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JP3589757B2 - Rotary filter device for television camera - Google Patents
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JP3589757B2 - Rotary filter device for television camera - Google Patents

Rotary filter device for television camera Download PDF

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Publication number
JP3589757B2
JP3589757B2 JP27054995A JP27054995A JP3589757B2 JP 3589757 B2 JP3589757 B2 JP 3589757B2 JP 27054995 A JP27054995 A JP 27054995A JP 27054995 A JP27054995 A JP 27054995A JP 3589757 B2 JP3589757 B2 JP 3589757B2
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Japan
Prior art keywords
filter
filter device
turret
television camera
rotary
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JP27054995A
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Japanese (ja)
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JPH0993485A (en
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知美 井口
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富士写真光機株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は、テレビジョンカメラの光学系の所定位置に設けられる回転フィルタ装置に関するものである。
【0002】
【従来の技術】
テレビジョンカメラにおいては異なる撮影条件に対応するため、あるいは普通撮影と特殊撮影とを選択的に行うため、その光学系の所定位置に回転フィルタ装置が設けられることが多い。
この回転フィルタ装置は、例えば特開昭58−30283号公報に開示されているように、同一円上の複数箇所にフィルタ装着部が形成されたターレットの各フィルタ装着部に円形のフィルタが各々装着された構成となっており、ターレットの回転により各フィルタが光学系の光路上に位置し得るようになっている。そして、回転フィルタ装置におけるフィルタ装着構造は、一般に、図5および図6に示すような構造が採用されている。
【0003】
すなわち、これらの図は、4枚フィルタの例を示すものであるが、円盤状のターレット2の一側面の同一円上4箇所には、フィルタ16と略同じ大きさの開口を有する環状溝部4が形成されており、これら環状溝部4により各フィルタ16の外周コーナ部を支持するようになっている。そして、これら各環状溝部4にフィルタ16を配置した状態で、ターレット2の環状溝部4相互間に小判型の止め板6をネジ8で締付け固定することによりこれら各止め板6をその両側のフィルタ16と係合させ、これによりターレット2へのフィルタ装着を行うようになっている。
【0004】
【発明が解決しようとする課題】
しかしながら、このようなフィルタ装着構造を有する回転フィルタ装置においては、フィルタ装着を行うためにターレットのほかに止め板とネジとが必要となるので、部品点数が多くなり、また、回転フィルタ装置の軽量化を図ることが困難であり、さらには、フィルタ交換を行う際のフィルタ着脱作業が面倒であり、かつその作業の際に部品紛失のおそれがあるという問題がある。
本発明は、このような事情に鑑みてなされたものであり、上記問題を解消することができるテレビジョンカメラ用回転フィルタ装置を提供することを目的とするものである。
【0005】
【課題を解決するための手段】
本発明に係るテレビジョンカメラ用回転フィルタ装置は、テレビジョンカメラ光学系の所定位置に設けられる回転フィルタ装置であって、
同一円上の複数箇所にフィルタ装着部が形成されたターレットの前記各フィルタ装着部に所定形状のフィルタが各々装着されてなり、前記ターレットの回転により前記各フィルタが前記光学系の光路上に位置し得るように構成された回転フィルタ装置において、
