JPH0553167A - Diaphragm adjusting device for camera lens - Google Patents

Diaphragm adjusting device for camera lens

Info

Publication number
JPH0553167A
JPH0553167A JP3237204A JP23720491A JPH0553167A JP H0553167 A JPH0553167 A JP H0553167A JP 3237204 A JP3237204 A JP 3237204A JP 23720491 A JP23720491 A JP 23720491A JP H0553167 A JPH0553167 A JP H0553167A
Authority
JP
Japan
Prior art keywords
diaphragm
lens
aperture
camera lens
converter
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
Application number
JP3237204A
Other languages
Japanese (ja)
Inventor
Akira Nakatani
亮 中谷
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP3237204A priority Critical patent/JPH0553167A/en
Publication of JPH0553167A publication Critical patent/JPH0553167A/en
Pending legal-status Critical Current

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  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To easily execute the fine adjustment of diaphragm in a required range when a cameraman needs to execute the fine adjustment of the diaphragm of the camera lens. CONSTITUTION:The output of a diaphragm adjustment amplifier 2 adjusted by a diaphragm adjustment volume 1 is sent to a CPU 4 through an AD converter 3, and is arithmetically calculated by using data on non-linear input/ output characteristic which are stored in a memory 5, then is returned to an analog signal by a DA converter 6, and is sent to a motor driving circuit 7. A motor 9 is driven by the motor driving circuit 7, and the diaphragm 8 of a lens is adjusted. Thus, a non-linear relation between positions of the diaphragm adjustment volume 1 and the diaphragm 8 of the lens is realized through this constitution.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、テレビジョンカメラや
スチルカメラ等に用いられるカメラレンズの絞り調整装
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 diaphragm adjusting device for a camera lens used in a television camera, a still camera or the like.

【0002】[0002]

【従来の技術】テレビジョンカメラ、スチルビデオカメ
ラ、スチルカメラ等におけるカメラの絞り調整ボリュー
ムとレンズの絞りとの関係は、通常では直線的である。
2. Description of the Related Art In a television camera, a still video camera, a still camera, etc., the relationship between the aperture adjustment volume of a camera and the aperture of a lens is usually linear.

【0003】[0003]

【発明が解決しようとする課題】解像度が実質的に最大
となるレンズの絞り値の付近で、絞りを細かく調整した
いとカメラマンが考えても、従来のカメラレンズの絞り
調整装置では、前述したように絞り調整ボリュームとレ
ンズの絞りの関係が直線的であるために、微調操作が困
難であるという欠点がある。
Even if the photographer wants to finely adjust the aperture in the vicinity of the aperture value of the lens at which the resolution is substantially maximized, the conventional camera lens aperture adjusting device has the above-described configuration. In addition, since the relationship between the diaphragm adjusting volume and the diaphragm of the lens is linear, there is a drawback that the fine adjustment operation is difficult.

【0004】本発明の目的は、任意の範囲において、容
易に微調操作を行うことのできるカメラレンズの絞り調
整装置を提供することにある。
It is an object of the present invention to provide a diaphragm adjusting device for a camera lens, which enables easy fine adjustment operation in an arbitrary range.

【0005】[0005]

【課題を解決するための手段】上述の目的を達成するた
めの本発明に係るカメラレンズの絞り調整装置は、絞り
調整用増幅器と絞りを動かす電動機駆動回路との間に、
非線形な入出力特性を持つ回路を設けたことを特徴とす
るものである。
To achieve the above object, a diaphragm adjusting device for a camera lens according to the present invention comprises a diaphragm adjusting amplifier and a motor driving circuit for moving the diaphragm.
It is characterized in that a circuit having a nonlinear input / output characteristic is provided.

【0006】[0006]

【作用】上述の構成を有するカメラレンズの絞り調整装
置は、絞り調整ボリュームによって調節される絞り調整
増幅器の出力を、非線形な入出力特性を持つ回路に送信
することによって、絞り調整増幅器と非線形な関係をも
つ信号を形成し、この信号を電動機駆動回路に入力する
ことによって、絞り調整ボリュームとレンズの絞りとの
関係を非線形にする。
The diaphragm adjusting device for a camera lens having the above-described structure transmits the output of the diaphragm adjusting amplifier adjusted by the diaphragm adjusting volume to a circuit having a nonlinear input / output characteristic so that the diaphragm adjusting amplifier is nonlinear. By forming a related signal and inputting this signal to the motor drive circuit, the relationship between the diaphragm adjustment volume and the lens diaphragm is made non-linear.

