JPH0572598A - Light quantity adjusting device - Google Patents
Light quantity adjusting deviceInfo
- Publication number
- JPH0572598A JPH0572598A JP25964891A JP25964891A JPH0572598A JP H0572598 A JPH0572598 A JP H0572598A JP 25964891 A JP25964891 A JP 25964891A JP 25964891 A JP25964891 A JP 25964891A JP H0572598 A JPH0572598 A JP H0572598A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- lens barrel
- holding member
- light quantity
- optical axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Exposure Control For Cameras (AREA)
- Blocking Light For Cameras (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は例えばビデオカメラ用交
換レンズにおいて、透過率が連続的に変化するフィルタ
を光軸上に駆動源により移動して、自動的に光量調整を
行う光量調整装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light amount adjusting device for automatically adjusting a light amount in a interchangeable lens for a video camera, for example, by moving a filter whose transmittance changes continuously on the optical axis by a driving source. It is a thing.
【0002】[0002]
【従来の技術】図9は従来のビデオカメラ用交換レンズ
のレンズ鏡筒を示す縦断面図である。この図8におい
て、1はカメラ本体(図示せず)に取り付けるマウン
ト、2はマウント1をネジ17で取り付けた固定部材、
3は先端外周にネジ部3aを後端外周に固定部材2のネ
ジ部2aと螺合するネジ部3bを有する鏡筒、4は合焦
用レンズ6を保持し鏡筒3のネジ部3aにネジ結合する
た距離環、5はシャ光部材、7は鏡筒3に保持したレン
ズ群、8は固定部材2に保持したレンズ群、14は固定
部材2内に設けた基板、14a,14bは基板14に取
付けられ、カメラ本体と通信を行う制御回路である。2. Description of the Related Art FIG. 9 is a vertical sectional view showing a lens barrel of a conventional interchangeable lens for a video camera. In FIG. 8, 1 is a mount to be attached to the camera body (not shown), 2 is a fixing member to which the mount 1 is attached with screws 17,
Reference numeral 3 designates a lens barrel having a threaded portion 3a on the outer periphery of the front end and threaded portion 3b on the outer periphery of the rear end which is screwed with the screw portion 2a of the fixing member 2; A distance ring screwed together, 5 is a light member, 7 is a lens group held by the lens barrel 3, 8 is a lens group held by the fixing member 2, 14 is a substrate provided in the fixing member 2, and 14a and 14b are The control circuit is attached to the board 14 and communicates with the camera body.
【0003】上記構成のレンズ鏡筒をカメラ本体に取付
けることにより、マウント1に設けた接点1aを通じ
て、前記レンズ鏡筒と前記カメラ本体とが電気的に接続
され、両者間でデータ通信を行うことができる。By attaching the lens barrel having the above structure to the camera body, the lens barrel and the camera body are electrically connected to each other through the contacts 1a provided on the mount 1, and data communication can be performed between them. You can
【0004】この結果、カメラ本体は取付けられている
レンズ鏡筒からのデータによって該レンズ鏡筒を識別し
て正しく作動し、また、レンズ鏡筒はカメラ本体からデ
ータに基づいて不図示の駆動源で距離環4を回すことで
合焦動作を行うことが可能である。As a result, the camera body discriminates the lens barrel based on the data from the attached lens barrel to operate correctly, and the lens barrel is driven from the camera body based on the data and is not shown in the drive source. It is possible to perform a focusing operation by rotating the distance ring 4 with.
【0005】そして、前述のようなレンズ鏡筒では、面
積変化による光量調整がむずかしいため、図9に示すよ
うな光量調整用フィルタ(通常、NDフィルタという)
30aを保持したリング30を、距離環4の前端内周面
のネジ部4aにネジ結合して光量調整を行っている。In the lens barrel as described above, it is difficult to adjust the light quantity due to the change in area, and therefore, the light quantity adjusting filter as shown in FIG. 9 (usually called an ND filter).
