JPS6450072A - Automatic density adjusting device of image forming device - Google Patents
Automatic density adjusting device of image forming deviceInfo
- Publication number
- JPS6450072A JPS6450072A JP62207607A JP20760787A JPS6450072A JP S6450072 A JPS6450072 A JP S6450072A JP 62207607 A JP62207607 A JP 62207607A JP 20760787 A JP20760787 A JP 20760787A JP S6450072 A JPS6450072 A JP S6450072A
- Authority
- JP
- Japan
- Prior art keywords
- density
- original
- effective detection
- detection area
- area
- 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
- Holders For Sensitive Materials And Originals (AREA)
- Developing For Electrophotography (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To make a proper automatic density adjustment without any prescanning by varying the size of an effective detection area according to a specified trimming area. CONSTITUTION:A lamp 4, a carriage 7, an optical fiber 20, a photodetecting element 29, and a peak holding circuit 27 constitute a density detecting means, which detects density information on the effective detection area of an original O optically when the original O is lighted and scanned, and converts it into an electric signal. A control means CPU 28 processes the density information generated by this density detecting means and controls a developing bias, etc., to adjust and control the image density of a recording image. Then the size of the effective detection area is varied according to the specified trimming area. Thus, when the original is lighted and scanned, the density information in the trimming area is detected and the density of the recording image is adjusted according to the result, so the accuracy of the automatic density adjustment is improved without any prescanning.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62207607A JP2677357B2 (en) | 1987-08-21 | 1987-08-21 | Automatic density adjusting device in image forming apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62207607A JP2677357B2 (en) | 1987-08-21 | 1987-08-21 | Automatic density adjusting device in image forming apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6450072A true JPS6450072A (en) | 1989-02-27 |
JP2677357B2 JP2677357B2 (en) | 1997-11-17 |
Family
ID=16542580
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62207607A Expired - Fee Related JP2677357B2 (en) | 1987-08-21 | 1987-08-21 | Automatic density adjusting device in image forming apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2677357B2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6295554A (en) * | 1985-10-22 | 1987-05-02 | Canon Inc | Image forming device |
JPS62113177A (en) * | 1985-11-13 | 1987-05-25 | Ricoh Co Ltd | Original density detector in image forming device |
JPS638759A (en) * | 1986-06-30 | 1988-01-14 | Mita Ind Co Ltd | Image density controller |
-
1987
- 1987-08-21 JP JP62207607A patent/JP2677357B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6295554A (en) * | 1985-10-22 | 1987-05-02 | Canon Inc | Image forming device |
JPS62113177A (en) * | 1985-11-13 | 1987-05-25 | Ricoh Co Ltd | Original density detector in image forming device |
JPS638759A (en) * | 1986-06-30 | 1988-01-14 | Mita Ind Co Ltd | Image density controller |
Also Published As
Publication number | Publication date |
---|---|
JP2677357B2 (en) | 1997-11-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |