JPS645558U - - Google Patents
Info
- Publication number
- JPS645558U JPS645558U JP9983087U JP9983087U JPS645558U JP S645558 U JPS645558 U JP S645558U JP 9983087 U JP9983087 U JP 9983087U JP 9983087 U JP9983087 U JP 9983087U JP S645558 U JPS645558 U JP S645558U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- lamp lighting
- opening
- current
- primary side
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 1
Description
第１図は本考案に係る画像読取り装置のランプ
点灯回路保護回路の回路ブロツク図、第２図はゲ
ート回路作動のタイムチヤート図である。
１…ランプ点灯回路、３…電流検出手段、３１
…電流モニタ用抵抗、３２…電流モニタアンプ、
４…電圧コンパレータ（検知手段）、５…制御手
段、５１…ＡＮＤゲート回路、６…開閉スイツチ
制御回路（回路開閉手段制御手段）、７…開閉ス
イツチ（回路開閉手段）、１０…制御回路（制御
手段）。
FIG. 1 is a circuit block diagram of a lamp lighting circuit protection circuit of an image reading apparatus according to the present invention, and FIG. 2 is a time chart of gate circuit operation. DESCRIPTION OF SYMBOLS 1... Lamp lighting circuit, 3... Current detection means, 31
...Current monitor resistor, 32...Current monitor amplifier,
4... Voltage comparator (detection means), 5... Control means, 51... AND gate circuit, 6... Open/close switch control circuit (circuit opening/closing means control means), 7... Open/close switch (circuit opening/closing means), 10... Control circuit (control means).
Claims (1)
流を検出する電流検出手段と、上記ランプ点灯回
路の一次側の電流が基準値を越えたか否かを検知
する検知手段と、上記ランプ点灯回路の一次側を
開閉する回路開閉手段と、上記ランプ点灯回路の
一次側の電流が基準値を越えたことにより上記検
知手段から出力される信号を受けた時上記回路開
閉手段を制御して上記ランプ点灯回路の一次側を
遮断する回路開閉手段制御手段とにより保護回路
を構成すると共に、該保護回路をランプ点灯時か
ら予め定めた時間経過後に有効とする制御手段を
備えて構成したこと、を特徴とする画像読取り装
置に於るランプ点灯回路の保護回路。 a current detection means for detecting a current on the primary side of the lamp lighting circuit of the image reading device; a detection means for detecting whether the current on the primary side of the lamp lighting circuit exceeds a reference value; a circuit opening/closing means for opening/closing the side; and a circuit opening/closing means for controlling the circuit opening/closing means to control the lamp lighting circuit when receiving a signal output from the detection means due to the current on the primary side of the lamp lighting circuit exceeding a reference value. A protection circuit is constituted by a circuit opening/closing means control means for cutting off the primary side, and a control means is provided for making the protection circuit effective after a predetermined time has elapsed from the time the lamp is turned on. Protection circuit for lamp lighting circuit in image reading device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9983087U JPS645558U (en) | 1987-06-29 | 1987-06-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9983087U JPS645558U (en) | 1987-06-29 | 1987-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS645558U true JPS645558U (en) | 1989-01-12 |
Family
ID=31327352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9983087U Pending JPS645558U (en) | 1987-06-29 | 1987-06-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS645558U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0444842U (en) * | 1990-08-09 | 1992-04-16 |
-
1987
- 1987-06-29 JP JP9983087U patent/JPS645558U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0444842U (en) * | 1990-08-09 | 1992-04-16 | ||
| JPH0543732Y2 (en) * | 1990-08-09 | 1993-11-04 |
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