The ring 30 holding 30a is screwed to the screw portion 4a on the inner peripheral surface of the front end of the distance ring 4 to adjust the light amount.
【0006】[0006]
【発明が解決しようとしている課題】しかしながら、上
記のような従来例では、ビデオカメラで撮影中に適正な
透過率のフィルタ30aを選択交換することは、操作上
非常にむずかしいため、その交換に気を取られて撮影チ
ャンスをのがしてしまうというおそれがある。However, in the above-described conventional example, it is very difficult in operation to selectively replace the filter 30a having an appropriate transmittance while the video camera is shooting, and therefore the replacement is not recommended. There is a risk that it will be taken and the shooting opportunity will be lost.
【0007】図10は、従来の他のレンズ鏡筒を示す縦
断面図である。図10において、40は光量調整用フィ
ルタ40aの保持枠である。この保持枠40を固定部材
2の上面に形成した穴2bから挿入して、フィルタ40
aを光軸上に位置させる構成であって、フィルタ40a
の交換を容易、かつ、迅速に行うことができる。しか
し、多数のフィルタを準備する必要があり、しかも、ど
のフィルタを使用するか決定することが非常に困難であ
る。FIG. 10 is a vertical sectional view showing another conventional lens barrel. In FIG. 10, reference numeral 40 denotes a holding frame of the light quantity adjusting filter 40a. The holding frame 40 is inserted through the hole 2b formed in the upper surface of the fixing member 2 to remove the filter 40
a is located on the optical axis, and the filter 40a
Can be replaced easily and quickly. However, it is necessary to prepare a large number of filters, and it is very difficult to decide which filter to use.
【0008】また、撮影中にフィルタを入れ替えること
は画面上にチラッキや明るさの変化(フリッカ)が生
じ、非常に見苦しいという問題点があった。Further, when the filters are exchanged during photographing, there is a problem that flicker and brightness change (flicker) occur on the screen, which is very unsightly.
【0009】本発明はカメラ本体からのデータに基づい
てフィルタの透過率を変更し、適正な光量と得ることの
できる光量調整装置の提供を目的とする。It is an object of the present invention to provide a light quantity adjusting device capable of changing the transmittance of a filter on the basis of data from a camera body to obtain an appropriate light quantity.
【0010】[0010]
【課題を解決するための手段】本発明は下記のような構
成を特徴とする光量調整装置である。 (1)連続的に透過率が変化するフィルタを保持したフ
ィルタ保持部材を該フィルタが光軸上を移動するように
鏡筒内に回転自在に設け、この鏡筒を組み付けたカメラ
本体からの情報により前記フィルタ保持部材を回転駆動
して適正な光量が得られるように光軸上のフィルタの透
過率を変更する駆動源とを備え、前記カメラ本体の電源
が投入されて撮影状態になったときは前記フィルタ保持
部材を回転駆動して光量調整動作を行うことにより、適
正な光量を得ることができる。 (2)透過率が対数的に変化するフィルタを備えたこと
により、対数的に光量調整を行っているシステムのカメ
ラに適用して、制御性のよい光量調整を行うことができ
る。The present invention is a light quantity adjusting device characterized by the following configurations. (1) A filter holding member that holds a filter whose transmittance changes continuously is rotatably provided inside the lens barrel so that the filter moves on the optical axis, and information from the camera body with this lens barrel assembled. And a drive source for changing the transmittance of the filter on the optical axis so as to obtain an appropriate amount of light by rotationally driving the filter holding member, and when the camera body is powered on and is in a shooting state. By rotating the filter holding member to perform a light amount adjusting operation, an appropriate light amount can be obtained. (2) Since the filter whose transmittance changes logarithmically is provided, it can be applied to a camera of a system that logarithmically adjusts the light quantity, and the light quantity can be adjusted with good controllability.
