JPH11202182A - Clutch mechanism for lens barrel - Google Patents

Clutch mechanism for lens barrel

Info

Publication number
JPH11202182A
JPH11202182A JP1313698A JP1313698A JPH11202182A JP H11202182 A JPH11202182 A JP H11202182A JP 1313698 A JP1313698 A JP 1313698A JP 1313698 A JP1313698 A JP 1313698A JP H11202182 A JPH11202182 A JP H11202182A
Authority
JP
Japan
Prior art keywords
motor
lens barrel
clutch mechanism
distance
gear
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
Application number
JP1313698A
Other languages
Japanese (ja)
Other versions
JP3737266B2 (en
Inventor
Masaru Yamamoto
勝 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sigma Corp
Original Assignee
Sigma Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sigma Corp filed Critical Sigma Corp
Priority to JP01313698A priority Critical patent/JP3737266B2/en
Publication of JPH11202182A publication Critical patent/JPH11202182A/en
Application granted granted Critical
Publication of JP3737266B2 publication Critical patent/JP3737266B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Lens Barrels (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive high-quality AF lens barrel where a distance adjusting barrel can be manually adjusted without requiring manual switching operation and which can be always adjusted by providing a clutch mechanism connected to a motor only when the rotational power of the motor is applied at the time of automatic focusing so as to transmit the power of the motor to the distance adjusting barrel. SOLUTION: This automatically acting clutch mechanism 11 is provided between the motor 12, and a pinion 9a and a reduction gear train 9b to 9d which are a transmission mechanism, so that the switching operation between connection and interruption need not be performed severally at the time of manually adjusting a distance. Therefore, even when manual power is applied to a manual adjusting barrel 6 and transmitted to the motor 12 side in a reverse direction, it is not transmitted to the motor 12 side but makes a clutch shaft 10 idly rotate from the pinion 9a. Namely, the mechanism 11 is connected to the motor every time ordinary control operation of the motor 12 for the normal rotation and the reverse rotation of the motor 12 is performed, and driving for focusing is realized. When the motor 12 is stopped, the mechanism 11 is disconnected and the manual adjustment of the barrel 6 is easily performed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明はシステムカメラ、特
に一眼レフカメラの交換レンズの鏡筒に関し、さらに詳
しくは手動距離環調整が可能なAF一眼レフカメラのレ
ンズ鏡筒のクラッチ機構に関する。
The present invention relates to a system camera, and more particularly to a lens barrel of an interchangeable lens of a single-lens reflex camera, and more particularly to a clutch mechanism of a lens barrel of an AF single-lens reflex camera capable of manual distance ring adjustment.

【0002】[0002]

【従来の技術】AF一眼レフにおいて、ボデー内モータ
式及びレンズ内モーター式AF専用交換レンズの手動距
離環調整機構では手動によるクラッチ機構を設置し、駆
動モーターの連動系と手動連動系を切り換える方法が一
般的である。しかし、使用時において、切り換え操作の
煩わしさや、撮影のタイミングなどから問題があった。
また、駆動モータが超音波モータの場合、連動系が結合
したまま無理矢理、手で距離環を回した場合、手動力が
モータ側に逆伝達し、超音波モータの圧接状態を保って
いるローターとステータが摺動し、特性を損ねる危険性
があった。
2. Description of the Related Art In an AF single-lens reflex camera, a manual clutch mechanism is installed in a manual distance ring adjusting mechanism of an in-body motor type and an in-lens motor type AF exclusive interchangeable lens, and a method of switching between an interlocking system of a driving motor and a manual interlocking system. Is common. However, at the time of use, there is a problem due to the inconvenience of the switching operation and the timing of shooting.
Also, when the drive motor is an ultrasonic motor, when the distance ring is turned by hand while the interlocking system is coupled, the manual force is transmitted back to the motor side, and the rotor that maintains the pressure contact state of the ultrasonic motor is There was a risk that the stator would slide and impair the characteristics.

【0003】[0003]

【発明が解決しようとする課題】これらの操作性の不満
や危険性を除くには、モータ駆動時には正規にモータ駆
動力が距離調整環に伝動し、モータによる距離調整が可
能であるにもかかわらず、距離調整環を手動調整した場
合、手動側からの動力がモータ側に伝わらない構造の動
力伝達機構が望まれていた。
In order to eliminate the dissatisfaction and danger of the operability, when the motor is driven, the motor driving force is transmitted to the distance adjusting ring, and the distance can be adjusted by the motor. However, when the distance adjustment ring is manually adjusted, a power transmission mechanism having a structure in which power from the manual side is not transmitted to the motor side has been desired.

