JP3083104B2 - Lens cover opening and closing mechanism - Google Patents
Lens cover opening and closing mechanismInfo
- Publication number
- JP3083104B2 JP3083104B2 JP03001013A JP101391A JP3083104B2 JP 3083104 B2 JP3083104 B2 JP 3083104B2 JP 03001013 A JP03001013 A JP 03001013A JP 101391 A JP101391 A JP 101391A JP 3083104 B2 JP3083104 B2 JP 3083104B2
- Authority
- JP
- Japan
- Prior art keywords
- gear
- lens cover
- lens
- slide member
- moving
- 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
Landscapes
- Blocking Light For Cameras (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はレンズカバーの開閉機構
に係り、特にビデオカメラ等の撮影レンズの前面に配設
されたスライド式のレンズカバーを電動で開閉するレン
ズカバーの開閉機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens cover opening / closing mechanism, and more particularly to a lens cover opening / closing mechanism for electrically opening and closing a slide-type lens cover disposed on the front of a photographic lens of a video camera or the like.
【０００２】[0002]
【従来の技術】一般に、ビデオカメラのレンズカバー
は、撮影レンズに着脱する形式のものが殆どである。こ
れは、ビデオカメラの場合には撮影レンズの口径が大き
く、またカメラ本体から撮影レンズが突出しているた
め、カメラ内蔵型のレンズカバーを設けるスペースがな
い等の理由による。2. Description of the Related Art Generally, most lens covers of video cameras are of a type that can be attached to and detached from a photographic lens. This is because, in the case of a video camera, the aperture of the taking lens is large, and the taking lens protrudes from the camera body, so that there is no space for providing a lens cover with a built-in camera.
【０００３】これに対し、近年、手動操作で開閉するス
ライド式のレンズカバーが設けられたビデオカメラが提
案されている（特願平２─１４２７６７号明細書）。ま
た、電動で上記スライド式のレンズカバーを開閉するこ
とも考えられる。On the other hand, in recent years, there has been proposed a video camera provided with a slide-type lens cover which can be manually opened and closed (Japanese Patent Application No. 2-142767). It is also conceivable to open and close the slide lens cover electrically.
【０００４】[0004]
【発明が解決しようとする課題】ところで、スライド式
のレンズカバーを電動で駆動する場合の一例として、レ
ンズカバー側にラックを設け、これにピニオンを噛み合
わせ、このピニオンを回転させることによってレンズカ
バーを移動させることが考えられる。しかし、この場合
にはレンズカバーよりも長いラックをレンズカバーに設
けなければならず、レンズカバー開時の格納スペースが
大きくなる。By the way, as an example of electrically driving a slide type lens cover, a rack is provided on the lens cover side, a pinion is meshed with the rack, and the pinion is rotated to rotate the lens cover. May be moved. However, in this case, a rack longer than the lens cover must be provided on the lens cover, and the storage space when the lens cover is opened increases.
【０００５】また、レバーの回動によってレンズカバー
を開閉することも考えられるが、この場合にはレンズカ
バーの開閉に必要なレバー長が長くなり、且つこのレバ
ーの回動に必要なスペースも大きくなる。本発明はこの
ような事情に鑑みてなされたもので、よりコンパクトな
駆動機構によってスライド式のレンズカバーを電動で開
閉することができるレンズカバーの開閉機構を提供する
ことを目的とする。It is also conceivable to open and close the lens cover by turning the lever. In this case, however, the length of the lever required to open and close the lens cover is increased, and the space required for turning the lever is also large. Become. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lens cover opening and closing mechanism capable of electrically opening and closing a slide lens cover by a more compact driving mechanism.
