JPH0246329B2 - - Google Patents
Info
- Publication number
- JPH0246329B2 JPH0246329B2 JP57181923A JP18192382A JPH0246329B2 JP H0246329 B2 JPH0246329 B2 JP H0246329B2 JP 57181923 A JP57181923 A JP 57181923A JP 18192382 A JP18192382 A JP 18192382A JP H0246329 B2 JPH0246329 B2 JP H0246329B2
- Authority
- JP
- Japan
- Prior art keywords
- ball
- cylinder
- inner cylinder
- thread groove
- wrapping
- 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.)
- Expired - Lifetime
Links
- 230000007246 mechanism Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Lens Barrels (AREA)
Description
【発明の詳細な説明】
本発明は、ボールネジ機構の組立方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of assembling a ball screw mechanism.
ボールネジ機構は、外周面にネジ溝を有する内
筒と、内周面にネジ溝を有する外筒と、内筒のネ
ジ溝と外筒のネジ溝とに係合するボールと、この
ボールを保持するボール保持筒と、から概略構成
され、内筒と外筒との何れか一方を回転させるこ
とにより、回転運動を滑らかな直線運動に変換さ
せる機能を有している。 The ball screw mechanism includes an inner cylinder having a thread groove on its outer circumferential surface, an outer cylinder having a thread groove on its inner circumferential surface, a ball that engages with the thread groove of the inner cylinder and the thread groove of the outer cylinder, and holding this ball. The ball holding cylinder has a function of converting rotational movement into smooth linear movement by rotating either the inner cylinder or the outer cylinder.
従来のボールネジ機構のネジ溝は、切削加工に
より形成され、そのボールネジ機構の組立方法
は、互いに対向する内筒、外筒のネジ溝間にボー
ルを介装するものであるが、切削によりネジ溝の
寸法精度はせいぜい0.01mmないし0.03mm程度が限
度である。 The thread grooves of conventional ball screw mechanisms are formed by cutting, and the method of assembling the ball screw mechanism is to insert balls between the thread grooves of the inner cylinder and outer cylinder, which face each other. The dimensional accuracy is limited to about 0.01mm to 0.03mm at most.
ところで、たとえば、ビデオカメラのオートフ
オーカス用レンズの繰出機構等においては、軽い
駆動トルクと長寿命が要求され、ガタがなく、か
つ、スムーズな回転を確保するためには、ボール
と両ネジ溝の間の隙間が0.005mmないし0.010mm程
度の寸法値となることを必要とする。 By the way, for example, the feeding mechanism of the autofocus lens of a video camera requires light driving torque and long life, and in order to ensure smooth rotation without play, it is necessary to use a ball and both screw grooves. It is necessary that the gap between them be approximately 0.005mm to 0.010mm.
本発明は、この点に鑑みてなされたもので、そ
の目的は、寸法精度の向上を図つたボールネジ機
構の組立方法を提供することにある。 The present invention has been made in view of this point, and an object thereof is to provide a method for assembling a ball screw mechanism that improves dimensional accuracy.
本発明のボールネジ機構の組立方法の特徴は、
組み込まれるべきボールよりも若干大径のラツピ
ング用ボールを組み込み、内筒と外筒とを強制回
転させて、ネジ溝をこのラツピング用ボールにな
らわせるようにしたところにある。 The features of the ball screw mechanism assembly method of the present invention are as follows:
A wrapping ball with a slightly larger diameter than the ball to be installed is installed, and the inner and outer cylinders are forced to rotate so that the thread groove is aligned with the wrapping ball.
以下に本発明の実施例を図面に基づいて説明す
る。 Embodiments of the present invention will be described below based on the drawings.
