A laser emitting device of a laser barcode scanner and its debugging method

Abstract

The invention discloses a laser emitting device of a laser barcode scanner and a debugging method thereof. The laser emitting body includes a base, a through hole is opened in the middle of the base, threads are arranged on the inner wall of the through hole, and a thread is provided with a corresponding external thread and one end sleeve The connecting sleeve with the laser head is screwed, and the other end of the connecting sleeve is screwed to an upper cover with a central hole in the middle. The connecting sleeve between the laser head and the upper cover is sequentially equipped with a spring, a lens and a light blocking sheet. There is a light-transmitting hole on the light sheet, and the laser is emitted through the light-transmitting hole of the baffle and the center hole of the upper cover. By rotating the upper cover, the distance between the lens and the laser head can be adjusted, thereby adjusting the focusing position of the light point (the size of the spot) size). The laser emitting device of the present invention can easily adjust the size of the light spot, ensures the concentricity of the laser emitting light path, and can well dissipate heat to the laser head.

Description

technical field [0001] The invention relates to the structure and debugging method of a laser emitting device of a laser bar code scanner. Background technique [0002] The laser emitting device on the laser barcode scanner is the light source of the entire system and an extremely important part of the entire optical system. As we all know, the laser emitted by the laser emitting diode is random, and most of them are divergent beams. What you want to get is a certain area of ​​light spot. The size of this light spot needs to be able to change with the use of the site. High-density barcodes need a small light spot, and low-density barcodes need a large light spot. The lens in this component can realize Converge the scattered laser beams, according to the convex lens imaging formula, adjust the distance between the lens and the light source to get spots of different sizes. This emitting device is developed around this principle. The previous technology is described as follows...

AI Technical Summary

Problems solved by technology

This adjustment method is extremely inconvenient. First, because the position of the object distance is uncontrollable, I don’t know whether it is near focus or far focus.

Second, if you use too much force, the lens cover will be screwed out, and the components on it will need to be reinstalled

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