JPS5444518A - Lighting unit for copier - Google Patents
Lighting unit for copierInfo
- Publication number
- JPS5444518A JPS5444518A JP11112677A JP11112677A JPS5444518A JP S5444518 A JPS5444518 A JP S5444518A JP 11112677 A JP11112677 A JP 11112677A JP 11112677 A JP11112677 A JP 11112677A JP S5444518 A JPS5444518 A JP S5444518A
- Authority
- JP
- Japan
- Prior art keywords
- document
- lighting
- plane
- speed
- scanning
- 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
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Optical Systems Of Projection Type Copiers (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
Abstract
PURPOSE: To enhance the lighting efficiency and scan an original document at high speed by synchronizing the distance less than the scanning distance of the original document in the region of a slitlike exposure with its optical scanning, and moving an oriented lighting source.
CONSTITUTION: A pair of lighting sources 32, 33 having the orientation disposed below the original document tray 31 move parallel to the document as far as the position shown by the chain lines 32A, 33A. Reflecting light from the document is projected on the drum-like photoreceptor 41, when a pair of mirrors 39, 40 move to the position shown in the chain line at speed Vm one-half of the circumferential speed Vp of the photoreceptor 41, the moving speed of slit lighted on the document plane is equal to Vp. And the scanning length Lo of the document plane and the scanning distance L1 of lamps 34, 35 of the lighting source are in the relation of L0>L1. If the incident angle (oriented direction) of the lighting light is changed from θ to θ, the lighting lights from two lamps cross together on the slit of the document plane. Thus the lighting efficiency on the document plane is enhanced and the document can be scanned at high speed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11112677A JPS5444518A (en) | 1977-09-14 | 1977-09-14 | Lighting unit for copier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11112677A JPS5444518A (en) | 1977-09-14 | 1977-09-14 | Lighting unit for copier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5444518A true JPS5444518A (en) | 1979-04-09 |
Family
ID=14553091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11112677A Pending JPS5444518A (en) | 1977-09-14 | 1977-09-14 | Lighting unit for copier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5444518A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4461565A (en) * | 1979-04-16 | 1984-07-24 | Canon Kabushiki Kaisha | Optical scanning device |
-
1977
- 1977-09-14 JP JP11112677A patent/JPS5444518A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4461565A (en) * | 1979-04-16 | 1984-07-24 | Canon Kabushiki Kaisha | Optical scanning device |
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