CN201260199Y

CN201260199Y - Contact type image sensor

Info

Publication number: CN201260199Y
Application number: CNU2008201723652U
Authority: CN
Inventors: 泽江哲则; 张文波; 王虎岩
Original assignee: Weihai Hualing Opto Electronics Co Ltd
Current assignee: Weihai Hualing Opto Electronics Co Ltd
Priority date: 2008-09-27
Filing date: 2008-09-27
Publication date: 2009-06-17
Anticipated expiration: 2018-09-27

Abstract

The utility model discloses a contact type image sensor which eliminates interference, and the contact type image sensor comprises a sensor base plate, wherein sensitization parts arranged in a straight line are carried on the sensor base plate; a lens is arranged on the sensitization parts of the sensor base plate; one side of the lens is provided with a light source and a framework; the framework can accommodate the sensor base plate, the lens and the light source; and the upper part of the framework is provided with a light-passing plate carrying a manuscript. The contact type image sensor is characterized in that a polarizing film having polarizing effect is pasted on the inner surface of the light-passing plate; useless or harmful lights in other directions are filtered when the lights emitted by the light source pass through the polarizing film; and the lights going in the light-passing plate have good directivity, and so the lights irradiating the manuscript through the light-passing plate have good directivity. The utility model selects the directions of the light by adjusting the polarizing film, and so effectively eliminates anti-fake reticulate pattern or other anti-fake signs, or reads given image information in pointed and selective mode.

Description

Contact-type image sensor

Technical field:

The utility model relates to a kind of image read-out, particularly a kind of contact-type image sensor of getting rid of interference.

Background technology:

Fig. 1 is the sectional drawing of existing contact-type image sensor, 1 is illuminating source among the figure, the 5th, lens, the 4th, the photographic department (photosensitive integrated circuit) of receiver lens 5 light that converges, the 3rd, the sensor base plate of the photosensitive integrated circuit 4 that lift-launch is arranged in a straight line, the 2nd, hold the framework of light source 1, lens 5, sensor base plate 3,6 are arranged on the light-passing board of the lift-launch original copy on the framework 2, and 7 is original copy.

In above-mentioned contact-type image sensor, the light that light source 1 sends, see through light-passing board 6, shine on the original copy 7 of outside, literal black region light on the original copy 7 is absorbed, and almost 100% be reflected at other white undercolor region light of original copy, these reverberation pass light-passing board 6 again, collected by lens 5, shine the photosensitive area of the photographic department 4 on the sensor base plate 3, photographic department 4 be by many photosensitive areas and can will shine the light of each photosensitive area carry out opto-electronic conversion, and the drive circuit of signal output formed, the light of reception converts telecommunications to after overdrive circuit output is outwards exported as image (literal) information, original copy constantly moves, and the image information of being put down in writing on it (literal) will be read continuously.

Have following problem in the above-mentioned contact-type image sensor: the light that light source sends is in shining the process of original copy, at first enter air by light source, enter light-passing board then, shine at last on the original copy, scattering and refraction can take place through different media in light in this process, after scattering and refraction, it is disorderly and unsystematic that light becomes, directivity is very poor, and we know that false proof reticulate pattern is different with the reading angular of normal literal or image information.So mixed and disorderly like this light not only provides normal text or the needed reading angular of image, also provide false proof reticulate pattern needed reading angular simultaneously.Therefore, contact-type image sensor originally is to get rid of the such interference of false proof reticulate pattern.

Summary of the invention:

Technical problem to be solved in the utility model is: overcome the disorderly and unsystematic of existing contact-type image sensor light, propose a kind of contact-type image sensor that can get rid of interference.

The utility model can reach by following measure:

A kind of contact-type image sensor, comprise sensor base plate, carry the photosensitive integrated circuit that is arranged in a straight line on the sensor base plate, be photographic department, be provided with lens above the photographic department on the sensor base plate, a side of lens is provided with light source, and the framework that can hold the sensor substrate, lens, light source, the top of framework is provided with the light-passing board that carries original copy, it is characterized in that being provided with light polarizing film between light source and the light-passing board, and light polarizing film generally sticks on the light-passing board inner surface.

The above-mentioned light polarizing film that is arranged on the light-passing board inner surface of the utility model, its light that allows certain angle by and enter light-passing board, the light of other direction is absorbed.

The utility model is owing to have light polarizing film on the inner surface of light-passing board, light polarizing film is on the position between light source and the light-passing board, so the light that penetrates from light source need just can enter light-passing board through after the light polarizing film, through after the light polarizing film, direction of light is fine, like this, the light that shines on the original copy also just has good directivity, the light that reads the needed special angle of false proof reticulate pattern just has been absorbed, and has so just got rid of interference, obtains needed image information.

Description of drawings:

Fig. 1 is the sectional drawing of existing contact-type image sensor.

Fig. 2 is the sectional schematic diagram of a kind of contact-type image sensor of the present utility model.

Mark among the figure: light source 1, framework 2, sensor base plate 3, photographic department 4, lens 5, light-passing board 6, original copy 7, light polarizing film 8

Embodiment:

Below in conjunction with accompanying drawing the utility model is further described:

Shown in Figure 2 as accompanying drawing, the 1st, illuminating source, the 5th, lens, the 4th, the photographic department of receiver lens 2 light that converges, it is photosensitive integrated circuit, the 3rd, carry the sensor base plate of the photosensitive integrated circuit be arranged in a straight line, the 2nd, hold the framework of light source 1, lens 5, sensor base plate 3,6 are arranged on the light-passing board of the lift-launch original copy on framework 2 tops.The structure of above-mentioned each part and the interconnected relationship between them are same as the prior art, and this does not give unnecessary details, and feature of the present utility model is to be provided with light polarizing film 8 at the light-passing board inner surface.

The light that the utility model light source 1 sends, in seeing through the process of light-passing board 6 directive original copys, at first pass through light polarizing film 8, because 8 of light polarizing film allow the light of special angle to pass through, the light of other angle can be absorbed, so have good direction consistency through the light after the light polarizing film, eliminated original rambling light.

The light that the utility model light source sends is by after the light polarizing film, just obtained the light of the angle of needs, such illumination is mapped on the original copy, literal black region light on the original copy is absorbed, and almost 100% be reflected at other white undercolor region light of original copy, these reverberation pass light-passing board 6 again and are collected by lens 5, shine the photosensitive area of the photographic department 4 on the sensor base plate 3.Photographic department 4 be by many photosensitive areas and can will shine the light of each photosensitive area carry out opto-electronic conversion, and the drive circuit of signal output is formed, the light of reception converts telecommunications to after overdrive circuit output is outwards exported as image (literal) information.Original copy constantly moves, and the image information of being put down in writing on it (literal) will be read continuously.And the light that reads the needed angle of false proof reticulate pattern can't pass through light polarizing film, also just can't read the information of false proof reticulate pattern naturally, has so just got rid of the interference of anti-fake mark, has improved print quality.

Claims

1, a kind of contact-type image sensor, comprise sensor base plate, carry the photographic department that is arranged in a straight line on the sensor base plate, be provided with lens above the photographic department on the sensor base plate, one side of lens is provided with light source, and the framework that can hold the sensor substrate, lens, light source, the top of framework is provided with the light-passing board that carries original copy, it is characterized in that being provided with light polarizing film between light source and the light-passing board.

2, a kind of contact-type image sensor according to claim 1 is characterized in that the light-passing board inner surface posts light polarizing film.