraction, and the sheet-like members 7a and 7b are extended unless the light blocking property is hindered in the barrier closed state, and the sheet-like members 7a and 7b are opened in the barrier open state. It is good also as a structure which is elastically shrunk and fits in a barrier blade chamber.
In addition, the above-described optical system barrier device may be incorporated into a digital camera, for example, and may be a digital camera with an optical system barrier device, and a single lens reflex camera with an optical system barrier device and an optical system are applied by applying the same configuration. The present invention can also be applied to optical devices such as a lens shutter camera with a barrier device and a video camera, and can be applied in substantially the same manner.
The present invention can also be applied to barrier devices for future ultra-wide-angle optical systems.
[0021]
【The invention's effect】
As described above, according to the present invention, the optical system and the lens barrel can be protected appropriately and reliably without increasing the dimension in the optical axis direction due to an increase in the number of barrier members and complicating the configuration. In addition, it is possible to provide an optical barrier device and an optical apparatus that are simple and hardly cause operational problems, and that can reduce the size of the lens barrel.
That is, according to the optical system barrier device of claim 1 of the present invention, a barrier member that is disposed on the objective side of the optical system, enters the effective optical path of the optical system, and shields a part of the effective optical path;
One end is coupled to the barrier member, and the sheet-shaped member having an elastic and light-shielding properties,
With
When the barrier member enters the effective optical path, the sheet-like member is stretched,
The barrier member and the sheet-like member are provided so as to be retractable from the effective optical path,
When an end portion different from the end portion of the sheet-like member is coupled to a member forming an inner surface of a barrier member chamber in which the sheet-like member is accommodated when the barrier member is retracted from the effective optical path. ,
The optical system and the lens barrel are appropriately and surely protected without increasing the dimension in the optical axis direction due to the increase in the number of barrier members and the complexity of the configuration, the configuration is simple, and operation problems are unlikely to occur. Although it is possible to reduce the size of the body, in particular, the number of barrier members can be reduced, and the manufacturing cost can be reduced.
[0022]
Further, according to the optical system barrier device of the second aspect of the present invention, since the sheet-like member is made of a flexible material, the configuration can be further simplified.
According to the optical system barrier device according to claim 3 of the present invention, when the barrier member and the sheet-shaped member is retracted from the effective optical path, structure and said sheet-like member is bent housed in the barrier member chamber By doing so, it is possible to provide an optical barrier device that is particularly simple in structure and reliable in operation.
According to the optical system barrier device according to claim 4 of the present invention, when the barrier member and the sheet-shaped member is retracted from the effective optical path, by the barrier member is housed in the barrier member chamber, structure Is even easier.
[0023]
According to the optical system barrier device according to claim 5 of the present invention, the elastic restoring force of the sheet-like member, by the sheet-shaped member is bent housed in the barrier member chamber,
In particular, the operation is further ensured with a simple configuration.
According to the optical barrier device of claim 6 of the present invention, the sheet-like member has elastic stretchability,
When the barrier member and the sheet-shaped member is retracted from the effective optical path, by including an elastic deformable member to be contracted housed in the barrier member chamber by the elastically stretchable, in particular, to further simplify the structure Can do .
According to the optical apparatus of the seventh aspect of the present invention, by including the optical system barrier device according to any one of the first to sixth aspects, an optical axis direction due to an increase in the number of barrier members in the optical system barrier device. The optical system and the lens barrel can be appropriately and reliably protected without increasing the size and the complexity of the configuration, and the configuration is simple, hardly causing operational problems, and the size of the lens barrel can be reduced. In particular, it is possible to provide an optical apparatus that requires only a small number of barrier members and can reduce the manufacturing cost.
The optical apparatus according to claim 8 of the present invention is a camera, so that the optical system and the lens barrel can be appropriately and reliably secured without increasing the dimension in the optical axis direction due to an increase in the number of barrier members and complicating the configuration. In particular, the number of barrier members in the camera can be reduced, the configuration is simple, and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a configuration in a barrier closed state when an optical system barrier device according to one embodiment of the present invention is viewed from an object side, that is, a subject side.
2 is an exploded perspective view schematically showing a configuration of the optical barrier device of FIG.
3 is an exploded perspective view schematically showing the configuration of the optical barrier device of 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. 1;
5 is a plan view showing a state in which a 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 the line AA in the barrier open state of the optical system barrier device of FIG. 1;
7 is a front view showing a ring lever portion of the optical system barrier device of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical system 2a, 2b Barrier blade | wing 3 Ring lever 4 Small lever 5 Return spring 6a, 6b 1st, 2nd transition spring 7a, 7b Sheet-like member 8 Barrier cover Y Lens barrel Z Barrier base

Claims (8)

A barrier member disposed on the objective side of the optical system and entering the effective optical path of the optical system to block a part of the effective optical path;
One end is coupled to the barrier member, and the sheet-shaped member having an elastic and light-shielding properties,
With
When the barrier member enters the effective optical path, the sheet-like member is stretched,
The barrier member and the sheet-like member are provided so as to be retractable from the effective optical path,
An end portion different from the end portion of the sheet-like member is coupled to a member that forms an inner surface of a barrier member chamber in which the sheet-like member is accommodated when the barrier member is retracted from the effective optical path. An optical barrier device. The optical system barrier device according to claim 1, wherein the sheet-like member is made of a flexible material. When the barrier member and the sheet-shaped member is retracted from the effective optical path, the optical system barrier device according to claim 1 or 2, wherein the sheet-shaped member, characterized in that it is bent housed in the barrier member chamber . When the barrier member and the sheet-shaped member is retracted from the effective optical path, the optical according to any one of claims 1-3, wherein the barrier member is characterized in that it is housed in the barrier member chamber System barrier device. Wherein the elastic restoring force of the sheet-like member, the optical system barrier device according to any one of claims 1 to 4, wherein the sheet-shaped member, characterized in that it is bent housed in the barrier member chamber. The sheet-like member has elastic elasticity.
When the barrier member and the sheet-shaped member is retracted from the effective optical path, either by the elastic stretchability of the claims 1-5, characterized in that it comprises an elastic deformable member to be contracted housed in the barrier member chamber The optical system barrier device according to claim 1. Optical apparatus having an optical system barrier device according to any one of claims 1-6. The optical apparatus according to claim 7, wherein the optical apparatus is a camera.

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