Patent Application
20070297020
The characteristics and the technical contents of the present invention will be further understood in view of the detailed description and accompanying drawings. However, it should be noted that the drawings are illustrative, but not used to limit the scope of the present invention. Wherein:
Referring to
The contact image-sensing element 20 is mounted on the printed circuit board 10. The contact image-sensing element 20 is a single contact image-sensing element or is comprised of a plurality of contact image-sensing elements arranged in a line. Furthermore, the rod lens 30 is comprised of a plurality of column-shaped lenses arranged in a line. The white LED element 40 is provided on one side of the rod lens 30, and the white LED element 40 is comprised of a plurality of the white LEDs arranged in a line. Additionally, the white LED element 40 can be made of a blue LED and phosphor, or a red LED, a green LED, and a blue LED turned on at the same time.
The contact image-sensing element 20 is composed of many pixels 22. Each pixel 22 has four photodiodes. One photodiode of the pixel that is not coated with the coating layer is non-coated photodiode 23. The other three photodiodes of the pixel that are coated with the coating layers 21 that contain three colors of red, green and blue respectively are called coated photodiodes 24. The contact image-sensing element 20 has two operating mode: mono mode, and color mode. When the contact image-sensing element operates in the mono mode, the non-coated photodiode 23 of the pixel is activated, and the other three coated photodiodes 24 of the pixel are not activated. There are only one signal output terminal at this mono mode. On the other hand, when the contact image-sensing element operates in the color mode, the non-coated photodiode 23 of the pixel is not activated, and the other three coated photodiodes 24 of the pixel are activated. There are three signal output terminals, a red signal output terminal, a green signal output terminal, and a blue signal output terminal at this color mode. All the three signal output terminals output data synchronously to achieve high speed transmission.
The white LED element 40 emits a light beam (such a light beam can be directly obtained from a white LED or indirectly obtained by mixing up the lights emitted from the red, green and blue LEDs or mixing up the lights emitted from the blue LED and phosphor) to a document D to generate a light reflected from the document D to the contact image-sensing element, and thus the contact image-sensing element 20 can sense the image of the document via the rod lens 30.
According to the present invention, the image-sensing module further comprises a glass 50 provided above the rod lens 30 and the white LED element 40. Furthermore, the printed circuit board 10, contact image-sensing element 20, rod lens 30, white LED element 40 and glass 50 are accommodated inside the shell 60.
To sum up, according to the present invention, the image-sensing module has the following advantages: fast scanning, color scanning, tiny volume, only DC supply required, no warming-up for the light source thanks to the white LEDs, and thus greatly improve the scanning efficiency of the image-sensing module.
Although the present invention has been described with reference to the foregoing preferred embodiment, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still be occurred to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.