【0011】[0011]
【実施例】以下、本発明の実施例を図面について説明す
る。図1乃至図3は本発明の特徴を最もよく表わす図面
であり、図1は本発明レンズ鏡筒の断面図、図2は図1
のA−A線に沿う横断面図、図3はレンズ鏡筒19とカ
メラ本体20とのデータ通信系統を示す概略図である。
図1乃至図3において、1はマウント、2は固定部材、
3は鏡筒、4は距離環、5はシャ光部材、6は合焦用レ
ンズ、7,8はレンズ群であり、これ等は前記図7に示
す従来のレンズ鏡筒と同一であるから同一符合を付して
重複説明を省略する。Embodiments of the present invention will now be described with reference to the drawings. 1 to 3 are drawings that best show the features of the present invention. FIG. 1 is a sectional view of the lens barrel of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along line AA of FIG. 3, and FIG. 3 is a schematic view showing a data communication system between the lens barrel 19 and the camera body 20.
1 to 3, 1 is a mount, 2 is a fixing member,
Reference numeral 3 is a lens barrel, 4 is a distance ring, 5 is a light member, 6 is a focusing lens, and 7 and 8 are lens groups, which are the same as the conventional lens barrel shown in FIG. The same reference numerals are given and duplicate description is omitted.
【0012】10はリング状のフィルタ保持部材であ
り、このフィルタ保持部材10は外周にギア部10aを
有し連続的に透過率が変化するフィルタ9(一般にND
フィルタ)を保持し、このフィルタ9の回転軌跡が光軸
と一致するように軸15で回転自在に固定部材2に取付
けられている。11はフィルタ保持部材10の外周部に
はりつけられたパターン16a,16bを接触片11
a,11bで検出するブラシ、12はギア12a,13
を介して、フィルタ保持部材10を駆動するモータであ
る。Reference numeral 10 denotes a ring-shaped filter holding member. This filter holding member 10 has a gear portion 10a on the outer periphery thereof and has a filter 9 (generally ND) whose transmittance changes continuously.
A filter) is held, and the filter 9 is rotatably attached to the fixed member 2 by a shaft 15 so that the rotation locus of the filter 9 coincides with the optical axis. Reference numeral 11 denotes the contact pieces 11 having the patterns 16a and 16b attached to the outer peripheral portion of the filter holding member 10.
Brushes detected by a and 11b, 12 is gears 12a and 13
It is a motor that drives the filter holding member 10 via.
【0013】14はねじ27で固定部材2に取付けられ
た基板であり、この基板14は上記ブラシ11、モータ
12を裏面に保持し、その表面にはカメラ本体20から
の信号およびブラシ11からのパターン検出信号を処理
し、モータ12を駆動制御する制御回路14a,14b
が設けられている。Reference numeral 14 denotes a substrate attached to the fixing member 2 with a screw 27. The substrate 14 holds the brush 11 and the motor 12 on the back surface, and a signal from the camera body 20 and a signal from the brush 11 are provided on the front surface. Control circuits 14a and 14b for processing the pattern detection signal and controlling the drive of the motor 12
Is provided.
【0014】以上の構成によるレンズ鏡筒19をカメラ
本体20にマウント1により組み付けると、両者はレン
ズ鏡筒19側の接点1aとカメラ本体20側の接点20
aとにより電気的に接続される。この接続状態で電源ス
イッチ17を作動させて撮影状態とすると、カメラ本体
20とレンズ鏡筒19は相互でデータ通信を開始する。When the lens barrel 19 having the above-described structure is assembled to the camera body 20 by the mount 1, both are attached to the contact 1a on the lens barrel 19 side and the contact 20 on the camera body 20 side.
It is electrically connected by a. When the power switch 17 is operated in this connection state to enter the photographing state, the camera body 20 and the lens barrel 19 start mutual data communication.