【０００６】[0006]
【課題を解決するための手段】本発明は前記目的を達成
するために、撮影レンズの前面位置と撮影レンズから退
避する退避位置との間で円弧状に移動自在に配設され、
該撮影レンズを開閉するためのスライド式の１枚のレン
ズカバーと、前記レンズカバーに固定された第１のギア
で、歯が前記レンズカバーの移動方向に沿って形成され
た第１のギアと、本体フレーム側に固定された第２のギ
アで、前記第１のギアに対峙して設けられた第２のギア
と、前記レンズカバーと同方向に移動自在に配設され、
それぞれ前記第１のギア及び第２のギアに噛み合う遊星
ギアを有する円弧状に移動するスライド部材と、前記ス
ライド部材を電動で移動させ、前記遊星ギア及び第１の
ギアを介して前記レンズカバーを前記撮影レンズの前面
位置と撮影レンズから退避した退避位置との間で移動さ
せる電動駆動手段であって、モータと、該モータから前
記スライド部材に駆動力を伝達する動力伝達手段と、該
動力伝達手段内に組み込まれた安全機構であって、支軸
上にそれぞれ回転自在に配設された２つのギアと、前記
支軸上に配設され、前記２つのギア間における回転駆動
力を伝達するコイルバネとからなる安全機構とを有する
電動駆動手段と、を備え、前記第１のギア、第２のギ
ア、スライド部材及び電動駆動手段を、それぞれ前記レ
ンズカバーの移動シルエット内に設けたことを特徴とし
ている。また、前記電動駆動手段は、前記動力伝達手段
内に組み込まれた安全機構であって、所定の摩擦力をも
って支軸に取り付けられたギアからなる安全機構を有す
ることを特徴としている。In order to achieve the above object, the present invention is arranged so as to be movable in an arc between a front position of a taking lens and a retracted position retracted from the taking lens.
A slide-type lens cover for opening and closing the photographing lens, and a first gear having teeth formed along a moving direction of the lens cover with a first gear fixed to the lens cover. A second gear fixed to the body frame side, a second gear provided to face the first gear, and a second gear movably disposed in the same direction as the lens cover;
A slide member that moves in an arc shape having a planetary gear meshing with the first gear and the second gear, respectively, and the slide member is electrically moved to move the lens cover through the planetary gear and the first gear. Motor driving means for moving between a front position of the photographing lens and a retracted position retracted from the photographing lens, a power transmitting means for transmitting a driving force from the motor to the slide member; A safety mechanism incorporated in the means, wherein the two gears are rotatably disposed on a support shaft, respectively, and are disposed on the support shaft to transmit a rotational driving force between the two gears. Electric driving means having a safety mechanism comprising a coil spring, and the first gear, the second gear, the slide member, and the electric driving means are each provided with a moving mechanism of the lens cover. It is characterized in that provided in the jet. Further, the electric drive means is a safety mechanism incorporated in the power transmission means, wherein the electric drive means has a safety mechanism including a gear attached to a spindle with a predetermined frictional force.
【０００７】[0007]
【作用】本発明によれば、前記駆動手段によって前記ス
ライド部材を移動させると、スライド部材の移動にとも
なってスライド部材に設けられた遊星ギアが第２のギア
によって回転させられる。従って、この遊星ギアに噛み
合う第１のギア（レンズカバー）は遊星ギアに対して遊
星ギアの回転量だけ相対的に移動する。即ち、レンズカ
バーは、スライド部材の移動と遊星ギアの回転とによっ
てスライド部材の移動量の約２倍移動するようになる。According to the present invention, when the slide member is moved by the driving means, the planetary gear provided on the slide member is rotated by the second gear with the movement of the slide member. Therefore, the first gear (lens cover) that meshes with the planetary gear moves relatively to the planetary gear by the rotation amount of the planetary gear. That is, the lens cover moves about twice the moving amount of the slide member due to the movement of the slide member and the rotation of the planetary gear.
【０００８】従って、レンズカバーに設けられる第１の
ギアの長さがレンズカバーより短くても、レンズカバー
の開閉に必要な移動量が得られ、レンズカバーの移動シ
ルエット内にその機構が内蔵でき、よりコンパクトな機
構になる。Accordingly, even if the length of the first gear provided on the lens cover is shorter than the length of the lens cover, the amount of movement required for opening and closing the lens cover can be obtained, and the mechanism can be built in the movement silhouette of the lens cover. , Resulting in a more compact mechanism.
【０００９】[0009]
【実施例】以下添付図面に従って本発明に係るレンズカ
バーの開閉機構の好ましい実施例を詳述する。図１及び
図２はそれぞれ本発明に係るレンズカバーの開閉機構の
一実施例を示す図で、図１はレンズカバー開状態の場合
に関して示しており、図２はレンズカバー閉状態に関し
て示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lens cover opening / closing mechanism according to the present invention will be described below in detail with reference to the accompanying drawings. FIGS. 1 and 2 show an embodiment of a lens cover opening / closing mechanism according to the present invention. FIG. 1 shows a case where the lens cover is open, and FIG. 2 shows a case where the lens cover is closed. .
