Light gathering device for image scanning assembly

Abstract

The present invention provides a light-collecting device capable of gathering light source and guiding it onto scanned area. Said light-collecting device is made up by combining circular and elliptical arc reflecting surfaces, on these reflecting surfaces the light-reflecting sheets can be stuck or light-reflecting material can be plated so as to improve light intensity and light uniformity of scanned area. When the light is emitted from light source, the light can be collected and guided onto the scanned area, then can be imaged on the photosensitive component CCD or CMQS by means of scanned area.

Description

technical field [0001] The invention refers to a light collecting device of an image scanning component, especially a light collecting device that can effectively increase the light flux incident on the scanning surface of the image scanning component. Background technique [0002] The operating principle of the image scanning component used in the image scanner (scanner) or multi-functional business machine (MFP) is to irradiate the light emitted by the light source on the object to be scanned, and then concentrate the light on the charge-coupled device (CCD) through the lens CCD, charge coupled device) or CMOS (complementary metal oxide semiconductor complementary metal oxide semiconductor) photosensitive element, and then convert the light signal into an electrical signal to generate digital pixel (pixel) data; and general light sources can It is a light-emitting diode (LED), fluorescent tube, cold cathode tube (CCFL) or a special tube, such as a xenon tube. [0003] Gen...

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Problems solved by technology

[0011] However, this kind of improvement is due to the coating of the total reflection material 61 and the setting of the auxiliary light source 63, so the technical cost is also quite high. In addition, the light is reflected back and forth inside the light emitting tube 60, which will cause the tube wall to absorb light energy. As a result, the temperature of the light-emitting tube 60 rises, causing the temperature of the components to rise and deform, thereby affecting the imaging quality of the photosensitive element; in addition, the uniformity of the light emitted by the slit 62 cannot be effectively controlled, so this light collecting device is used for scanning The image quality obtained when the

[0012] It can be seen from the descriptions in the previous paragraphs that only a small part of the light can enter the scanning area in the light collecting device of the light source of the general image scanning component at present, and it is impossible to effectively use the energy of light to improve the brightness of the scanning area, while other technologies As disclosed in US2004 / 0080796A1 (light gathering apparatus of scanner) and TW563339 (scanner with self-gathering light source components), not only the manufacturing cost is high, but the quality of the light source cannot fully meet the high quality Scanning requirements, so these technologies are still difficult to apply to mass products

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