JPS6258453U - - Google Patents
Info
- Publication number
- JPS6258453U JPS6258453U JP8681486U JP8681486U JPS6258453U JP S6258453 U JPS6258453 U JP S6258453U JP 8681486 U JP8681486 U JP 8681486U JP 8681486 U JP8681486 U JP 8681486U JP S6258453 U JPS6258453 U JP S6258453U
- Authority
- JP
- Japan
- Prior art keywords
- light
- copying machine
- electrostatic copying
- detection
- density
- 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 12
- 239000011521 glass Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Holders For Sensitive Materials And Originals (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Of Exposure In Printing And Copying (AREA)
Description
【図面の簡単な説明】
第1図は本考案に係る静電複写機の実施例を示
す概略図、第2図は制御手段の実施例を示すブロ
ツク図、第3図は遮光部の実施例を示す底面図、
第4図は本考案による露光動作時の露光量を示す
特性図、第5図は従来装置による露光動作時の露
光量を示す特性図である。
1……コンタクトガラス、2……光学系部、4
……制御手段、27……原稿濃度検出手段、51
……白色遮光部、52……灰色遮光部。[Brief Description of the Drawings] Fig. 1 is a schematic diagram showing an embodiment of an electrostatic copying machine according to the present invention, Fig. 2 is a block diagram showing an embodiment of the control means, and Fig. 3 is an embodiment of the light shielding section. bottom view showing
FIG. 4 is a characteristic diagram showing the exposure amount during the exposure operation according to the present invention, and FIG. 5 is a characteristic diagram showing the exposure amount during the exposure operation using the conventional apparatus. 1...Contact glass, 2...Optical system section, 4
...Controlling means, 27...Document density detection means, 51
...White light shielding part, 52...Gray light shielding part.
Claims (1)
する光学系部と、上記原稿の濃度を検出する検出
手段と、この検出手段から出力される検出信号に
応じて複写濃度を制御する制御手段とを有し、原
稿の先端部が載置されるコンタクトガラスの基準
位置に白色遮光部が形成されてなる静電複写機に
おいて、上記白色遮光部のうち少なくとも上記検
出手段の検出位置に対応する部分に、反射光量が
上記白色遮光部による反射光量より少ない色彩遮
光部を設けたことを特徴とする静電複写機。 2 色彩遮光部は平均的な原稿の濃度に相当する
明度を有する灰色遮光部であることを特徴とする
実用新案登録請求の範囲第1項記載の静電複写機
。 3 色彩遮光部は、検出手段の感度波長帯域以外
の波長を有する色彩であることを特徴とする実用
新案登録請求の範囲第1項記載の静電複写機。 4 色彩遮光部は、原稿の先端基準となる位置よ
りも外方に配設されたことを特徴とする実用新案
登録請求の範囲第1項記載の静電複写機。 5 原稿の濃度を検出する検出手段は、光学系部
により原稿を露光したときの反射光の光量を検出
するように構成されたことを特徴とする実用新案
登録請求の範囲第1項記載の静電複写機。 6 制御手段は、複写濃度の制御のために露光ラ
ンプの光量を制御するように構成されたことを特
徴とする実用新案登録請求の範囲第1項記載の静
電複写機。 7 制御手段は、上記原稿濃度検出手段からの検
出信号が入力されてこれを電圧信号に変換する光
量検出回路と、基準電圧回路と、上記光量検出回
路から出力された電圧信号と上記基準電圧回路か
ら出力された基準電圧とを比較する比較回路と、
露光ランプに制限値以上の電圧が印加されないよ
うにする制限回路と、上記比較回路の出力が入力
され露光ランプの光量を決定するランプ電圧発生
回路とから構成されたことを特徴とする実用新案
登録請求の範囲第6項記載の静電複写機。 8 制御手段は、複写濃度の制御のために現像部
のバイアス電圧を制御するように構成されたこと
を特徴とする実用新案登録請求の範囲第1項記載
の静電複写機。[Scope of Claim for Utility Model Registration] 1. An optical system unit that exposes a document placed on a contact glass, a detection device that detects the density of the document, and a method for copying in accordance with a detection signal output from the detection device. In an electrostatic copying machine, the electrostatic copying machine has a control means for controlling density, and a white light-shielding portion is formed at a reference position of a contact glass on which a leading edge of a document is placed, at least the detection means of the white light-shielding portion. An electrostatic copying machine characterized in that a color light shielding part is provided in a portion corresponding to the detection position of the color light shielding part, the amount of reflected light being smaller than the amount of light reflected by the white light shielding part. 2. The electrostatic copying machine according to claim 1, wherein the color light-shielding portion is a gray light-shielding portion having a brightness corresponding to the density of an average original. 3. The electrostatic copying machine according to claim 1, wherein the color light-shielding portion has a color having a wavelength outside the sensitivity wavelength band of the detection means. 4. The electrostatic copying machine according to claim 1, wherein the color light-shielding portion is disposed outward from a position serving as a reference leading edge of the document. 