【0007】[0007]

【実施例】本発明を図示の実施例に基づいて詳細に説明
する。図1は本発明を適用したカメラレンズの絞り調整
装置のブロック回路構成図である。絞り調整ボリューム
1が取り付けられた絞り調整増幅器2の出力は、ADコ
ンバータ3を介してCPU4に接続されている。CPU
4には非線形な入出力特性のデータを記憶したメモリ5
が接続されており、またCPU4の出力はDAコンバー
タ6を介して電動機駆動回路7に接続されている。そし
て、電動機駆動回路7の出力はレンズの絞り8を動かす
電動機9に入力され、絞り8から絞りのデータが電動機
駆動回路7にフィードバックされるようになっている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a block circuit configuration diagram of a camera lens aperture adjustment device to which the present invention is applied. The output of the aperture adjustment amplifier 2 to which the aperture adjustment volume 1 is attached is connected to the CPU 4 via the AD converter 3. CPU
4 is a memory 5 storing data of nonlinear input / output characteristics
Are connected, and the output of the CPU 4 is connected to the electric motor drive circuit 7 via the DA converter 6. The output of the electric motor drive circuit 7 is input to the electric motor 9 that moves the diaphragm 8 of the lens, and the diaphragm data is fed back from the diaphragm 8 to the electric motor drive circuit 7.

【0008】絞り調整ボリューム1を動かすと、その抵
抗値と直線関係を有する線形のDC信号aが絞り調整増
幅器2から出力される。このDC信号はADコンバータ
3によってデジタルデータに変換されCPU4に入力さ
れる。このデジタルデータはCPU4において、メモリ
5に記憶されている入出力特性のデータに基づいて入力
と非線形なデジタルデータに変換され、その後にDAコ
ンバータ6によってDC信号bに変換される。DC信号
bは電動機駆動回路7に入力され、電動機駆動回路7は
レンズの絞り8がDC信号bと対応する値になるように
電動機9を駆動する。絞りの精度・安定度を高くするた
めに、絞り8から絞りデータが電動機駆動回路7にフィ
ードバックされる。
When the diaphragm adjusting volume 1 is moved, a linear DC signal a having a linear relationship with the resistance value is output from the diaphragm adjusting amplifier 2. This DC signal is converted into digital data by the AD converter 3 and input to the CPU 4. In the CPU 4, this digital data is converted into input and nonlinear digital data based on the input / output characteristic data stored in the memory 5, and then converted into a DC signal b by the DA converter 6. The DC signal b is input to the electric motor drive circuit 7, and the electric motor drive circuit 7 drives the electric motor 9 so that the diaphragm 8 of the lens has a value corresponding to the DC signal b. The diaphragm data is fed back from the diaphragm 8 to the motor drive circuit 7 in order to increase the accuracy and stability of the diaphragm.

【0009】メモリ5に記憶されている非線形な入出力
特性のデータは、例えば図2に示すようなものである。
これは入力信号がCの範囲にある場合において、絞り位
置の細かい調整を可能にしたものである。レンズの絞り
値Fとレンズの解像度の間には例えば図3に示すような
関係があるので、解像度が実質的に最大となる絞り値d
の付近の範囲に重なるように、図2のCの範囲を設定す
ることによって、解像度が最大になる絞り値付近で、絞
りを細かく調整することが可能となる。
The non-linear input / output characteristic data stored in the memory 5 is, for example, as shown in FIG.
This allows fine adjustment of the diaphragm position when the input signal is in the range C. Since there is a relationship between the aperture value F of the lens and the resolution of the lens as shown in FIG. 3, for example, the aperture value d at which the resolution is substantially maximized.
By setting the range of C in FIG. 2 so as to overlap with the range in the vicinity of, it becomes possible to finely adjust the aperture in the vicinity of the aperture value at which the resolution becomes maximum.

