Is the laser trademark radioactive?

No laser trademark is actually a laser anti-counterfeiting trademark. Just look at the following principle, which has nothing to do with real laser lines.

Laser anti-counterfeiting technology

Laser anti-counterfeiting technology includes three aspects: laser holographic image anti-counterfeiting mark, encrypted laser holographic image anti-counterfeiting mark and laser holographic lithography anti-counterfeiting technology.

The first generation laser anti-counterfeiting technology

The first generation of laser anti-counterfeiting technology is laser molded holographic image anti-counterfeiting logo.

Holography was discovered by American scientist M.J. Buerger when he photographed the atomic structure of crystal with X-rays, and together with dennis gabor, he established the holographic theory: using the principle of double-beam interference, object light and another beam (reference beam) which is coherent with object light can produce interference patterns to "merge" the phases, so that the lower phase and amplitude can be recorded at the same time with the photosensitive film. However, holography is based on the principle of interference and must be recorded with high-density (resolution) photographic film. Due to the poor monochromaticity and coherence of ordinary light sources, the development of holographic technology is slow, and it is difficult to shoot decent holograms. It was not until the appearance of laser in the early 1960s that its characteristics of high brightness, high monochromaticity and high coherence quickly promoted the development of holographic technology. A variety of holograms have been produced, and the holographic theory has been well verified. However, due to the special requirements of shooting and reproduction, it has been almost confined to the laboratory since its birth.

At the end of 1970s, it was found that holographic pictures had a surface structure including three-dimensional information (that is, criss-crossing interference fringes), which could be transferred to high-density photographic negatives and other materials. 1980, American scientists transferred the holographic surface structure to polyester film by using relief holographic technology, thus successfully printing the world's first relief holographic picture. This kind of laser holographic picture, also known as rainbow holographic picture, is made on plastic film by laser plate making, which produces colorful diffraction effect and makes the picture have two-dimensional and three-dimensional sense of space. Under ordinary light, hidden images and information will reappear. When light shines from a certain angle, a new image will appear. This kind of relief holographic picture can be copied in large quantities as quickly as printing, with low cost, and can be used in combination with various printed matter. At this point, holography has taken a decisive step towards social application.

At that time, the production technology of this molded holographic picture was very advanced, and only a few people mastered it, so it was used as an anti-counterfeiting mark. Its anti-counterfeiting principle is:

1. In the whole process of laser holographic picture shooting, if a condition is different (such as the condition of shooting rainbow hologram), the effect of holographic recognition will be different.

2. The holographic information of this holographic image can't be captured by ordinary photography, so it is difficult to copy the holographic pattern.

Johnny Walke Whishy (a whisky) was the first person to use holographic pictures as anti-counterfeiting marks. When it was applied in Thailand, it was said that the sales volume increased by about 45%.

Laser-molded holographic anti-counterfeiting technology was introduced to China in the late 1980s and early 1990s, especially during the period from 1990 to 1994. Hundreds of production lines were introduced throughout the country, accounting for more than half of the world's manufacturers at that time. At the initial stage of introduction, this anti-counterfeiting technology did play a certain anti-counterfeiting role, but with the passage of time, laser holographic image production technology spread rapidly, and now it has been broken by counterfeiters from all aspects, almost completely losing its anti-counterfeiting ability.

Technical review

There are the following inherent defects in the production of laser anti-counterfeiting marks:

1. Only rely on the confidentiality and control of production technology to prevent counterfeiting.

2. It belongs to a simple observation anti-counterfeiting technology, and its observation point is mainly to see whether it is a holographic image, and secondly to see whether the pattern conforms to the published pattern, but ordinary consumers can distinguish two different versions of the holographic logo by careful comparison.

3. There is no technical method to prevent the anti-counterfeiting mark itself from being reused.

There is no technical method to prevent the packaging with anti-counterfeiting mark from being reused.

5. There is no technical method to prevent counterfeiters from obtaining anti-counterfeiting marks by means of buying and bribing.

