JPH0224854U - - Google Patents
Info
- Publication number
- JPH0224854U JPH0224854U JP10297388U JP10297388U JPH0224854U JP H0224854 U JPH0224854 U JP H0224854U JP 10297388 U JP10297388 U JP 10297388U JP 10297388 U JP10297388 U JP 10297388U JP H0224854 U JPH0224854 U JP H0224854U
- Authority
- JP
- Japan
- Prior art keywords
- density
- exposure
- image
- original
- photoreceptor
- 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
- 108091008695 photoreceptors Proteins 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000006866 deterioration Effects 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
Description
第１図は本考案の一実施例を示す図、第２図は
本考案に用いる光センサーの分光感度を示す図、
第３図は電圧増幅変換回路を示す図、第４図は本
考案における原稿濃度と原稿露光量またはバイア
ス量との関係を示す図、第５図は画像濃度と画像
濃度検知センサとの比較フロー図である。
１……原稿、２……コンタクトガラス、４……
圧板、５……スキヤナーユニツト、６，２３……
光源、７……スリツト、８乃至１３……光学ミラ
ー、１４……レンズ、１５……感光体、１６……
トナー現像部、１７……トナー定着部、２０……
複写紙、２１，２４……ホトダイオード、２２…
…原稿濃度検知センサー、２５……画像濃度検知
センサー、３０……増幅器、３１……抵抗、３２
……コンデンサ、４０，４１……用紙カセツト。
Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing the spectral sensitivity of the optical sensor used in the present invention,
Figure 3 is a diagram showing a voltage amplification conversion circuit, Figure 4 is a diagram showing the relationship between original density and original exposure amount or bias amount in the present invention, and Figure 5 is a comparison flow of image density and image density detection sensor. It is a diagram. 1... Original, 2... Contact glass, 4...
Pressure plate, 5... Scanner unit, 6, 23...
Light source, 7... Slit, 8 to 13... Optical mirror, 14... Lens, 15... Photoreceptor, 16...
Toner developing section, 17... Toner fixing section, 20...
Copy paper, 21, 24...Photodiode, 22...
...Original density detection sensor, 25...Image density detection sensor, 30...Amplifier, 31...Resistor, 32
... Capacitor, 40, 41 ... Paper cassette.
Claims (1)
る光センサーで原稿の地肌濃度を検知する原稿濃
度検知手段と、感光体への露光と露光量を制御す
る露光制御手段と、複写用紙に転写された画像濃
度を検知する画像濃度検知手段とを具え、複写前
の原稿の地肌濃度及び複写用紙に転写された画像
濃度とを検出比較することにより感光体の残留電
位の増加等による画像形成の劣化を検出し、該検
出結果に基づいて次の複写工程における露光量或
は画像電極電位のバイアス量を制御することを特
徴とした画像濃度制御装置。 an original density detection means for detecting the background density of the original using an optical sensor having spectral sensitivity in the peak spectral sensitivity region of the photoreceptor; an exposure control means for controlling the exposure to the photoreceptor and the amount of exposure; The image density detecting means detects the image density, and detects and compares the background density of the original before copying and the image density transferred to copy paper to prevent deterioration of image formation due to an increase in the residual potential of the photoreceptor, etc. An image density control device characterized by detecting and controlling the exposure amount or the bias amount of the image electrode potential in the next copying process based on the detection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988102973U JPH08674Y2 (en) | 1988-08-03 | 1988-08-03 | Image density control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988102973U JPH08674Y2 (en) | 1988-08-03 | 1988-08-03 | Image density control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0224854U true JPH0224854U (en) | 1990-02-19 |
| JPH08674Y2 JPH08674Y2 (en) | 1996-01-10 |
Family
ID=31333370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988102973U Expired - Lifetime JPH08674Y2 (en) | 1988-08-03 | 1988-08-03 | Image density control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08674Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6049351A (en) * | 1983-08-27 | 1985-03-18 | Mita Ind Co Ltd | Image output device |
| JPS62281676A (en) * | 1986-05-30 | 1987-12-07 | Canon Inc | Picture density adjusting device |
-
1988
- 1988-08-03 JP JP1988102973U patent/JPH08674Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6049351A (en) * | 1983-08-27 | 1985-03-18 | Mita Ind Co Ltd | Image output device |
| JPS62281676A (en) * | 1986-05-30 | 1987-12-07 | Canon Inc | Picture density adjusting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08674Y2 (en) | 1996-01-10 |
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