【００１０】レンズカバー１０は、フレーム２０に形成
されたガイドレール２２等によって図示しない撮影レン
ズから退避する退避位置（レンズカバー開状態）と撮影
レンズの前面位置（レンズカバー閉状態）との間で移動
自在に配設されている。また、レンズカバー１０には歯
がレンズカバー１０の移動方向に沿うギア１２が設けら
れている。The lens cover 10 is moved between a retracted position (lens cover open state) for retracting from a photographing lens (not shown) by a guide rail 22 or the like formed on the frame 20 and a front position (lens cover closed state) of the photographing lens. It is arranged movably. The lens cover 10 is provided with a gear 12 whose teeth extend in the moving direction of the lens cover 10.
【００１１】一方、フレーム２０には、レンズカバー１
０のギア１２に対峙するギア２４が設けられている。ま
た、フレーム２０にはガイド溝２６が形成され、このガ
イド溝２６によってスライド部材３０が移動自在に案内
されている。上記スライド部材３０にはラック４０から
駆動力が加えられるピン３２が植設されるとともに、前
記ギア１２及びギア２４にそれぞれ噛み合う遊星ギア３
４が配設されている。On the other hand, the lens cover 1 is
A gear 24 facing the 0 gear 12 is provided. A guide groove 26 is formed in the frame 20, and the slide member 30 is movably guided by the guide groove 26. A pin 32 to which a driving force is applied from a rack 40 is implanted in the slide member 30, and the planetary gear 3 meshes with the gears 12 and 24, respectively.
4 are provided.
【００１２】ラック４０は前記ピン３２に駆動力を伝達
するための連結部材４２を有し、後述するよにラック４
０が左右方向に移動すると、連結部材４２及びピン３２
を介してスライド部材３０に駆動力が伝達される。これ
により、スライド部材３０はガイド溝２６に案内されて
移動する。尚、スライド部材３０は円弧状に移動するよ
うに案内されているが、連結部材４２には長孔４２Ａが
形成されているため、この長孔４２Ａを介してピン３２
に駆動力を伝達することができる。The rack 40 has a connecting member 42 for transmitting a driving force to the pins 32.
When 0 moves in the left-right direction, the connecting member 42 and the pin 32
The driving force is transmitted to the slide member 30 via the. Thereby, the slide member 30 moves while being guided by the guide groove 26. Although the slide member 30 is guided to move in an arc shape, since the connecting member 42 has an elongated hole 42A, the pin 32 is inserted through the elongated hole 42A.
The driving force can be transmitted to the motor.
【００１３】スライド部材３０が上記のようにして移動
させられると、スライド部材３０に設けられた遊星ギア
３４は、フレーム２０に設けられたギア２４によって回
転させられる。この遊星ギア３４の回転は、ギア１２、
即ちレンズカバー１０に伝達され、レンズカバー１０を
遊星ギア３４に対して移動させる。即ち、ラック４０に
よってスライド部材３０が移動させられると、レンズカ
バー１０はこのスライド部材３０の移動と遊星ギア３４
の回転とによってスライド部材３０の移動量の約２倍移
動することができる。これにより、レンズカバー１０に
設けられるギア１２の長さ等が短くてもレンズカバー１
０をその開閉に必要な移動量だけ移動させることがで
き、レンズカバー１０の移動シルエット内に駆動機構を
内蔵することができる。When the slide member 30 is moved as described above, the planetary gear 34 provided on the slide member 30 is rotated by the gear 24 provided on the frame 20. The rotation of this planetary gear 34
That is, the light is transmitted to the lens cover 10 and moves the lens cover 10 with respect to the planetary gear 34. That is, when the slide member 30 is moved by the rack 40, the lens cover 10 moves the slide member 30 and the planetary gear 34.
, The slide member 30 can move about twice as much as the moving amount. Thus, even if the length of the gear 12 provided on the lens cover 10 is short, the lens cover 1
The lens cover 10 can be moved by a moving amount necessary for opening and closing, and a driving mechanism can be built in the moving silhouette of the lens cover 10.
【００１４】図３は図２に示したレンズカバーの開閉機
構の平面図であり、前記ラック４０を移動させる駆動系
が詳細に示されている。同図に示すように、モータ５０
からウォーム５１、ギア５１〜５７を介してラック４０
に駆動力が伝達される。これによりラック４０が図３上
で左右方向に移動させられ、前述したようにレンズカバ
ー１０が開閉させられる。FIG. 3 is a plan view of the lens cover opening / closing mechanism shown in FIG. 2, and shows a drive system for moving the rack 40 in detail. As shown in FIG.
From the rack 40 via the worm 51 and the gears 51 to 57.
