JPH0446307A - Lens moving device - Google Patents
Lens moving deviceInfo
- Publication number
- JPH0446307A JPH0446307A JP15593190A JP15593190A JPH0446307A JP H0446307 A JPH0446307 A JP H0446307A JP 15593190 A JP15593190 A JP 15593190A JP 15593190 A JP15593190 A JP 15593190A JP H0446307 A JPH0446307 A JP H0446307A
- Authority
- JP
- Japan
- Prior art keywords
- feed screw
- piece
- lens
- driving
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 239000004519 grease Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はビデオカメラ等に用いるレンズ移動装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a lens moving device used in a video camera or the like.
従来の技術
近年、ビデオカメラのレンズとして、前玉による合焦方
式に代わってマスターレンズ等の前玉以外のレンズによ
って合焦させるインナーフォーカス方式が提案されてい
る。2. Description of the Related Art In recent years, as a video camera lens, an inner focus method has been proposed in which a lens other than the front lens, such as a master lens, is used to focus instead of a focusing method using a front lens.
以下図面を参照しながら、上述した従来のレンズ移動装
置の一例について説明する。An example of the conventional lens moving device mentioned above will be described below with reference to the drawings.
第４図は従来のレンズ移動装置の要部断面図を示すもの
である。第４図において外筒１はマスターレンズ群２を
固定した内筒３を光軸方向１０に摺動可能にボールベア
リング４を介装して保持している。また、外筒１に固定
したモータ取付体８には軸６に送りねじを形成したモー
タ５が固定され軸６の一端をモータ取付体８に装着した
軸受に保持されている。前記軸６の送りねじ部６ａには
、めじねを有する移動片７が螺合し、この駆動片９と内
筒３とが連結アーム９により結合されている。FIG. 4 shows a sectional view of a main part of a conventional lens moving device. In FIG. 4, an outer cylinder 1 holds an inner cylinder 3 to which a master lens group 2 is fixed, with a ball bearing 4 interposed therebetween so as to be able to slide in the optical axis direction 10. Further, a motor 5 having a shaft 6 formed with a feed screw is fixed to a motor mounting body 8 fixed to the outer cylinder 1, and one end of the shaft 6 is held by a bearing mounted on the motor mounting body 8. A moving piece 7 having a female thread is screwed into the feed screw portion 6a of the shaft 6, and this driving piece 9 and the inner cylinder 3 are connected by a connecting arm 9.
このとき、外筒１にはアーム９を光軸方向に移動可能に
する光軸方向の長穴９ａが設けられている。At this time, the outer cylinder 1 is provided with a long hole 9a in the optical axis direction that allows the arm 9 to move in the optical axis direction.
以上の構成により、モータ５の軸６が回転することによ
って移動片７．アーム９及び内筒３が光軸方向に直線運
動し、内筒３に固定されたマスターレンズ群２を合焦さ
せている。With the above configuration, when the shaft 6 of the motor 5 rotates, the movable piece 7. The arm 9 and the inner tube 3 move linearly in the optical axis direction to focus the master lens group 2 fixed to the inner tube 3.
発明が解決しようとする課題
しかしながら上記のような構成では、送りねじと移動片
との摺動性を向上させるためねじにグリス等を塗布する
必要があり、移動片の内周全体が送りねじに接している
とグリスの粘性のためモータの負荷が増大し、低温での
温度特性を悪化させるため高トルクのモータが必要とな
り、屋外で使用するビデオカメラにおいて重要な要素で
ある消費電力・重量・体積が共に増加するという問題が
有った。また、送りねじと移動片との間には摺動するた
めのクリアランスが有り、このクリアランスのためモー
タの軸の回転に対するマスターレンズ群の移動距離にヒ
ステリシスが発生し、合焦動作が不安定になると言う問
題もあった。さらに、騒音が発生すると言う問題も有し
ていた。Problems to be Solved by the Invention However, in the above configuration, it is necessary to apply grease or the like to the screw in order to improve the slidability between the feed screw and the moving piece, and the entire inner circumference of the moving piece is attached to the feed screw. If it is in contact with the grease, the viscosity of the grease increases the load on the motor, which worsens the temperature characteristics at low temperatures, requiring a high-torque motor. There was a problem that the volume increased at the same time. In addition, there is a clearance between the feed screw and the moving piece for sliding, and this clearance causes hysteresis in the movement distance of the master lens group relative to the rotation of the motor shaft, making focusing operation unstable. There was also a problem. Furthermore, there was also the problem of noise generation.
