JPH0326151U - - Google Patents
Info
- Publication number
- JPH0326151U JPH0326151U JP8720589U JP8720589U JPH0326151U JP H0326151 U JPH0326151 U JP H0326151U JP 8720589 U JP8720589 U JP 8720589U JP 8720589 U JP8720589 U JP 8720589U JP H0326151 U JPH0326151 U JP H0326151U
- Authority
- JP
- Japan
- Prior art keywords
- light
- amount
- image forming
- document
- detected
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Optical Systems Of Projection Type Copiers (AREA)
Description
第１図は本考案の画像形成装置の一実施例の構
成図、第２図は第１図の画像形成装置の部分拡大
図、第３図は第１図の画像形成装置の部分概略平
面図、第４図は光検知部の一例を示す図、第５図
は第４図の光検知部のコンパレータからの出力信
号ＯＵＴを示す図である。
１……スキヤナユニツト、２……露光ランプ、
３……光検知部、４，２０，２１，２３……ミラ
ー、５……照射面、６……原稿、７……コンタク
トガラス、８……黒色部材、９……白色塗料、２
２……レンズ、２４……感光体、２５……レジス
トローラ、ＳＢ……スリツト状光ビーム、Ａ……
画像形成可能域、Ｂ……画像形成可能域の外側の
領域。
FIG. 1 is a block diagram of an embodiment of the image forming apparatus of the present invention, FIG. 2 is a partially enlarged view of the image forming apparatus shown in FIG. 1, and FIG. 3 is a partial schematic plan view of the image forming apparatus shown in FIG. 1. , FIG. 4 is a diagram showing an example of a photodetection section, and FIG. 5 is a diagram showing an output signal OUT from a comparator of the photodetection section in FIG. 4. 1...Scanner unit, 2...Exposure lamp,
3... Light detection unit, 4, 20, 21, 23... Mirror, 5... Irradiation surface, 6... Original, 7... Contact glass, 8... Black member, 9... White paint, 2
2... Lens, 24... Photoconductor, 25... Registration roller, SB... Slit-shaped light beam, A...
Image formable area, B... area outside the image formable area.
Claims (1)
の照射面からの反射光の光量を検知する光検知手
段をスキヤンユニツトに配置し、前記照射面は、
画像形成可能域の外側の領域が原稿の先端が位置
決めされる副走査方向の所定の位置を境界にして
互いに異なる反射率の材料で形成されており、前
記光検知手段は、前記照射面のうち前記画像形成
可能域の外側の領域からの反射光の光量を検知し
、該反射光の光量の変化が生じた位置を原稿の露
光開始位置として検出するようになつていること
を特徴とする画像形成装置。 A light detection means for detecting the amount of light reflected from the irradiation surface of the slit-shaped light beam emitted from the exposure lamp is disposed in the scan unit, and the irradiation surface is
The area outside the image forming area is formed of materials having different reflectances with respect to a predetermined position in the sub-scanning direction where the leading edge of the document is positioned as a boundary, and the light detecting means is configured to detect a part of the irradiated surface. An image characterized in that the amount of reflected light from an area outside the image forming area is detected, and the position where the amount of reflected light changes is detected as the exposure start position of the document. Forming device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8720589U JPH0326151U (en) | 1989-07-25 | 1989-07-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8720589U JPH0326151U (en) | 1989-07-25 | 1989-07-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0326151U true JPH0326151U (en) | 1991-03-18 |
Family
ID=31636855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8720589U Pending JPH0326151U (en) | 1989-07-25 | 1989-07-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0326151U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006030464A (en) * | 2004-07-14 | 2006-02-02 | Nec Corp | Audio output device, character image display device, audio output method, and character image display method |
-
1989
- 1989-07-25 JP JP8720589U patent/JPH0326151U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006030464A (en) * | 2004-07-14 | 2006-02-02 | Nec Corp | Audio output device, character image display device, audio output method, and character image display method |
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