JPH0662295A - Automatic focusing controller for zoom lens - Google Patents
Automatic focusing controller for zoom lensInfo
- Publication number
- JPH0662295A JPH0662295A JP4215852A JP21585292A JPH0662295A JP H0662295 A JPH0662295 A JP H0662295A JP 4215852 A JP4215852 A JP 4215852A JP 21585292 A JP21585292 A JP 21585292A JP H0662295 A JPH0662295 A JP H0662295A
- Authority
- JP
- Japan
- Prior art keywords
- zoom lens
- lens
- driving
- focus
- signal
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はズームレンズの自動焦点
制御装置に関し、特にＴＶカメラに適用するズームレン
ズの自動焦点制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens automatic focus control device, and more particularly to a zoom lens automatic focus control device applied to a TV camera.
【０００２】[0002]
【従来の技術】従来のズームレンズの自動焦点制御装置
では、ズームレンズ制御スイッチおよび焦点制御スイッ
チからの接点信号により、一定速度でズームレンズを駆
動している。2. Description of the Related Art In a conventional automatic focus control device for a zoom lens, a zoom lens is driven at a constant speed by a contact signal from a zoom lens control switch and a focus control switch.
【０００３】[0003]
【発明が解決しようとする課題】上述したように従来
は、一定速度でズームレンズを駆動している。しかし、
一般にズームレンズは、望遠側では焦点深度が小さくな
るのでピントが合わせにくくなり、逆に広角側では焦点
深度が大きくなるのでピントが合せ易くなる。このた
め、一定速度でズームレンズを駆動した場合、望遠側で
はレンズの動きが速すぎてピント合せに手間取って時間
がかかり、逆に、広角側ではレンズの動きが遅すぎてピ
ント合せに時間がかかるという問題点がある。As described above, conventionally, the zoom lens is driven at a constant speed. But,
Generally, a zoom lens has a small depth of focus on the telephoto side, which makes it difficult to focus. On the contrary, a zoom lens has a large depth of focus on the wide angle side, which facilitates focusing. For this reason, when the zoom lens is driven at a constant speed, the lens movement is too fast on the telephoto side and it takes time to focus, and conversely, on the wide-angle side, the lens movement is too slow and it takes time to focus. There is a problem of this.
【０００４】本発明の目的は、ズームレンズの焦点深度
に応じてレンズの焦点駆動速度を制御することにより、
確実かつ容易に最適時間でピントを合せることができる
ズームレンズの自動焦点制御装置を提供することにあ
る。An object of the present invention is to control the focus driving speed of a lens according to the depth of focus of the zoom lens.
An object of the present invention is to provide an automatic focus control device for a zoom lens, which can reliably and easily focus at an optimum time.
【０００５】[0005]
【課題を解決するための手段】本発明のズームレンズの
自動焦点制御装置は、ズームレンズを望遠側および広角
側に駆動するズームレンズ駆動機構と、前記ズームレン
ズの駆動位置を検出してレンズ位置信号を生成するレン
ズ位置検出手段と、焦点駆動信号に応じた速度でピント
が合うように前記ズームレンズを駆動する焦点駆動機構
と、前記レンズ位置信号に応じて前記焦点駆動信号を生
成する駆動速度制御手段とを備えて構成されている。ま
た、前記駆動速度制御手段は、前記ズームレンズが望遠
側に移動するにつれて速度が遅くなるように、また、広
角側に移動するにつれて速度が速くするように前記焦点
駆動信号を生成する構成である。SUMMARY OF THE INVENTION An automatic focus control device for a zoom lens according to the present invention comprises a zoom lens drive mechanism for driving the zoom lens to a telephoto side and a wide angle side, and a lens position by detecting a drive position of the zoom lens. A lens position detecting means for generating a signal, a focus driving mechanism for driving the zoom lens so as to focus at a speed according to the focus driving signal, and a driving speed for generating the focus driving signal according to the lens position signal. And a control means. Further, the drive speed control means is configured to generate the focus drive signal such that the speed becomes slower as the zoom lens moves toward the telephoto side, and the speed becomes faster as the zoom lens moves toward the wide angle side. .
【０００６】[0006]
【実施例】次に本発明について図面を参照して説明す
る。The present invention will be described below with reference to the drawings.
【０００７】図１は本発明の一実施例を示すブロック図
である。ここで、ズームレンズ駆動機構１は、駆動信号
Ｓｚに応じてズームレンズを望遠側および広角側に駆動
し、また、焦点駆動機構２は、駆動信号Ｓｆ２に応じて
ピントが合うようにレンズを駆動する。FIG. 1 is a block diagram showing an embodiment of the present invention. Here, the zoom lens drive mechanism 1 drives the zoom lens to the telephoto side and the wide-angle side according to the drive signal Sz, and the focus drive mechanism 2 drives the lens so as to be in focus according to the drive signal Sf2. To do.
【０００８】ズームレンズ駆動信号発生部３は、ズーム
レンズ制御スイッチ５からの接点信号に応じて、ズーム
レンズを望遠側および広角側に駆動する駆動信号Ｓｚを
発生する。The zoom lens drive signal generator 3 generates a drive signal Sz for driving the zoom lens to the telephoto side and the wide angle side in response to a contact signal from the zoom lens control switch 5.
