JP2004279659A - Screw-feeding mechanism and spatial light transmitting device - Google Patents
Screw-feeding mechanism and spatial light transmitting device Download PDFInfo
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- JP2004279659A JP2004279659A JP2003069949A JP2003069949A JP2004279659A JP 2004279659 A JP2004279659 A JP 2004279659A JP 2003069949 A JP2003069949 A JP 2003069949A JP 2003069949 A JP2003069949 A JP 2003069949A JP 2004279659 A JP2004279659 A JP 2004279659A
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Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、一般的なネジ送り機構のナットと被駆動側のステージとの結合の改良に関し、特に、遠隔地に対し光無線で情報伝達を行う光空間伝送装置のトラッキング機構に好適なものである。
【0002】
【従来の技術】
一般にネジ送り機構を使用する場合、駆動方向の基準となる軸と、雄ネジを固定側に、雄ネジと係合するナットを被駆動側のステージに取り付ける事が多い。また、ナットはステージに対して固定される。この場合、駆動方向の基準となる軸と雄ネジの平行出しや、ナットと雄ネジの位置合わせなどの作業が必要である。
【0003】
また、ナットを樹脂等の弾性材で成型し、ナットがたわむことによって位置合わせ作業を省いている場合もある。
【0004】
【発明が解決しようとする課題】
上記のようなネジ送り機構の場合、平行出しや位置合わせ作業に時間がかかるだけでなく、位置合わせが不完全な場合には偏荷重やこじれが発生する。このような偏荷重やこじれはネジ送り機構の精度の悪化や、寿命に大きく影響する。
【0005】
また、ナットを弾性材で成型した場合には、ナットがステージの駆動方向にもたわんでしまうためにステージ上で駆動される物の質量が小さい場合以外は使用することができない。
【0006】
また、光空間伝送装置のトラッキング機構にネジ送り機構を使用する場合には、長期間の屋外での使用による部材の劣化や、温度変化などによる部材の変形により定期的なメンテナンスが必要で、大きな負担になっている。
【0007】
また、ネジ送り機構に使用されるナットの駆動軸の振れや偏芯が原因で偏荷重やこじれが発生し、ネジ送り機構の精度の悪化が問題となっている。
【0008】
【課題を解決するための手段】
上記のような問題を解決するために、本発明では、ステージの駆動方向の基準となる駆動軸と、前記駆動軸とほぼ平行に設置された第一のネジの回転を第二のネジで受けて前記ステージを駆動するネジ送り機構において、第二のネジの周りに回転と摺動が可能な軸を少なくとも1軸設けている。
【0009】
つまり、本発明では、第二のネジ(=ナット)を第一のネジ(=雄ネジ)の回転方向と、ステージの駆動方向には高剛性で保ち、他の全ての方向には自由度のあるネジ送り機構を提供している。
【0010】
【発明の実施の形態】
(実施例)
図1に本発明の実施例のネジ送り機構の構成を示す。雄ネジ8が回転するとナット1から第一の環状部材2、軸3、第二の環状部材4、軸5、ベース部6を経てステージ7に伝えられ、ステージ7は駆動軸9に沿って図中左右方向に駆動する。
【0011】
図2に本発明の実施例のナット部の正面の断面図を示す。ナット1は第一の連結部材2に一体に固定されている。第一の連結部材の外周部には軸3が同軸上に固定される。軸3は第二の環状部材4に設けられた嵌合穴4aにガタ無くスムーズな回転と摺動が可能なように係合している。第二の環状部材4の外周部には嵌合穴4aと直交する軸上に軸5が同軸上に固定される。軸5はベース部6に設けられた嵌合穴6aにガタ無くスムーズな回転と摺動が可能なように係合している。ベース部6はステージに固定される。
【0012】
以上ような構成により、雄ネジ8が回転してナット1に駆動力が発生した時に、ナット1はステージ7の駆動方向と雄ネジ8の回転方向には高剛性で保持されるため、ナット1はステージ7に対して一定の位置に保たれ、雄ネジ8の回転はそのままステージ7の駆動に変換される。
【0013】
図3には駆動軸9に対して雄ネジ8が偏芯した時のナット1の様子を示す。図3(a)では軸3の軸方向に雄ネジ8が偏芯している。また、図3(b)では軸5の軸方向に雄ネジ8が偏芯している。さらに、図3(c)では、軸3と軸5の両方の軸方向に雄ネジ8が偏芯しているが、いずれの場合も軸は嵌合穴に対して軸方向のスムーズな摺動が可能であるため、ナット1は雄ネジの偏芯に合わせて自動で調芯する。