The driving force is transmitted to the motor. Thereby, the rack 40 is moved in the left-right direction in FIG. 3, and the lens cover 10 is opened and closed as described above.
【００１５】図４は図３のモータ５０からラック４０ま
でのギア列を直線状に配列した図である。同図に示すよ
うに、モータ５０の回転はウォーム５１、ギア５１〜５
５を介して減速され、ギア５６Ａに伝達される。ギア５
６Ａの回転は軸５６Ｂを介してこの軸５６Ｂに対して所
定の摩擦力をもって取り付けられたギア５６Ｃに伝達さ
れる。そして、ギア５６Ｃの回転はギア５７Ａに伝達さ
れ、コイルバネ５７Ｂを介して同軸上に設けられたギア
５７Ｃに伝達され、更にこのギア５７Ｃを介してラック
４０に伝達される。FIG. 4 is a diagram in which gear trains from the motor 50 to the rack 40 in FIG. 3 are linearly arranged. As shown in the drawing, the rotation of the motor 50 is controlled by the worm 51 and the gears 51 to 5.
5, and is transmitted to the gear 56A. Gear 5
The rotation of 6A is transmitted via a shaft 56B to a gear 56C attached to the shaft 56B with a predetermined frictional force. The rotation of the gear 56C is transmitted to the gear 57A, transmitted to the coaxially provided gear 57C via the coil spring 57B, and further transmitted to the rack 40 via the gear 57C.
【００１６】上記構成のギア列によれば、レンズカバー
１０が閉じた状態で外部からの力によってレンズカバー
１０を開けようとすると、ラック４０を介してギア５７
Ｃが回転させられるが、ギア５７Ａはギア５６Ｃによっ
て回転不能になっているため、コイルバネ５７Ｂにギア
５７Ｃの回転量が吸収される。従って、レンズカバー１
０から外力が取り除かれると、コイルバネ５７Ｂに蓄え
られた回転力によってレンズカバー１０は閉じられる。According to the gear train having the above-described structure, when the lens cover 10 is to be opened by an external force while the lens cover 10 is closed, the gear 57 is connected via the rack 40.
C is rotated, but since the gear 57A cannot be rotated by the gear 56C, the amount of rotation of the gear 57C is absorbed by the coil spring 57B. Therefore, the lens cover 1
When the external force is removed from 0, the lens cover 10 is closed by the rotational force stored in the coil spring 57B.
【００１７】一方、レンズカバー１０にコイルバネ５７
Ｂで吸収できる回転量以上（軸５６Ｂに対するギア５６
Ｃの所定の摩擦力以上）の外力が加えられると、ギア５
６Ｃが回転し、ギア列に過大な外力が加わらないように
している。On the other hand, a coil spring 57 is provided on the lens cover 10.
B or more (the gear 56 with respect to the shaft 56B)
When an external force (not less than the predetermined frictional force of C) is applied, the gear 5
6C rotates to prevent excessive external force from being applied to the gear train.
【００１８】[0018]
【発明の効果】以上説明したように本発明に係るレンズ
カバーの開閉機構によれば、スライド部材の移動と遊星
ギアの回転とによってスライド部材の移動量に対してレ
ンズカバーを約２倍移動させることができる。これによ
り、よりコンパクトな駆動機構によってスライド式のレ
ンズカバーを電動で開閉することができ、レンズカバー
の移動シルエット内にその機構を内蔵することができ
る。As described above, according to the lens cover opening / closing mechanism of the present invention, the movement of the slide member and the rotation of the planetary gear cause the lens cover to move about twice the amount of movement of the slide member. be able to. Thus, the slide-type lens cover can be electrically opened and closed by a more compact drive mechanism, and the mechanism can be built in the moving silhouette of the lens cover.
【図１】本発明に係るレンズカバーの開閉機構の一実施
例を示す図で、レンズカバー開状態を示す図である。FIG. 1 is a view showing an embodiment of a lens cover opening / closing mechanism according to the present invention, showing a lens cover open state.
【図２】図１におけるレンズカバーを閉じた状態の図で
ある。FIG. 2 is a view showing a state in which a lens cover in FIG. 1 is closed.
【図３】図２に示したレンズカバーの開閉機構の平面図
である。FIG. 3 is a plan view of a lens cover opening / closing mechanism shown in FIG. 2;
【図４】図３のモータからラックまでのギア列を直線状
に配列した側面図である。4 is a side view in which gear trains from a motor to a rack in FIG. 3 are linearly arranged.
