JPS5838938A - Lens device having electromagnetically driven diaphragm - Google Patents

Lens device having electromagnetically driven diaphragm

Info

Publication number
JPS5838938A
JPS5838938A JP13814781A JP13814781A JPS5838938A JP S5838938 A JPS5838938 A JP S5838938A JP 13814781 A JP13814781 A JP 13814781A JP 13814781 A JP13814781 A JP 13814781A JP S5838938 A JPS5838938 A JP S5838938A
Authority
JP
Japan
Prior art keywords
stopper
aperture
diaphragm
lens device
meter
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
JP13814781A
Other languages
Japanese (ja)
Inventor
Toshiichi Ichiyanagi
一柳 外史一
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 JP13814781A priority Critical patent/JPS5838938A/en
Publication of JPS5838938A publication Critical patent/JPS5838938A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00Exposure-making shutters; Diaphragms
    • G03B9/02Diaphragms
    • G03B9/06Two or more co-operating pivoted blades, e.g. iris type

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Diaphragms For Cameras (AREA)
  • Shutters For Cameras (AREA)

Abstract

PURPOSE:To eliminate the clatters between a stopper and a gear and to decrease the errors in an aperture value by passing electric current in an opposite direction to a diaphragm meter while the diaphragm is held stopper by electromagnetic driving. CONSTITUTION:When a photometric switch of a camera is turned on and a shutter switch is turned on, a stopper pawl 13 is attracted by a magnet 14 and is released from the tooth parts of saw teeth 12 by overcoming the force of a spring 13'. When a meter 11 is driven and a set aperture value is attained, a stopper is engaged; at the same time, electric current flows in an opposite direction in a circuit L 1, by which the mechanical clatters of the diaphragm mechanism are eliminated.

Description

【発明の詳細な説明】 本発明はカメラに装着される撮影レンズ装置で絞り装置
を駆動するためのパルスモーターヲ内蔵するレンズ装置
に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens device equipped with a pulse motor for driving an aperture device in a photographic lens device mounted on a camera.

−眼しフレックスカメラ眸に装着される撮影レンズの絞
り機構をパルス信号により駆動されるステッピングモー
ターで駆動するために、レンズ装置にパルスモータ−を
組込む方法が従来から提示されている。このようにパル
スモータ−で絞9をれによって露光量VCvA差を生じ
ることがあった。
- Conventionally, a method has been proposed in which a pulse motor is incorporated into a lens device in order to drive the diaphragm mechanism of a photographic lens attached to a flex camera using a stepping motor driven by a pulse signal. As described above, a difference in exposure amount VCvA may occur due to the aperture 9 being moved by the pulse motor.

本発明は上記の如き従来装置の欠点である絞りの停止状
態における機械的なガタをなくすると共に、軽量でコン
パクトな絞り駆動用電磁装置を備えた撮影レンズ装置を
提供することを目的とするものである。
SUMMARY OF THE INVENTION An object of the present invention is to eliminate the mechanical play when the aperture is stopped, which is a disadvantage of conventional devices as described above, and to provide a photographic lens device equipped with a lightweight and compact electromagnetic device for driving an aperture. It is.

以下図面によって本発明の詳細な説明する。The present invention will be explained in detail below with reference to the drawings.

第1図は本発明忙よるレンズ装置を装着した一眼レフレ
ックスカメラの一例を示す正面図である。
FIG. 1 is a front view showing an example of a single-lens reflex camera equipped with a lens device according to the present invention.

図において、1はカメラ本体、2はレンズ、6および4
はレンズの駆動用モーターであり、3はズーム調整用、
4は距離調整用のもの、5はレンズの絞り機構である。
In the figure, 1 is the camera body, 2 is the lens, 6 and 4
is the lens drive motor, 3 is for zoom adjustment,
4 is a distance adjustment device, and 5 is a lens aperture mechanism.

カメラ本体1@の6はレリーズボタン、7はファインダ
ー、8はアクセサリ−シューである。撮影レンズ装置は
レンズ鏡筒から一方向に突出部を設けて、ここに駆動用
モーター等を内蔵させ、この突部がカメラ本体のアクセ
サリ−シュー8に装着されるストロボ装置の照射の光の
じゃまにならないように図示のように側方向又は下方向
になるように配置される。
On the camera body 1@, 6 is a release button, 7 is a viewfinder, and 8 is an accessory shoe. The photographic lens device has a protruding part in one direction from the lens barrel, and a drive motor etc. is built into the protruding part. It is arranged so that it faces sideways or downwards as shown in the figure.