第１図ないし第２０図は、本発明をビデオカメ
ラのリヤフオーカス型のオートフオーカシングレ
ンズの繰出し機構に適用した本発明の一実施を示
すもので、１はマスタホルダ圧入ケース、２はマ
スタ筒で、マスタホルダ圧入ケース１とマスタ筒
２とはナベ小ネジ３によつて一体に結合されてい
る。マスタ筒２の内側には外筒４が固定して配設
されている。外筒４は第３図に示すようにギヤー
用窓孔５を有し、外筒４の内周面にはネジ溝６が
形成されている。ネジ溝６の断面形状は第５図に
示すように等脚台形とされ、ネジ溝６の底面と左
右の斜面とがなす角度はほぼ角120度とされてい
る。 Figures 1 to 20 show an embodiment of the present invention in which the present invention is applied to a feeding mechanism for a rear focusing type autofocusing lens of a video camera, in which 1 is a master holder press-fit case, 2 is a master cylinder. The master holder press-fit case 1 and the master cylinder 2 are integrally connected by a pan head machine screw 3. An outer cylinder 4 is fixedly disposed inside the master cylinder 2. The outer cylinder 4 has a gear window hole 5 as shown in FIG. 3, and a threaded groove 6 is formed on the inner peripheral surface of the outer cylinder 4. The cross-sectional shape of the thread groove 6 is an isosceles trapezoid as shown in FIG. 5, and the angle between the bottom surface of the thread groove 6 and the left and right slopes is approximately 120 degrees.
７は内筒で、内筒７は外筒４の内側にこの外筒
４に対して相対回転可能に配設され（第２図参
照）、第６図に示すように内筒７の外周面にはネ
ジ溝８が形成されている。ネジ溝８の断面形状は
第８図に示すように等脚台形とされ、ネジ溝８の
底面と左右の斜面とがなす角度はほぼ角120度と
されている。内筒７の軸方向の略中央部にはネジ
孔９が形成され、このネジ孔９にはストツパネジ
１０が固定して設けられている。内筒７の内側に
はレンズスペーサ１１を介してリヤ型オートフオ
ーカス用レンズ群１２が固定されている。内筒７
の第１図中左方側すなわち至近距離合焦位置側の
端部にはリングギヤー１３が一体に固定され、リ
ングギヤー１３は外筒４の外側に設けられた駆動
ギヤー１４に噛み合つている。 Reference numeral 7 denotes an inner cylinder, and the inner cylinder 7 is arranged inside the outer cylinder 4 so as to be able to rotate relative to the outer cylinder 4 (see Fig. 2). A thread groove 8 is formed in. The cross-sectional shape of the thread groove 8 is an isosceles trapezoid as shown in FIG. 8, and the angle between the bottom surface of the thread groove 8 and the left and right slopes is approximately 120 degrees. A screw hole 9 is formed approximately at the center of the inner cylinder 7 in the axial direction, and a stopper screw 10 is fixedly provided in the screw hole 9. A rear autofocus lens group 12 is fixed inside the inner cylinder 7 via a lens spacer 11. Inner cylinder 7
A ring gear 13 is integrally fixed to the left side in FIG. .
内筒７と外筒４との間にはボール保持筒１５が
装着され、ボール保持筒１５には第１３図に示す
ようにその周回り方向に等間隔をあけて奇数箇
所、ここでは５箇所だけボール孔１６が形成さ
れ、ボール孔１６はボール保持筒１５の軸方向に
適当間隔をあけて２列並んで配列されている。ボ
ール保持筒１５にはネジ溝６，８の延びる方向と
同方向に延びて長孔１７が形成されている。長孔
１７内にはストツパネジ１０が長孔１７の端面に
当接可能に突出して臨んでいる。 A ball holding cylinder 15 is installed between the inner cylinder 7 and the outer cylinder 4, and as shown in FIG. The ball holes 16 are arranged in two rows at appropriate intervals in the axial direction of the ball holding cylinder 15. A long hole 17 is formed in the ball holding cylinder 15 and extends in the same direction as the thread grooves 6 and 8. A stopper screw 10 protrudes and faces into the elongated hole 17 so as to be able to come into contact with the end surface of the elongated hole 17.
