Light projector for scanning module

Abstract

The invention relates to a light projector for a scanning module, which comprises a substrate, a plurality of light-emitting diodes and a diffuser plate, wherein the light-emitting diodes are positioned on the substrate and are used for generating a plurality of incident rays; the diffuser plate is positioned on the side edge of the substrate and comprises a first plane, two end faces and a second plane; the first plane is used for receiving the plurality of incident rays; the two end faces are connected to both ends of the first plane in a direction of a horizontal axis; both ends of the second plane are connected to the two end faces respectively to diffuse the plurality of incident rays to scanning files; the second plane comprises a plurality of second horizontal concave parts for diffusing the plurality of incident rays and a plurality of second horizontal convex parts for aggregating the plurality of incident rays; and the plurality of second horizontal convex parts and the plurality of second horizontal concave parts are arranged in a staggered mode in the direction of the horizontal axis, so that the plurality of incident rays are diffused to the scanning files uniformly.

Description

technical field [0001] The invention relates to a light source projection device, in particular to a light source projection device for a scanning module. Background technique [0002] With the advancement of technology, optical scanners have become increasingly popular computer peripheral devices. Optical scanners capture images mainly by using a light-emitting device to irradiate light onto the document to be scanned. After the light is reflected by the document to be scanned, the light is guided to the photosensitive component by the lens group, and the photosensitive component can detect different areas on the document. Reflect light of different intensities, and convert the reflected light waves into digital data, and then use scanning software to read in the data and reassemble it into computer image files. [0003] see figure 1 and figure 2 As shown, the ideal light-emitting device should have a uniform brightness distribution, but because most of the current scan...

AI Technical Summary

Problems solved by technology

However, this method cannot improve the signal / noise ratio. After the brightness at both ends is compensated and amplified by the firmware (F / W), the noise will also be amplified, which will still cause image distortion.

[0005] In addition to the above-mentioned way of firmware (F / W) compensation to make the brightness uniform to improve the image brightness quality, the scanning module can also be uniformed through the foggy plane diffuser Light, but the intensity of the light will be greatly reduced after passing through the foggy flat diffuser, making the image brightness quality poor

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