JPH0549970B2 - - Google Patents
Info
- Publication number
- JPH0549970B2 JPH0549970B2 JP57173549A JP17354982A JPH0549970B2 JP H0549970 B2 JPH0549970 B2 JP H0549970B2 JP 57173549 A JP57173549 A JP 57173549A JP 17354982 A JP17354982 A JP 17354982A JP H0549970 B2 JPH0549970 B2 JP H0549970B2
- Authority
- JP
- Japan
- Prior art keywords
- zoom
- reciprocating
- cam
- lens barrel
- rotation
- 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
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、ビデオカメラなどのズームレンズ装
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 zoom lens device such as a video camera.
従来例の構成とその問題点
近年、ポータブルビデオレコーダの普及に伴な
つてビデオカメラも一般家庭で使われるようにな
つてきた。そして使い勝手を向上させるため、ズ
ームレンズをモータで駆動する方式のものが多く
なつてきた。これは操作スイツチを押すだけでズ
ーム操作が簡単に行なえるので非常に使いやすい
便利な機構である。しかしながら、従来のこのよ
うな機能を持つズームレンズ装置の多くはズーム
スピードが一定であり、ズーミングの操作スイツ
チを押しつづけた場合、ズームの終端で突然ズー
ミングが停止し、撮影された画面を見るとシヨツ
ク感を受けることがあつた。またズーム操作を途
中から開始して、終端位置までわずかな量しか動
く範囲がない場合、きわめて短時間でズーミング
が終了してしまい、ズーミングによる撮影画面が
不自然になるという問題があつた。Conventional configuration and its problems In recent years, along with the spread of portable video recorders, video cameras have also come into use in general households. In order to improve usability, zoom lenses are increasingly being driven by motors. This is a convenient mechanism that is extremely easy to use, as you can easily perform zoom operations by simply pressing the operation switch. However, most conventional zoom lens devices with such functions have a constant zoom speed, and if you keep pressing the zoom operation switch, zooming will suddenly stop at the end of the zoom, and when you look at the captured screen, it will stop. There were times when I felt shocked. Furthermore, if a zoom operation is started midway and there is only a small range of movement until the end position, zooming ends in a very short time, causing the problem that the photographed screen resulting from zooming becomes unnatural.
発明の目的
本発明は上記従来の欠点を解消するもので、ズ
ームの終端近傍でもズーミングによる撮影画面を
自然なものにすることのできるズームレンズ装置
を得ることを目的とする。OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the conventional technology, and aims to provide a zoom lens device that can produce a natural photographic image even near the end of the zoom.
発明の構成
上記目的を達するため、本発明のズームレンズ
装置は、変倍レンズ系を保持する枠体と、往復回
動することにより前記枠体を光軸方向に往復移動
させる往復回動部材と、この往復回動部材を往復
回動させる回動駆動手段と、前記往復回動部材の
回動範囲を規制する規制手段と、前記往復回動部
材の端面に設けられた端面カムと、前記端面カム
に対し光軸方向に押圧力を付与する押圧力付与部
材とを具備し、前記端面カムの、前記往復回動部
材の回動範囲の終端近傍に対応する位置に傾斜面
を形成して構成したものである。Structure of the Invention In order to achieve the above object, the zoom lens device of the present invention includes a frame body that holds a variable power lens system, and a reciprocating rotating member that reciprocates the frame body in the optical axis direction by reciprocating rotation. , a rotation drive means for reciprocating the reciprocating rotation member, a regulating means for regulating the rotation range of the reciprocation rotation member, an end face cam provided on an end face of the reciprocation rotation member, and the end face. a pressing force applying member that applies a pressing force to the cam in the optical axis direction, and an inclined surface is formed on the end cam at a position corresponding to the vicinity of the end of the rotation range of the reciprocating rotation member. This is what I did.