【0014】
図4には図1のA−A断面を示す。この時に雄ネジ8が駆動軸9に対し、軸3の周りに傾いて取り付いたときの様子を図4(a)に示す。この時、軸3は嵌合穴4aとスムーズな回転が可能であるためにナットは雄ネジの傾きに対して追従することができる。
【0015】
図5には図1のB−B断面を示す。この時、雄ネジ8が駆動軸9に対し、軸5の周りに傾いて取り付いたときの様子を図5(a)に示す。この時、軸5は嵌合穴6aとスムーズな回転が可能であるためにナット1は雄ネジ8の傾きに対して追従することができる。
【0016】
また、本実施例のネジ送り機構のナット1は、上記のような偏芯や軸の傾きが同時に起こった場合でも自動で雄ネジ8に調芯し、角度を合わせることが可能である。
【0017】
図6には本実施例のネジ送り機構を光空間伝送装置のトラッキング機構に使用する時の構成を示す。光軸を合わせるためにレンズ素子を例えば鉛直方向と水平方向に駆動する時には、それぞれの方向に少なくとも一組のネジ送り機構を構成し駆動する(図示は鉛直方向のみ)。相手側装置との光軸のずれを検出すると、制御回路からトラッキングの駆動回路に信号が送られ、駆動回路はモータを駆動させる。モータは雄ネジを回転させ、ステージを駆動させる。この時、雄ネジ8とナット1との間にネジガタが発生する場合には、ガタ取りのための付勢手段を設けてナット1が雄ネジ8に対して常に一定の方向に押し付けられるように構成する。
【0018】
以上説明したように、本実施例のネジ送り機構では、ナット1が雄ネジ8に対して自動で調芯と角度合わせを行うために、組立時の調整作業が不要になり、ネジ送り機構の寿命も飛躍的に向上する。また、駆動方向と雄ネジ8の回転方向の剛性が高く、ガタも少ないため、重量物の駆動も高精度で行うことが可能になる。さらに、雄ネジ8との干渉を起こさない限り、取り付け角度等の制約がなくなるため、ナット1を取り付けるために角度を決めた座などを設ける必要が無く、作りやすい形状の部品にナットを取り付けるだけで良くなる。
【0019】
また、本実施例のネジ送り機構を光空間伝送装置の光軸合わせに使用することにより、無調整化による製品の組立の簡易化や組立時間の短縮が可能になり、ネジ送り機構の長寿命化により製品出荷後の定期補修の回数を減らすことが可能になる。また、ネジガタに対する付勢手段を設けている時には、一層高精度な制御が可能になる。
【0020】
[本発明の実施態様]
本発明の様々な例と実施形態が示され説明されたが、当業者であれば、本発明の趣旨と範囲は本明細書内の特定の説明と図に限定されるのではなく、本願特許請求の範囲に全て述べられた様々の修正と変更に及ぶことが理解されるであろう。
【0021】
本発明の実施態様の例を以下に列挙する。
【0022】
[実施態様1]
ステージ77の駆動方向の基準となる駆動軸と、前記駆動軸とほぼ平行に設置された第一のネジの回転を第二のネジで受けて前記ステージを駆動するネジ送り機構において、
第二のネジの周りに回転と摺動が可能な軸を少なくとも1軸設けることを特徴とするネジ送り機構。
【0023】
[実施態様2]
第二のネジの周りに回転と摺動が可能な軸が、第二のネジを中心に直交する2軸有する実施態様2記載のネジ送り機構。
【0024】
[実施態様3]
第二のネジの周りに前記ステージに固定するためのベース部と、2つの連結部材が設けられ、第二のネジは第一の連結部材に一体固定され、第二のネジの付いた第一の連結部材に第一の軸が設けられており、第一の軸は第二の連結部材に設けられた嵌合穴に回転と軸方向の摺動が可能に係合され、第二の連結部材に前記嵌合穴と直交する位置に第二の軸を設け、第二の軸は前記ベース部に設けられた嵌合穴に回転と軸方向の摺動が可能に係合されることを特徴とした実施態様2記載のネジ送り機構。
【0025】
[実施態様4]
第二のネジの周りにはステージに固定するためのベース部と、2つの連結部材が設けられ、第二のネジは第一の連結部材に一体固定され、第二のネジの付いた第一の連結部材には第一の軸が設けられており、第一の軸は第二の連結部材に設けられた嵌合穴に回転と軸方向の移動が可能な軸受を介して係合され、第二の連結部材に前記嵌合穴と直交する位置に第二の軸を設け、第二の軸は前記ベース部に設けられた嵌合穴に回転と軸方向の移動が可能な軸受を介して係合されることを特徴とした実施態様2に記載のネジ送り機構。
【0026】
[実施態様5]
第一のネジの送り方向にバネなどの付勢手段を設けたことを特徴とする実施態様1〜4のいづれか一項記載のネジ送り機構。
【0027】
[実施態様6]
実施態様1〜5のいづれか一項記載のネジ送り機構を光学素子を駆動して相手側装置との光軸合わせを自動で行うトラッキング機構の駆動部に搭載したことを特徴とする光空間伝送装置。
【0028】
【発明の効果】
以上説明したように、本発明では、ステージの駆動方向の基準となる駆動軸と、前記駆動軸とほぼ平行に設置された第一のネジ(=雄ネジ)の回転を第二のネジ(=ナット)で受けて前記ステージを駆動するネジ送り機構において、第二のネジの周りに回転と摺動が可能な軸を少なくとも1軸設け、第二のネジ(=ナット)が駆動軸の振れや偏芯にスムーズに追従する効果を得ている。