前記各フィルタ装着部が、前記フィルタと略同じ大きさの開口を形成するとともに該フィルタの一側面の外周コーナ部を支持する環状支持部と、この環状支持部を複数箇所において前記開口の半径方向外方へ凹状に切欠き形成してなる複数の凹部と、前記環状支持部に支持された前記フィルタの他側面の外周縁部と係合するよう、前記各凹部から前記開口中心側へ突出形成された複数の係合片とを備えてなることを特徴とするものである。
【0006】
上記「凹部」は、フィルタの着脱が可能な態様であれば、その数および形成箇所は特に限定されるものではないが、例えば、前記開口の一直径上の対向する2箇所に形成するように構成することも可能である。
【0007】
【発明の実施の形態】
以下、図面を用いて、本発明の実施例について説明する。
図1は、本発明に係るテレビジョンカメラ用回転フィルタ装置の一実施例を示す正面図であり、図2および3は、図1のII−II 線断面図およびIII−III 線断面図であり、図4は、本実施例に係る回転フィルタ装置を備えたテレビジョンカメラを示す図である。
【0008】
図1に示すように、この回転フィルタ装置10は、図中1点鎖線で示す同一円上の4箇所にフィルタ装着部14が形成された樹脂製のターレット12の各フィルタ装着部14に円形のフィルタ16が各々装着されてなっている。上記ターレット12の中心には軸孔18が形成されており、この軸孔18の周囲にはギヤ部20が設けられている。そして、軸孔18に回転支持軸(図示せず)を挿通させた状態で、ギヤ部20に他の駆動ギヤ(図示せず)を噛合させてこれを駆動することにより、ターレット12を回転軸線Ax回りに回転させるようになっている。
【0009】
図4に示すように、回転フィルタ装置10は、テレビジョンカメラ100の光学系において、撮像光学系102と色分解プリズム光学系104との間に設けられ、ターレット12の回転により各フィルタ16が光学系の光路上に位置し得るようになっている。
図1および図2に示すように、上記ターレット12の各フィルタ装着部14は、環状支持部22と、1対の凹部24と、1対の係合片26とを備えてなっている。
上記環状支持部22は、フィルタ16と略同じ大きさの開口を形成するとともに該フィルタ16の面16aの外周コーナ部を支持するようになっている。また、上記1対の凹部24は、環状支持部24を開口の一直径上(ターレット12の半径方向と直交する方向の直径上)の対向する2箇所においてその半径方向外方へ凹状に切り欠くようにして形成されている。そして、上記1対の係合片26は、各凹部24から開口中心側へ突出形成されており、環状支持部22に支持されたフィルタ16の面16bの外周縁部と係合するようになっている。これら各係合片26は、図3に示すように、図中上下方向に弾性変形し得るように薄板状に形成されており、その板厚分だけターレット12の面12aより段状に盛り上がっている。
【0010】
図1に示すように、上記ターレット12の面12aは、上記1対の係合片26よりもターレット12の半径方向外方側の部分が、フィルタ16の直径と略同じ幅で一段下がっており、これによりフィルタ着脱ガイド部28を形成している。
【0011】
以上詳述したように、本実施例においては、環状支持部22に外周コーナ部を支持されたフィルタ16の外周縁部に1対の係合片26を係合させることにより各フィルタ装着部14においてフィルタ16を所定位置に保持するようになっているが、上記各係合片26は環状支持部22を切り欠き形成してなる1対の凹部24から突出形成されているので、係合片26の弾性変形を利用してフィルタ16の装着および取外しをワンタッチで容易に行うことができる。したがって、従来のようにネジを用いた回転フィルタ装置に比して、フィルタ交換時の着脱作業性を向上させることができ、かつ、その作業の際に従来のような部品紛失が生じるおそれをなくすことができる。また、このような構成を採用することにより、各フィルタ装着部14をターレット12の一部分として一体で射出成形することができるので、回転フィルタ装置の製造容易化を図ることができ、かつ、その部品点数を最小限に抑えることができる。
【0012】
しかも、本実施例においては、図1に示すように、ターレット12に、その回転軸線Ax方向に関してアンダカットになる部分が存在しないので、スライド型を用いることなくターレット12を射出成形することができ、これにより、金型および成形費用を増大させることなく上記効果を得ることができる。
また、本実施例においては、各フィルタ装着部14にフィルタ着脱ガイド部28が形成されているので、フィルタ16を若干斜めにすればターレット12の半径方向外方からフィルタ16を環状支持部22に装着することが可能となり、フィルタ装着時における各係合片26の弾性変形必要量を少なくすることができる。
【0013】