【0004】[0004]

【課題を解決するための手段】本発明は、このような課
題を解決するため、モータから減速機構を通して駆動す
る距離調整筒とこれと連動する手動調整筒を持つ一般鏡
筒において、モータ駆動時以外はモータから距離調整筒
までの駆動連結機構の一部が常時分断していて、手動切
り替え操作無しに距離調整筒の手動調整ができ、自動焦
点調整時のモータの回転動力が加わった時のみ連結し、
モータ動力が距離調整筒に伝動可能なクラッチ機構を設
置して解決を図った。
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a general lens barrel having a distance adjusting cylinder driven from a motor through a speed reduction mechanism and a manual adjusting cylinder interlocked with the distance adjusting cylinder. Other than the above, a part of the drive connection mechanism from the motor to the distance adjustment cylinder is always disconnected, so that the distance adjustment cylinder can be manually adjusted without manual switching operation, and only when the motor's rotational power during auto focus adjustment is applied Concatenate,
The solution was achieved by installing a clutch mechanism that can transmit the motor power to the distance adjustment cylinder.

【0005】[0005]

【発明の実施の形態】通常の自動焦点調整不作動時には
クラッチ機構の内部ではモータ側と距離調整筒側の動力
伝達系が遮断されていて、距離調整筒は任意に手動調整
が可能な状態にあり、自動焦点動作時、モータからの回
転動力を得ると、回転始動力によって、クラッチ機構内
部の連結作動が行われ、モータ動力を距離調整筒に伝え
ることが可能となる。またモータ駆動後の停止時はクラ
ッチ機構内部の連結が再び解除されモータと距離調整筒
の間の伝達系が遮断される。
DESCRIPTION OF THE PREFERRED EMBODIMENTS When a normal automatic focus adjustment is not performed, the power transmission systems on the motor side and the distance adjustment cylinder side are shut off inside the clutch mechanism, and the distance adjustment cylinder is in a state where manual adjustment can be arbitrarily performed. In the automatic focusing operation, when the rotational power from the motor is obtained, the coupling operation inside the clutch mechanism is performed by the rotational starting force, and the motor power can be transmitted to the distance adjusting cylinder. When the motor is stopped after driving, the connection inside the clutch mechanism is released again, and the transmission system between the motor and the distance adjusting cylinder is shut off.

【0006】[0006]

【実施例】以下、図面等を参照して本発明の最も良好な
実施形態を説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiments of the present invention will be described below with reference to the drawings.

【0007】図1は本発明のクラッチ機構の概略斜視図
であり、図2はその動作説明図である。図3は本発明の
クラッチ機構を搭載する鏡筒断面図で、レンズ内モータ
式の実施例を示している。図4は本発明のクラッチ機構
に連動するエンコーダを設置した例を示している。図に
おいて同じ部材は同じ符号で示す。図3の鏡筒断面図に
おいて、光軸L0を中心に前部レンズ群L1と後部レン
ズ群L2が有り、レンズ群L2に対して前部レンズ群L
1を直進移動せしめることにより、焦点調整が可能なレ
ンズ鏡筒の例を示している。
FIG. 1 is a schematic perspective view of a clutch mechanism according to the present invention, and FIG. 2 is an explanatory view of its operation. FIG. 3 is a sectional view of a lens barrel equipped with the clutch mechanism of the present invention, showing an embodiment of a motor-in-lens type. FIG. 4 shows an example in which an encoder linked to the clutch mechanism of the present invention is installed. In the drawings, the same members are denoted by the same reference numerals. 3, there is a front lens unit L1 and a rear lens unit L2 around the optical axis L0, and the front lens unit L is different from the lens unit L2.
1 shows an example of a lens barrel in which the focus can be adjusted by moving the lens 1 straight.

【0008】前部レンズ群L1は保持枠1に、後部レン
ズ群L2は保持枠2で保持されていて、前部レンズ群L
1の保持枠1が固定されている距離調整筒5のヘリコイ
ド部5aと移動筒4のヘリコイド部4aが噛み合ってい
て、固定筒3に対して移動筒4と距離調整筒5は一体で
直進移動出来るようになっている。また、距離調整筒5
の上に手動調整筒6があり、内側直進キー溝6aに距離
調整筒5のキー5bがはまっているため、手動調整筒6
の回転を距離調整筒5に伝えることができ、移動筒4と
距離調整筒5の相対角度の変化により、移動筒4に対す
る距離調整筒5および、保持枠1の前部レンズ群L1の
直進位置が変化し、本鏡筒の焦点調整が可能となってい
る。
The front lens unit L1 is held by a holding frame 1, and the rear lens unit L2 is held by a holding frame 2.
The helicoid part 5a of the distance adjusting cylinder 5 to which the holding frame 1 is fixed and the helicoid part 4a of the moving cylinder 4 are engaged with each other. You can do it. In addition, the distance adjusting cylinder 5
There is a manual adjustment cylinder 6 on the top, and the key 5b of the distance adjustment cylinder 5 is fitted in the inner straight keyway 6a.
Can be transmitted to the distance adjusting cylinder 5, and a change in the relative angle between the moving cylinder 4 and the distance adjusting cylinder 5 causes the linear position of the distance adjusting cylinder 5 and the front lens unit L <b> 1 of the holding frame 1 with respect to the moving cylinder 4. Is changed, and the focus of the lens barrel can be adjusted.