本発明は上記問題点に鑑み、モータの軸の送りねじの周
の１８０°以下に螺合する切欠けナットを送りねじに挟
み込むことにより、負荷を低減させるとともにヒステリ
シスの発生を防止し、かつ騒音のない静かなレンズ移動
装置を提供するものである。In view of the above-mentioned problems, the present invention reduces the load, prevents the occurrence of hysteresis, and reduces noise by inserting a notched nut screwed into the feed screw at 180 degrees or less of the circumference of the feed screw of the motor shaft. This provides a quiet lens moving device with no noise.
課題を解決するための手段
上記課題を解決するために本発明のレンズ移動装置は、
レンズを保持するレンズ枠と、このレンズ枠を光軸方向
に移動可能に保持する第１のガイド手段と、送りねじ部
を有するモータ軸と一体の駆動軸と、駆動軸を駆動する
モータと、この駆動軸の送りねじの円周の１８０°以下
に螺合する切欠けナットを有する駆動片と、この移動片
を摺動かつ回動可能に保持する第２のガイド手段と、前
記移動片を駆動軸の送りねじに挟み込む手段とを備えた
ものである。Means for Solving the Problems In order to solve the above problems, the lens moving device of the present invention includes:
A lens frame that holds a lens, a first guide means that holds the lens frame movably in the optical axis direction, a drive shaft that is integrated with a motor shaft that has a feed screw portion, and a motor that drives the drive shaft. a drive piece having a notch nut that is threaded into the feed screw of the drive shaft at 180 degrees or less of the circumference; a second guide means for slidably and rotatably holding the movable piece; It is equipped with a means for inserting it into the feed screw of the drive shaft.
作用
上記した構成により、切欠けナットは送りねじとの螺合
による接触面積が少なくなり、グリスの粘性による負荷
の増加を防止することができるので低トルクのモータの
使用が可能となり、低消費電力化・小型軽量化が達成で
きる。又、挟み込む手段は切欠けナットを送りねじに押
圧付勢するので送りねじと切欠けナットとの螺合による
バックラッシュをなくし、移動距離のヒステリシスを減
少させることかでき、正確な合焦動作を行うことができ
る。Effect With the above configuration, the contact area of the notch nut due to threading with the feed screw is reduced, and it is possible to prevent an increase in load due to the viscosity of the grease, making it possible to use a low-torque motor, resulting in low power consumption. It is possible to achieve smaller size and lighter weight. In addition, since the pinching means presses the notch nut against the feed screw, it is possible to eliminate backlash caused by the screw engagement between the feed screw and the notch nut, reduce hysteresis in the moving distance, and ensure accurate focusing operation. It can be carried out.
実施例
以下本発明の一実施例のレンズ移動装置について、図面
を参照しながら説明する。Embodiment Hereinafter, a lens moving device according to an embodiment of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例におけるレンズ移動装置の構
成を示す要部断面図で、第２図、第３図は第１図の主要
部分の分解の斜視図である。第１図、第２図、第３図に
おいてマスターレンズ１１゜１２は樹脂製のレンズ枠１
３に加熱カシメ等の手段により保持されており、前記レ
ンズ枠１３は固定鏡筒１４の内部に配設された第１のガ
イドポール１５．１６により光軸方向１７に摺動可能に
保持されている。また、レンズ枠１３の上部には、モー
タ２０の軸に形成された送りねじ２１ａを有する駆動軸
２１に、円周１２０″だけ螺合する切欠けナット１８ａ
よりなる駆動片１８を挿入する溝１３ａが設けられてい
る。この溝１３ａは駆動片１８を挿入したとき光軸方向
には隙間がなく、光軸を直角方向にはわずかな隙間をも
って設けられている。FIG. 1 is a sectional view of a main part showing the configuration of a lens moving device in an embodiment of the present invention, and FIGS. 2 and 3 are exploded perspective views of the main parts of FIG. 1. In Figures 1, 2, and 3, the master lenses 11 and 12 are lens frames 1 made of resin.
The lens frame 13 is held slidably in the optical axis direction 17 by first guide poles 15 and 16 disposed inside the fixed lens barrel 14. There is. Further, on the upper part of the lens frame 13, a notched nut 18a is screwed onto the drive shaft 21 having a feed screw 21a formed on the shaft of the motor 20 by a circumference of 120''.
A groove 13a is provided for inserting the drive piece 18 made of the following. This groove 13a is provided with no gap in the optical axis direction when the drive piece 18 is inserted, but with a slight gap in the direction perpendicular to the optical axis.