第2図は本発明によるレンズの絞り駆動部の一実施例を
示す路線図で、9は絞り羽根に連動する可変抵抗、10
は絞り羽根、11は絞り羽根を駆動する電磁機構(メー
ター)、12は絞り羽根に連動するノコ歯を有する部材
、13は12のノコ歯に係合するストッパー、161は
ストッパー16をノコ歯の方向に付勢するバネ1,14
はストッパー16の解除を行う電磁マグネットである。
FIG. 2 is a route diagram showing an embodiment of the aperture drive section of the lens according to the present invention, in which numeral 9 indicates a variable resistor linked to the aperture blades, and 10
11 is an aperture blade, 11 is an electromagnetic mechanism (meter) that drives the aperture blade, 12 is a member having saw teeth that interlocks with the aperture blade, 13 is a stopper that engages with the saw teeth of 12, and 161 is a part of the stopper 16 that is connected to the saw tooth. Spring 1, 14 that biases in the direction
is an electromagnetic magnet that releases the stopper 16.

第3図は本発明によるレンズ装置の回路構成の一実施例
を示す回路接続図で、図の23.24および25がカメ
ラ本体とレンズ装置とを接続するコネクターであり、カ
メラ本体にレンズを装着するととによりカメラ本体内の
電源の(1)および←)極と制御信号端子へ接続される
。レンズ装置における15は絞り制御回路で端子24か
らの制御信号を入力して出力に絞り設定値■^を出力す
る。16はコンパレーターで前記絞り制御回路の出力V
^と基準電圧VKの分圧点の電圧とを比較し、その出方
でメーターL1およびマグネットL2を作動させる。
FIG. 3 is a circuit connection diagram showing an example of the circuit configuration of the lens device according to the present invention. Reference numerals 23, 24, and 25 in the figure are connectors that connect the camera body and the lens device, and the lens is attached to the camera body. Then, it is connected to the (1) and ←) poles of the power supply inside the camera body and the control signal terminal. Reference numeral 15 in the lens device is an aperture control circuit which inputs a control signal from a terminal 24 and outputs an aperture setting value ■^. 16 is a comparator that outputs the output V of the aperture control circuit.
^ and the voltage at the dividing point of the reference voltage VK are compared, and the meter L1 and magnet L2 are activated depending on the output.

17.18,20.21はダイオード、19.22は抵
抗であり、抵抗22は絞り羽根に連動する可変抵抗9と
共に基準電圧vKの分圧回路を構成する。
17.18, 20.21 are diodes, 19.22 are resistors, and the resistor 22 constitutes a voltage dividing circuit for the reference voltage vK together with the variable resistor 9 linked to the aperture blades.

!jg4図は!2図および第3図示の装置の動作を示す
タイミングチャートである。
! jg4 diagram! 3 is a timing chart showing the operation of the apparatus shown in FIGS. 2 and 3; FIG.

図において、カメラの測光スイッチsw1がオンし、つ
いでシャッタースイッチ8W2がオンすると、ストッパ
ー爪13はマグネット14により吸引されてバネ13’
の力に抗してノコ歯12の歯部から解除される。つぎに
メーター11が駆動され設定絞り値になるとストッパー
が入り、同時KL1には第4図示の如く逆方向に電流が
流れ、これKより絞り機構の機械的ガタがなくなるもの
である。第3図の回路において、前記カメラ側のスイッ
チsw1゜SW2がオンすると、端子24へ信号が入り
、これが絞り制御回路15へ印加される。15から出力
V^ が出ると絞りメ・°−ター11へは左から右方向
へ第4図のLlの電流が流れ絞りメーター11が駆動さ
れる。この絞り機構に連動する抵抗9と抵抗22で分圧
された■にの分圧がコンパレーター16の反転入力であ
り、前記15の出力■^がコンパレーター16の非反転
入力である。抵抗9の連動により反転入力の電圧がV^
より高くなると、コンパレーター16の出力が反転し、
第4図のLlに示すように、絞りメーター11には右か
ら左方向に小電流が流れる。この電流により第2図の爪
16とノコ歯12とが噛合して絞り羽根のガタがなくな
るように作動するものである。
In the figure, when the camera's photometry switch sw1 is turned on and then the shutter switch 8W2 is turned on, the stopper claw 13 is attracted by the magnet 14 and spring 13'
It is released from the tooth portion of the sawtooth 12 against the force of . Next, the meter 11 is driven and when the set aperture value is reached, the stopper is engaged, and at the same time, current flows through KL1 in the opposite direction as shown in Figure 4, thereby eliminating mechanical play in the aperture mechanism. In the circuit shown in FIG. 3, when the camera-side switches sw1 and SW2 are turned on, a signal is input to the terminal 24, and this signal is applied to the aperture control circuit 15. When the output V^ is output from the aperture meter 15, a current Ll in FIG. 4 flows from left to right to the aperture meter 11, and the aperture meter 11 is driven. The voltage divided by the resistor 9 and the resistor 22, which are connected to the aperture mechanism, is the inverting input of the comparator 16, and the output 15 is the non-inverting input of the comparator 16. Due to the interlocking of resistor 9, the voltage of the inverting input becomes V^
When it becomes higher, the output of comparator 16 is inverted,
As shown by Ll in FIG. 4, a small current flows through the aperture meter 11 from right to left. This current causes the claws 16 and saw teeth 12 shown in FIG. 2 to engage with each other, thereby eliminating play in the aperture blades.

