JPH0125005Y2 - - Google Patents
Info
- Publication number
- JPH0125005Y2 JPH0125005Y2 JP1979173648U JP17364879U JPH0125005Y2 JP H0125005 Y2 JPH0125005 Y2 JP H0125005Y2 JP 1979173648 U JP1979173648 U JP 1979173648U JP 17364879 U JP17364879 U JP 17364879U JP H0125005 Y2 JPH0125005 Y2 JP H0125005Y2
- Authority
- JP
- Japan
- Prior art keywords
- output
- hall element
- amplifier
- magnet
- input
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Exposure Control For Cameras (AREA)
- Diaphragms For Cameras (AREA)
Description
【考案の詳細な説明】
本考案はビデオカメラにおける自動露出調整装
置等において、その光学絞りを手動操作によつて
所望の口径に設定Ｌ、あるいはビデオ出力の平均
レベルを所望の値に保持するための装置に関す
る。[Detailed description of the invention] The present invention is used to manually set the optical aperture to a desired aperture, or to maintain the average level of video output at a desired value, in an automatic exposure adjustment device for a video camera, etc. Regarding the device.
一般用のビデオカメラにおいては通常、被写体
の明るさに関係なくビデオ出力の平均レベルをほ
ぼ一定に保持するために、撮像管の前面における
虹彩絞りその他適宜の光学絞りをサーボ機構によ
つて自動調整する装置が設けられる。しかし手動
調整を必要とする場合に、従来は機械的な調整機
構を設けるか、あるいは特開昭52−100231号公報
に示されているように絞りに摺動抵抗またはフオ
トカプラ等を連動させて位置を検出することによ
り電気的に調整する装置を設けていたが、機構が
複雑で故障を生じ易いと共に摺動抵抗の駆動には
極めて大きい電力を必要とするから装置が大型に
なる等の欠点がある。従つて本考案は前述のよう
なビデオ出力の自動調整と絞りの手動調整とを任
意に行い得る極めて小型で簡単な制御装置を提供
するものである。 In general-use video cameras, the iris diaphragm and other appropriate optical diaphragms on the front of the image pickup tube are usually automatically adjusted by a servo mechanism in order to maintain a nearly constant average level of video output regardless of the brightness of the subject. A device is provided to do so. However, when manual adjustment is required, conventional methods have been to provide a mechanical adjustment mechanism, or, as shown in Japanese Patent Application Laid-open No. 52-100231, to adjust the position by interlocking a sliding resistor or a photo coupler with the diaphragm. A device was installed to electrically adjust the resistance by detecting the resistance, but the mechanism was complex and prone to failure, and it required an extremely large amount of electric power to drive the sliding resistance, making the device large. be. Therefore, the present invention provides an extremely compact and simple control device that can arbitrarily perform the automatic adjustment of the video output and the manual adjustment of the aperture as described above.
第１図乃至第５図は本考案の一実施例で、第１
図に正面図、第２図に側面図を示したように、サ
ーボモータ１の軸に取付けた腕２をピン３で虹彩
絞り４の操作レバー５に連結してある。絞り４は
レンズ６，６と一体に構成されたもので、該レン
ズの背後に撮像管７が配設される。また第３図は
サーボモータ１の縦断面図、第４図は第３図のＡ
−Ａ断面図で、円筒状のヨーク８の中に円板状の
可動磁石９を回転自在に軸支し、この磁石を囲繞
するコイル１０，１１を設けてある。磁石９は第
４図にＮ，Ｓで示したように径方向に磁化された
もので、上記コイルに例えば正の電流を加えると
右回転し、負の電流を加えると左回転するが、そ
の回転角範囲は180度以内である。かつヨーク８
の蓋板１２を非磁性体で形成して、その外側に更
に同様の蓋体１３を嵌装し、この蓋体の内面にホ
ール素子１４を取付けて前記磁石９の周縁部に対
向させてある。第５図は電気回路の構成を示した
図で、ホール素子１４の出力を増幅器１５および
調整回路１６に順次加え、切換スイツチ１７を介
してその出力を差動増幅器１８の一方の入力とし
てある。この増幅器１８は他方の入力として基準
電圧源１９の出力を加えられるもので、その出力
をサーボモータ１の駆動コイルに加えてある。ま
た前記撮像管７の出力をビデオ増幅器２０に加
え、スイツチ１７を介してその出力を前記差動増
幅器１８に加えるようにしてある。なお調整回路
１６は例えば演算増幅器であつて、入力と出力と
の割合、すなわち利得を任意に設定することがで
きる。かつ増幅器１５にはホール素子１４の温度
特性補償回路および個々のホール素子の感度差補
正回路等を設けてある。また図示してないが、第
４図のコイル１０を駆動コイルとして用いてこれ
に差動増幅器１８の出力を加え、コイル１１を制
動コイルとして用いるもので、磁石９の回転によ
つて該コイルに生ずる起電力を増幅器１８の入力
端に帰還することにより、モータの回転に制動を
加えるようにしてある。 Figures 1 to 5 show an embodiment of the present invention;
As shown in the front view and in the side view in FIG. 2, an arm 2 attached to the shaft of a servo motor 1 is connected to an operating lever 5 of an iris diaphragm 4 with a pin 3. The aperture 4 is constructed integrally with lenses 6, 6, and an imaging tube 7 is disposed behind the lenses. Also, Fig. 3 is a longitudinal cross-sectional view of the servo motor 1, and Fig. 4 is A of Fig. 3.