本発明の実施例において使用されるフィルタは、特定種類のフィルタに限定されるものではなく、例えばNDフィルタ、色温度フィルタ、クロススクリーンフィルタ等を適当に組み合わせて使用することが可能であり、また、各フィルタ装着部に装着されるフィルタ毎にその直径が異なるものに設定するようにしてもよい。また、これらのフィルタの形状としては、必ずしも円形のものに限られず、円形円周部の一部を切り取った形状としたり、矩形状とすることも可能である。また、本実施例においては、ターレット12に90°間隔で4箇所にフィルタ装着部14が形成された回転フィルタ装置について説明したが、3箇所以下あるいは5箇所以上にフィルタ装着部を形成するようにしてもよく、また、これらフィルタ装着部は必ずしも等角度間隔で形成する必要はない。さらに、上記のように直径が互いに異なるフィルタを装着する場合においても、各フィルタ装着部14毎にその環状支持部22の内径寸法を適宜選択するようにすれば、本実施例の構成を採用することができる。
【0014】
さらに、本実施例においては、凹部24および係合片26が環状支持部22開口の一直径上の対向する2箇所に形成されているが、フィルタ着脱可能であれば3箇所以上に形成するようにしてもよい。
また、本実施例においては、フィルタ着脱ガイド部28を形成することにより、ターレット12の半径方向外方からのフィルタ装着を可能ならしめて係合片26の弾性変形必要量を少なくするようにしたが、フィルタ着脱ガイド部28を設けず、係合片26の弾性変形のみに依存してフィルタ装着を行うようにしてもよい。
【0015】
【発明の効果】
本発明によれば、環状支持部に外周コーナ部を支持されたフィルタの外周縁部に複数の係合片を係合させることにより各フィルタ装着部においてフィルタを所定位置に保持するようになっており、上記各係合片が環状支持部の複数箇所においてこれを切り欠き形成してなる凹部から突出形成されているので、係合片の弾性変形を利用してフィルタの装着および取外しをワンタッチで容易に行うことができる。したがって、従来のようにネジを用いた回転フィルタ装置に比して、フィルタ交換時の着脱作業性を向上させることができ、かつ、その作業の際に従来のような部品紛失が生じるおそれをなくすことができる。また、このような構成を採用することにより、各フィルタ装着部をターレットの一部分として一体で射出成形することができるので、回転フィルタ装置の製造容易化を図ることができ、かつ、その部品点数を最小限に抑えることができる。
【図面の簡単な説明】
【図1】本発明の一実施例に係るテレビジョンカメラ用回転フィルタ装置を示す正面図
【図2】図1のII−II 線断面図
【図3】図1のIII−III 線断面拡大図
【図4】本実施例に係る回転フィルタ装置を備えたテレビジョンカメラの光学系を示す図
【図5】従来例に係るテレビジョンカメラ用回転フィルタ装置を示す正面図
【図6】従来例に係るテレビジョンカメラ用回転フィルタ装置を示す断面図
【符号の説明】
10 回転フィルタ装置
12 ターレット
14 フィルタ装着部
16 フィルタ
22 環状支持部
24 凹部
26 係合片
28 フィルタ着脱ガイド部
100 テレビジョンカメラ
Ax 回転軸線
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary filter device provided at a predetermined position in an optical system of a television camera.
[0002]
[Prior art]
2. Description of the Related Art In a television camera, a rotary filter device is often provided at a predetermined position of an optical system in order to cope with different photographing conditions or to selectively perform ordinary photographing and special photographing.
As disclosed in, for example, Japanese Patent Application Laid-Open No. 58-30283, this rotary filter device has a circular filter mounted on each filter mounting portion of a turret having a plurality of filter mounting portions formed on the same circle. Each filter can be positioned on the optical path of the optical system by rotation of the turret. The filter mounting structure in the rotary filter device generally adopts a structure as shown in FIGS.
