JPH03230110A - Lens driving method for lens barrel - Google Patents
Lens driving method for lens barrelInfo
- Publication number
- JPH03230110A JPH03230110A JP2541090A JP2541090A JPH03230110A JP H03230110 A JPH03230110 A JP H03230110A JP 2541090 A JP2541090 A JP 2541090A JP 2541090 A JP2541090 A JP 2541090A JP H03230110 A JPH03230110 A JP H03230110A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- stepping motor
- lens barrel
- driving
- division
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 22
- 230000005284 excitation Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
Landscapes
- Lens Barrels (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、レンズ鏡筒を有する産業機器のレンズ駆動方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lens driving method for industrial equipment having a lens barrel.
従来の技術
過去からレンズを持つ機器はあらゆる□分野に存在して
いるが、軽薄短小の要望からこれらの機器も、小型化、
軽量化へと進んできている。従ってレンズ部についても
同様に簡素化された構造を取らざるを得なくなってきて
いる。その様な背景の中レンズ部を動かす駆動源として
、小型直流モータが使用されてきている。Conventional technology Devices with lenses have existed in all kinds of fields since the past, but due to the desire to be lighter, thinner, and smaller, these devices have also become smaller and smaller.
Progress is being made towards weight reduction. Therefore, it is becoming necessary to adopt a similarly simplified structure for the lens portion. Against this background, small DC motors have been used as a drive source for moving the lens portion.
以下、図面を参照しながら上述した従来のレンズ駆動方
法についてビデオカメラを例にとり説明する。Hereinafter, the conventional lens driving method described above will be explained using a video camera as an example with reference to the drawings.
第５図、第６図は従来のレンズ駆動方法を示すもので、
第５図はその構成図、第６図はその制御方法を示すもの
である。Figures 5 and 6 show the conventional lens driving method.
FIG. 5 shows its configuration, and FIG. 6 shows its control method.
第５図において、５１は小型直流モータ、１２はレンズ
部、５３はレンズ部を動かす駆動ギヤ、１４はレンズ鏡
筒本体、５５はレンズ位置を検出する位置センサである
。第６図において、６６はモータ５１の駆動回路で、モ
ータ５１の回転方向と停止、起動を制御する。６７はレ
ンズ部の位置指令と、５５の位置センサからの現在位置
情報との差を算出する誤差アンプで、この出力値、つま
り、差が無くなる様にモータの位置を制御する。In FIG. 5, 51 is a small DC motor, 12 is a lens section, 53 is a drive gear for moving the lens section, 14 is a lens barrel body, and 55 is a position sensor for detecting the lens position. In FIG. 6, reference numeral 66 denotes a drive circuit for the motor 51, which controls the rotational direction, stopping, and starting of the motor 51. 67 is an error amplifier that calculates the difference between the position command of the lens unit and the current position information from the position sensor 55, and controls the motor position so that this output value, that is, the difference disappears.
以上の様に構成されたレンズ駆動方法について、以下そ
の動作を説明する。The operation of the lens driving method configured as above will be described below.
まず、複写体が動いたり、拡大しなければならなくなっ
た場合、レンズ位置を任意の位置に変えなければならな
い。この時、第６図に示す様にレンズ位置指令を変化さ
せ、小型直流モータを駆動し、ギヤを介して連結された
レンズ１２を移動させる。そして、任意の位置にレンズ
部が移動完了した時点で、モータを停止させる。First, if the copy object moves or needs to be enlarged, the lens position must be changed to an arbitrary position. At this time, the lens position command is changed as shown in FIG. 6, the small DC motor is driven, and the lens 12 connected through the gear is moved. Then, the motor is stopped when the lens unit has completely moved to an arbitrary position.
発明が解決しようとする課題
しかしながら、上記の様な構成ではレンズ鏡筒本体に、
小型直流モータとレンズＵ外に位置センサを有する事と
なり、重量の増加とコスト高となる。また、位置サーボ
を構成する回路ゆえ、回路コストが高くなり、位置性能
についてもモータの性能以外に、位置センサの性能及び
回路性能にまで関係する為、変動要因が多く、決して簡
素化されたレンズ駆動方法とは言い難い。Problems to be Solved by the Invention However, in the above configuration, the lens barrel body has
This requires a small DC motor and a position sensor outside the lens U, resulting in increased weight and cost. In addition, the circuit that constitutes the position servo increases the circuit cost, and the position performance is related not only to the motor performance but also to the position sensor performance and circuit performance, so there are many variables, so it is impossible to use a simplified lens. It's hard to say that it's a driving method.