また、切欠ナツト１８ａを有する駆動片１８はその一端
を駆動軸２１と平行してモータ取付体２３に配設された
第２のガイドボール２４に摺動がっ、回転可能なように
保持されるとともに駆動片１８は駆動軸２１を挟み込む
ためのアーム１８ｃが構成されていることにより、第２
のガイドポール２４を支点として、駆動軸２１の送りね
し２１ａに押圧付勢され、切欠けナット１８ａと送りね
じ２１ａは隙間なく螺合されている。なお、前記駆動軸
２１と駆動片１８の挟み圧力は、レンズ片１３と駆動片
１８との保持力より大きくとっている。Further, the drive piece 18 having the notched nut 18a has one end thereof slid onto a second guide ball 24 disposed on the motor mounting body 23 in parallel with the drive shaft 21, and is rotatably held. At the same time, the drive piece 18 is configured with an arm 18c for sandwiching the drive shaft 21, so that the second
The feed screw 21a of the drive shaft 21 is pressed with the guide pole 24 as a fulcrum, and the notch nut 18a and the feed screw 21a are screwed together without any gap. Note that the pinching pressure between the drive shaft 21 and the drive piece 18 is set to be greater than the holding force between the lens piece 13 and the drive piece 18.
以上のように構成されたレンズ移動装置について、以下
その動作を説明する。The operation of the lens moving device configured as described above will be described below.
モータ２０が回転すると送りねじ２１ａを有する駆動軸
２１を押圧付勢し、小さいクリアランスで螺合した切欠
けナット１８ａを有する駆動片１８は第２のガイドボー
ル゛２４を摺動して光軸方向に移動するのでこの駆動片
１８に係合したレンズ枠１３はモータ２０の回転角に対
し、正しく所定の移動距離を得、マスターレンズ１１．
１２の合焦動作をする。このとき、送りねじ２１ａに螺
合する切欠けねじ１８ａは、送りねじ２１ａとの接触部
分が周方向に対し１２０”Ｌかなく、接触による抵抗ロ
スを小さくしている。When the motor 20 rotates, it presses and urges the drive shaft 21 with the feed screw 21a, and the drive piece 18 with the notched nut 18a screwed together with a small clearance slides on the second guide ball 24 and moves in the optical axis direction. Therefore, the lens frame 13 engaged with the driving piece 18 correctly obtains a predetermined movement distance with respect to the rotation angle of the motor 20, and the master lens 11.
Performs 12 focusing operations. At this time, the notch screw 18a screwed into the feed screw 21a has a contact portion with the feed screw 21a of 120"L in the circumferential direction, thereby reducing resistance loss due to contact.
以上のように本実施例によれば、モータの駆動軸にレン
ズ枠を係合した切欠けナットを有する駆動片を挟み込み
、この駆動片によってレンズを駆動する負荷を低減させ
低トルクのモータの使用が可能となるとともに、ヒステ
リシスの防止した高精度のレンズ移動装置を提供するも
のである。As described above, according to this embodiment, a drive piece having a notched nut that engages a lens frame is inserted into the drive shaft of the motor, and the load of driving the lens is reduced by this drive piece, and a low-torque motor is used. The present invention provides a highly accurate lens moving device that can prevent hysteresis.
発明の効果
以上のように本発明は、レンズを保持するレンズ枠と、
このレンズ枠を光軸方向に移動可能に保持する第１のガ
イド手段と、送りねじ部を有するモータの駆動軸と、こ
の駆動軸の送りねじに螺合する切欠けナットを有する駆
動片と、この駆動片を保持する第２のガイド手段と、前
記切欠けナットを駆動軸に押圧付勢する挾み込み手段と
を備えることにより送りねじ部と切欠ナツトとの接触面
積が少なくなり、グリスの粘性による負荷の増加を防止
することができ、低トルクのモータの使用が可能となり
、低消費電力化・小型軽量化が達成できる。又、ナツト
を送りねじ部に押圧しているため、モータの回転に対す
るレンズ枠の移動のヒステリシスを減少させ、正確な合
焦動作を行なうことができるといったすぐれた効果を得
ることができる。Effects of the Invention As described above, the present invention provides a lens frame that holds a lens;
a first guide means for movably holding the lens frame in the optical axis direction; a drive shaft of a motor having a feed screw portion; a drive piece having a notch nut screwed into the feed screw of the drive shaft; By providing the second guide means for holding the drive piece and the clamping means for pressing and biasing the notch nut against the drive shaft, the contact area between the feed screw portion and the notch nut is reduced, and grease is removed. It is possible to prevent an increase in load due to viscosity, and it is possible to use a low-torque motor, resulting in lower power consumption, smaller size, and lighter weight. Further, since the nut is pressed against the feed screw portion, the hysteresis of the movement of the lens frame relative to the rotation of the motor can be reduced, and an excellent effect can be obtained in that accurate focusing operation can be performed.