【0015】そして、カメラ本体20側の制御回路28
はレンズ鏡筒19を通ってCCD27に収光する光量に
応じて適正露出かを判断し、不適当な場合はレンズ鏡筒
19内の制御回路14aに制御命令を送る。このため、
制御回路14aは入力された制御命令に基づいてモータ
12をどの方向に回転させるか判断し、モータ12に駆
動信号を供給すると同時にパターン16a,16bの検
出信号に基づいて適正な透過率のフィルタ位置を光軸上
に停止させる。これにより、カメラ本体20側において
適正光量が得られる。The control circuit 28 on the camera body 20 side
Determines whether the exposure is proper according to the amount of light collected by the CCD 27 through the lens barrel 19, and sends a control command to the control circuit 14a in the lens barrel 19 when the exposure is inappropriate. For this reason,
The control circuit 14a determines in which direction the motor 12 should be rotated based on the input control command, supplies a drive signal to the motor 12, and at the same time, based on the detection signals of the patterns 16a and 16b, the filter position of the proper transmittance. Stop on the optical axis. As a result, an appropriate amount of light can be obtained on the camera body 20 side.
【0016】以下、上記連続的に透過率の変化するフィ
ルタ9の具体的な作成方法について説明する。図4は加
工状態を示す斜視図であり、図4において、21は端面
21aが回転角θとともに長手方向Lの厚さが変化する
治具であり、フィルタ素子9aを上記治具21の端面2
1aに接着した後、このフィルタ素子9aの端面を平面
となる様研磨する。A specific method of producing the filter 9 whose transmittance changes continuously will be described below. FIG. 4 is a perspective view showing a processed state. In FIG. 4, reference numeral 21 denotes a jig whose end face 21a changes in thickness in the longitudinal direction L with the rotation angle θ, and the filter element 9a is attached to the end face 2 of the jig 21.
After adhering to 1a, the end surface of this filter element 9a is polished to be a flat surface.
【0017】図5は横軸に回転角θ、縦軸に厚さを示す
図であり、図4に示すように研磨が行われたフィルタ素
子9aおよび同様の加工を行った完全透過のガラス素子
9bが図示されている。このフィルタ素子9aおよびガ
ラス素子9bを図6に示すように重ね合せて接着するこ
とにより、光路長を変化させることなく、回転角θに従
って連続的に透過率が変化するフィルタ9を作成するこ
とができる。FIG. 5 is a diagram showing the rotation angle θ on the horizontal axis and the thickness on the vertical axis. As shown in FIG. 4, the polished filter element 9a and the similar-processed completely transmissive glass element are shown. 9b is shown. By superposing and adhering the filter element 9a and the glass element 9b on each other as shown in FIG. 6, it is possible to form the filter 9 in which the transmittance continuously changes according to the rotation angle θ without changing the optical path length. it can.
【0018】図7は他のフィルタ作成方法の説明図であ
り、図7において、22は中心の穴23に通した軸(図
示せず)を中心に回転する円板であり、この円板22に
回転方向に順次、穴径を変化させて、多数の大、小の穴
部22a,22bを設けたものである。FIG. 7 is an explanatory view of another method for producing a filter. In FIG. 7, 22 is a circular plate which rotates around an axis (not shown) passing through a central hole 23. In addition, a large number of large and small hole portions 22a and 22b are provided by sequentially changing the hole diameter in the rotation direction.
【0019】この円板22を図1に示すフィルタ9と入
れ換えることで連続的光量調整を行うことができる。
尚、穴径を変えず、穴の数を変化させてもよい。By replacing the disc 22 with the filter 9 shown in FIG. 1, continuous light quantity adjustment can be performed.
The number of holes may be changed without changing the hole diameter.
【0020】また、ビデオカメラ、スチールカメラにお
ける光学系の光量調整は変化する割合が一定の比になる
ような制御が多く、一般に等間隔絞りと呼ばれている。
このような対数的な光量調整を行っているシステムに
は、前述のフィルタ9または円板22による光量調整機
構は制御上マッチングが悪い。Further, in the adjustment of the light amount of the optical system in the video camera and the still camera, there are many controls such that the changing rate becomes a constant ratio, and it is generally called an equal-interval stop.
In such a system that performs logarithmic light amount adjustment, the above-described light amount adjusting mechanism using the filter 9 or the disk 22 has poor matching in terms of control.