【0009】一方、モータ12からの動力はモータ軸1
2aがクラッチ機構11に結合し、クラッチ機構11の
内部で入力と出力が連結している場合、クラッチ機構の
クラッチ軸10に在るピニオン9aから減速歯車列9
b、9c、9dを通し、その出力ピニオン9eに伝え、
噛み合っている手動調整筒6の内歯歯車6bによって手
動調整筒6と距離調整筒5を一体で回動せしめるため、
移動筒4とのヘリコイドによって距離調整筒5が移動筒
4に対して直進移動し、前部レンズ群L1が後部レンズ
群L2との間隔を変えることにより自動焦点調整動作を
可能にしている。
On the other hand, the power from the motor 12 is
2a is coupled to the clutch mechanism 11, and when the input and output are connected inside the clutch mechanism 11, the reduction gear train 9 is moved from the pinion 9a on the clutch shaft 10 of the clutch mechanism.
b, 9c, 9d, to the output pinion 9e,
In order to rotate the manual adjustment cylinder 6 and the distance adjustment cylinder 5 integrally by the internal gear 6b of the engaged manual adjustment cylinder 6,
The helicoid with the movable barrel 4 causes the distance adjusting barrel 5 to move straight with respect to the movable barrel 4, and the front lens unit L1 changes the distance between the front lens unit L1 and the rear lens unit L2 to enable the automatic focus adjustment operation.

【0010】従来の構造ではモータ軸12aとクラッチ
軸10は結合されていて、モータ動力は手動調整筒6を
調整回動することは可能であるものの、そのままで手動
調整するにはモータ12にまで遡って回転せしめること
になり、手動調整筒6の操作が非常に重く、またモータ
が超音波モータの場合は不用意に回転せしめることによ
り圧接しているローターとステータのバランスを崩して
しまう懼れがあった。一般の機構では手動調整時にはモ
ータから手動調整筒までの伝動機構の中間に連結を遮断
する手動クラッチを設置し、このクラッチで連結を遮断
してから手動で距離調整すると言う二段操作によって、
これを避けていた。しかし、これは操作上煩わしかった
ことは前記で述べた通りである。
In the conventional structure, the motor shaft 12a and the clutch shaft 10 are connected, and although the motor power can adjust and rotate the manual adjustment cylinder 6, it is necessary to use the motor 12 to perform manual adjustment as it is. Rotation is performed retroactively, and the operation of the manual adjustment cylinder 6 is very heavy. If the motor is an ultrasonic motor, careless rotation may cause a loss of the balance between the pressed rotor and the stator. was there. In a general mechanism, at the time of manual adjustment, a manual clutch that cuts off the connection is installed in the middle of the transmission mechanism from the motor to the manual adjustment cylinder, and the two-step operation that cuts off the connection with this clutch and then manually adjusts the distance,
I avoided this. However, this is troublesome in operation, as described above.

【0011】本発明では図3のようにモータ12と伝達
機構であるピニオン9a、減速歯車列9b、9c、9
d、出力ピニオン9eの間に自動的に動作するクラッチ
機構11を設け、距離の手動調整時にいちいち連結遮断
の切り替え操作を必要としない方法で解決を図ったもの
で、以下クラッチ機構11の構造と動作について詳述す
る。
In the present invention, as shown in FIG. 3, a motor 12, a pinion 9a as a transmission mechanism, and a reduction gear train 9b, 9c, 9
d, an automatically operated clutch mechanism 11 is provided between the output pinion 9e, and the solution is achieved by a method that does not require the switching operation of connection disconnection at the time of manual adjustment of the distance. The operation will be described in detail.

【0012】図1はこのクラッチ機構11の概略斜視図
でモータ軸12aにはモータピニオン13があり、モー
タ伝動歯車14と噛み合っている。モータ伝動歯車14
には作動ピン15が上向きに植設されていて、同軸上に
重ねて設置している中立歯車16の長穴16aを貫通し
ている。またモータ伝動歯車14はクラッチ軸10に対
して遊嵌の状態にある。
FIG. 1 is a schematic perspective view of the clutch mechanism 11. A motor shaft 12a has a motor pinion 13 which meshes with a motor transmission gear 14. Motor transmission gear 14
, An operating pin 15 is implanted upward, and penetrates a long hole 16a of a neutral gear 16 which is coaxially superimposed and installed. The motor transmission gear 14 is in a state of being loosely fitted to the clutch shaft 10.