【０００９】焦点駆動信号発生部４は、焦点制御スイッ
チ６からの接点信号に応じて、レンズを正方向および逆
方向に駆動する駆動信号Ｓｆ１を発生し、駆動速度制御
部８へ送出する。The focus drive signal generator 4 generates a drive signal Sf1 for driving the lens in the forward and reverse directions in response to a contact signal from the focus control switch 6 and sends it to the drive speed controller 8.
【００１０】レンズ位置検出部７は、ズームレンズの駆
動位置を検出し、ズームレンズの位置を示す信号Ｓｄを
生成して駆動速度制御部８へ送出する。The lens position detector 7 detects the drive position of the zoom lens, generates a signal Sd indicating the position of the zoom lens, and sends it to the drive speed controller 8.
【００１１】駆動速度制御部８は、ズームレンズの位置
を示す信号Ｓｄを受け、ズームレンズの位置、すなわ
ち、ズームレンズの焦点深度に応じて予め設定された駆
動速度となるように駆動信号Ｓｆ１を変換し、駆動信号
Ｓｆ２として焦点駆動機構２へ送出する。この場合、ズ
ームレンズが望遠側に移動するにつれてレンズの駆動速
度を遅くし、逆に、広角側に移動するにつれてレンズの
駆動速度を速くするように制御する。The drive speed control unit 8 receives the signal Sd indicating the position of the zoom lens, and sets the drive signal Sf1 so that the drive speed is preset according to the position of the zoom lens, that is, the focal depth of the zoom lens. It is converted and sent to the focus drive mechanism 2 as a drive signal Sf2. In this case, the drive speed of the lens is controlled to slow down as the zoom lens moves toward the telephoto side, and conversely, the drive speed of the lens increases toward the wide-angle side.
【００１２】[0012]
【発明の効果】以上説明したように本発明によれば、ズ
ームレンズの位置を検出し、ズームレンズが望遠側に移
動するにつれて焦点駆動速度を遅くし、逆に、広角側に
移動するにつれて焦点駆動速度を速くなるように制御す
ることにより、望遠側でのピント合せが容易となり、ま
た、広角側ではピント合せが速くなり、確実かつ容易に
最適時間でピントを合せることができる。As described above, according to the present invention, the position of the zoom lens is detected, the focus drive speed is slowed as the zoom lens moves toward the telephoto side, and conversely, the focus drive speed is moved toward the wide angle side. By controlling the driving speed to be high, focusing on the telephoto side becomes easy, and focusing on the wide angle side becomes fast, so that it is possible to focus reliably and easily in the optimum time.
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
１ ズームレンズ駆動機構 ２ 焦点駆動機構 ３ ズームレンズ駆動信号発生部 ４ 焦点駆動信号発生部 ７ レンズ位置検出部 ８ 駆動速度制御部 Ｓｚ，Ｓｆ１，Ｓｆ２ 駆動信号 Ｓｄ ズームレンズの位置を示す信号 1 zoom lens drive mechanism 2 focus drive mechanism 3 zoom lens drive signal generator 4 focus drive signal generator 7 lens position detector 8 drive speed controller Sz, Sf1, Sf2 drive signal Sd signal indicating zoom lens position
Claims (2)
動するズームレンズ駆動機構と、前記ズームレンズの駆
動位置を検出してレンズ位置信号を生成するレンズ位置
検出手段と、焦点駆動信号に応じた速度でピントが合う
ように前記ズームレンズを駆動する焦点駆動機構と、前
記レンズ位置信号に応じて前記焦点駆動信号を生成する
駆動速度制御手段とを備えることを特徴とするズームレ
ンズの自動焦点制御装置。1. A zoom lens drive mechanism for driving a zoom lens to a telephoto side and a wide angle side, a lens position detection means for detecting a drive position of the zoom lens and generating a lens position signal, and a focus drive signal according to the focus drive signal. Automatic focus control of a zoom lens, comprising: a focus drive mechanism for driving the zoom lens so as to focus at a speed; and drive speed control means for generating the focus drive signal according to the lens position signal. apparatus.
ンズが望遠側に移動するにつれて速度が遅くなるよう
に、また、広角側に移動するにつれて速度が速くするよ
うに前記焦点駆動信号を生成することを特徴とする請求
項１記載のズームレンズの自動焦点制御装置。2. The drive speed control means generates the focus drive signal so that the speed becomes slower as the zoom lens moves toward the telephoto side, and the speed becomes faster as the zoom lens moves toward the wide angle side. The automatic focus control device for a zoom lens according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4215852A JPH0662295A (en) | 1992-08-13 | 1992-08-13 | Automatic focusing controller for zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4215852A JPH0662295A (en) | 1992-08-13 | 1992-08-13 | Automatic focusing controller for zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0662295A true JPH0662295A (en) | 1994-03-04 |
Family
ID=16679346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4215852A Pending JPH0662295A (en) | 1992-08-13 | 1992-08-13 | Automatic focusing controller for zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0662295A (en) |
-
1992
- 1992-08-13 JP JP4215852A patent/JPH0662295A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19990330 |