ボール保持筒１５のボール孔１６にはボール１
８が保持され、ボール１８は外筒４のネジ溝６と
内筒７のネジ溝８とに同時に係合している。この
ボール１８はプラスチツク製であつて、第５図、
第８図に示すようにネジ溝６，８に対してボール
１８はその周回り方向に等間隔をあけて６点当接
し、ボール１８の隣合う２つの当接点間の円弧の
中心角はほぼ角60度とされている。ボール１８と
ネジ溝６，８との径方向、軸方向の隙間は0.005
mmから0.010mmの範囲の寸法値とされている。こ
こで言う径方向および軸方向とは、ボール保持筒
１５の径方向および軸方向を言う。 The ball 1 is inserted into the ball hole 16 of the ball holding cylinder 15.
8 is held, and the ball 18 is engaged with the thread groove 6 of the outer cylinder 4 and the thread groove 8 of the inner cylinder 7 at the same time. This ball 18 is made of plastic and is shown in FIG.
As shown in FIG. 8, the ball 18 contacts the screw grooves 6 and 8 at six points at equal intervals in the circumferential direction, and the central angle of the arc between the two adjacent contact points of the ball 18 is approximately The angle is said to be 60 degrees. The radial and axial clearance between the ball 18 and the screw grooves 6 and 8 is 0.005.
Dimensions range from mm to 0.010 mm. The radial direction and axial direction herein refer to the radial direction and axial direction of the ball holding cylinder 15.
ボール保持筒１５の第２図中右方側すなわち無
限大合焦位置側にはボール保持筒１５の脱落を防
止するストツパリング１９が内筒７と外筒４との
間に装着されている。２０はこのストツパリング
１９を押圧保持する押えリング、２１は皿小ネジ
２２を介してマスタ筒２の無限大合焦位置側に結
合されたセンサホルダ筒である。 A stop ring 19 for preventing the ball holding cylinder 15 from falling off is attached between the inner cylinder 7 and the outer cylinder 4 on the right side of the ball holding cylinder 15 in FIG. 2, that is, on the infinity focus position side. Reference numeral 20 designates a presser ring that presses and holds this stopper ring 19, and 21 designates a sensor holder cylinder connected to the infinity focus position side of the master cylinder 2 via a countersunk head screw 22.
２３は固定筒で、固定筒２３は外筒４の至近距
離合焦位置側の端部に固定して装着されている。
固定筒２３にはレンズスペーサ２４を介してレン
ズ群２５が固定されている。この固定筒２３の無
限大合焦位置側の端面にはリングギヤー１３の一
端面が当接可能とされ、リングギヤー１３が固定
筒２３に当接することにより内筒７の至近距離合
焦位置側の終端位置が規されるようになつてい
る。 23 is a fixed barrel, and the fixed barrel 23 is fixedly attached to the end of the outer barrel 4 on the close-range focusing position side.
A lens group 25 is fixed to the fixed barrel 23 via a lens spacer 24. One end surface of the ring gear 13 can come into contact with the end surface of the fixed barrel 23 on the infinity focus position side, and when the ring gear 13 comes into contact with the fixed barrel 23, the inner barrel 7 is closer to the close focus position. The terminal position of is defined.
第１６図は前述のマスタホルダ圧入ケース１を
示すもので、マスタホルダ圧入ケース１にはゴム
座２６を介してスペーサ付ネジ２７によつてステ
ツピングモータ２８が固定されている。ステツピ
ングモータ２８の出力軸端部には小ギヤー２９が
形成され、小ギヤー２９は中間ギヤー３０に噛み
合つており、この中間ギヤー３０は前述の駆動ギ
ヤー１４に噛み合つている。３１はステツピング
モータ２８と入力信号源（図示を略す。）とを接
続するリード線、３２はリード線３１を保護する
保護板、３３はリード線３１とマスタホルダ圧入
ケース１との間に介装されたモルトプレンであ
る。 FIG. 16 shows the master holder press-fit case 1 described above, and a stepping motor 28 is fixed to the master holder press-fit case 1 via a rubber seat 26 with a screw 27 with a spacer. A small gear 29 is formed at the end of the output shaft of the stepping motor 28, and the small gear 29 meshes with an intermediate gear 30, which in turn meshes with the aforementioned drive gear 14. 31 is a lead wire that connects the stepping motor 28 and an input signal source (not shown); 32 is a protection plate that protects the lead wire 31; and 33 is a wire that is interposed between the lead wire 31 and the master holder press-fit case 1. It is a maltprene that has been packaged.