【図面の簡単な説明】
【図1】本発明のネジ送り機構の代表的な構成
【図2】本発明のネジ送り機構のナット部の正面の断面図
【図3】(a)雄ネジが軸3の軸方向に偏芯した時のナットの調芯の様子
(b)雄ネジが軸5の軸方向に偏芯した時のナットの調芯の様子
(c)雄ネジが軸3と軸5の軸方向に偏芯した時のナットの調芯の様子
【図4】図1のA−A断面図
(a)雄ネジが軸3周りに傾いた時のナットの角度合わせの様子
【図5】図1のB−B断面図
(a)雄ネジが軸5周りに傾いた時のナットの角度合わせの様子
【図6】本発明のネジ送り機構を使用した光空間伝送装置の構成
【符号の説明】
1 ナット
2 第一の環状部材
3 軸
4 第二の環状部材
4a 嵌合穴
5 軸
6 ベース部
6a 嵌合穴
7 ステージ
8 雄ネジ
9 駆動軸[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in coupling between a nut of a general screw feed mechanism and a stage on a driven side, and is particularly suitable for a tracking mechanism of an optical space transmission device that transmits information wirelessly to a remote place. is there.
[0002]
[Prior art]
Generally, when a screw feed mechanism is used, it is often the case that a shaft serving as a reference in the driving direction, a male screw is mounted on the fixed side, and a nut engaging with the male screw is mounted on the stage on the driven side. The nut is fixed to the stage. In this case, it is necessary to perform operations such as parallelizing the shaft serving as a reference in the driving direction and the male screw, and positioning the nut and the male screw.
[0003]
In some cases, the nut is molded from an elastic material such as a resin, and the positioning operation is omitted by bending the nut.
[0004]
[Problems to be solved by the invention]
In the case of the above-described screw feed mechanism, not only takes time for parallel alignment and alignment work, but if the alignment is incomplete, an eccentric load and a twist are generated. Such an eccentric load or twisting deteriorates the accuracy of the screw feed mechanism and greatly affects the service life.
[0005]
Further, when the nut is formed of an elastic material, the nut is bent in the driving direction of the stage, so that the nut cannot be used except when the mass of the object driven on the stage is small.
[0006]
In addition, when a screw feed mechanism is used for the tracking mechanism of the optical space transmission device, periodic maintenance is necessary due to deterioration of the member due to long-term outdoor use and deformation of the member due to temperature change, etc. It is burdensome.
