CONTACT IMAGE SENSOR MODULE

Abstract

A contact image sensor module for scanning the image of a planar object comprises a white organic electroluminescent device, a plurality of cylindrical lenses, a color filter, and a contact image-sensing element. The white organic electroluminescent device emits white light which illuminates the planar object to result in reflected light. The cylindrical lenses direct the reflected light to the color filter, and the filtered light forms an image in the contact image-sensing element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described according to the appended drawings in which:

FIG. 1 is prospective view of a conventional contact image sensor module;

FIG. 2 is an exploded view of a contact image sensor module in accordance with the invention;

FIG. 3 is an assembly view of a contact image sensor module in accordance with the invention; and

FIG. 4 is a cross-sectional view of FIG. 3 taken along section line 1-1.

PREFERRED EMBODIMENT OF THE PRESENT INVENTION

FIG. 2 is an exploded view of a contact image sensor module in accordance with the invention. As shown in FIG. 2, the contact image sensor module 20 comprises a white organic electroluminescent device 21 that emits white light and is fixed at the bottom of a holder 24 and a lens set 23 that comprises a plurality of lenses 231 (e.g. cylindrical lenses) aligned with each other and is also disposed on the holder 24. The lens set 23 can direct the reflected white light toward a color filter 27 disposed at the bottom of the holder 24. The lens set 23 comprising a plurality of lenses 231 can also be substituted by a unitarily-formed optical element.

The band areas 271, 272, and 273 are formed on the color filter 27 in a manner such that they are periodically arranged in sequence, and allow respectively red, green and blue light to pass through. Red, green and blue light passing through the color filter 27 can enter the contact image-sensing element 26 simultaneously, thus shortening the time required to scan a document image as compared to the prior art. The contact image-sensing element 26 is fixed on a printed circuit board 25 and comprises a plurality of contact image sensors 261 arranged along a straight line.

FIG. 3 shows an assembly view of a contact image sensor module in accordance with the invention. As shown in FIG. 3, a room is disposed at the bottom of the holder 24, and encloses the color filter 27, image-sensing element 26, and printed circuit board 25.

FIG. 4 is a cross-sectional view of FIG. 3 taken along section line 1-1. The white light emitted by the white organic electroluminescent device 21 illuminates the planar object 80 to be scanned, and the surface of the planar object 80 reflects the light to the lens unit 23. The lens unit 23 directs the reflected light toward the color filter 27 and the image-sensing element 26. A linear optical image formed therein is converted into digital image signals by the image-sensing element 26. The printed circuit board 25 that fixes the image-sensing element 26 transmits the digital image signals to the outside of the module.

The above descriptions of the present invention are intended to be illustrative only. Numerous alternative methods may be devised by persons skilled in the art without departing from the scope of the following claims.

Claims

1. A contact image sensor module for scanning an image of a planar object, comprising: a white organic electroluminescent device for emitting white light and illuminating the planar object;a color filter allowing light of specific colors to pass corresponding regions;a lens set for directing light that is the white light reflected from the planar object to the color filter; anda contact image-sensing element for sensing light of specific colors that transmit through the color filter and generating image signals.

2. The contact image sensor module according to claim 1, wherein the lens set comprises a plurality of cylindrical lenses aligned with each other.

3. The contact image sensor module according to claim 1, wherein the color filter has band areas that allow respectively red, green and blue light to pass through and are periodically arranged in sequence.

4. The contact image sensor module according to claim 1, wherein the specific colors are red, green and blue.

5. The contact image sensor module according to claim 1, further comprising a holder on which the white organic electroluminescent device and the lens are fixed.

6. The contact image sensor module according to claim 1, further comprising a circuit board on which the contact image-sensing element is fixed.

7. The contact image sensor module according to claim 1, wherein the contact image-sensing element comprises a plurality of contact image sensors aligned with each other.

8. The contact image sensor module according to claim 1, wherein the lens set is a unitarily-formed optical element.