【0013】中立歯車16上には左右対称の係止レバー
(左)17と係止レバー(右)20が係止レバー軸23
を中心にクラッチ軸10に固定されているラチェット2
5を挟んで左右に配設し、係止レバー軸23にあるバネ
24は係止レバー17のバネ掛けピン(左)18とバネ
掛けピン(右)21に掛け、左右の係止レバー17の爪
部17a、20aをラチェット25に対して係合しない
ストッパーピン(左)19とストッパーピン(右)22
に当てる位置まで広げ付勢している。左右係止レバーの
先端部17bと20bはモータ伝動歯車14の作動ピン
15を左右から挟み込むようにしてある。クラッチ軸1
0には動力を減速歯車に伝えるピニオン9aが固定され
ている。
A symmetric locking lever (left) 17 and a locking lever (right) 20 are provided on the neutral gear 16 with a locking lever shaft 23.
Ratchet 2 fixed to clutch shaft 10
5, and a spring 24 on a locking lever shaft 23 is hooked on a spring hooking pin (left) 18 and a spring hooking pin (right) 21 of the locking lever 17. A stopper pin (left) 19 and a stopper pin (right) 22 that do not engage the pawl portions 17a and 20a with the ratchet 25.
It is spread and biased to the position to hit. The tips 17b and 20b of the left and right locking levers are configured to sandwich the operating pin 15 of the motor transmission gear 14 from the left and right. Clutch shaft 1
At 0, a pinion 9a for transmitting power to the reduction gear is fixed.

【0014】中立歯車16は図1で示すように第1増速
ピニオン26と噛み合い、これと一体の増速ギヤー27
から第2増速ピニオン28に伝えて、これに固定されて
いるフライホイル29を高速回転せしめ、本フライホイ
ルを含めた増速機構によって慣性作動するよう構成され
ている。
As shown in FIG. 1, the neutral gear 16 meshes with a first speed increasing pinion 26, and a speed increasing gear 27 integrated therewith.
To the second speed increasing pinion 28, and the flywheel 29 fixed thereto is rotated at a high speed, and the inertia operation is performed by the speed increasing mechanism including the present flywheel.

【0015】次にクラッチ機構の動作を図2によって詳
しく説明すると、自動焦点動作時のモータによる焦点調
整の場合、調整作動のためのモータ回転は左右どちらか
の回転であるが、どちらの回転でも対応していなければ
ならないことから右回転の場合と左回転の場合を別々に
説明することにする。図2(I)は本クラッチ機構の平
面図でピニオン9aは省略している。図2(II)はモー
タ左右回転始動時のクラッチ作動図で図2(III)はモ
ータ回転継続で動力伝達状態の作動図、図2(IV)はモ
ータ停止時におけるクラッチ解除の作動図である。
Next, the operation of the clutch mechanism will be described in detail with reference to FIG. 2. In the case of the focus adjustment by the motor during the automatic focus operation, the rotation of the motor for the adjustment operation is either left or right. Since it is necessary to correspond, the case of right rotation and the case of left rotation will be described separately. FIG. 2 (I) is a plan view of the present clutch mechanism, in which the pinion 9a is omitted. 2 (II) is an operation diagram of the clutch at the time of starting the left-right rotation of the motor, FIG. 2 (III) is an operation diagram of the power transmission state while the motor continues to rotate, and FIG. 2 (IV) is an operation diagram of the clutch release when the motor is stopped. .

【0016】モータが作動してない状態では図2(I)
に示すようにクラッチ軸10はモータ伝動歯車14に対
して自由に回転できるし、中立歯車16もクラッチ軸1
0に対しては遊嵌状態で、軸のラチェット25に対して
左右係止レバーの爪部17a、20a共に僅少間隔をあ
けているためクラッチ軸10は何も拘束されなく自由に
回転できる状態にある。このため手動調整筒6に手動力
が加わって、連動歯車列であるピニオン9a、減速歯車
列9b、9c、9d、出力ピニオン9eを経て逆方向の
モータ側に伝えようとしても、ピニオン9aからクラッ
チ軸10を空転させるだけでモータ側に伝わらないため
手動での距離調整が自由で、軽快な操作が可能となる。
FIG. 2 (I) when the motor is not operating
The clutch shaft 10 can freely rotate with respect to the motor transmission gear 14 as shown in FIG.
0, the clutch shaft 10 can be freely rotated without any restraint because the claw portions 17a, 20a of the left and right locking levers are slightly spaced from the ratchet 25 of the shaft. is there. Therefore, even if a manual force is applied to the manual adjustment cylinder 6 and the transmission is transmitted to the motor in the opposite direction via the pinion 9a as the interlocking gear train, the reduction gear trains 9b, 9c, 9d, and the output pinion 9e, the clutch is transmitted from the pinion 9a. Since the shaft 10 is only idled and does not transmit to the motor side, the distance can be manually adjusted and light operation is possible.