次に作用について説明する。 Next, the effect will be explained.
入力信号源からリード線３１を介して第１７図
に示す波形の入力信号がステツピングモータ２８
に入力されると、ステツピングモータ２８は一方
向に回転し、この回転出力は中間ギヤー３０、駆
動ギヤー１４を介してリングギヤー１３に伝動さ
れ内筒７が回転駆動される。内筒７が回転駆動さ
れると、内筒７は無限大合焦位置側に移動し、つ
いでステツピングモータ２８に停止信号が入力さ
れると、内筒７は自動的に移動停止しレンズ群１
２の焦点合せが自動的に行なわれる。 An input signal having the waveform shown in FIG. 17 is sent from the input signal source via the lead wire 31 to the stepping motor 28.
, the stepping motor 28 rotates in one direction, and this rotational output is transmitted to the ring gear 13 via the intermediate gear 30 and the drive gear 14, and the inner cylinder 7 is rotationally driven. When the inner cylinder 7 is rotationally driven, the inner cylinder 7 moves to the infinity focus position. Then, when a stop signal is input to the stepping motor 28, the inner cylinder 7 automatically stops moving and the lens group 1
2 focusing is performed automatically.
逆に、第１８図に示す波形の入力信号がステツ
ピングモータ２８に入力されると、ステツピング
モータ２８は他方向に回転して内筒７が至近距離
合焦位置に移動することによりレンズ群１２の焦
点合せが自動的に行なわれる。 Conversely, when the input signal having the waveform shown in FIG. 18 is input to the stepping motor 28, the stepping motor 28 rotates in the other direction and moves the inner cylinder 7 to the close focusing position, thereby focusing the lens group. 12 focusing is done automatically.
次に本発明に係るボールネジ機構の組立方法に
ついて説明する。 Next, a method for assembling the ball screw mechanism according to the present invention will be explained.
先ず、内筒７の外周面にネジ溝８を形成すると
ともに外筒４の内周面にネジ溝６を切削する。こ
の場合、ネジ溝６，８の断面形状は等脚台形であ
つて、ネジ溝６，８の底面とこの両側の斜面とが
なす角度はほぼ角120度に設定して形成されるこ
と勿論である。後述するラツピング加工を容易に
するために、内筒７のネジ溝６と外筒４のネジ溝
６とに硬質アルマイト皮膜t1を形成し、この硬質
アルマイト皮膜t1の表面上にフツ素系塗料、カー
ボン系塗料などを焼付け塗装して滑らかな塗装面
t2を形成するとよい（第２１図参照）。 First, a thread groove 8 is formed on the outer peripheral surface of the inner cylinder 7, and a thread groove 6 is cut on the inner peripheral surface of the outer cylinder 4. In this case, the cross-sectional shape of the thread grooves 6 and 8 is an isosceles trapezoid, and it goes without saying that the angle between the bottom surface of the thread grooves 6 and 8 and the slopes on both sides thereof is approximately 120 degrees. be. In order to facilitate the wrapping process described later, a hard alumite film t1 is formed on the thread groove 6 of the inner cylinder 7 and the thread groove 6 of the outer cylinder 4, and a fluorine-based film is formed on the surface of this hard alumite film t1 . Smooth painted surface by baking paint, carbon-based paint, etc.
It is best to form t 2 (see Figure 21).