[0003]
That is, these figures show an example of a four-sheet filter, and an annular groove 4 having an opening of substantially the same size as the filter 16 is provided at four locations on the same circle on one side surface of the disc-shaped turret 2. Are formed, and the outer peripheral corners of each filter 16 are supported by these annular grooves 4. Then, with the filter 16 disposed in each of the annular grooves 4, an oval-shaped stopper plate 6 is fixed between the annular grooves 4 of the turret 2 with screws 8 so that each of the stopper plates 6 is fitted to the filter on both sides thereof. 16 so that the filter can be mounted on the turret 2.
[0004]
[Problems to be solved by the invention]
However, in the rotary filter device having such a filter mounting structure, a stop plate and a screw are required in addition to the turret in order to mount the filter, so that the number of parts is increased, and the weight of the rotary filter device is reduced. In addition, there is a problem that it is difficult to implement the filter, and it is troublesome to attach and detach the filter when replacing the filter, and there is a risk that parts may be lost during the operation.
The present invention has been made in view of such circumstances, and has as its object to provide a rotary filter device for a television camera that can solve the above-described problem.
[0005]
[Means for Solving the Problems]
A rotary filter device for a television camera according to the present invention is a rotary filter device provided at a predetermined position of a television camera optical system,
A filter of a predetermined shape is mounted on each of the filter mounting portions of the turret in which the filter mounting portions are formed at a plurality of locations on the same circle, and each of the filters is positioned on the optical path of the optical system by rotation of the turret. In a rotary filter device configured to
Each of the filter mounting portions forms an opening having substantially the same size as the filter, and has an annular support portion that supports an outer peripheral corner portion on one side of the filter. A plurality of recesses formed by forming notches in an outward concave shape, and protrusions formed from the respective recesses toward the center of the opening so as to engage with the outer peripheral edge of the other side surface of the filter supported by the annular support portion. And a plurality of engaging pieces provided.
[0006]
The number and location of the “recess” are not particularly limited as long as the filter can be attached and detached. For example, the “recess” may be formed at two opposing locations on one diameter of the opening. It is also possible to configure.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a rotary filter device for a television camera according to the present invention, and FIGS. 2 and 3 are sectional views taken along lines II-II and III-III in FIG. FIG. 4 is a diagram showing a television camera provided with the rotary filter device according to the present embodiment.
[0008]
As shown in FIG. 1, the rotary filter device 10 has a circular shape on each filter mounting portion 14 of a resin turret 12 in which filter mounting portions 14 are formed at four locations on the same circle indicated by a dashed line in the figure. Each of the filters 16 is mounted. A shaft hole 18 is formed at the center of the turret 12, and a gear portion 20 is provided around the shaft hole 18. Then, in a state where a rotation support shaft (not shown) is inserted through the shaft hole 18, another driving gear (not shown) is meshed with the gear portion 20 and driven, thereby rotating the turret 12 to the rotation axis. It is designed to rotate around Ax.
[0009]
As shown in FIG. 4, the rotary filter device 10 is provided between the imaging optical system 102 and the color separation prism optical system 104 in the optical system of the television camera 100. It can be located on the optical path of the system.
As shown in FIGS. 1 and 2, each filter mounting portion 14 of the turret 12 includes an annular support portion 22, a pair of concave portions 24, and a pair of engagement pieces 26.
The annular support portion 22 forms an opening having substantially the same size as the filter 16 and supports the outer peripheral corner of the surface 16a of the filter 16. In addition, the pair of concave portions 24 are formed by notching the annular support portion 24 at two opposing locations on one diameter of the opening (on the diameter in a direction perpendicular to the radial direction of the turret 12) outward in the radial direction. It is formed as described above. The pair of engagement pieces 26 are formed so as to protrude from the respective recesses 24 toward the center of the opening, and engage with the outer peripheral edge of the surface 16 b of the filter 16 supported by the annular support portion 22. ing. As shown in FIG. 3, each of the engagement pieces 26 is formed in a thin plate shape so that it can be elastically deformed in the vertical direction in the figure, and rises stepwise from the surface 12a of the turret 12 by the thickness thereof. I have.