また、本来、レンズ境部の有する剛性の強弱により発生
する振動成分については、小型直流モータと減速機構動
作時に、共振周波数帯域に両者が混存する為、完全に抑
制できるものではなく、これの抑制手段に防振ゴム等の
防振材料の使用をしなければならない等、不要な費用ま
で発生していた。In addition, vibration components that are originally generated due to the rigidity of the lens boundary cannot be completely suppressed because they coexist in the resonant frequency band when the small DC motor and deceleration mechanism operate. Unnecessary costs were incurred, such as the need to use anti-vibration materials such as anti-vibration rubber.
本発明は前述の欠点に鑑み、簡単にレンズ位置の制御を
実現し、同時に振動の低減化にも大きく効果のあるレン
ズ鏡筒のレンズ駆動方式を提供するしのである。In view of the above-mentioned drawbacks, the present invention provides a lens drive system for a lens barrel that can easily control the lens position and at the same time is highly effective in reducing vibrations.
課題を解決するための手段
上記課題を解決するために、本発明のレンズ鏡筒のレン
ズ駆動方法は、レンズ部の駆動源にステッピングモータ
を用い、また、その励磁方式を電流制御型の多分割駆動
方式とし、レンズ位置の調整を、モータの有する角度精
度と、多分割精度の２点からなる位置性能から決定され
る開ループ制御方式としたレンズ駆動方法である。Means for Solving the Problems In order to solve the above problems, the method for driving a lens barrel of the present invention uses a stepping motor as a drive source for the lens section, and uses a current-controlled multi-segment excitation method as the excitation method. This is a lens driving method in which the lens position is adjusted using an open-loop control method determined from positional performance consisting of two points: angular accuracy of the motor and multi-division accuracy.
作用
本発明は上記した方法によって、位置制御を容易にし且
つ、位置センサ等の部品を不要とする事ができ、重量の
軽減化に太き（効率があり、また、多分割駆動方式の採
用で、レンズ鏡筒の有する剛性の強弱により発生する振
動成分を容易に解決する事が可能となる。Effect of the present invention By using the method described above, the present invention facilitates position control, eliminates the need for parts such as a position sensor, is effective in reducing weight, and employs a multi-segment drive system. , it becomes possible to easily resolve vibration components generated due to the strength and weakness of the rigidity of the lens barrel.
実施例
以下本発明の一実施例のレンズ鏡筒のレンズ駆動方式に
ついて、図面を参照しながら説明する。EXAMPLE Hereinafter, a lens driving system for a lens barrel according to an example of the present invention will be described with reference to the drawings.
第１図はその概略の構成図を示し、第２図はその制御方
法を示し、第３図、第４図は多分割駆動方式を用いた時
のモータ電流波形を示すものである。FIG. 1 shows a schematic configuration diagram thereof, FIG. 2 shows its control method, and FIGS. 3 and 4 show motor current waveforms when using a multi-division drive system.
第１図において、１１はステッピングモータ、１２はレ
ンズ部、１３はレンズ部を直接動かす駆動ギヤ、１４は
レンズ鏡筒本体である。従来のそれと異なる点は、レン
ズ駆動源を小型直流モータのかわりにステッピングモー
タを用いた点と、位置センサを不要とした点である。１
３はレンズ駆動装置、また第２図において、１１はステ
ッピングモータ、２６は電流制御型多分割駆動回路、２
８はレンズ移動距離により分割数を可変とする分割数切
替回路である。In FIG. 1, 11 is a stepping motor, 12 is a lens section, 13 is a drive gear that directly moves the lens section, and 14 is a lens barrel body. The difference from the conventional method is that a stepping motor is used instead of a small DC motor as the lens drive source, and a position sensor is not required. 1
3 is a lens driving device; in FIG. 2, 11 is a stepping motor; 26 is a current-controlled multi-division driving circuit;
8 is a division number switching circuit that changes the division number depending on the lens movement distance.
以上のように構成されたレンズ鏡筒のレンズ駆動方式に
ついて、以下第１図、第２図、第３図。The lens drive system of the lens barrel configured as described above is shown in FIGS. 1, 2, and 3 below.
第４図を用いてその動作を説明する。The operation will be explained using FIG.
