A high-resolution line array image reading device

Abstract

The invention discloses a high-resolution linear-array image reader which comprises a light source, a lens array, a plurality of sensor chips and light transmission plates, wherein the light source can irradiate manuscript; the lens array extends to the entire reading range in the perpendicular direction of the travel direction of the manuscript and can focus the light reflected by the manuscript; the sensor chips are arranged linearly and can receive the convergent light of the lens array; photosensitive pixels, which can convert light signals into electric signals, are arranged on the surface of each sensor chip in a linear array mode, and overlap on the substrate of the previous sensor chip; and each light transmission plate for regulating light at the clearance between the sensor chips is arranged at the clearance between the substrate and the lens. The invention is characterized in that the photosensitive pixels within a certain range of both ends of the sensor chip are arranged nonuniformly. The invention can eliminate image loss caused by the clearance between the sensor chips when reading a high-resolution image, thereby enhancing the image reading quality.

Description

technical field [0001] The invention relates to an image reading device, in particular to a high-resolution linear array image reading device. Background technique [0002] figure 1 It is a cross-sectional view of an existing line array image reading device. In the figure, 1 is a line lighting source that emits light and uniformly illuminates an original; Focusing lens array, 3 is a plurality of sensor chips arranged in a line for receiving the light collected by the lens array 2, 4 is a sensor substrate on which the above-mentioned sensor chips are mounted, and 6 is a housing for accommodating the light source 1, the lens array 2, and the sensor substrate 4. Frame 5 is a glass plate on which a document is placed on the frame 6, and 10 is a document. [0003] figure 2 It is a structural schematic diagram of a sensor substrate equipped with a sensor chip of an existing linear image reading device. A plurality of sensor chips 3 are arranged in a straight line on the substr...

AI Technical Summary

Problems solved by technology

[0007] In order to reduce the loss of image information caused by the sensor chip gap, a light-transmitting plate with a concave-convex structure is added between the lens and the sensor substrate in the patent of the publication number CN1678012A (the patent’s Figure 10 ), the optical signal at the chip gap is introduced into the photosensitive pixels close to the end of the chip. Although this structure utilizes the optical signal at the chip gap, it does not specifically restore these optical signals to the image information, but instead superimposes these signals onto nearby light-sensitive pixels

For the read image, the signal at the sensor chip gap is superimposed on the photosensitive pixel of the attachment, although the loss of image information is reduced, but this method will cause distortion of the superimposed image, and it cannot achieve true The purpose of restoring the image

[0008] The above-mentioned line array image reading device has the following problems: due to the gaps between the sensor chips when assembled, the image information between the chip gaps will be lost or the adjacent images will be distorted when the image is read, especially for high-resolution sensors. For an image reading device, the same gap between chips corresponds to a larger number of photosensitive pixels, resulting in more serious distortion.

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