以上のように本発明のレンズ装置においては、電磁駆動
忙より絞りが停止しているとき、絞りメーターに逆方向
の電流を流すととKよりストッパーと歯車の歯との間の
ガタをなくすことKより絞り値の誤差を少なくなし得る
ものであり、電磁駆動絞り機構を備えたレンズ装置の自
動絞り動作を極めて安定確実なものとなし得る効果は大
なるものがある。
As described above, in the lens device of the present invention, when the aperture is stopped due to the electromagnetic drive, by flowing a current in the opposite direction to the aperture meter, the looseness between the stopper and the teeth of the gear can be eliminated. It is possible to reduce errors in the aperture value than K, and has a great effect in making the automatic aperture operation of a lens device equipped with an electromagnetically driven aperture mechanism extremely stable and reliable.

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

第1図は本発明によるレンズ装置を装着した一眼レフレ
ックスカメラの一例を示す正面図、第2図は本発明によ
るレンズ装置の絞り駆動部の一実施例を示す路線図、第
6図は本発明によるレンズ装置の回路構成の一実施例を
示す回路接続図、第4図は第2図、第6図示のレンズ装
置の動作を示すタイミングチャートである。 9・・・絞り羽根に連動する可変抵抗、10・・・絞り
羽根、111」絞り羽根駆動用メーター、12・−・絞
り羽根に連動するノコ歯部材、13・・・ストッパー、
14・・・電磁マグネット、15・・・絞り制御回路、
16・・・コンパレータO
FIG. 1 is a front view showing an example of a single-lens reflex camera equipped with a lens device according to the present invention, FIG. 2 is a route diagram showing an example of an aperture drive section of the lens device according to the present invention, and FIG. FIG. 4 is a circuit connection diagram showing one embodiment of the circuit configuration of the lens device according to the invention, and FIG. 4 is a timing chart showing the operation of the lens device shown in FIGS. 2 and 6. 9... Variable resistor linked to the aperture blade, 10... Aperture blade, 111'' meter for driving the aperture blade, 12... Sawtooth member linked to the aperture blade, 13... Stopper,
14... Electromagnetic magnet, 15... Aperture control circuit,
16... Comparator O

Claims (1)

【特許請求の範囲】 駆動絞りを備えるレンズ装置において、前記電磁駆動絞
りに連動するノコ歯回転部材と該ノコ歯と噛合するスト
ッパ一部材とを備え、前記電磁駆動による絞り羽根の回
動をノコ歯とストッパーとの噛合で停止せしめる時、前
記電磁駆動絞り部材に数回 り回動時とは反対方向の電流を流して絞り層板を安定に
停止せしめることを特徴とする電磁駆動絞りを有するレ
ンズ装置。
[Scope of Claims] A lens device equipped with a driving diaphragm, comprising a sawtooth rotating member that interlocks with the electromagnetically driven diaphragm and a stopper member that meshes with the sawtooth, and that rotates the aperture blades by the electromagnetic drive. A lens having an electromagnetically driven diaphragm, characterized in that when stopping due to engagement between teeth and a stopper, a current is passed through the electromagnetically driven diaphragm member in the opposite direction to that when the diaphragm laminate is rotated several times to stably stop the diaphragm plate. Device.
JP13814781A 1981-09-02 1981-09-02 Lens device having electromagnetically driven diaphragm Pending JPS5838938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13814781A JPS5838938A (en) 1981-09-02 1981-09-02 Lens device having electromagnetically driven diaphragm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13814781A JPS5838938A (en) 1981-09-02 1981-09-02 Lens device having electromagnetically driven diaphragm

Publications (1)

Publication Number Publication Date
JPS5838938A true JPS5838938A (en) 1983-03-07

Family

ID=15215100

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13814781A Pending JPS5838938A (en) 1981-09-02 1981-09-02 Lens device having electromagnetically driven diaphragm

Country Status (1)

Country Link
JP (1) JPS5838938A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61251828A (en) * 1985-04-30 1986-11-08 Konishiroku Photo Ind Co Ltd Shutter device
JPS62223736A (en) * 1986-03-26 1987-10-01 Copal Co Ltd Electromagnetic driving shutter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61251828A (en) * 1985-04-30 1986-11-08 Konishiroku Photo Ind Co Ltd Shutter device
JPH0533771B2 (en) * 1985-04-30 1993-05-20 Konishiroku Photo Ind
JPS62223736A (en) * 1986-03-26 1987-10-01 Copal Co Ltd Electromagnetic driving shutter
JPH0579969B2 (en) * 1986-03-26 1993-11-05 Copal Co Ltd

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