ついで、内筒７と外筒４との間にボール保持筒
１５を装着するとともにボール保持筒１５に形成
されたボール孔１６にはラツピング加工用ボール
１８′を保持させ、このラツピング加工用ボール
１８′は内筒４のネジ溝８と外筒４のネジ溝６と
にきつめに係合するように保持する。 Next, a ball holding cylinder 15 is installed between the inner cylinder 7 and the outer cylinder 4, and the ball hole 16 formed in the ball holding cylinder 15 holds a wrapping ball 18'. ' is held so as to tightly engage the thread groove 8 of the inner cylinder 4 and the thread groove 6 of the outer cylinder 4.
ラツピング加工用ボール１８′をボール孔１６
に保持させた状態でラツプ剤を使用しながら内筒
７と外筒４とを相対的に強制回転させることによ
り、前記塗装面t2がラツピング加工され、この場
合、ネジ溝６，８の底面、斜面は厳密に言うと、
第２１図に示すように微小な部分凹球面に形成さ
れる。ラツピング加工仕上げ後、ラツピング加工
用ボール１８′の代わりにボール１８をボール孔
１６に入れ替えて保持せしめて組立完了する。 The wrapping ball 18' is inserted into the ball hole 16.
By forcibly rotating the inner cylinder 7 and the outer cylinder 4 relative to each other while holding them in place using a wrapping agent, the painted surface t2 is wrapped.In this case, the bottom surface of the thread grooves 6 and 8 , strictly speaking, the slope is
As shown in FIG. 21, it is formed into a minute partially concave spherical surface. After finishing the wrapping process, the ball 18 is replaced with the wrapping ball 18' and held in the ball hole 16, and the assembly is completed.
なお、ボール１８の径はラツピング加工用ボー
ル１８′の径よりも0.005mmから0.010mm程度小径
のものであつて、かつ、ボール１８の硬さはラツ
ピング加工用ボール１８の硬さよりも軟らかい材
質のものが好ましく、ここでは滑り抵抗の小さい
プラスチツク製のものが使用されている。勿論、
ボール１８の材料はプラスチツクに限定されるも
のではなく、要はラツピング加工用ボール１８′
よりも軟質の材料が好ましく、金属、非金属を問
わない。 The diameter of the ball 18 is about 0.005 mm to 0.010 mm smaller than the diameter of the wrapping ball 18', and the hardness of the ball 18 is made of a softer material than the wrapping ball 18'. A material made of plastic, which has low slip resistance, is preferably used. Of course,
The material of the ball 18 is not limited to plastic, but the ball 18' is used for wrapping.
It is preferable to use a material that is softer than the metal, and it does not matter if it is a metal or a non-metal.
このように、内筒７のネジ溝８と外筒４のネジ
溝６とに塗装を施した後に、この塗装面t2をラツ
ピング加工することにより、ボール１８が当接す
るネジ溝６，８の面がボール１８の球面に沿つた
部分凹球面に形成され、切削時におけるネジ溝
６，８の微小なピツチ寸法誤差が吸収除去されて
ボール１８とネジ溝６，８との径方向、軸方向の
隙間が0.005mmないし0.010mm程度の寸法値に加工
されることとなる。この場合、ラツピング加工用
ボール１８′の径の大きさとラツピング回数とを
加減することにより、ボール１８とネジ溝６，８
との間の径方向ないし軸方向の隙間を0.005mmか
ら0.010mmの範囲の所望の寸法値に容易に設定で
きること勿論である。 In this way, after coating the thread grooves 8 of the inner cylinder 7 and the thread grooves 6 of the outer cylinder 4, by wrapping the painted surface t2, the thread grooves 6 and 8 that the ball 18 comes into contact with are The surface is formed into a partially concave spherical surface along the spherical surface of the ball 18, and the minute pitch dimensional error of the thread grooves 6, 8 during cutting is absorbed and removed, and the ball 18 and the thread grooves 6, 8 are formed in the radial and axial directions. The gap will be processed to a dimension value of about 0.005mm to 0.010mm. In this case, by adjusting the diameter of the wrapping ball 18' and the number of times of wrapping, the ball 18 and the thread grooves 6, 8
Of course, the radial or axial clearance between the two can be easily set to a desired dimension value in the range of 0.005 mm to 0.010 mm.