[0010]
As shown in FIG. 1, on the surface 12 a of the turret 12, a portion on the radially outer side of the turret 12 with respect to the pair of engagement pieces 26 is stepped down by substantially the same width as the diameter of the filter 16. Thus, the filter attaching / detaching guide portion 28 is formed.
[0011]
As described in detail above, in the present embodiment, each of the filter mounting portions 14 is engaged with the pair of engagement pieces 26 by engaging the outer peripheral edge of the filter 16 having the outer peripheral corner portion supported by the annular support portion 22. , The filter 16 is held at a predetermined position. However, since each of the engagement pieces 26 is formed so as to protrude from a pair of recesses 24 formed by cutting out the annular support portion 22, the engagement pieces 26 Utilizing the elastic deformation of 26, the filter 16 can be easily mounted and removed with one touch. Therefore, as compared with the conventional rotary filter device using screws, it is possible to improve the attachment / detachment workability at the time of filter replacement, and to eliminate the risk of losing parts as in the conventional case at the time of the work. be able to. In addition, by adopting such a configuration, each filter mounting portion 14 can be injection-molded integrally as a part of the turret 12, so that manufacturing of the rotary filter device can be facilitated and its components can be achieved. Points can be minimized.
[0012]
Moreover, in the present embodiment, as shown in FIG. 1, the turret 12 has no undercut portion in the rotation axis Ax direction, so that the turret 12 can be injection-molded without using a slide mold. Thereby, the above-mentioned effect can be obtained without increasing the cost of the mold and the molding.
Further, in this embodiment, since the filter attachment / detachment guide portion 28 is formed in each filter attachment portion 14, if the filter 16 is slightly inclined, the filter 16 is attached to the annular support portion 22 from the outside in the radial direction of the turret 12. Mounting can be performed, and the amount of elastic deformation required of each engagement piece 26 at the time of mounting the filter can be reduced.
[0013]
The filter used in the embodiment of the present invention is not limited to a particular type of filter, and may be, for example, an ND filter, a color temperature filter, a cross-screen filter, or the like in appropriate combination. Alternatively, the diameter may be set to be different for each filter mounted on each filter mounting portion. Further, the shape of these filters is not necessarily limited to a circular shape, but may be a shape obtained by cutting off a part of a circular circumferential portion, or a rectangular shape. Further, in the present embodiment, the rotary filter device in which the filter mounting portions 14 are formed at four positions at 90 ° intervals on the turret 12 has been described, but the filter mounting portions are formed at three or less positions or at five or more positions. Alternatively, these filter mounting portions need not necessarily be formed at equal angular intervals. Further, even when filters having different diameters are mounted as described above, the configuration of the present embodiment is adopted if the inner diameter of the annular support portion 22 is appropriately selected for each filter mounting portion 14. be able to.
[0014]
Further, in the present embodiment, the concave portion 24 and the engagement piece 26 are formed at two opposing positions on one diameter of the opening of the annular support portion 22. However, if the filter is removable, it is formed at three or more positions. It may be.
Further, in the present embodiment, by forming the filter attaching / detaching guide portion 28, it is possible to mount the filter from the outside in the radial direction of the turret 12, thereby reducing the required amount of elastic deformation of the engaging piece 26. Alternatively, the filter mounting may be performed only by the elastic deformation of the engagement piece 26 without providing the filter attaching / detaching guide portion 28.
