Bar code recognition engine collimation structure and cross image diffraction condensing lens

Abstract

The invention relates to a bar code recognition engine collimation structure and a cross image diffraction condensing lens. The cross image diffraction condensing lens comprises a diffraction part anda condensing part; one side of the diffraction part is provided with a quadrate light emitting region; a diagonal line of the light emitting region divides the light emitting region into a first diffraction region and a second diffraction region; the first diffraction region is provided with a first groove and a first bulge which are alternately arranged along a first direction; the first grooveand the first bulge extend to a boundary line of the first diffraction region and the second diffraction region along a second direction; the second diffraction region is provided with a second grooveand a second bulge which are alternately arranged along the second direction; the second groove and the second bulge extend to a boundary line of the first diffraction region and the second diffraction region along the first direction; the first groove and the second bulge are intersected at the boundary line of the first diffraction region and the second diffraction region; the second groove andthe first bulge are intersected at the boundary line of the first diffraction region and the second diffraction region; the condensing part is disposed at one side, facing away from the first diffraction region and the second diffraction region, of the diffraction part; and after being condensed, a light ray is transmitted and emitted to present a cross image.

Description

technical field [0001] The invention relates to the field of barcode reading, and more specifically, relates to a barcode reading engine aiming structure and a cross image diffraction condensing lens. Background technique [0002] The aiming unit in the related art is an important component of the barcode reading engine. The pattern projected on the surface of the object is used to guide the user to aim at the device so that the barcode is within the field of view of the barcode reading engine. [0003] In the existing technology, the commonly used aiming patterns are one-shaped, dot-shaped, and cross-shaped; the realization of the one-shaped pattern is relatively simple, and it can be realized only by designing a cylindrical mirror. The one-shaped aiming pattern is generally only suitable for reading one The one-dimensional barcode scene with fonts, and it is easy to interfere with the rectangular lighting light. [0004] The dot-shaped pattern generally uses a concentrati...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the commonly used aiming patterns are one-shaped, dot-shaped, and cross-shaped; the realization of the one-shaped pattern is relatively simple, and it can be realized only by designing a cylindrical mirror. The one-shaped aiming pattern is generally only suitable for reading one The one-dimensional barcode scene of the font, and it is easy to interfere with the rectangular lighting light

[0004] The dot pattern generally uses a concentrating lens, which will cause an overly bright spot in the center of the barcode. When the chip is exposed, if the aiming time interval is too short, it will cause light pollution and affect the reading of the barcode.

[0005] The cross-shaped aiming pattern requires a complex lens structure, using the principle of optical refraction to image, designing and calculating the slope of each lens to obtain an irregular lens, and the manufacturing process is cumbersome

[0006] For this reason, the technical problem to be solved by the present invention lies in the design of the aiming lens of the barcode reading module in the prior art, and the manufacturing process is complicated, thus causing the problems of complicated design of the aiming structure and complicated manufacturing process

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