JPS5592072A - Photoelectric conversion unit - Google Patents
Photoelectric conversion unitInfo
- Publication number
- JPS5592072A JPS5592072A JP16238278A JP16238278A JPS5592072A JP S5592072 A JPS5592072 A JP S5592072A JP 16238278 A JP16238278 A JP 16238278A JP 16238278 A JP16238278 A JP 16238278A JP S5592072 A JPS5592072 A JP S5592072A
- Authority
- JP
- Japan
- Prior art keywords
- illumination
- light source
- original
- fresnel lens
- intensity
- 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 improve illumination efficiency and make it possible to make a unit small-size and long-life by using an illumination light source where a Fresnel lens and a plate-shaped light source are combined.
CONSTITUTION: The luminous light flux of EL light source 13 is condensed by Fresnel lens 16, and this light flux is illuminated to original 2 through holding prism 14. The reflection light is led to image sensor 4 through fiber 5 and is subjected to photo electric conversion. Here, the effect of the Fresnel lens is as described below. For example, when EL light source 13 is 150mm long and 10mm wide and 100 feet- lambert luminance and the distance between the original and the light source is 10mm. the illumination range on the original is extended over 20mm and the intensity of illumination becomes approximately 200lux. However, when the Fresnel lens is used, the illumination range on the original can be condensed to approximately 2∼5mm, and the intensity of illumination on the original surface is improved three or more times as high as the conventional unit even if the transmission loss of the Fresnel lens is considered. Thus, the intensity of illumination is improved considerably, and illumination efficiency is enhanced.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16238278A JPS5592072A (en) | 1978-12-29 | 1978-12-29 | Photoelectric conversion unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16238278A JPS5592072A (en) | 1978-12-29 | 1978-12-29 | Photoelectric conversion unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5592072A true JPS5592072A (en) | 1980-07-12 |
Family
ID=15753508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16238278A Pending JPS5592072A (en) | 1978-12-29 | 1978-12-29 | Photoelectric conversion unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5592072A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02181474A (en) * | 1989-01-06 | 1990-07-16 | Sharp Corp | Picture image reader |
JPH06217083A (en) * | 1993-01-19 | 1994-08-05 | Matsushita Graphic Commun Syst Inc | Original reader |
JP2009145455A (en) * | 2007-12-12 | 2009-07-02 | Konica Minolta Business Technologies Inc | Light source device and image reading device equipped with it |
-
1978
- 1978-12-29 JP JP16238278A patent/JPS5592072A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02181474A (en) * | 1989-01-06 | 1990-07-16 | Sharp Corp | Picture image reader |
JPH06217083A (en) * | 1993-01-19 | 1994-08-05 | Matsushita Graphic Commun Syst Inc | Original reader |
JP2009145455A (en) * | 2007-12-12 | 2009-07-02 | Konica Minolta Business Technologies Inc | Light source device and image reading device equipped with it |
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