【0017】次に自動焦点作動時のようにモータが回転
する場合を考えてみると、図2(II)のAに示すように
モータピニオン13が右回転し始めると、噛み合ってい
るモータ伝動歯車14が左回転を始める。これに合わせ
てモータ電動歯車14に植設されている作動ピン15も
一緒に回転し、このピンの左側に在る係止レバー(右)
20の先端部20bを押して中立歯車16も回転しよう
とするが、中立歯車16には第1増速ピニオン26から
フライホイル29までの慣性機構が連結していて、始動
力に対して抵抗があってすぐには動き出さない。このた
めバネ24の付勢力に逆らって係止レバー(右)20は
係止レバー軸23を中心に作動ピン15の左移動に従っ
て倒れて行き、中心にあるラチェット25の歯に係止レ
バー(右)20の爪部20aが噛み合い、係止レバー
(右)20がラチェット25と結合することになる。図
に示すように作動ピン15が角度Rl左回転したところ
で結合するようになっている。
Next, let us consider a case where the motor rotates as in the automatic focusing operation. When the motor pinion 13 starts to rotate clockwise as shown in FIG. 14 starts to turn left. At the same time, the operating pin 15 implanted in the motor electric gear 14 rotates together with the locking lever (right) on the left side of the pin.
The neutral gear 16 also tries to rotate by pushing the tip portion 20b of the motor 20, but an inertia mechanism from the first speed increasing pinion 26 to the flywheel 29 is connected to the neutral gear 16, and there is no resistance to the starting force. Does not start immediately. For this reason, the locking lever (right) 20 is depressed against the urging force of the spring 24 in accordance with the left movement of the operating pin 15 about the locking lever shaft 23, and the locking lever (right) is moved to the teeth of the ratchet 25 at the center. ) 20 are engaged with each other, and the locking lever (right) 20 is connected to the ratchet 25. As shown in the figure, the operation pin 15 is connected when the angle Rl is rotated leftward.

【0018】更に回転が継続されと図2(III)のAに
示すようにモータ伝動歯車14の左回転に合わせて係止
レバー(右)20を倒し、中心にあるラチェット25と
結合した状態のまま中立歯車16を第1増速ピニオン2
6からフライホイル29までの慣性機構ごと回転するた
め、ラチェット25と一体のクラッチ軸10のピニオン
から減速歯車列9b、9c、9d、出力ピニオン9eを
通して手動調整筒6をモータ12で回動でき距離調整筒
5を可変して焦点調整が可能となる。
When the rotation is further continued, the locking lever (right) 20 is lowered in accordance with the left rotation of the motor transmission gear 14 as shown in FIG. While maintaining the neutral gear 16 in the first speed increasing pinion 2
The motor 12 can be rotated by the motor 12 through the reduction gear trains 9b, 9c, 9d and the output pinion 9e from the pinion of the clutch shaft 10 integrated with the ratchet 25 because the inertia mechanism from 6 to the flywheel 29 rotates. The focus can be adjusted by changing the adjusting cylinder 5.

【0019】次にモータ右回転作動から合焦点に達し、
モータが停止した時を考えてみると、その状態を表した
図が図2(IV)でモータが完全に停止したためモータ伝
動歯車14の作動ピン15が停止するが、フライホイル
29を含む慣性機構のため中立歯車16は慣性力を受け
中立歯車16だけが急激に止まらずに、左回転を僅少角
Wlだけオーバーランすることになり、作動ピン15に
対し、係止レバー(右)20はバネ24の反発力に合わ
せて戻されることになる。この過程で係止レバー(右)
20の爪部20aはラチェット25から離れ、結合が解
かれることにより図2(I)のクラッチ遮断の自由状態
に復帰する。
Next, the focus is reached from the clockwise rotation operation of the motor,
Considering the time when the motor is stopped, the operation stop pin 15 of the motor transmission gear 14 stops because the motor is completely stopped in FIG. 2 (IV), and the inertia mechanism including the flywheel 29 is shown. Therefore, the neutral gear 16 receives the inertial force, so that only the neutral gear 16 does not stop suddenly, but overruns counterclockwise by a small angle Wl. It will be returned according to the repulsion force of 24. Locking lever (right) in this process
The pawl portion 20a of 20 is separated from the ratchet 25, and the connection is released, thereby returning to the free state of disconnecting the clutch shown in FIG.

