JPS63120265U - - Google Patents
Info
- Publication number
- JPS63120265U JPS63120265U JP1117887U JP1117887U JPS63120265U JP S63120265 U JPS63120265 U JP S63120265U JP 1117887 U JP1117887 U JP 1117887U JP 1117887 U JP1117887 U JP 1117887U JP S63120265 U JPS63120265 U JP S63120265U
- Authority
- JP
- Japan
- Prior art keywords
- toner concentration
- light emitting
- emitting diode
- transistor
- detection 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Dry Development In Electrophotography (AREA)
Description
第１図は本考案に係るトナー濃度監視回路を備
えてトナー濃度検出装置の電気回路図、第２図は
本発明に係るトナー濃度監視回路を組込んだトナ
ー濃度検出装置の更に具体的な回路図、第３図は
従来のトナー濃度監視回路を備えたトナー濃度検
出装置の電気回路図、第４図はトナー濃度―出力
電圧特性図である。
１０……トナー濃度監視回路、１０１……トラ
ンジスタ、１０２……第１の発光ダイオード、１
０３……第２の発光ダイオード、１０４……ダイ
オード。
FIG. 1 is an electric circuit diagram of a toner concentration detection device equipped with a toner concentration monitoring circuit according to the present invention, and FIG. 2 is a more specific circuit diagram of a toner concentration detection device incorporating the toner concentration monitoring circuit according to the present invention. 3 is an electric circuit diagram of a toner concentration detection device equipped with a conventional toner concentration monitoring circuit, and FIG. 4 is a toner concentration-output voltage characteristic diagram. 10... Toner concentration monitoring circuit, 101... Transistor, 102... First light emitting diode, 1
03...Second light emitting diode, 104...Diode.
Claims (1)
値にあることを表示するトナー濃度監視回路にお
いて、ベースにトナー濃度検知信号が入力される
トランジスタと、このトランジスタに直列に接続
された第１の発光ダイオードと、前記第１の発光
ダイオード及び前記トランジスタの直列回路に対
して並列に接続される第２の発光ダイオード及び
ダイオードの直列回路とを備えることを特徴とす
るトナー濃度監視回路。 A toner concentration monitoring circuit that monitors a toner concentration detection signal and indicates that the toner concentration is at a predetermined value includes a transistor having a base to which the toner concentration detection signal is input, and a first light emitting diode connected in series to this transistor. and a second light emitting diode and a series circuit of diodes connected in parallel to the series circuit of the first light emitting diode and the transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1117887U JPH0631486Y2 (en) | 1987-01-28 | 1987-01-28 | Toner concentration monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1117887U JPH0631486Y2 (en) | 1987-01-28 | 1987-01-28 | Toner concentration monitoring circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63120265U true JPS63120265U (en) | 1988-08-03 |
| JPH0631486Y2 JPH0631486Y2 (en) | 1994-08-22 |
Family
ID=30798158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1117887U Expired - Lifetime JPH0631486Y2 (en) | 1987-01-28 | 1987-01-28 | Toner concentration monitoring circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0631486Y2 (en) |
-
1987
- 1987-01-28 JP JP1117887U patent/JPH0631486Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0631486Y2 (en) | 1994-08-22 |
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