【0021】しかし、前述のフィルタ9を回転方向と透
過率の変化が対数的に変化するように作ることにより、
制御性よく、ミラーレンズの光量調整を行うことができ
る。However, by making the above-mentioned filter 9 so that the rotation direction and the change in transmittance change logarithmically,
The light amount of the mirror lens can be adjusted with good controllability.
【0022】そこで、前記図4に示す治具21として、
その端面21aの厚さの変化量tが回転角θに対して対
数的に変化する治具を用いることにより、図8に示すよ
うなフィルタ素子9a−1および逆対数的に厚さの変化
するガラス素子9b−1を作成し、重ね合せて接着して
フィルタ9を作成する。Therefore, as the jig 21 shown in FIG.
By using a jig whose change amount t of the thickness of the end face 21a changes logarithmically with respect to the rotation angle θ, the filter element 9a-1 as shown in FIG. 8 and the thickness change antilogarithmically. The glass element 9b-1 is prepared, and the filter 9 is prepared by stacking and adhering the glass element 9b-1.
【0023】また、前記図7に示す円板22に形成する
大、小の穴22a,22bの数または穴径を対数的に変
化させることは容易に考えられる。Further, it is easily conceivable to change the number or the diameter of the large and small holes 22a and 22b formed in the disk 22 shown in FIG. 7 logarithmically.
【0024】なお、フィルタ保持部材10の駆動源とし
ては、DCモータ12、ステッピングモータの他、振動
波を用いたモータや、プランジャーを用いても良い。As the drive source of the filter holding member 10, a DC motor 12, a stepping motor, a motor using a vibration wave, or a plunger may be used.
【0025】また、フィルタ保持部材10の位置検出手
段は、上記実施例ではパターンとブラシであるが、光学
式、磁気式、静電式などであってもよい。この場合位置
検出のビット数を増して、フィルタ保持部材10の絶対
位置を検知したり、フィルタ保持部材10の回転に合せ
てパルス信号を発生させることは容易に考えられる。Further, the position detecting means of the filter holding member 10 is a pattern and a brush in the above embodiment, but may be an optical type, a magnetic type, an electrostatic type or the like. In this case, it is easily conceivable to increase the number of bits for position detection to detect the absolute position of the filter holding member 10 or to generate a pulse signal according to the rotation of the filter holding member 10.
【0026】[0026]
【発明の効果】以上説明したように、本発明によれば、
連続的に透過率の変化するフィルタを保持したフィルタ
保持部材を鏡筒内に該フィルタが光軸上に位置するよう
に回転自在に設け、この鏡筒を組み付けたカメラ本体か
らの情報に基ずいてフィルタ保持部材を回転駆動して、
適正な光量となるフィルタ位置を光軸上に位置させるよ
うに構成したので、自動的に適正露出に設定することを
容易にできる。また透過率が対数的に変化するフィルタ
を用いるので、対数的に光量調整を行なうシステムのカ
メラに適用して、制御性のよい光量調整を行うことがで
きる等の効果がある。As described above, according to the present invention,
A filter holding member that holds a filter whose transmittance changes continuously is provided rotatably in the lens barrel so that the filter is located on the optical axis, and based on information from the camera body with this lens barrel assembled. Rotation drive the filter holding member,
Since the filter position that provides an appropriate amount of light is located on the optical axis, it is easy to automatically set the appropriate exposure. Further, since a filter whose transmittance changes logarithmically is used, there is an effect that it can be applied to a camera of a system that logarithmically adjusts the light amount to perform the light amount adjustment with good controllability.
【図1】本発明の一実施例の縦断面図。FIG. 1 is a vertical sectional view of an embodiment of the present invention.
【図2】図1のA−A線に沿う横断面図。FIG. 2 is a cross-sectional view taken along the line AA of FIG.
【図3】レンズ鏡筒とカメラ本体とのデータ通信系統を
示す概略図。FIG. 3 is a schematic diagram showing a data communication system between a lens barrel and a camera body.