実施例の説明
以下、本発明の一実施例について、図面に基づ
いて説明する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１はピントレンズであり、こ
のピントレンズ１を保持する合焦鏡胴２に形成さ
れたメスヘリコイド２ａは、固定鏡胴３に形成さ
れたオスヘリコイド３ａと噛合しており、合焦鏡
胴２を回動させることによりピントレンズ１が光
軸方向に移動してピント合せを行なうことができ
る。前記固定鏡胴３内には、第１のズームレンズ
群４及び第２のズームレンズ群５がそれぞれ第１
の保持枠６及び第２の保持枠７に保持されて内蔵
されており、これら第１及び第２の保持枠６，７
は軸８ａ，８ｂに案内されて光軸方向に移動可能
なように構成されている。前記第１の保持枠６に
植設されたピン９と第２の保持枠７に植設された
ピン１０とは、それぞれ前記固定鏡胴３内に回動
自在に配置されたカム筒１１に形成された一対の
カム溝１１ａ，１１ｂに遊嵌しており、カム筒１
１が回動するとカム溝１１ａ，１１ｂにピン９，
１０が案内されて光軸方向に移動し、第１及び第
２の保持枠６，７が光軸方向に移動してズーム比
が変わるように構成されている。そしてカム筒１
１に植設されたピン１２は、固定鏡胴３に形成さ
れた長孔１３を貫通して固定鏡胴３の外部に突出
しており、固定鏡胴３に回動自在に外嵌するズー
ム操作鏡胴１４の内周面に形成された溝部１４ａ
と係合しているので、ズーム操作鏡胴１４を回動
させるとカム筒１１も一体に回動する。前記ズー
ム操作鏡胴１４には歯車１５が外嵌固着されてお
り、この歯車１５はモータ１６の回転軸に外嵌固
着された小歯車１７と噛合しており、モータ１６
が回動するとズーム操作鏡胴１４及びカム筒１１
が回動し、第１及び第２のズーム群４，５が光軸
方向に移動する。前記ズーム操作鏡胴１４の回動
範囲は、固定鏡胴３に形成された長孔１３の両端
にピン１２が当接して規制される。前記ズーム操
作用鏡筒１４は、その一端面に端面カム１８を有
しており、固定鏡胴３の一端部外周面に取付けら
れた板ばね１９と接触している。 In FIG. 1, 1 is a focusing lens, and a female helicoid 2a formed on a focusing lens barrel 2 that holds this focusing lens 1 is meshed with a male helicoid 3a formed on a fixed lens barrel 3. By rotating the focusing lens barrel 2, the focusing lens 1 can be moved in the optical axis direction to perform focusing. Inside the fixed lens barrel 3, a first zoom lens group 4 and a second zoom lens group 5 are provided.
It is held and built-in by a holding frame 6 and a second holding frame 7, and these first and second holding frames 6, 7
are configured to be movable in the optical axis direction while being guided by shafts 8a and 8b. A pin 9 implanted in the first holding frame 6 and a pin 10 implanted in the second holding frame 7 are respectively attached to a cam cylinder 11 rotatably disposed within the fixed lens barrel 3. It is loosely fitted into a pair of cam grooves 11a and 11b formed in the cam cylinder 1.
When the pin 1 rotates, the pin 9 is inserted into the cam grooves 11a and 11b.
10 is guided and moved in the optical axis direction, and the first and second holding frames 6 and 7 are moved in the optical axis direction to change the zoom ratio. and cam tube 1
A pin 12 implanted in the fixed lens barrel 3 passes through a long hole 13 formed in the fixed lens barrel 3 and projects to the outside of the fixed lens barrel 3, and is rotatably fitted onto the fixed lens barrel 3 for zoom operation. Groove 14a formed on the inner circumferential surface of lens barrel 14
, so when the zoom operation lens barrel 14 is rotated, the cam barrel 11 is also rotated together. A gear 15 is externally fitted and fixed to the zoom operation lens barrel 14, and this gear 15 meshes with a small gear 17 that is externally fitted and fixed to the rotating shaft of a motor 16.
When rotates, the zoom operation lens barrel 14 and the cam barrel 11
rotates, and the first and second zoom groups 4 and 5 move in the optical axis direction. The rotation range of the zoom operation lens barrel 14 is regulated by pins 12 abutting both ends of a long hole 13 formed in the fixed lens barrel 3. The zoom operation lens barrel 14 has an end cam 18 on one end surface thereof, and is in contact with a leaf spring 19 attached to the outer peripheral surface of one end of the fixed lens barrel 3.
第２図は端面カム１８の展開図を示すもので、
ズームの終端近傍、すなわち長孔１３の両端部に
対応する部分において傾斜面１８ａ，１８ｂを有
するカム形状となつている。 FIG. 2 shows a developed view of the end cam 18.
It has a cam shape with inclined surfaces 18a and 18b near the end of the zoom, that is, in a portion corresponding to both ends of the elongated hole 13.
第３図はモータ駆動回路の回路図で、２０ａ，
２０ｂはスイツチであり、このスイツチ２０ａ，
２０ｂはモータ１６に印加する電源２１の極性を
変えるもので、互いに連動して動作し、図中に破
線で示す中立位置でモータ１６に印加する電圧を
遮断することができる。まずスイツチ２０ａ，２
０ｂを中立位置から図中に実線で示す位置へ投入
すると、モータ１６が回転し始め、ズーム操作鏡
筒１４が第２図矢印イ方向に回動し、端面カム１
８もズーム操作鏡筒１４と一体に回動する。端面
カム１８の回動に従つて板ばね１９との接触位置
が変化し、板ばね１９が傾斜面１８ａと接触し始
めると、板ばね１９による接触圧が漸次増加し、
ズーム操作鏡胴１４の回動トルクが増加する。さ
らにモータ１６は負荷トルクが増加するため回転
数が漸次低下し、ズームスピードが漸次低下す
る。モータ１６が逆転する場合についても同様で
あるので、その説明を省略する。 Figure 3 is a circuit diagram of the motor drive circuit, 20a,
20b is a switch, and this switch 20a,
Reference numeral 20b changes the polarity of the power supply 21 applied to the motor 16, and they operate in conjunction with each other, so that the voltage applied to the motor 16 can be cut off at a neutral position indicated by a broken line in the figure. First, switch 20a, 2
0b from the neutral position to the position shown by the solid line in the figure, the motor 16 begins to rotate, the zoom operation lens barrel 14 rotates in the direction of arrow A in Figure 2, and the end cam 1
8 also rotates together with the zoom operation lens barrel 14. As the end cam 18 rotates, the contact position with the leaf spring 19 changes, and when the leaf spring 19 begins to come into contact with the inclined surface 18a, the contact pressure by the leaf spring 19 gradually increases,
The rotational torque of the zoom operation lens barrel 14 increases. Further, as the load torque of the motor 16 increases, the number of rotations of the motor 16 gradually decreases, and the zoom speed gradually decreases. The same applies to the case where the motor 16 reverses, so the explanation thereof will be omitted.
