JPS6445695A - Electronic copier - Google Patents
Electronic copierInfo
- Publication number
- JPS6445695A JPS6445695A JP20287487A JP20287487A JPS6445695A JP S6445695 A JPS6445695 A JP S6445695A JP 20287487 A JP20287487 A JP 20287487A JP 20287487 A JP20287487 A JP 20287487A JP S6445695 A JPS6445695 A JP S6445695A
- Authority
- JP
- Japan
- Prior art keywords
- black board
- board surface
- becomes
- approaching
- periphery
- 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
Abstract
PURPOSE: To obtain clear-cut image over the whole frame even with illumination using a compact single light source by providing corrective measures against uneven recording produced between the central portion and the periphery of the copy caused by reduction of illumination intensity with a single light source at periphery of recording plane for image of a black board or the like. CONSTITUTION: Emitted light from a halogen lamp 10 is focused in slit shape through condenser lens 13 and a 1st cylindrical lens 14, reflected by a fixed mirror 15, trimmed into slit-shaped parallel beam by a 2nd cylindrical lens 16 and directed toward a scanning mirror 17. Then this reflected beam varies its transmitting position from the left to right of an ND filter 19 in response to rotation of the scanning mirror 17, and the light becomes brighter as it goes closer to right and left ends of a black board surface because transmittance of the ND filter 19 becomes higher as approaching its both ends. However, brightness of illuminating light on the black board surface becomes nearly even because distance between the electronic copier and the black board surface is short in the central portion and becomes longer as approaching its both ends.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20287487A JPS6445695A (en) | 1987-08-14 | 1987-08-14 | Electronic copier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20287487A JPS6445695A (en) | 1987-08-14 | 1987-08-14 | Electronic copier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6445695A true JPS6445695A (en) | 1989-02-20 |
Family
ID=16464627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20287487A Pending JPS6445695A (en) | 1987-08-14 | 1987-08-14 | Electronic copier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6445695A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6239538B1 (en) | 1997-09-17 | 2001-05-29 | Nec Corporation | Field emitter |
-
1987
- 1987-08-14 JP JP20287487A patent/JPS6445695A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6239538B1 (en) | 1997-09-17 | 2001-05-29 | Nec Corporation | Field emitter |
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