【図4】フィルタの作成方法を説明するフィルタ素子お
よび治具の斜視図。FIG. 4 is a perspective view of a filter element and a jig for explaining a filter manufacturing method.
【図5】作成途中のフィルタ素子およびガラス素子の横
断面図。FIG. 5 is a cross-sectional view of the filter element and the glass element in the process of being formed.
【図6】作成後のフィルタの横断面図。FIG. 6 is a cross-sectional view of the filter after being created.
【図7】他のフィルタの作成方法を説明する円板の正面
図。FIG. 7 is a front view of a disc for explaining another method for producing a filter.
【図8】フィルタの更に他の作成方法を説明する作成途
中のフィルタ素子およびガラス素子の横断面図。FIG. 8 is a transverse cross-sectional view of a filter element and a glass element in the process of preparation for explaining another method of manufacturing a filter.
【図9】従来の光量調整装置を備えたレンズ鏡筒の縦断
面図。FIG. 9 is a vertical cross-sectional view of a lens barrel including a conventional light amount adjusting device.
【図10】従来の他の光量調整装置を備えたレンズ鏡筒
の縦断面図。FIG. 10 is a vertical cross-sectional view of a lens barrel including another conventional light amount adjusting device.
【符号の説明】 3 鏡筒 9 フィルタ 10 フィルタ保持部材 12 モータ(駆動源) 19 レンズ鏡筒 20 カメラ本体[Explanation of reference numerals] 3 lens barrel 9 filter 10 filter holding member 12 motor (driving source) 19 lens barrel 20 camera body
Claims (2)
持したフィルタ保持部材を該フィルタが光軸上を移動す
るように鏡筒内に回転自在に設け、この鏡筒を組み付け
たカメラ本体からの情報により前記フィルタ保持部材を
回転駆動して適正な光量が得られるように光軸上のフィ
ルタの透過率を変更する駆動源とを備え、前記カメラ本
体の電源が投入されて撮影状態になったときは前記フィ
ルタ保持部材を回転駆動して光量調整動作を行うことを
特徴とする光量調整装置。1. A filter holding member, which holds a filter whose transmittance changes continuously, is rotatably provided in a lens barrel so that the filter moves on the optical axis, and from a camera body to which this lens barrel is assembled. Drive source for changing the transmittance of the filter on the optical axis so that an appropriate amount of light can be obtained by rotationally driving the filter holding member according to the information of 1. In this case, the filter holding member is rotationally driven to perform a light amount adjusting operation.
えたことを特徴とする請求項1記載の光量調整装置。2. The light amount adjusting device according to claim 1, further comprising a filter whose transmittance changes logarithmically.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25964891A JPH0572598A (en) | 1991-09-11 | 1991-09-11 | Light quantity adjusting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25964891A JPH0572598A (en) | 1991-09-11 | 1991-09-11 | Light quantity adjusting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0572598A true JPH0572598A (en) | 1993-03-26 |
Family
ID=17336971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP25964891A Pending JPH0572598A (en) | 1991-09-11 | 1991-09-11 | Light quantity adjusting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0572598A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7932952B2 (en) | 2001-10-12 | 2011-04-26 | Canon Kabushiki Kaisha | Light quantity adjusting device, optical system having the same, and image taking apparatus |
WO2013137156A1 (en) * | 2012-03-13 | 2013-09-19 | 株式会社トプコン | Mechanism for adjusting amount of light |
-
1991
- 1991-09-11 JP JP25964891A patent/JPH0572598A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7932952B2 (en) | 2001-10-12 | 2011-04-26 | Canon Kabushiki Kaisha | Light quantity adjusting device, optical system having the same, and image taking apparatus |
WO2013137156A1 (en) * | 2012-03-13 | 2013-09-19 | 株式会社トプコン | Mechanism for adjusting amount of light |
JP2013190519A (en) * | 2012-03-13 | 2013-09-26 | Topcon Corp | Light amount adjustment mechanism |
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