[0007]
In addition, eccentric load and kinking occur due to runout and eccentricity of the drive shaft of the nut used in the screw feed mechanism, and the accuracy of the screw feed mechanism is deteriorated.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, in the present invention, the rotation of a first screw installed substantially parallel to the drive shaft serving as a reference for the drive direction of the stage is received by a second screw. In the screw feed mechanism for driving the stage, at least one axis that can rotate and slide around the second screw is provided.
[0009]
That is, in the present invention, the second screw (= nut) is kept highly rigid in the rotation direction of the first screw (= male screw) and the driving direction of the stage, and has a high degree of freedom in all other directions. A screw feed mechanism is provided.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
(Example)
FIG. 1 shows a configuration of a screw feed mechanism according to an embodiment of the present invention. When the male screw 8 rotates, it is transmitted from the nut 1 to the stage 7 via the first annular member 2, the
[0011]
FIG. 2 is a front sectional view of a nut portion according to the embodiment of the present invention. The nut 1 is integrally fixed to the first connecting member 2. The
[0012]
With the above configuration, when the male screw 8 rotates and a driving force is generated in the nut 1, the nut 1 is held with high rigidity in the driving direction of the stage 7 and the rotating direction of the male screw 8. Is maintained at a fixed position with respect to the stage 7, and the rotation of the male screw 8 is directly converted into driving of the stage 7.
[0013]
FIG. 3 shows the state of the nut 1 when the male screw 8 is eccentric with respect to the drive shaft 9. In FIG. 3A, the male screw 8 is eccentric in the axial direction of the
[0014]
FIG. 4 shows an AA cross section of FIG. FIG. 4A shows a state in which the male screw 8 is attached to the drive shaft 9 at an angle around the
[0015]
FIG. 5 shows a BB cross section of FIG. FIG. 5A shows a state in which the male screw 8 is attached to the drive shaft 9 at an angle around the
[0016]
Further, the nut 1 of the screw feed mechanism of the present embodiment can automatically align the male screw 8 and adjust the angle even when the eccentricity and the inclination of the shaft occur simultaneously as described above.
[0017]
FIG. 6 shows a configuration when the screw feed mechanism of this embodiment is used for a tracking mechanism of an optical space transmission device. When the lens elements are driven, for example, in the vertical direction and the horizontal direction in order to align the optical axis, at least one set of screw feed mechanisms is configured and driven in each direction (only the vertical direction is shown). When the deviation of the optical axis from the partner device is detected, a signal is sent from the control circuit to the tracking drive circuit, and the drive circuit drives the motor. The motor rotates the male screw to drive the stage. At this time, if a thread play occurs between the male screw 8 and the nut 1, an urging means for removing the play is provided so that the nut 1 is always pressed against the male screw 8 in a fixed direction. Constitute.
[0018]
As described above, in the screw feed mechanism of the present embodiment, the nut 1 automatically adjusts the center and the angle with respect to the male screw 8, so that the adjustment work at the time of assembly is unnecessary, and the screw feed mechanism is not used. The life is also dramatically improved. In addition, since the rigidity in the driving direction and the rotation direction of the male screw 8 is high and there is little backlash, it is possible to drive heavy objects with high accuracy. Furthermore, as long as interference with the male screw 8 does not occur, there is no restriction on the mounting angle and the like, so there is no need to provide an angled seat or the like for mounting the nut 1, and the nut is simply mounted on a part having an easily formed shape. Will be better.
[0019]
In addition, by using the screw feed mechanism of the present embodiment for optical axis alignment of the optical space transmission device, it is possible to simplify the assembly of the product and shorten the assembly time by eliminating the need for adjustment, and to increase the life of the screw feed mechanism. This makes it possible to reduce the number of regular repairs after product shipment. Further, when the urging means for the screw backlash is provided, more accurate control is possible.
[0020]
[Embodiments of the present invention]
While various examples and embodiments of the present invention have been shown and described, those skilled in the art will recognize that the spirit and scope of the present invention is not limited to the specific description and figures herein, but rather to It will be appreciated that various modifications and changes are set forth which are all set forth in the following claims.