【0020】モータの左回転の場合も同様に図2(II)
のBに示すようにモータ伝動歯車14の右回転始動に対
して作動ピン15が回転角Rr移動する過程で係止レバ
ー(左)17の爪部17aがラチェット25に噛み合い
クラッチが結合して、図2(II)のBのように慣性機構
の第1増速ピニオン26、増速ギヤ27、第2増速ピニ
オン28、フライホイル29と一体で回転し、モータ1
2の左回転動力をモータの右回転同様、手動調整筒6に
伝えることができる。このモータ左回転駆動状態からモ
ータ停止した場合、これも前記説明のモータ右回転から
の停止の場合と同様、中立歯車16が作動ピン15の停
止位置からWr角度オーバーランし、この間に係止レバ
ー(左)17がラチェット25との結合を解き、クラッ
チ解除の図2(I)状態に復帰する。以上説明のように
モータの正転、逆転の通常のモータ制御動作に対して、
その都度クラッチが結合し、焦点調整のための駆動がで
き、モータ停止時にはクラッチが外れて、手動調整筒6
の手動による調整が容易に行えることが分かる。
FIG. 2 (II) also shows the case of the left rotation of the motor.
As shown in FIG. 3B, the claw portion 17a of the locking lever (left) 17 engages with the ratchet 25 in the process of moving the operating pin 15 by the rotation angle Rr with respect to the right rotation start of the motor transmission gear 14, and the clutch is coupled. 2B, the motor 1 rotates integrally with the first speed increasing pinion 26, speed increasing gear 27, second speed increasing pinion 28, and flywheel 29 of the inertia mechanism.
2 can be transmitted to the manual adjustment cylinder 6 as in the case of the clockwise rotation of the motor. When the motor is stopped from the motor left rotation drive state, the neutral gear 16 overruns the Wr angle from the stop position of the operation pin 15 similarly to the case of the stop from the motor right rotation described above, and the locking lever (Left) 17 releases the connection with the ratchet 25 and returns to the state of FIG. As described above, the normal motor control operation of the normal rotation and the reverse rotation of the motor
Each time the clutch is engaged, the drive for focus adjustment can be performed.
It can be seen that the manual adjustment of is easily performed.

【0021】焦点調整のためにモータの回転駆動により
レンズ鏡筒の距離調整筒5の移動量を検出し、焦点誤差
に合わせて制御する必要があるが、一般に距離調整筒の
移動量の分解能を高めるためモータ駆動機構に連動する
増速機構を通して端末にスリット円盤を設置し、高速回
転するスリット円盤のスリット数をホトインターラプタ
で読み取る構造のエンコーダ装置をモータと連動可能な
位置に設置している。本レンズ鏡筒にも同構造のエンコ
ーダ装置を設置した例を図4に示してある。本機構では
中立歯車16に第1増速ピニオン26と増速ギヤー27
及び第2増速ピニオン28によって構成する増速機構を
連結し、中立歯車16の回動に合わせて第2増速ピニオ
ン28を同軸とするスリット円盤30を高速回転せし
め、そのスリット30aをホトインターラプタ31で読
み取る構造となっている。本方法はエンコーダ装置が増
速機構を備えているため慣性効果により、クラッチ作動
に効果的であり、モータ始動時のクラッチ作動の回転が
スリット円盤30に伝わらないため、距離調整筒5の移
動に対して誤計測することがない。
In order to adjust the focus, it is necessary to detect the amount of movement of the distance adjusting cylinder 5 of the lens barrel by rotating the motor and control it in accordance with the focus error. In general, the resolution of the amount of movement of the distance adjusting cylinder is required. A slit disk is installed at the terminal through a speed increasing mechanism that is linked to the motor drive mechanism, and an encoder device that reads the number of slits on the slit disk that rotates at high speed with a photo interrupter is installed at a position that can be linked to the motor. . FIG. 4 shows an example in which an encoder device having the same structure is installed in the present lens barrel. In this mechanism, a first speed increasing pinion 26 and a speed increasing gear 27
And a speed-up mechanism constituted by a second speed-up pinion 28, and the slit disk 30 having the second speed-up pinion 28 coaxially rotated at high speed in accordance with the rotation of the neutral gear 16, and the slit 30a is The structure is read by the raptor 31. This method is effective for the clutch operation due to the inertia effect because the encoder device is provided with the speed increasing mechanism. Since the rotation of the clutch operation at the time of starting the motor is not transmitted to the slit disk 30, the method for moving the distance adjusting cylinder 5 is effective. There is no erroneous measurement.