In the -A sectional view, a disc-shaped movable magnet 9 is rotatably supported in a cylindrical yoke 8, and coils 10 and 11 are provided to surround this magnet. The magnet 9 is magnetized in the radial direction as shown by N and S in FIG. The rotation angle range is within 180 degrees. Katsu yoke 8
The lid plate 12 is made of a non-magnetic material, and a similar lid 13 is further fitted on the outside thereof, and a Hall element 14 is attached to the inner surface of this lid so as to face the peripheral edge of the magnet 9. . FIG. 5 is a diagram showing the configuration of an electric circuit, in which the output of the Hall element 14 is sequentially applied to an amplifier 15 and an adjustment circuit 16, and the output is used as one input of a differential amplifier 18 via a changeover switch 17. This amplifier 18 has the output of a reference voltage source 19 added to it as the other input, and the output is applied to the drive coil of the servo motor 1. Further, the output of the image pickup tube 7 is applied to a video amplifier 20, and the output thereof is applied to the differential amplifier 18 via a switch 17. Note that the adjustment circuit 16 is, for example, an operational amplifier, and the ratio between input and output, that is, the gain can be set arbitrarily. The amplifier 15 is also provided with a temperature characteristic compensation circuit for the Hall element 14, a sensitivity difference compensation circuit for each Hall element, and the like. Although not shown, the coil 10 shown in FIG. 4 is used as a drive coil, the output of the differential amplifier 18 is added thereto, and the coil 11 is used as a braking coil. By feeding back the generated electromotive force to the input terminal of the amplifier 18, the rotation of the motor is braked.
上述の装置において、スイツチ１７を図の状態
に設定すると、増幅器１８はビデオ増幅器２０と
基準電圧との差を増幅してモータ１に加える。従
つてもしビデオ増幅器２０の出力が基準電圧より
大きいときはモータ１が例えば右回転して絞り４
の口径が縮少し、小さいときは左回転して口径が
拡大する。この動作によつて撮像管７のビデオ出
力が常に一定のレベルを保持するように、絞り４
の自動調整が行われる。また上記絞り４の手動調
整を行う場合は、スイツチ１７を切換えて、調整
回路１６を所望の口径の位置に設定する。この状
態では調整回路１６の出力と基準電圧との差が増
幅器１８で増幅されてサーボモータ１に加わる。
ホール素子１４は前述のように径方向に磁化され
た円板状磁石９の周縁部と対向するように配置さ
れているから、該磁石の回転に伴つて上記ホール
素子の部分の磁界強度が変化し、このため磁石の
回転角位置に対応した出力が該素子から送出され
る。かつ増幅器１５は上記出力を一定の割合で増
幅するが、その出力をＩ、調整回路１６の利得を
Ｐ、基準電圧源１９の出力をＫとすると、モータ
１が適宜の方向へ回転してPIがＫと等しくなつ
たときサーボ増幅器１８の出力が消滅して、該モ
ータが停止する。すなわち上記出力ＩがＫ／Ｐと
なる位置で磁石９が停止する。この磁石９に絞り
４が直結されているから、調整回路１６の設定値
Ｐによつて上記絞りの口径が定まる。従つて上記
回路１６の調整摘み等に絞りの値Ｆの目盛を施し
ておくことにより、絞り４の口径を手動操作によ
つて簡易に設定することができる。 In the device described above, when the switch 17 is set to the state shown, the amplifier 18 amplifies the difference between the video amplifier 20 and the reference voltage and applies it to the motor 1. Therefore, if the output of the video amplifier 20 is higher than the reference voltage, the motor 1 will rotate clockwise, for example, and the aperture 4 will be rotated clockwise.