第１図は本発明の一実施例におけるレンズ移動装置の構
成を示す要部断面図、第２図、第３図は第１図の主要部
分の分解斜視図、第４図は従来のレンズ移動装置の要部
断面図である。
１１、．１２・・・・・・マスターレンズ、１３・・・
・・・レンズ枠、１５，１６・・・・・・第１のガイド
ボール、１８・・・・・・駆動片、１８ａ・・・・・・
駆動片の切欠けナット部、１８ｃ・・・・・・駆動片の
挟みアーム部、２０・・・・・−モータ、２１・・・・
・・駆動軸、２１ａ・・・・・・送りねじ、２４・・・
・・・第２のガイドボール。
第２図
第
図
第
図
＋８ｂ
第
図FIG. 1 is a sectional view of the main parts showing the configuration of a lens moving device in an embodiment of the present invention, FIGS. 2 and 3 are exploded perspective views of the main parts of FIG. 1, and FIG. 4 is a conventional lens moving device. FIG. 2 is a cross-sectional view of the main parts of the device. 11. 12... Master lens, 13...
... Lens frame, 15, 16... First guide ball, 18... Drive piece, 18a...
Notched nut part of drive piece, 18c...Pinch arm part of drive piece, 20...-Motor, 21...
...Drive shaft, 21a...Feed screw, 24...
...Second guide ball. Figure 2 Figure Figure +8b Figure
Claims (1)
に移動可能に保持する第１のガイド手段と、送りねじを
有するモータ軸と一体の駆動軸と、この駆動軸の送りね
じの円周１８０°以下に螺合する切欠けナットを有する
駆動片と、この駆動片を摺動かつ回動可能に保持する第
２のガイド手段と、前記駆動片は前記駆動軸に挟み込む
手段とを備えたレンズ移動装置。A lens frame that holds a lens, a first guide means that holds this lens frame movably in the optical axis direction, a drive shaft that is integrated with a motor shaft that has a feed screw, and a circumference of the feed screw of this drive shaft. A drive piece having a notched nut that is screwed together at an angle of 180° or less, second guide means for slidably and rotatably holding the drive piece, and means for sandwiching the drive piece on the drive shaft. Lens moving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15593190A JP2890689B2 (en) | 1990-06-14 | 1990-06-14 | Lens moving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15593190A JP2890689B2 (en) | 1990-06-14 | 1990-06-14 | Lens moving device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0446307A true JPH0446307A (en) | 1992-02-17 |
| JP2890689B2 JP2890689B2 (en) | 1999-05-17 |
Family
ID=15616643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15593190A Expired - Lifetime JP2890689B2 (en) | 1990-06-14 | 1990-06-14 | Lens moving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2890689B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001063333A1 (en) * | 2000-02-25 | 2001-08-30 | Matsushita Electric Industrial Co., Ltd. | Lens driver |
| JP2006304405A (en) * | 2005-04-15 | 2006-11-02 | Canon Inc | Driving device, control method, and program |
| JP2007006551A (en) * | 2005-06-21 | 2007-01-11 | Canon Inc | Driving apparatus |
| JP2007034108A (en) * | 2005-07-29 | 2007-02-08 | Nidec Copal Corp | Lens driving device |
| EP1821142A1 (en) * | 2006-02-20 | 2007-08-22 | Nikon Corporation | Linear drive with lead screw and driven nut and camera with such a drive |
| JP6456463B1 (en) * | 2017-11-21 | 2019-01-23 | ナショナル チェン クン ユニバーシティー | Series elastic linear actuator |
-
1990
- 1990-06-14 JP JP15593190A patent/JP2890689B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001063333A1 (en) * | 2000-02-25 | 2001-08-30 | Matsushita Electric Industrial Co., Ltd. | Lens driver |
| US6654557B2 (en) | 2000-02-25 | 2003-11-25 | Matsushita Electric Industrial Co., Ltd. | Lens driving apparatus having tapered positioning dowel |
| CN100340887C (en) * | 2000-02-25 | 2007-10-03 | 松下电器产业株式会社 | Lens driver |
| JP2006304405A (en) * | 2005-04-15 | 2006-11-02 | Canon Inc | Driving device, control method, and program |
| JP2007006551A (en) * | 2005-06-21 | 2007-01-11 | Canon Inc | Driving apparatus |
| JP2007034108A (en) * | 2005-07-29 | 2007-02-08 | Nidec Copal Corp | Lens driving device |
| EP1821142A1 (en) * | 2006-02-20 | 2007-08-22 | Nikon Corporation | Linear drive with lead screw and driven nut and camera with such a drive |
| US8009974B2 (en) | 2006-02-20 | 2011-08-30 | Nikon Corporation | Power transmission and camera |
| JP6456463B1 (en) * | 2017-11-21 | 2019-01-23 | ナショナル チェン クン ユニバーシティー | Series elastic linear actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2890689B2 (en) | 1999-05-17 |
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