JPS5511225A - Printing density detector - Google Patents
Printing density detectorInfo
- Publication number
- JPS5511225A JPS5511225A JP8407878A JP8407878A JPS5511225A JP S5511225 A JPS5511225 A JP S5511225A JP 8407878 A JP8407878 A JP 8407878A JP 8407878 A JP8407878 A JP 8407878A JP S5511225 A JPS5511225 A JP S5511225A
- Authority
- JP
- Japan
- Prior art keywords
- outputs
- output
- toner
- printing
- photo detector
- 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
Landscapes
- Control Or Security For Electrophotography (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
- Dry Development In Electrophotography (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
Abstract
PURPOSE:To detect printing densities by separating the detection outputs of toner marks and portions other than these from photo detector outputs, dividing the outputs of the latter to the ratio of an allowable threshold level and ideal maximum output level and comparing these with the toner mark detection outputs. CONSTITUTION:This is the device of reflecting the light from a light emitting element 21 on a printing face 7, entering the same to a photo detector 22 and detecting printing densities from the increase and decrease thereof, whereby the output of the photo detector 22 is applied to input terminal 26. And the change component of the time when a toner mark 25 is detected is cut off with a low-pass filter 27. This output is divided to the ratio of an allowable threshold level and an ideal maximum output in the state where there are no stains, by a voltage dividing circuit 28 of resistances R1, R2. Comparison of these outputs and the detection output of the toner mark 25 is accomplished in a comparator 29, so that the judgement of the printing densities is pulse-generated. The pulse is then detected with a pulse generation monitor 30. Hence, the printing density detector stable to the decreased sensitivity owing to paper dust and floating toner may be obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8407878A JPS5511225A (en) | 1978-07-12 | 1978-07-12 | Printing density detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8407878A JPS5511225A (en) | 1978-07-12 | 1978-07-12 | Printing density detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5511225A true JPS5511225A (en) | 1980-01-26 |
JPS619630B2 JPS619630B2 (en) | 1986-03-25 |
Family
ID=13820444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8407878A Granted JPS5511225A (en) | 1978-07-12 | 1978-07-12 | Printing density detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5511225A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5729487A (en) * | 1980-07-29 | 1982-02-17 | Fujitsu Ltd | Decision of concentration of ribbon color |
JPS57159664A (en) * | 1981-03-27 | 1982-10-01 | Fujitsu Ltd | Automatic adjustment system of printing density |
JPS57176075A (en) * | 1980-12-22 | 1982-10-29 | Ibm | Method of sensing variation of light reflectivity |
JPS5835550A (en) * | 1981-08-28 | 1983-03-02 | Fujitsu Ltd | Toner density detection |
JPS5865281U (en) * | 1981-10-26 | 1983-05-02 | 三立化学株式会社 | Appropriate amount discharge container |
JPS5876832A (en) * | 1981-11-02 | 1983-05-10 | Konishiroku Photo Ind Co Ltd | Metallic image forming material |
JPS5879737U (en) * | 1981-11-24 | 1983-05-30 | 日本電気株式会社 | Print density control device |
JPS63168459U (en) * | 1987-08-20 | 1988-11-02 | ||
JPH02188360A (en) * | 1989-01-10 | 1990-07-24 | Nec Corp | Paper jam detecting mechanism |
JPH05312551A (en) * | 1992-05-11 | 1993-11-22 | Nippon Paper Ind Co Ltd | Method for measuring impurities |
US6914483B2 (en) | 2002-02-28 | 2005-07-05 | Fujitsu Limited | High-frequency amplifier circuit |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62157895U (en) * | 1986-03-28 | 1987-10-07 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026643A (en) * | 1975-08-22 | 1977-05-31 | Xerox Corporation | Apparatus and method for measurement of the ratio of toner particle electrostatic charge to toner particle mass in electrostatographic devices |
-
1978
- 1978-07-12 JP JP8407878A patent/JPS5511225A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026643A (en) * | 1975-08-22 | 1977-05-31 | Xerox Corporation | Apparatus and method for measurement of the ratio of toner particle electrostatic charge to toner particle mass in electrostatographic devices |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5729487A (en) * | 1980-07-29 | 1982-02-17 | Fujitsu Ltd | Decision of concentration of ribbon color |
JPH029948B2 (en) * | 1980-07-29 | 1990-03-06 | Fujitsu Ltd | |
JPH0128940B2 (en) * | 1980-12-22 | 1989-06-06 | Intaanashonaru Bijinesu Mashiinzu Corp | |
JPS57176075A (en) * | 1980-12-22 | 1982-10-29 | Ibm | Method of sensing variation of light reflectivity |
JPS57159664A (en) * | 1981-03-27 | 1982-10-01 | Fujitsu Ltd | Automatic adjustment system of printing density |
JPS5835550A (en) * | 1981-08-28 | 1983-03-02 | Fujitsu Ltd | Toner density detection |
JPS5865281U (en) * | 1981-10-26 | 1983-05-02 | 三立化学株式会社 | Appropriate amount discharge container |
JPS5876832A (en) * | 1981-11-02 | 1983-05-10 | Konishiroku Photo Ind Co Ltd | Metallic image forming material |
JPS5879737U (en) * | 1981-11-24 | 1983-05-30 | 日本電気株式会社 | Print density control device |
JPS63168459U (en) * | 1987-08-20 | 1988-11-02 | ||
JPH0432689Y2 (en) * | 1987-08-20 | 1992-08-06 | ||
JPH02188360A (en) * | 1989-01-10 | 1990-07-24 | Nec Corp | Paper jam detecting mechanism |
JPH05312551A (en) * | 1992-05-11 | 1993-11-22 | Nippon Paper Ind Co Ltd | Method for measuring impurities |
US6914483B2 (en) | 2002-02-28 | 2005-07-05 | Fujitsu Limited | High-frequency amplifier circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS619630B2 (en) | 1986-03-25 |
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