5. The utility model registration claim 1, wherein the detection means for detecting the density of the original is configured to detect the amount of reflected light when the original is exposed by an optical system section. Electric copying machine. 6. The electrostatic copying machine according to claim 1, wherein the control means is configured to control the amount of light from the exposure lamp in order to control the copy density. 7. The control means includes a light amount detection circuit that receives a detection signal from the document density detection means and converts it into a voltage signal, a reference voltage circuit, and a voltage signal output from the light amount detection circuit and the reference voltage circuit. a comparison circuit that compares the reference voltage output from the
Registration of a utility model characterized in that it is comprised of a limiting circuit that prevents a voltage exceeding a limit value from being applied to the exposure lamp, and a lamp voltage generation circuit that receives the output of the comparison circuit and determines the light amount of the exposure lamp. An electrostatic copying machine according to claim 6. 8. The electrostatic copying machine according to claim 1, wherein the control means is configured to control the bias voltage of the developing section in order to control the copy density.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986086814U JPH0526584Y2 (en) | 1985-06-17 | 1986-06-06 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9137085 | 1985-06-17 | ||
JP1986086814U JPH0526584Y2 (en) | 1985-06-17 | 1986-06-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6258453U true JPS6258453U (en) | 1987-04-11 |
JPH0526584Y2 JPH0526584Y2 (en) | 1993-07-06 |
Family
ID=33133252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1986086814U Expired - Lifetime JPH0526584Y2 (en) | 1985-06-17 | 1986-06-06 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0526584Y2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6219654U (en) * | 1985-07-22 | 1987-02-05 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5436502A (en) * | 1977-08-26 | 1979-03-17 | Hitachi Ltd | Insulation structure for winding end in electric machine |
JPS58172654A (en) * | 1982-04-02 | 1983-10-11 | Canon Inc | Control device of image recording |
JPS5965832A (en) * | 1982-10-08 | 1984-04-14 | Canon Inc | Control device of image recording |
JPS59204054A (en) * | 1983-05-06 | 1984-11-19 | Canon Inc | Copying machine |
JPS6022135A (en) * | 1983-07-18 | 1985-02-04 | Canon Inc | Potential control method of electrophotographic device |
JPS6054143U (en) * | 1983-09-20 | 1985-04-16 | キヤノン株式会社 | image recording device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6054143B2 (en) * | 1982-05-26 | 1985-11-28 | 理化学研究所 | How to start a plasma torch with a cathode jacket |
-
1986
- 1986-06-06 JP JP1986086814U patent/JPH0526584Y2/ja not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5436502A (en) * | 1977-08-26 | 1979-03-17 | Hitachi Ltd | Insulation structure for winding end in electric machine |
JPS58172654A (en) * | 1982-04-02 | 1983-10-11 | Canon Inc | Control device of image recording |
JPS5965832A (en) * | 1982-10-08 | 1984-04-14 | Canon Inc | Control device of image recording |
JPS59204054A (en) * | 1983-05-06 | 1984-11-19 | Canon Inc | Copying machine |
JPS6022135A (en) * | 1983-07-18 | 1985-02-04 | Canon Inc | Potential control method of electrophotographic device |
JPS6054143U (en) * | 1983-09-20 | 1985-04-16 | キヤノン株式会社 | image recording device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6219654U (en) * | 1985-07-22 | 1987-02-05 |
Also Published As
Publication number | Publication date |
---|---|
JPH0526584Y2 (en) | 1993-07-06 |
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