【0022】[0022]

【発明の効果】以上説明したように本発明の構成によれ
ば、AFレンズのマニュアル調整において特別な切り替
え手段を設けずに常時調整が可能な安価で、品質の高い
AFレンズ鏡筒が提供出来る。
As described above, according to the structure of the present invention, it is possible to provide an inexpensive and high-quality AF lens barrel that can be adjusted at all times without providing any special switching means in the manual adjustment of the AF lens. .

【図面の簡単な説明】[Brief description of the drawings]

【図1】実施例の自動クラッチ機構の概略斜視図であ
る。
FIG. 1 is a schematic perspective view of an automatic clutch mechanism according to an embodiment.

【図2】実施例の自動クラッチ機構の動作説明図であ
る。
FIG. 2 is an operation explanatory view of the automatic clutch mechanism of the embodiment.

【図3】実施例の鏡筒断面図である。FIG. 3 is a sectional view of a lens barrel of the embodiment.

【図4】実施例においてエンコーダを設置した図であ
る。
FIG. 4 is a diagram in which an encoder is installed in the embodiment.

【符号の説明】[Explanation of symbols]

1 前部レンズ群L1保持枠 2 後部レンズ群L2保持枠 3 固定筒 4 移動筒 5 距離調整筒 6 手動調整筒 10 クラッチ軸 11 クラッチ機構 12 モータ 13 モータピニオン 14 モータ伝動歯車 15 作動ピン 16 中立歯車 17 係止レバー(左) 18 バネ掛けピン(左) 19 ストッパーピン(左) 20 係止レバー(右) 21 バネ掛けピン(右) 22 ストッパーピン(右) 23 係止レバー軸 24 バネ 25 ラチェット 26 第1増速ピニオン 27 増速ギヤー 28 第2増速ピニオン 29 フライホイール 30 スリット円盤 31 ホトインターラプタ DESCRIPTION OF SYMBOLS 1 Front lens group L1 holding frame 2 Rear lens group L2 holding frame 3 Fixed cylinder 4 Moving cylinder 5 Distance adjustment cylinder 6 Manual adjustment cylinder 10 Clutch shaft 11 Clutch mechanism 12 Motor 13 Motor pinion 14 Motor transmission gear 15 Operating pin 16 Neutral gear 17 Lock Lever (Left) 18 Spring Lock Pin (Left) 19 Stopper Pin (Left) 20 Lock Lever (Right) 21 Spring Lock Pin (Right) 22 Stopper Pin (Right) 23 Lock Lever Shaft 24 Spring 25 Ratchet 26 First speed-up pinion 27 Speed-up gear 28 Second speed-up pinion 29 Flywheel 30 Slit disk 31 Photointerrupter