[0021]
Examples of embodiments of the present invention are listed below.
[0022]
[Embodiment 1]
A drive shaft serving as a reference for the drive direction of the stage 77, and a screw feed mechanism that receives the rotation of a first screw installed substantially parallel to the drive shaft with a second screw and drives the stage,
A screw feed mechanism provided with at least one axis rotatable and slidable around a second screw.
[0023]
[Embodiment 2]
3. The screw feed mechanism according to claim 2, wherein the axis capable of rotating and sliding around the second screw has two axes orthogonal to the second screw.
[0024]
[Embodiment 3]
A base portion for fixing to the stage around the second screw and two connecting members are provided, the second screw is integrally fixed to the first connecting member, and the first with the second screw is provided. Is provided with a first shaft, and the first shaft is rotatably and axially slidably engaged in a fitting hole provided in the second connection member, and the second connection A second shaft is provided at a position orthogonal to the fitting hole on the member, and the second shaft is engaged with the fitting hole provided on the base portion so as to be able to rotate and slide in the axial direction. The screw feed mechanism according to claim 2, wherein the screw feed mechanism is characterized in that:
[0025]
[Embodiment 4]
A base portion for fixing to the stage and two connecting members are provided around the second screw, the second screw is integrally fixed to the first connecting member, and the first screw with the second screw is provided. The connecting member is provided with a first shaft, the first shaft is engaged with a fitting hole provided in the second connecting member via a bearing capable of rotation and axial movement, A second shaft is provided on the second connecting member at a position orthogonal to the fitting hole, and the second shaft is provided on a fitting hole provided on the base portion via a bearing that can rotate and move in the axial direction. The screw feed mechanism according to claim 2, wherein the screw feed mechanism is engaged with the screw.
[0026]
[Embodiment 5]
The screw feed mechanism according to any one of embodiments 1 to 4, wherein a biasing means such as a spring is provided in a feed direction of the first screw.
[0027]
[Embodiment 6]
An optical space transmission device, wherein the screw feed mechanism according to any one of the first to fifth embodiments is mounted on a drive unit of a tracking mechanism that drives an optical element to automatically align an optical axis with a counterpart device. .
[0028]
【The invention's effect】
As described above, according to the present invention, the rotation of the first screw (= male screw) installed substantially parallel to the drive shaft and the second screw (= In a screw feed mechanism receiving the nut and driving the stage, at least one shaft that can rotate and slide around the second screw is provided, and the second screw (= nut) is used to prevent the deflection of the drive shaft. The effect of smoothly following the eccentricity is obtained.
[Brief description of the drawings]
FIG. 1 is a typical configuration of a screw feed mechanism of the present invention. FIG. 2 is a front sectional view of a nut portion of the screw feed mechanism of the present invention. FIG. Alignment of nut when cored (b) Alignment of nut when male screw is eccentric in the axial direction of shaft 5 (c) Eccentricity of male screw in axial direction of
Reference Signs List 1 nut 2 first
Claims (1)
第二のネジの周りに回転と摺動が可能な軸を少なくとも1軸設けることを特徴とするネジ送り機構。A drive shaft serving as a reference for the drive direction of the stage, and a screw feed mechanism that receives the rotation of a first screw installed substantially parallel to the drive shaft with a second screw and drives the stage,
A screw feed mechanism provided with at least one axis rotatable and slidable around a second screw.
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JP2003069949A JP4418637B2 (en) | 2003-03-14 | 2003-03-14 | Screw feeding mechanism and optical space transmission device |
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JP2003069949A JP4418637B2 (en) | 2003-03-14 | 2003-03-14 | Screw feeding mechanism and optical space transmission device |
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JP2004279659A true JP2004279659A (en) | 2004-10-07 |
JP2004279659A5 JP2004279659A5 (en) | 2006-04-20 |
JP4418637B2 JP4418637B2 (en) | 2010-02-17 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006266393A (en) * | 2005-03-24 | 2006-10-05 | Nissan Diesel Motor Co Ltd | Rotary shaft connection mechanism |
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2003
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JP2006266393A (en) * | 2005-03-24 | 2006-10-05 | Nissan Diesel Motor Co Ltd | Rotary shaft connection mechanism |
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