Working Principle of Laser Galvanometer You Should Know

Since 1995, the field of laser marking has experienced the era of large format, rotating mirror and vibrating mirror, and the control mode has also completed a series of evolution from software direct control to upper and lower computer control to real-time processing and time-sharing reuse.

Nowadays, the emergence and development of semiconductor lasers, fiber lasers and even ultraviolet lasers pose new challenges to optical process control.

The galvanometer laser marking head (galvanometer scanning system) is the latest product.

In 1998, the large-scale application of galvanometer scanning systems in China began to come.

The so-called galvanometer can also be called ammeter. Its design idea completely follows the design method of the ammeter.

The lens replaces the needle, and the signal of the probe is replaced by the computer-controlled – 5V-5V or – 10V – + 10V DC signal to complete the predetermined action.

Like the rotating mirror scanning system, this typical control system adopts a pair of turn-back mirrors.

The difference is that the stepping motor driving this set of lenses is replaced by the servo motor. In this set of control system, the use of position sensor and the design idea of negative feedback loop further ensure the accuracy of the system, and the scanning speed and repeated positioning accuracy of the whole system reach a new level.

Galvanometer scanning marking

Galvanometer scanning marking head is mainly composed of galvanometer scanning marking head, which is mainly composed of XY scanning mirror, field mirror, galvanometer and computer-controlled marking software.

Select corresponding optical components according to different laser wavelengths.

Relevant options also include laser beam expander, laser, etc.

Its working principle is that the laser beam is incident on two mirrors (scanning mirrors), and the reflection angle of the mirrors is controlled by the computer.

The two mirrors can scan along the X and Y axes respectively, so as to achieve the deflection of the laser beam and make the laser focus with certain power density move on the marking material according to the required requirements, so as to leave permanent marks on the material surface.

The focused spot can be circular or rectangular.

In the galvanometer scanning system, vector graphics and text can be used.

This method uses the graphics processing method of the graphics software in the computer.

It has the characteristics of high drawing efficiency, good graphics accuracy and no distortion, which greatly improves the quality and speed of laser marking.

At the same time, the galvanometer marking can also adopt the dot matrix marking method, which is very suitable for online marking.

According to the production lines with different speeds, one scanning galvanometer or two scanning galvanometers can be used.

Compared with the array marking mentioned above, it can mark more dot matrix information and has greater advantages for marking Chinese characters.

Galvanometer scanning marking has become a mainstream product because of its wide application range, vector marking and dot matrix marking, adjustable marking range, fast response speed, high marking speed (marking hundreds of characters per second), high marking quality, good optical path sealing performance and strong adaptability to the environment.

It is considered to represent the development direction of laser marking in the future and has broad application prospects.

Laser marking head

The double marking head (double headed marking head, double headed) is composed of two scanning heads.

After one laser beam enters the marking head, it is divided into two laser beams through optical combination.

The special double headed marking software controls the double headed work respectively.

Its marking efficiency is twice that of the single head, and the marking area is twice that of the single head.

It is especially suitable for places requiring fast and large-area marking.

The technical parameters of the double header are the same as those of the above single header, but the marking area is twice that of the single header.

For example, the marking area of the single header is 100x100mm, and the marking area of the corresponding double header is 200x100mm.

Optical elements

We precisely optimize and debug all optical elements to ensure the best focusing quality and stable process parameters.

Our optical products include compact design objective lens, including adapter of the standard objective lens, and optical elements of various wavelengths, power density, focal length and field of view.

Digital laser marking head

Compared with the traditional analog marking head, digital marking head has the remarkable characteristics of small volume, fast scanning speed and strong anti-interference ability.

It is mainly used in optical fiber laser marking machine, end pump solid laser marking machine and flying laser marking machine.

Digital header features

1. Compared with the traditional on-line ink-jet method, laser on-line marking has the advantages of faster speed (up to 100 M / min), higher efficiency, remarkable anti-counterfeiting effect, meeting European environmental protection standards and extremely low operation cost.

2. The flight marking head can cooperate with various lasers to make a flight laser marking machine.

3. The utility model has the advantages of simple operation, wide application fields and is suitable for marking of various materials.

Application industry

The laser flight marking machine manufactured by the flight marking head can be widely used in the production of medicine, personal care products, tobacco, food and beverage packaging, alcohol, dairy products, clothing accessories, leather, electronic components, chemical building materials products and other fields, as well as the marking of graphics and words such as effective date, batch number, shift, manufacturer name and logo.

It is suitable for online marking of most materials, such as paper packaging, leather cloth, plexiglass, resin plastic materials, bamboo and wood products, coated metal, PCB board, etc.

Typical application

Drilling, cutting and welding, laser deep engraving, rapid prototyping, rapid processing, microstructure, 3D workpiece processing.

Working Principle

During the scanning process of the laser galvanometer, the divergent lens in the device is driven by a motor relative to the focusing lens to realize dynamic and accurate positioning on the optical axis.

This process changes the total focal length of the system and works synchronously with the scanning deflection lens, so the two-dimensional scanning can be expanded into a three-dimensional scanning system.

The device can replace the expensive flat field objective lens in two-dimensional scanning applications, and can also realize three-dimensional beam deflection scanning system.

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