発明の効果
以上のように本発明によれば、往復回動部材の
端面に設けられた端面カムと、前記端面カムに対
し光軸方向に押圧力を付与する押圧力付与部材と
を具備し、前記端面カムの、前記往復回動部材の
回動範囲の終端近傍に対応する位置に傾斜面を形
成したことにより、ズームの終端近傍で操作用鏡
胴の回転トルクを安定して漸次増加させ、回動駆
動手段の回転速度を漸次低下させて、ズーム終端
位置での画面のシヨツク感を無くすことができ
る。またズーム終端近傍でのズームスピードの低
下により、撮影者はズーム終端近傍であるという
ことを容易に察知し得る。さらにズーム終端まで
の移動量が少ない場合でも、移動スピード（ズー
ムスピード）が遅くなるため自然なズーミングが
可能となる。Effects of the Invention As described above, the present invention includes an end face cam provided on the end face of a reciprocating rotating member, and a pressing force applying member that applies a pressing force to the end face cam in the optical axis direction, By forming an inclined surface on the end cam at a position corresponding to the vicinity of the end of the rotation range of the reciprocating rotation member, the rotational torque of the operating lens barrel is stably and gradually increased in the vicinity of the end of the zoom, By gradually reducing the rotational speed of the rotation drive means, it is possible to eliminate the feeling of shock on the screen at the zoom end position. In addition, the photographer can easily notice that the zoom speed is near the end of the zoom because the zoom speed decreases near the end of the zoom. Furthermore, even if the amount of movement to the end of the zoom is small, the movement speed (zoom speed) becomes slow, allowing natural zooming.
図面は本発明の一実施例を示し、第１図はズー
ムレンズ装置の断面図、第２図は端面カムの展開
図、第３図はモータ駆動回路の回路図である。
３……固定鏡胴、４，５……ズームレンズ群
（変倍レンズ系）、６，７……保持枠（枠体）、１
１……カム筒、１２……ピン、１３……長孔、１
４……ズーム操作鏡胴（往復回動部材）、１５…
…歯車、１６……モータ、１７……小歯車、１８
……端面カム、１９……板ばね。
The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of a zoom lens device, FIG. 2 is a developed view of an end cam, and FIG. 3 is a circuit diagram of a motor drive circuit. 3... Fixed lens barrel, 4, 5... Zoom lens group (variable magnification lens system), 6, 7... Holding frame (frame body), 1
1...Cam cylinder, 12...Pin, 13...Elongated hole, 1
4...Zoom operation lens barrel (reciprocating rotating member), 15...
...Gear, 16...Motor, 17...Small gear, 18
... End cam, 19 ... Leaf spring.
Claims (1)
ることにより前記枠体を光軸方向に往復移動させ
る往復回動部材と、この往復回動部材を往復回動
させる回動駆動手段と、前記往復回動部材の回動
範囲を規制する規制手段と、前記往復回動部材の
端面に設けられた端面カムと、前記端面カムに対
し光軸方向に押圧力を付与する押圧力付与部材と
を具備し、前記端面カムの、前記往復回動部材の
回動範囲の終端近傍に対応する位置に傾斜面を形
成したことを特徴とするズームレンズ装置。1. A frame for holding a variable magnification lens system, a reciprocating member for reciprocating the frame in the optical axis direction by reciprocating rotation, and a rotation drive means for reciprocating the reciprocating member. , a regulating means for regulating the rotation range of the reciprocating rotating member, an end cam provided on an end surface of the reciprocating rotating member, and a pressing force applying member that applies a pressing force to the end cam in the optical axis direction. A zoom lens device comprising: an inclined surface formed on the end cam at a position corresponding to the vicinity of the end of the rotation range of the reciprocating rotation member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17354982A JPS5961826A (en) | 1982-10-01 | 1982-10-01 | Zoom lens device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17354982A JPS5961826A (en) | 1982-10-01 | 1982-10-01 | Zoom lens device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5961826A JPS5961826A (en) | 1984-04-09 |
| JPH0549970B2 true JPH0549970B2 (en) | 1993-07-27 |
Family
ID=15962589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17354982A Granted JPS5961826A (en) | 1982-10-01 | 1982-10-01 | Zoom lens device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5961826A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS477003U (en) * | 1971-02-17 | 1972-09-26 |
-
1982
- 1982-10-01 JP JP17354982A patent/JPS5961826A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS477003U (en) * | 1971-02-17 | 1972-09-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5961826A (en) | 1984-04-09 |
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