まず、第２図に於いて、複写体の変動によりレンズ位置
をある位置まで変化させる時、その移動距離を計算し、
その値から決定されるステッピングモータの移動ステッ
プ数を求める。この値により分割数を分割数切替回路２
８で決定し、次段の電流制御型多分割駆動回路２６でス
テッピングモータ１１に通電し、シャフトを回転させ第
１図に示す駆動ギヤ１３を動かし、１２のレンズ部を動
かす。この時、ステッピングモータには、前述の様に第
３図或いは第４図の電流が流れる。従ってスチッピング
モータのロータを任意の箇所で停止させる事が可能とな
り、レンズの微細調整をこれらの分割数だけを考慮すれ
ば簡単に実現できる。今、分割数切替回路２８を用いず
、ある一定の分割数だけで構成する事も可能であるが、
レンズ駆動の応答性、被写体の変化に対する追従性を考
えた場合は、本回路を用いた方がより優れたものを実現
する事が出来る。本実施例においては切替を２ｆｌＩ類
としているが、複数の場合においても同様である。First, in Figure 2, when the lens position is changed to a certain position due to the movement of the copying object, calculate the moving distance,
The number of moving steps of the stepping motor is determined from that value. Based on this value, the number of divisions is set by the division number switching circuit 2.
8, the current-controlled multi-division drive circuit 26 in the next stage energizes the stepping motor 11, rotates the shaft, moves the drive gear 13 shown in FIG. 1, and moves the lens section 12. At this time, the current shown in FIG. 3 or 4 flows through the stepping motor as described above. Therefore, it is possible to stop the rotor of the stepping motor at any location, and fine adjustment of the lens can be easily achieved by considering only the number of divisions. Now, it is possible to configure the circuit with only a certain number of divisions without using the division number switching circuit 28, but
When considering the responsiveness of the lens drive and the ability to follow changes in the subject, it is possible to achieve better results by using this circuit. In this embodiment, the switching is performed in the 2flI class, but the same applies to the case of a plurality of switching.
また、従来の小型直流モータでは位置決め制御をする為
に位置センサが必要となる為、これらの性能により制御
性能が左右される事が多かったが、しかし、今回のシス
テムに於いては全く不要であり、制御性能の変動要因が
少な（なる分、性能向上すると言える。同時に、小型直
流モータの場合、モータの回転数を制御する事は容易で
ないため、今迄の場合、レンズ鏡筒のもつ共振周波数を
はずしてレンズを動かす事が出来なかったが、今回の場
合あらかじめレンズ鏡筒の共振周波数から、づらしてレ
ンズ駆動させる事も可能となる為、今迄使用してきた防
振材料や各種の防振構造も不要となり、大幅な軽量化、
設計の自由化、コストダウン化も図る事が可能となる。In addition, conventional small DC motors require position sensors for positioning control, and the performance of these sensors often affects the control performance, but this system does not require them at all. This means that there are fewer factors that can cause fluctuations in control performance (so it can be said that performance is improved).At the same time, in the case of a small DC motor, it is not easy to control the motor rotation speed, so in the case of the current case, the resonance of the lens barrel It was not possible to move the lens by shifting the frequency, but in this case it is possible to drive the lens by shifting the resonance frequency of the lens barrel in advance, so it is possible to move the lens by shifting the resonance frequency of the lens barrel. There is no need for a vibration structure, resulting in a significant weight reduction.
It also becomes possible to achieve design freedom and cost reduction.
発明の効果
以上の様に本発明は、レンズ部を駆動する駆動源にステ
ッピングモータを用い、それを分割数可変の電流制御型
の多分割駆動方式で動かす事により、レンズ移動を微細
調整可能とし、また、制御性能も簡素化された回路で、
しかも、センサを用いずに向上させる事が可能である。Effects of the Invention As described above, the present invention uses a stepping motor as a drive source for driving the lens section, and moves it using a current-controlled multi-division drive system in which the number of divisions is variable, thereby making it possible to finely adjust lens movement. , In addition, the control performance is also simplified by the circuit,
Furthermore, it is possible to improve the performance without using a sensor.
同時にレンズ鏡筒の有する剛性の強弱からなる共振周波
数からはずしてステッピングモータを駆動する事により
、容易に低振動化をする事ができ、設計自由度が増し、
安価とする事が出来る。At the same time, by driving the stepping motor at a resonance frequency that is determined by the rigidity of the lens barrel, vibration can be easily reduced, increasing the degree of design freedom.
It can be made inexpensive.