なお、ボールネジ機構の作動回数が累積して増
大すると、ボール１８がネジ溝６，８に対して位
相ズレを起こすが、このとき内筒７に固設したス
トツパネジ１０がボール保持筒１５を強制的に押
え込むために、ボール１８が摩擦回転ではなく滑
り移動することにより位相ズレを防止する。ボー
ル１８が滑り移動する際、ボール１８は滑り抵抗
の小さいプラスチツク製であるので、ステツピン
グモータ２８の駆動トルクがその分だけ小さく済
むこととなる。 Note that as the number of operations of the ball screw mechanism increases cumulatively, the ball 18 causes a phase shift with respect to the thread grooves 6 and 8, but at this time, the stopper screw 10 fixed to the inner cylinder 7 forcibly moves the ball holding cylinder 15. In order to press the ball 18 down, the ball 18 slides rather than rotates by friction, thereby preventing a phase shift. When the ball 18 slides, since the ball 18 is made of plastic with low sliding resistance, the driving torque of the stepping motor 28 can be reduced accordingly.
第２２図は本発明の他の実施例を示すもので、
その特徴は、本発明に係るボールネジ機構を、前
玉レンズが駆動されることによりフオーカシング
を行うようにした前玉方式のビデオカメラの合焦
装置のレンズ鏡筒に適用した例を示すもので、こ
の図において、３４は主鏡筒としての内筒、３５
は距離環としての外筒であつて、外筒３５は前玉
レンズ群３６を保持しており、内筒３４に対して
外筒３５は相対回転可能に設けられている。３７
はステツピングモータのシヤフト、３８はその出
力ギヤーで、外筒３５はシヤフト３７に近い側の
周面に一周してギヤー部３９を有しており、ギヤ
ー部３９は出力ギヤー３８に噛み合つている。こ
の出力ギヤー３８によつて前玉レンズ群３６が駆
動されることによりフオーカシングが行なわれる
ようになつている。 FIG. 22 shows another embodiment of the present invention,
The feature is that the ball screw mechanism according to the present invention is applied to a lens barrel of a focusing device of a front lens type video camera in which focusing is performed by driving the front lens. In this figure, 34 is an inner barrel as the main lens barrel, 35
is an outer cylinder as a distance ring, and the outer cylinder 35 holds a front lens group 36, and the outer cylinder 35 is provided so as to be rotatable relative to the inner cylinder 34. 37
38 is the shaft of the stepping motor, and 38 is its output gear. The outer cylinder 35 has a gear part 39 around the circumference on the side near the shaft 37, and the gear part 39 meshes with the output gear 38. There is. Focusing is performed by driving the front lens group 36 by the output gear 38.
本発明に係るボールネジ機構は上記合焦系に適
用されており、４０，４１はネジ溝、４２はボー
ル、４３はボール孔４４を有するボール保持筒で
ある。その他、４５はズーミング系、４６はバリ
エータレンズ群、４７はコンペンセータレンズ、
４８はガイド棒、４９はカム筒、５０は操作つま
みであつて、操作つまみ５０がマニユアル操作さ
れることにより、バリエータレンズ群４６および
コンペンセータレンズ４７が駆動されてズーミン
グが行なわれるようになつている。なお、本実施
例の作用については前記実施例と同様であるの
で、その説明を省略する。本実施例に係るボール
ネジ機構の組立方法についても前記実施例と概ね
同様であるので、その説明を省略する。 The ball screw mechanism according to the present invention is applied to the above-mentioned focusing system, and 40 and 41 are screw grooves, 42 is a ball, and 43 is a ball holding cylinder having a ball hole 44. In addition, 45 is a zooming system, 46 is a variator lens group, 47 is a compensator lens,
48 is a guide rod, 49 is a cam barrel, and 50 is an operating knob. When the operating knob 50 is manually operated, the variator lens group 46 and the compensator lens 47 are driven to perform zooming. . Note that the operation of this embodiment is the same as that of the previous embodiment, so the explanation thereof will be omitted. The method of assembling the ball screw mechanism according to this embodiment is also generally the same as that of the previous embodiment, so the explanation thereof will be omitted.