When the aperture is small, it rotates counterclockwise and the aperture increases. Through this operation, the aperture 4 is
automatic adjustment is performed. When manually adjusting the diaphragm 4, the switch 17 is switched to set the adjustment circuit 16 to the desired aperture position. In this state, the difference between the output of the adjustment circuit 16 and the reference voltage is amplified by the amplifier 18 and applied to the servo motor 1.
Since the Hall element 14 is arranged to face the peripheral edge of the disc-shaped magnet 9 magnetized in the radial direction as described above, the magnetic field strength at the Hall element portion changes as the magnet rotates. Therefore, an output corresponding to the rotational angular position of the magnet is sent out from the element. The amplifier 15 amplifies the above output at a constant rate, and if the output is I, the gain of the adjustment circuit 16 is P, and the output of the reference voltage source 19 is K, the motor 1 rotates in an appropriate direction and PI When becomes equal to K, the output of the servo amplifier 18 disappears and the motor stops. That is, the magnet 9 stops at the position where the output I becomes K/P. Since the aperture 4 is directly connected to the magnet 9, the aperture diameter of the aperture is determined by the set value P of the adjustment circuit 16. Therefore, by providing a scale of the aperture value F on the adjustment knob or the like of the circuit 16, the aperture of the aperture 4 can be easily set by manual operation.
また第６図、第７図は本考案の他の実施例にお
ける第２図並びに第１図の一部に相当する部分を
示したもので、虹彩絞り４の基台部分にホール素
子１４を取付けると共にその操作レバー５に小型
の磁石２１を取付けてそれらを対向させてある。
従つてサーボモータ１の回転によりレバー５が駆
動されると、素子１４の出力が変化するもので、
前述の実施例と全く同様の動作が行われる。かつ
このような装置においてはサーボモータ１として
可動線輪型その他任意の形式のものを用い得ると
共にレバー５と上記モータとの間の連動機構によ
る誤差を生じないから精密な設定を行うことがで
きる。なおこの場合は、操作レバー５にホール素
子を取付けて、基台に磁石を固定することも可能
である。以上実施例について説明したように、本
考案は回転角が180度以内の可動磁石型サーボモ
ータとホール素子とを用いると共にこのホール素
子の出力またはビデオ出力を一方の入力とし、他
方の入力として基準入力を加えられる差動増幅器
並びに上記ホール素子の出力の調整回路等を登録
請求の範囲記載のように結合した構成を要旨とす
るものである。このように本考案の装置は回転角
が180度以内のサーボモータとホール素子とを用
いるから、光学絞りに対する連動機構だけでなく
ホール素子との間の連動機構をも極めて簡単に構
成することが出来る。また上記ホール素子の出力
に対する調整回路を設けることにより、複雑な連
動切換スイツチ等を必要とすることなく、簡単な
単一の切換スイツチをもつて光学絞りの手動調整
とビデオ出力の自動調整との切換を行うことがで
きる。かつ大電力を必要とする摺動抵抗の自動調
整機構等をも必要としないから、特に可動部の構
成が簡単で、装置を極めて軽量小形に形成して、
しかも連動機構の遊び等も無いから高精度の動作
が行われる等の作用効果がある。 Further, FIGS. 6 and 7 show parts corresponding to parts of FIGS. 2 and 1 in other embodiments of the present invention, in which a Hall element 14 is attached to the base of the iris diaphragm 4. At the same time, a small magnet 21 is attached to the operating lever 5 so that they face each other.
Therefore, when the lever 5 is driven by the rotation of the servo motor 1, the output of the element 14 changes.
The operation is exactly the same as in the previous embodiment. In addition, in such a device, a movable ring type or any other type of servomotor can be used as the servomotor 1, and precise settings can be made since no errors occur due to the interlocking mechanism between the lever 5 and the motor. . In this case, it is also possible to attach a Hall element to the operating lever 5 and fix the magnet to the base. As described above, the present invention uses a movable magnet type servo motor with a rotation angle of 180 degrees or less and a Hall element, and uses the output of the Hall element or video output as one input, and the other input as a reference. The gist of the present invention is a configuration in which a differential amplifier to which an input is applied, a circuit for adjusting the output of the Hall element, etc. are combined as described in the claims. As described above, since the device of the present invention uses a servo motor with a rotation angle of 180 degrees or less and a Hall element, it is possible to extremely easily configure not only the interlocking mechanism for the optical diaphragm but also the interlocking mechanism for the Hall element. I can do it. In addition, by providing an adjustment circuit for the output of the Hall element, a simple single switch can be used to manually adjust the optical diaphragm and automatically adjust the video output, without requiring a complex interlocking switch. Switching can be performed. Moreover, since there is no need for an automatic adjustment mechanism for sliding resistance that requires a large amount of electric power, the structure of the movable parts is particularly simple, and the device can be made extremely light and small.