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 距離調整筒をモータで駆動し、焦点調整
を行うレンズ鏡筒において、通常はモータから前記距離
調整筒までの動力伝達機構の中間で遮断されていて、前
記距離調整筒の手動による調整が可能で、モータに駆動
力が加わった時のみ前記モータから距離調整筒までの動
力伝達機構が連結し、モータによる自動焦点調整が可能
となる機能を有することを特徴とするレンズ鏡筒のクラ
ッチ機構。
1. A lens barrel for driving a distance adjusting cylinder with a motor to perform focus adjustment, which is normally shut off in the middle of a power transmission mechanism from the motor to the distance adjusting cylinder, and is manually operated by the distance adjusting cylinder. The lens barrel is characterized in that the lens barrel has a function that the power transmission mechanism from the motor to the distance adjustment barrel is connected only when a driving force is applied to the motor and the motor can perform automatic focus adjustment. Clutch mechanism.
【請求項2】 モータ側に連結するモータ伝動歯車と、
距離調整筒側に繋がるピニオンと中心の外側に向かって
付勢された対称形の係止レバーを一対として設置した中
立歯車を同軸に設置し、前記距離調整筒側の伝達歯車と
ラチェットを固定した軸に対し、前記モータ側の伝達歯
車及び中立歯車が自由回転し、手動による距離調整筒の
回動が可能で、モータから正及び逆回転のいずれかの動
力が伝わった時はモータ側の伝達歯車が前記中立歯車の
係止レバーの爪を中心に寄せ、前記ラチェットと噛合す
ることにより、モータ側動力伝達部材と距離調整筒側動
力伝達部材が結合して、距離調整筒のモータによる駆動
を可能にすることを特徴とする請求項1記載のレンズ鏡
筒のクラッチ機構。
2. A motor transmission gear connected to a motor side,
A neutral gear having a pair of a pinion connected to the distance adjusting cylinder and a symmetrical locking lever urged toward the outside of the center is installed coaxially, and the transmission gear and the ratchet on the distance adjusting cylinder are fixed. The transmission gear and the neutral gear on the motor side freely rotate with respect to the shaft, and the distance adjustment cylinder can be manually rotated. When either forward or reverse power is transmitted from the motor, the transmission on the motor side is transmitted. When the gear is brought close to the hook of the locking lever of the neutral gear and meshes with the ratchet, the motor-side power transmission member and the distance adjustment cylinder-side power transmission member are connected to drive the distance adjustment cylinder by the motor. The clutch mechanism for a lens barrel according to claim 1, wherein the clutch mechanism is enabled.
【請求項3】 前記中立歯車にフライホイル効果のある
増速機構を連結し、モータ回転始動時の前記係止レバー
のラチェットへの噛合及びモータ回転停止時の前記係止
レバーのラチェット噛合の解除動作の確実性を高めたこ
とを特徴とする請求項1記載のレンズ鏡筒のクラッチ機
構。
3. A speed increasing mechanism having a flywheel effect is connected to the neutral gear, and the engagement of the locking lever with the ratchet at the start of motor rotation and the release of ratchet engagement of the locking lever at the stop of motor rotation. 2. The clutch mechanism for a lens barrel according to claim 1, wherein the operation reliability is enhanced.
【請求項4】 モータ駆動機構に連動し、増速機構を通
した端末のスリット円盤回転のスリット数の読み取りに
よって前記レンズ鏡筒の距離調整筒の移動量を制御する
エンコーダ装置を前記中立歯車に連結したことを特徴と
する請求項1記載のレンズ鏡筒のクラッチ機構。
4. An encoder device which is linked to a motor drive mechanism and controls the amount of movement of the distance adjusting barrel of the lens barrel by reading the number of slits of the slit disk rotation of the terminal through a speed increasing mechanism is provided on the neutral gear. The clutch mechanism for a lens barrel according to claim 1, wherein the clutch mechanism is connected.
JP01313698A 1998-01-08 1998-01-08 Lens barrel clutch mechanism Expired - Lifetime JP3737266B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP01313698A JP3737266B2 (en) 1998-01-08 1998-01-08 Lens barrel clutch mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP01313698A JP3737266B2 (en) 1998-01-08 1998-01-08 Lens barrel clutch mechanism

Publications (2)

Publication Number Publication Date
JPH11202182A true JPH11202182A (en) 1999-07-30
JP3737266B2 JP3737266B2 (en) 2006-01-18

Family

ID=11824757

Family Applications (1)

Application Number Title Priority Date Filing Date
JP01313698A Expired - Lifetime JP3737266B2 (en) 1998-01-08 1998-01-08 Lens barrel clutch mechanism

Country Status (1)

Country Link
JP (1) JP3737266B2 (en)

Also Published As

Publication number Publication date
JP3737266B2 (en) 2006-01-18

Similar Documents

Publication Publication Date Title
US4456356A (en) Focus adjusting device of a camera
US4728979A (en) Apparatus for exposure control/focus adjustment for camera
JPS6317436A (en) Intermediate optical instrument incapable of multiple coupling
JPH085894A (en) Lens barrel
JP3929171B2 (en) Lens barrel
US4525053A (en) Motor-drivable photographing lens assembly
US5266982A (en) Automatic focusing camera with automatic manual override
JPH11202182A (en) Clutch mechanism for lens barrel
US4958177A (en) Rotational drive mechanism
US5229800A (en) Lens barrel with selectable manual and auto focus
JP3181777B2 (en) Interchangeable lens camera
US4956657A (en) Photographic camera
JP3052026B2 (en) Motor driven shutter
JPS62198809A (en) Backlash correcting device for automatic focus adjusting device
JP2591049B2 (en) Camera system
JP4271761B2 (en) Lens barrel
US5327185A (en) Motor driven system for controlling the diaphragm and shutter of a camera
JPH0895145A (en) Motor-driven diaphragm driving mechanism for camera and interchangeable lens mount part connecting mechanism in autofocusing driving mechanism
JP3030671B2 (en) Motor driven shutter
JP2002318339A (en) Focusing mode switching device for camera lens
JP2815209B2 (en) Camera and power transmission
JP2563056Y2 (en) Lens barrel with automatic and manual focus adjustment
JP2723503B2 (en) Auto focus camera
JP2501737Y2 (en) Camera auto focus device
JPH08320428A (en) Lens barrel

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20030909

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20050401

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20050510

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20050701

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20050701

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20050701

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20051025

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20051026

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20091104

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101104

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111104

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121104

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131104

Year of fee payment: 8

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

EXPY Cancellation because of completion of term