以上説明したように、本発明のボールネジ機構
の組立方法によれば、内筒のネジ溝と外筒のネジ
溝との間に、本来入いるべきボールに代えてこの
ボールより僅かに大きなラツピング加工用ボール
を装着してラツピングを施したので、ラツピング
加工用ボールの径の大きさとラツピング回数を加
減することにより、ボールとネジ溝との間の隙間
を従来に増して精度良く容易に形成させることが
でき、内筒と外筒とがガタなく、かつ、スムーズ
に回転させることができるという効果を奏する。 As explained above, according to the method for assembling a ball screw mechanism of the present invention, a wrapping process is performed between the thread groove of the inner cylinder and the thread groove of the outer cylinder, which is slightly larger than the ball, instead of the ball that should originally be inserted. By adjusting the diameter of the wrapping ball and the number of times of wrapping, the gap between the ball and the thread groove can be formed more accurately and easily than before. This has the effect that the inner cylinder and the outer cylinder can be rotated smoothly without any play.
第１図は本発明の一実施例を示す一部を破断し
た断面図、第２図は第１図のものの要部を拡大し
た拡大断面図、第３図は本発明に係る外筒を示す
縦断面図、第４図は第３図のＸ−Ｘ線に沿つた横
断面図、第５図は本発明に係る外筒のネジ溝とボ
ールとの係合状態を示す拡大断面図、第６図は本
発明に係る内筒を示す縦断面図、第７図は本発明
に係る内筒の側面図、第８図は本発明に係る内筒
のネジ溝とボールとの係合状態を示す拡大断面
図、第９図は本発明に係る内筒に形成されたネジ
孔を示す拡大断面図、第１０図は本発明に係るリ
ングギヤーを示す正面図、第１１図は第１０図の
Ｙ−Ｙ線に沿つた断面図、第１２図は本発明に係
るリングギヤーと内筒を示す断面図、第１３図は
本発明に係るボール保持筒を示す正面図、第１４
図は第１３図の一部を破断した側面図、第１５図
は本発明に係るボール保持筒を示す展開図、第１
６図は本発明に係るマスタホルダ圧入ケースを示
す正面図、第１７図は本発明に係る内筒を無限大
合焦位置側に移動させる入力信号波形を示す波形
図、第１８図は本発明に係る内筒を至近距離合焦
位置側に移動させる入力信号波形を示す波形図、
第１９図は内筒を回転駆動させたときにおけるボ
ールとネジ溝との係合状態を示す断面図、第２０
図は本発明の一実施例を示す要部分解斜視図、第
２１図は本発明に係るラツピング加工時のネジ溝
を示す断面図、第２２図は本発明の他の実施例を
示す組立半断面図である。
４，３５……外筒、６，４２……ネジ溝（外
筒）、７，３４……内筒、８，４１……ネジ溝
（内筒）、１５，４３……ボール保持筒、１６，４
４……ボール孔、１８，４２……ボール、１８′
……ラツピング加工用ボール、t1……硬質アルマ
イト皮膜、t2……塗装面。
Fig. 1 is a partially broken sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 shows an outer cylinder according to the present invention. 4 is a cross-sectional view taken along the line X-X in FIG. 3; FIG. 5 is an enlarged sectional view showing the state of engagement between the threaded groove of the outer cylinder and the ball according to the present invention; FIG. 6 is a longitudinal sectional view showing the inner cylinder according to the present invention, FIG. 7 is a side view of the inner cylinder according to the present invention, and FIG. 8 is a diagram showing the state of engagement between the thread groove and the ball of the inner cylinder according to the present invention. 9 is an enlarged sectional view showing the screw hole formed in the inner cylinder according to the present invention, FIG. 10 is a front view showing the ring gear according to the present invention, and FIG. 11 is the same as that shown in FIG. 12 is a sectional view taken along the Y-Y line, FIG. 12 is a sectional view showing a ring gear and an inner cylinder according to the present invention, FIG. 13 is a front view showing a ball holding cylinder according to the present invention, and FIG.