【0010】また、メモリ5に複数の入出力特性のデー
タを記憶させて、使用する特性のデータを選択できるよ
うにしたり、或いは絞りの微調整が可能な範囲と入出力
特性の傾きを変えられるようにすること等によって、カ
メラマンがレンズの種類、被写体の照度、自分の好み等
から判断して様々な入出力特性を使い分けることが可能
となる。
Further, a plurality of input / output characteristic data are stored in the memory 5 so that the characteristic data to be used can be selected, or the range in which the aperture can be finely adjusted and the inclination of the input / output characteristic can be changed. By doing so, it becomes possible for the cameraman to use various input / output characteristics depending on the type of lens, the illuminance of the subject, his / her preference, and the like.

【0011】なお、図1のADコンバータ3、CPU
4、メモリ5、DAコンバータ6の代りに、アナログ非
線形回路とする構成にしてもよい。この構成とすること
により回路規模を更に小型・軽量にすることができる。
The AD converter 3 and the CPU of FIG.
4, the memory 5 and the DA converter 6 may be replaced by an analog non-linear circuit. With this configuration, the circuit scale can be further reduced in size and weight.

【0012】[0012]

【発明の効果】以上説明したように本発明に係るカメラ
レンズの絞り調整装置は、レンズの絞り調整増幅器と電
動機駆動回路の間に非線形な入出力特性を持つ回路を設
けることにより、レンズの絞りを細かく調整する必要の
ある範囲において、容易に微調操作をすることができる
という利点がある。
As described above, the aperture adjusting device for a camera lens according to the present invention is provided with a circuit having a non-linear input / output characteristic between the aperture adjusting amplifier of the lens and the electric motor drive circuit. There is an advantage that the fine adjustment operation can be easily performed in the range where it is necessary to finely adjust.

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

【図1】実施例のブロック回路構成図である。FIG. 1 is a block circuit configuration diagram of an embodiment.

【図2】メモリに記憶されている非線形な入出力特性の
説明図である。
FIG. 2 is an explanatory diagram of a nonlinear input / output characteristic stored in a memory.

【図3】レンズの絞り値Fとレンズの解像度の特性の説
明図である。
FIG. 3 is an explanatory diagram of characteristics of a lens aperture value F and a lens resolution.

【符号の説明】[Explanation of symbols]

1 絞り調整ボリューム 2 絞り調整増幅器 3 ADコンバータ 4 CPU 5 メモリ 6 DAコンバータ 7 電動機駆動回路 8 絞り 9 電動機 1 Aperture Adjustment Volume 2 Aperture Adjustment Amplifier 3 AD Converter 4 CPU 5 Memory 6 DA Converter 7 Electric Motor Drive Circuit 8 Aperture 9 Electric Motor

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 絞り調整用増幅器と絞りを動かす電動機
駆動回路との間に、非線形な入出力特性を持つ回路を設
けたことを特徴とするカメラレンズの絞り調整装置。
1. An aperture adjustment device for a camera lens, wherein a circuit having a nonlinear input / output characteristic is provided between an aperture adjustment amplifier and a motor drive circuit for moving the aperture.
JP3237204A 1991-08-23 1991-08-23 Diaphragm adjusting device for camera lens Pending JPH0553167A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3237204A JPH0553167A (en) 1991-08-23 1991-08-23 Diaphragm adjusting device for camera lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3237204A JPH0553167A (en) 1991-08-23 1991-08-23 Diaphragm adjusting device for camera lens

Publications (1)

Publication Number Publication Date
JPH0553167A true JPH0553167A (en) 1993-03-05

Family

ID=17011922

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3237204A Pending JPH0553167A (en) 1991-08-23 1991-08-23 Diaphragm adjusting device for camera lens

Country Status (1)

Country Link
JP (1) JPH0553167A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011164614A (en) * 2010-02-09 2011-08-25 Axis Ab Calibration of lens device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011164614A (en) * 2010-02-09 2011-08-25 Axis Ab Calibration of lens device

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