Line-illuminating device and image-scanning device
View Patent ↗A line-illuminating device comprises a white casing, a bar-shaped light guide housed within the casing, and light-emitting units provided on opposite ends of the bar-shaped light guide. The light-emitting unit has a substrate forming a circuit on which a lead wire for power supply is installed. Formed on a surface of the substrate facing the bar-shaped light guide is a window for coupling in which a green-color light-emitting diode and a blue-color light-emitting diode are installed. Likewise, the light-emitting unit has a substrate on which a lead wire for power supply is installed. Formed on a surface of the substrate facing the bar-shaped light guide is a window for coupling in which two red-color light-emitting diodes are installed.
1. A line-illuminating device comprising:
an elongate bar-shaped light guide having opposite longitudinal ends; and
light-emitting units,
wherein
the light-emitting units are provided on each of said opposite longitudinal ends of the bar-shaped light guide, each of said light-emitting units having a substrate on which only one or two-color light-emitting elements of three primary colors is installed, and
the light-emitting elements of the light-emitting units on said opposite longitudinal ends collectively satisfy all of the three primary colors.
2. The line-illuminating device according to claim 1 , wherein
the light-emitting unit on one of said ends is provided with a green-color light-emitting element and a blue-color light-emitting element,
while the light-emitting unit on the other of said ends is provided with a red-color light-emitting element.
3. An image-scanning device comprising
the line-illuminating device according to claim 2 ,
a line image sensor, and
a lens array for converging reflected light or transmitted light from a document on the line image sensor.
4. An image-scanning device according to claim 3 , comprising a pair of said line-illuminating devices.
5. The line-illuminating device according to claim 1 , wherein
the light-emitting unit on one of said ends is provided with a blue-color light-emitting element and a red-color light-emitting element,
while the light-emitting unit on the other of said ends is provided with a green-color light-emitting element and a red-color light-emitting element.
6. An image-scanning device comprising
the line-illuminating device according to claim 5 ,
a line image sensor, and
a lens array for converging reflected light or transmitted light from a document on the line image sensor.
7. An image-scanning device according to claim 6 , comprising a pair of said line-illuminating devices.
8. An image-scanning device comprising
the line-illuminating device according to claim 1 ,
a line image sensor, and
a lens array for converging reflected light or transmitted light from a document on the line image sensor.
9. An image-scanning device according to claim 8 , including a pair of said line-illuminating devices.
10. The line-illuminating device according to claim 1 , wherein
the light-emitting unit on one of said ends of the bar-shaped light guide is provided with a green-color light-emitting element and a blue-color light-emitting element,
while the light-emitting unit on the other of said ends is provided with a pair of red-color light-emitting elements.
11. A line-illuminating device comprising:
bar-shaped light guides; and
light-emitting units,
wherein
each of said light-emitting units has a substrate which is provided with three windows and three light-emitting elements of three primary colors respectively disposed in the windows, and
three said bar-shaped light guides are provided between the light-emitting units to correspond to the three windows, respectively.
12. An image-scanning device comprising
the line-illuminating device according to claim 11 ,
a line image sensor, and
a lens array for converging reflected light or transmitted light from a document on the line image sensor.
13. A line-illuminating device comprising:
a pair of light-emitting units; and
at least one bar-shaped light guide disposed between the light-emitting units;
each said light-emitting unit including a substrate, a window disposed on said substrate in which one or two-color light-emitting elements of three primary colors are installed so as to emit light toward said at least one bar-shaped light guide; and
the light-emitting elements of the pair of light-emitting units collectively satisfy all of the three primary colors.
14. The line-illuminating device according to claim 13 including one said
bar-shaped light guide, wherein
the light-emitting unit on one end of the bar-shaped light guide is provided with a green-color light-emitting element and a blue-color light-emitting element,
while the light-emitting unit on the other end is provided with a red-color light-emitting element.
15. The line-illuminating device according to claim 13 including one said bar-shaped light guide, wherein
the light-emitting unit on one end of the bar-shaped light guide is provided with a blue-color light-emitting element and a red-color light-emitting element,
while the light-emitting unit on the other end is provided with a green-color light-emitting element and a red-color light-emitting element.
16. The line-illuminating device according to claim 13 including three said bar-shaped light guides, wherein
each light-emitting unit has a substrate which is provided with three of said windows and three light-emitting elements of three primary colors respectively disposed in the windows, and
said three said bar-shaped light guides are provided between the light-emitting units to correspond to the three windows, respectively.