JPS55116170A - Lighting unit for photo information input device - Google Patents
Lighting unit for photo information input deviceInfo
- Publication number
- JPS55116170A JPS55116170A JP2374479A JP2374479A JPS55116170A JP S55116170 A JPS55116170 A JP S55116170A JP 2374479 A JP2374479 A JP 2374479A JP 2374479 A JP2374479 A JP 2374479A JP S55116170 A JPS55116170 A JP S55116170A
- Authority
- JP
- Japan
- Prior art keywords
- shaped light
- emitting elements
- light emitting
- plate
- lighted
- 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
- Character Input (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To light effectively only a document surface as an object to be lighted, by constituting a horn-shaped light source by combining plate-shaped light emitting elements in three dimensions.
CONSTITUTION: In front of an optical system composed of scanning-type photosensor 1 and lens 2, a couple of the 1st plate-shaped light emitting elements 6a are arranged at an angle nearly equal to scanning angle θ1 of the optical system, and another couple of the 2nd plate-shaped light emitting elements 6b are also arranged at an angle nearly equal to visual-field angle θ2 of the optical system, thereby constituting a horn-shaped lighting source. Therefore, the beam density of each part of plate-shaped light emitting elements 6a and 6b is even. The radiation of light is put into effect as to only internal surfaces, so that a document surface only as a lighted object can be lighted effectively.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2374479A JPS55116170A (en) | 1979-02-28 | 1979-02-28 | Lighting unit for photo information input device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2374479A JPS55116170A (en) | 1979-02-28 | 1979-02-28 | Lighting unit for photo information input device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55116170A true JPS55116170A (en) | 1980-09-06 |
Family
ID=12118809
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2374479A Pending JPS55116170A (en) | 1979-02-28 | 1979-02-28 | Lighting unit for photo information input device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55116170A (en) |
-
1979
- 1979-02-28 JP JP2374479A patent/JPS55116170A/en active Pending
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