Furthermore, since there is no play in the interlocking mechanism, there are effects such as highly accurate operation.
第１図乃至第５図は本考案の一実施例で、第１
図は正面図、第２図は側面図、第３図は第２図に
おけるサーボモータの縦断面図、第４図は第３図
のＡ−Ａ断面図、第５図は電気回路の構成を示し
た図である。また第６図、第７図は本考案の他の
実施例におけるそれぞれ第２図の１部並びに第１
図の１部に相当する図である。なお図において、
１はサーボモータ、２は腕、３はピン、４は虹彩
絞り、５は操作レバー、６はレンズ、７は撮像
管、８はヨーク、９は可動磁石、１０，１１はコ
イル、１２は蓋板、１３は蓋体、１４はホール素
子、１５は増幅器、１６は調整回路、１７は切換
スイツチ、１８は差動増幅器、１９は基準電圧
源、２０はビデオ増幅器、２１は磁石である。
Figures 1 to 5 show one embodiment of the present invention;
The figure is a front view, Figure 2 is a side view, Figure 3 is a longitudinal sectional view of the servo motor in Figure 2, Figure 4 is a sectional view taken along line AA in Figure 3, and Figure 5 shows the configuration of the electric circuit. FIG. Further, FIGS. 6 and 7 are a part of FIG. 2 and a first part of other embodiments of the present invention, respectively.
It is a figure corresponding to a part of a figure. In the figure,
1 is a servo motor, 2 is an arm, 3 is a pin, 4 is an iris diaphragm, 5 is an operating lever, 6 is a lens, 7 is an image pickup tube, 8 is a yoke, 9 is a movable magnet, 10 and 11 are coils, and 12 is a lid 13 is a lid, 14 is a Hall element, 15 is an amplifier, 16 is an adjustment circuit, 17 is a changeover switch, 18 is a differential amplifier, 19 is a reference voltage source, 20 is a video amplifier, and 21 is a magnet.
Claims (1)
にビデオカメラの光学絞りを連動させて、その可
動部と静止部との一方に取付けたホール素子を他
方の磁石に対向させると共に上記ホール素子の出
力を加えられる増幅器およびビデオカメラの撮像
管出力を加えられるビデオ増幅器を設け、かつ基
準入力を一方の入力とする差動増幅器の出力端に
前記サーボモータを接続して、上記差動増幅器の
他方の入力として前記２つの増幅器の何れかの出
力を任意に選択して加える切換スイツチ並びに前
記ホール素子に接続された増幅器の出力を所望の
割合で増減する調整回路を設けたビデオカメラの
光学絞制御装置。 The optical diaphragm of the video camera is linked to a movable magnet type servo motor with a rotation angle of 180 degrees or less, and the Hall element attached to one of the movable part and the stationary part is made to face the other magnet, and the output of the Hall element is and a video amplifier to which the image pickup tube output of the video camera is applied, and the servo motor is connected to the output terminal of a differential amplifier whose one input is the reference input, and the other of the differential amplifiers is connected to the output terminal of the differential amplifier. An optical aperture control device for a video camera, comprising a changeover switch that arbitrarily selects and applies the output of either of the two amplifiers as an input, and an adjustment circuit that increases or decreases the output of the amplifier connected to the Hall element at a desired rate. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979173648U JPH0125005Y2 (en) | 1979-12-17 | 1979-12-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979173648U JPH0125005Y2 (en) | 1979-12-17 | 1979-12-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5692121U JPS5692121U (en) | 1981-07-22 |
| JPH0125005Y2 true JPH0125005Y2 (en) | 1989-07-27 |
Family
ID=29684425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979173648U Expired JPH0125005Y2 (en) | 1979-12-17 | 1979-12-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0125005Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2712167B2 (en) * | 1987-02-19 | 1998-02-10 | ソニー株式会社 | Auto iris circuit of imaging device |
-
1979
- 1979-12-17 JP JP1979173648U patent/JPH0125005Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5692121U (en) | 1981-07-22 |
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