The figure is a partially cutaway side view of FIG. 13, FIG. 15 is a developed view showing the ball holding cylinder according to the present invention, and FIG.
6 is a front view showing a master holder press-fit case according to the present invention, FIG. 17 is a waveform diagram showing an input signal waveform for moving the inner cylinder toward the infinity focus position according to the present invention, and FIG. 18 is a waveform diagram showing the input signal waveform according to the present invention. A waveform diagram showing an input signal waveform for moving the inner cylinder to the close-range focusing position side,
FIG. 19 is a sectional view showing the state of engagement between the ball and the thread groove when the inner cylinder is driven to rotate;
Figure 21 is an exploded perspective view of essential parts showing one embodiment of the present invention, Figure 21 is a sectional view showing thread grooves during wrapping processing according to the present invention, and Figure 22 is an assembled half showing another embodiment of the present invention. FIG. 4, 35... Outer cylinder, 6, 42... Thread groove (outer cylinder), 7, 34... Inner cylinder, 8, 41... Thread groove (inner cylinder), 15, 43... Ball holding cylinder, 16 ,4
4... Ball hole, 18, 42... Ball, 18'
... Ball for wrapping, t 1 ... Hard alumite film, t 2 ... Painted surface.
Claims (1)
筒の内周面にネジ溝を形成し、前記内筒と前記外
筒との間にはボール孔が形成されたボール保持筒
を装着すると共に、前記ボール孔には、前記内筒
のネジ溝から前記外筒のネジ溝までの間にきつめ
に係合する大きさのラツピング加工用ボールを保
持させ、前記内筒と前記外筒とを相対的に強制回
転させて前記内筒のネジ溝と前記外筒のネジ溝と
をラツピング加工仕上げした後に、前記ラツピン
グ加工用ボールに代えて前記ラツピング加工用ボ
ールよりも僅かに小径のボールを前記ボール孔に
入れ替えて保持させてなるボールネジ機構の組立
方法。1. A thread groove is formed on the outer peripheral surface of the inner cylinder, a thread groove is formed on the inner peripheral surface of the outer cylinder, and a ball holding cylinder with a ball hole formed is installed between the inner cylinder and the outer cylinder. At the same time, the ball hole holds a wrapping ball of a size that tightly engages between the thread groove of the inner cylinder and the thread groove of the outer cylinder, so that the inner cylinder and the outer cylinder are connected. After wrapping the thread grooves of the inner cylinder and the thread groove of the outer cylinder by forcing them to rotate relatively, replace the wrapping ball with a ball having a slightly smaller diameter than the wrapping ball. A method of assembling a ball screw mechanism in which the ball screw mechanism is replaced and held in the ball hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57181923A JPS59142026A (en) | 1982-10-16 | 1982-10-16 | Method for assembling ball screw mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57181923A JPS59142026A (en) | 1982-10-16 | 1982-10-16 | Method for assembling ball screw mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59142026A JPS59142026A (en) | 1984-08-15 |
| JPH0246329B2 true JPH0246329B2 (en) | 1990-10-15 |
Family
ID=16109264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57181923A Granted JPS59142026A (en) | 1982-10-16 | 1982-10-16 | Method for assembling ball screw mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59142026A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008287034A (en) * | 2007-05-17 | 2008-11-27 | Sharp Corp | Actuator, manufacturing method thereof, imaging device, and portable electronic device |
| CN110261983B (en) * | 2019-06-04 | 2021-09-03 | 贵州倍易通科技有限公司 | Driving device for camera lens |
-
1982
- 1982-10-16 JP JP57181923A patent/JPS59142026A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59142026A (en) | 1984-08-15 |
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