１０…レンズカバー １２、２４…ギア ２０…フレーム ３０…スライド部材 ３２…ピン ３４…遊星ギア ４０…ラック ４２…連結部材 ５０…モータ DESCRIPTION OF SYMBOLS 10 ... Lens cover 12, 24 ... Gear 20 ... Frame 30 ... Slide member 32 ... Pin 34 ... Planetary gear 40 ... Rack 42 ... Connecting member 50 ... Motor
Claims (2)
退避する退避位置との間で円弧状に移動自在に配設さ
れ、該撮影レンズを開閉するためのスライド式の１枚の
レンズカバーと、 前記レンズカバーに固定された第１のギアで、歯が前記
レンズカバーの移動方向に沿って形成された第１のギア
と、 本体フレーム側に固定された第２のギアで、前記第１の
ギアに対峙して設けられた第２のギアと、 前記レンズカバーと同方向に移動自在に配設され、それ
ぞれ前記第１のギア及び第２のギアに噛み合う遊星ギア
を有する円弧状に移動するスライド部材と、 前記スライド部材を電動で移動させ、前記遊星ギア及び
第１のギアを介して前記レンズカバーを前記撮影レンズ
の前面位置と撮影レンズから退避した退避位置との間で
移動させる電動駆動手段であって、モータと、該モータ
から前記スライド部材に駆動力を伝達する動力伝達手段
と、該動力伝達手段内に組み込まれた安全機構であっ
て、支軸上にそれぞれ回転自在に配設された２つのギア
と、前記支軸上に配設され、前記２つのギア間における
回転駆動力を伝達するコイルバネとからなる安全機構と
を有する電動駆動手段と、を備え、 前記第１のギア、第２のギア、スライド部材及び電動駆
動手段を、それぞれ前記レンズカバーの移動シルエット
内に設けたことを特徴とするレンズカバーの開閉機構。1. A slide-type single lens cover that is movably disposed in an arc shape between a front position of a taking lens and a retracted position that retreats from the taking lens, and that opens and closes the taking lens. A first gear fixed to the lens cover, the first gear having teeth formed along a moving direction of the lens cover; and a second gear fixed to the body frame side, the first gear A second gear provided facing the gear; and a second gear movably disposed in the same direction as the lens cover, and moving in an arc shape having a planetary gear meshing with the first gear and the second gear, respectively. An electric drive for electrically moving the slide member and for moving the lens cover between the front position of the photographing lens and the retracted position retracted from the photographing lens via the planetary gear and the first gear; A stage, and a motor, the motor
Power transmission means for transmitting a driving force from the slide member to the slide member
And a safety mechanism incorporated in the power transmission means.
And two gears respectively rotatably arranged on the support shaft
And disposed on the support shaft, between the two gears
A safety mechanism consisting of a coil spring that transmits rotational driving force;
An opening and closing mechanism for the lens cover, wherein the first gear, the second gear, the slide member, and the electric driving unit are provided in a moving silhouette of the lens cover, respectively. .
内に組み込まれた安全機構であって、所定の摩擦力をも
って支軸に取り付けられたギアからなる安全機構を有す
ることを特徴とする請求項１のレンズカバーの開閉機
構。 Wherein said electric driving means, said a power transmission means safety mechanism incorporated within, claims, characterized in that it comprises a safety mechanism comprising a gear mounted on the shaft with a predetermined frictional force Item 2. A lens cover opening / closing mechanism according to Item 1 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03001013A JP3083104B2 (en) | 1991-01-09 | 1991-01-09 | Lens cover opening and closing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03001013A JP3083104B2 (en) | 1991-01-09 | 1991-01-09 | Lens cover opening and closing mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04251231A JPH04251231A (en) | 1992-09-07 |
| JP3083104B2 true JP3083104B2 (en) | 2000-09-04 |
Family
ID=11489694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03001013A Expired - Lifetime JP3083104B2 (en) | 1991-01-09 | 1991-01-09 | Lens cover opening and closing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3083104B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS581925U (en) * | 1981-06-26 | 1983-01-07 | 富士写真光機株式会社 | Camera with protective lid |
| JPS61107226A (en) * | 1984-10-30 | 1986-05-26 | Canon Inc | Camera with lens cover |
| JPS61196229U (en) * | 1985-05-29 | 1986-12-06 | ||
| JPH02142826U (en) * | 1989-04-29 | 1990-12-04 |
-
1991
- 1991-01-09 JP JP03001013A patent/JP3083104B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04251231A (en) | 1992-09-07 |
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