第１図は、本発明の実施例におけるレンズ鏡筒で
のレンズ駆動方法を示す構成図、第２図は亭→→の制御
方法を示すブロック図、第３図、第４図は多分割駆動方
式を用いたモータ電流波形図、第５図は従来例を示すレ
ンズ鏡筒のレンズ駆動方法を芝
示す構成図、第６図は）÷→の制御方法を示すブロック
図である。
１１・・・・・・ステッピングモータ、１２・・・・・
・レンズ部、１３・・・・・・駆動ギヤ、１４・・・・
・・レンズ鏡筒本体、２６・・・・・・電流制御型多分
割駆動回路、２８・・・・・・分割数切替回路、５１・
・・・・・小型直流モータ、５３・・・・・・駆動ギヤ
、５５・・・・・・位置センサ、６６・・・・・・駆動
回路、６７・・・・・・誤差アンプ。Fig. 1 is a block diagram showing the lens driving method in the lens barrel in an embodiment of the present invention, Fig. 2 is a block diagram showing the control method for the bow →→, and Figs. 3 and 4 are multi-division driving. FIG. 5 is a block diagram showing a conventional method for driving a lens barrel of a lens barrel, and FIG. 6 is a block diagram showing a control method for )÷→. 11...Stepping motor, 12...
・Lens part, 13... Drive gear, 14...
... Lens barrel body, 26 ... Current control type multi-division drive circuit, 28 ... Division number switching circuit, 51.
...Small DC motor, 53 ... Drive gear, 55 ... Position sensor, 66 ... Drive circuit, 67 ... Error amplifier.
Claims (1)
とし、そのレンズ部を移動停止させるレンズ鏡筒に於い
てレンズ部の駆動源をステッピングモータとし、前記ス
テッピングモータの励磁方式に電流制御型の多分割駆動
方式を用いるレンズ鏡筒のレンズ駆動方法。（２）前記
レンズ部の移動距離範囲により、電流制御型の多分割駆
動方式の分割数を可変とする分割数切替回路を設け、分
割数をかえる請求項１記載のレンズ鏡筒のレンズ駆動方
法。 （３）前記レンズ鏡筒の固有振動周波数と、ステッピン
グモータの駆動周波数が同一或いは、近似とならぬ様に
駆動周波数を決定し、レンズ鏡筒の振動を抑制する事を
特徴とする請求項１記載のレンズ鏡筒のレンズ駆動方法
。[Scope of Claims] (1) In a lens barrel that has a plurality of lenses and has a movable lens section, and that stops moving the lens section, a stepping motor is used as a drive source for the lens section, and the stepping motor A lens drive method for a lens barrel that uses a current-controlled multi-division drive method as the motor excitation method. (2) The method for driving a lens barrel of a lens barrel according to claim 1, wherein a division number switching circuit is provided to change the number of divisions of the current-controlled multi-division drive system depending on the moving distance range of the lens portion, and the number of divisions is changed. . (3) The driving frequency is determined so that the natural vibration frequency of the lens barrel and the driving frequency of the stepping motor are not the same or approximate, and vibration of the lens barrel is suppressed. The lens driving method of the lens barrel described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2541090A JPH03230110A (en) | 1990-02-05 | 1990-02-05 | Lens driving method for lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2541090A JPH03230110A (en) | 1990-02-05 | 1990-02-05 | Lens driving method for lens barrel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03230110A true JPH03230110A (en) | 1991-10-14 |
Family
ID=12165154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2541090A Pending JPH03230110A (en) | 1990-02-05 | 1990-02-05 | Lens driving method for lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03230110A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009169010A (en) * | 2008-01-15 | 2009-07-30 | Panasonic Corp | Imaging device, portable terminal and af control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60151606A (en) * | 1984-01-19 | 1985-08-09 | Canon Inc | Motor changeable to step driving and brushless driving and lens barrel containing said motor |
| JPH01265215A (en) * | 1988-04-18 | 1989-10-23 | Hitachi Ltd | Automatic focusing device for video camera |
| JPH02178640A (en) * | 1988-12-29 | 1990-07-11 | Seikosha Co Ltd | Step motor for camera |
-
1990
- 1990-02-05 JP JP2541090A patent/JPH03230110A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60151606A (en) * | 1984-01-19 | 1985-08-09 | Canon Inc | Motor changeable to step driving and brushless driving and lens barrel containing said motor |
| JPH01265215A (en) * | 1988-04-18 | 1989-10-23 | Hitachi Ltd | Automatic focusing device for video camera |
| JPH02178640A (en) * | 1988-12-29 | 1990-07-11 | Seikosha Co Ltd | Step motor for camera |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009169010A (en) * | 2008-01-15 | 2009-07-30 | Panasonic Corp | Imaging device, portable terminal and af control method |
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