[0015]
【The invention's effect】
According to the present invention, the filter is held at a predetermined position in each filter mounting portion by engaging a plurality of engagement pieces with the outer peripheral edge of the filter having the outer peripheral corner portion supported by the annular support portion. Since each of the engagement pieces is formed so as to protrude from a concave portion formed by cutting out the annular support portion at a plurality of locations, the mounting and removal of the filter can be performed with one touch by utilizing the elastic deformation of the engagement piece. It can be done easily. Therefore, as compared with the conventional rotary filter device using screws, it is possible to improve the attachment / detachment workability at the time of filter replacement, and to eliminate the risk of losing parts as in the conventional case at the time of the work. be able to. In addition, by adopting such a configuration, each filter mounting portion can be injection-molded integrally as a part of the turret, so that manufacturing of the rotary filter device can be facilitated and the number of parts can be reduced. Can be minimized.
[Brief description of the drawings]
FIG. 1 is a front view showing a rotary filter device for a television camera according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIG. FIG. 4 is a diagram showing an optical system of a television camera provided with a rotary filter device according to the present embodiment. FIG. 5 is a front view showing a rotary filter device for a television camera according to a conventional example. Sectional view showing such a rotary filter device for a television camera.
Reference Signs List 10 rotary filter device 12 turret 14 filter mounting portion 16 filter 22 annular support portion 24 concave portion 26 engaging piece 28 filter attaching / detaching guide portion 100 television camera Ax rotation axis

Claims (2)

テレビジョンカメラ光学系の所定位置に設けられる回転フィルタ装置であって、
同一円上の複数箇所にフィルタ装着部が形成されたターレットの前記各フィルタ装着部に所定形状のフィルタが各々装着されてなり、前記ターレットの回転により前記各フィルタが前記光学系の光路上に位置し得るように構成された回転フィルタ装置において、
前記各フィルタ装着部が、前記フィルタと略同じ大きさの開口を形成するとともに該フィルタの一側面の外周コーナ部を支持する環状支持部と、この環状支持部を複数箇所において前記開口の半径方向外方へ凹状に切欠き形成してなる複数の凹部と、前記環状支持部に支持された前記フィルタの他側面の外周縁部と係合するよう、前記各凹部から前記開口中心側へ突出形成された複数の係合片とを備えてなることを特徴とするテレビジョンカメラ用回転フィルタ装置。
A rotary filter device provided at a predetermined position of a television camera optical system,
A filter of a predetermined shape is mounted on each of the filter mounting portions of the turret in which the filter mounting portions are formed at a plurality of locations on the same circle, and each of the filters is positioned on the optical path of the optical system by rotation of the turret. In a rotary filter device configured to
Each of the filter mounting portions forms an opening having substantially the same size as the filter, and has an annular support portion that supports an outer peripheral corner portion on one side of the filter. A plurality of recesses formed by forming notches in an outward concave shape, and protrusions formed from the respective recesses toward the center of the opening so as to engage with the outer peripheral edge of the other side surface of the filter supported by the annular support portion. A rotary filter device for a television camera, comprising:
前記凹部が、前記開口の一直径上の対向する2箇所に形成されていることを特徴とする請求項1記載のテレビジョンカメラ用回転フィルタ装置。2. The rotary filter device for a television camera according to claim 1, wherein the concave portions are formed at two opposite positions on one diameter of the opening.
JP27054995A 1995-09-25 1995-09-25 Rotary filter device for television camera Expired - Fee Related JP3589757B2 (en)

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JP2011070150A (en) 2009-04-14 2011-04-07 Nippon Hoso Kyokai <Nhk> Nd filter, television camera, and method for manufacturing nd filter
US9645345B2 (en) * 2015-07-30 2017-05-09 Molecular Devices, Llc Optical element alignment and retention for optical instruments
JP7245184B2 (en) * 2020-01-29 2023-03-23 富士フイルム株式会社 Optical unit and imaging device
JP7041831B1 (en) * 2021-03-01 2022-03-25 好英 湯本 A camera equipped with a turret type optical element device, an optical element unit used in a turret type optical element device, a turret used in a turret type optical element device, a turret type optical element device and a lensless camera.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101815769B1 (en) 2016-06-29 2018-01-05 경희대학교 산학협력단 Optical filter apparatus

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