JPH03101193U - - Google Patents
Info
- Publication number
- JPH03101193U JPH03101193U JP876090U JP876090U JPH03101193U JP H03101193 U JPH03101193 U JP H03101193U JP 876090 U JP876090 U JP 876090U JP 876090 U JP876090 U JP 876090U JP H03101193 U JPH03101193 U JP H03101193U
- Authority
- JP
- Japan
- Prior art keywords
- zoom lens
- motor
- electric zoom
- instantaneously
- voltage
- 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
- Lens Barrels (AREA)
- Stopping Of Electric Motors (AREA)
Description
第１図は本考案の電動ズームレンズ駆動回路の
一実施例のブロツク図、第２図ａ乃至ｃは第１図
の各部の信号波形を示すタイムチヤートである。
１……ＤＣモータ、２……ＤＣ電源、３……ス
イツチ、４……コンパレータ、５……単安定マル
チバイブレータ、６……出力ドライバ、７ａ……
リレーコイル、７ｂ……メーク接点。
FIG. 1 is a block diagram of one embodiment of the electric zoom lens driving circuit of the present invention, and FIGS. 2a to 2c are time charts showing signal waveforms at various parts in FIG. 1. 1... DC motor, 2... DC power supply, 3... Switch, 4... Comparator, 5... Monostable multivibrator, 6... Output driver, 7a...
Relay coil, 7b...Make contact.
Claims (1)
動されるＤＣモータによつてフオーカシングやズ
ーミングを行うようにした電動ズームレンズにお
いて、前記ＤＣモータへ供給されるＤＣ電圧の断
状態を検出する手段と、この検出出力により瞬時
的に信号を出力する手段と、この信号により前記
ＤＣモータにそれまでとは逆の極性のＤＣ電圧を
瞬時的に印加させる手段とを備えることを特徴と
する電動ズームレンズ駆動回路。 In an electric zoom lens used in a television camera or the like, in which focusing and zooming are performed by a DC motor driven by a DC power source, means for detecting a disconnection state of a DC voltage supplied to the DC motor; An electric zoom lens drive circuit comprising: means for instantaneously outputting a signal based on a detection output; and means for instantaneously applying a DC voltage of opposite polarity to the DC motor according to the signal. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP876090U JPH03101193U (en) | 1990-01-31 | 1990-01-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP876090U JPH03101193U (en) | 1990-01-31 | 1990-01-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03101193U true JPH03101193U (en) | 1991-10-22 |
Family
ID=31512380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP876090U Pending JPH03101193U (en) | 1990-01-31 | 1990-01-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03101193U (en) |
-
1990
- 1990-01-31 JP JP876090U patent/JPH03101193U/ja active Pending
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