Second, the improved laser holographic image anti-counterfeiting logo

Because the first generation of laser holographic anti-counterfeiting logo has completely lost its anti-counterfeiting function, people have to start to improve it. There are three main improvement methods: the first is to improve the holographic image by computer technology, the second is to develop a transparent laser holographic image anti-counterfeiting logo, and the third is to reflect the laser holographic image anti-counterfeiting logo.

2. 1 improvement of computer image processing technology

Computer image processing technology for improving laser holographic images has gone through two stages of development. The first stage is computer synthetic holography. This technology is to optically image a series of ordinary two-dimensional images, process them according to the principle of holographic images, and record them on a holographic recording material to form a computer pixel holographic image. When observing this kind of pixel holographic image, different three-dimensional images can be seen from different perspectives, and their graphics and colors have extremely flexible and dynamic effects, and are not limited by the direction of reproduced light. The second stage is computer-controlled direct exposure technology, which is different from ordinary holographic imaging. This technology does not need to shoot objects, and the required patterns are completely generated by computers. By computer controlling two coherent beams to generate all patterns point by point, the angle between the two beams can be changed for different points, thus making a three-dimensional hologram with special effects.

2.2 Transparent laser holographic image anti-counterfeiting technology

Ordinary laser holographic images are molded with aluminized polyester film (or molded with polyester film first and then aluminized). The function of aluminized film is to increase the intensity of reflected light and make the copied image brighter. The illumination light and observation direction are on the observer's side, so the laser rainbow embossed hologram is opaque. The improvement of transparent laser holographic image is actually to cancel the aluminum plating layer, and the holographic image is directly molded on the transparent polyester film. 1996, the Ministry of Public Security of China decided to apply transparent laser rainbow relief hologram to resident identity cards. The ID card is completely covered and sealed by transparent film. When you look at the front of the card under the light, you can not only see the documents clearly, but also see the two-dimensional and three-dimensional rainbow holographic images (the Chinese and English words of the Great Wall and China) copied on the transparent film.

2.3 reflection laser holographic image anti-counterfeiting technology

Reflective hologram is to shoot incident laser light on a transparent holographic emulsion medium, with part of the light as reference light, and the other part of the light shining on the object through the medium, and then the object scatters back to the medium as object light. The object light and the reference light interfere with each other, resulting in multi-layer interference fringes in the medium. When the negative film of the medium is processed, multi-layer semi-transparent reflective surfaces are generated in the medium (for example, a latex layer with a thickness of 6 microns can have more than 20 reflective surfaces). In the process of hologram replication, the hologram is illuminated by a white light source, and the multi-layer translucent reflecting surface generated in the medium reflects the light back, and the virtual image of the original object can be seen against the reflected light, so it is called a reflection hologram.

Technical review

These improvements in laser anti-counterfeiting technology have not and cannot extend the life cycle of laser holographic image anti-counterfeiting technology, because these improvements only increase the difficulty of image manufacturing to varying degrees, and even do not improve the inherent shortcomings of laser holographic image anti-counterfeiting, and the original problems still exist.

Thirdly, encryption holographic image anti-counterfeiting technology.

Encrypted holographic images are encrypted by optical image coding encryption technologies such as random phase coding image encryption, moire coding image encryption and laser speckle image encryption, so as to obtain encrypted images that are invisible or become some speckle. Among them, the image encrypted by random phase coding is invisible, and the original image can only be displayed by special photoelectric decoder, which is not suitable for general commodities. At present, it is mainly used for anti-counterfeiting of various cards. Images encrypted by moire code and laser speckle can only be displayed when superimposed with decoded grating or decoded speckle, which can be used for general commodity anti-counterfeiting.

The anti-counterfeiting principle of encrypted images is that encrypted images are invisible or noisy, and it is difficult to decipher without keys, so they have certain anti-counterfeiting functions.

Technical review

In fact, these technologies are originally an image encryption technology, and they really don't want to be used for anti-counterfeiting. First of all, although images encrypted by random phase coding need special instruments to display, are they hard to have in today's high-tech and international counterfeiting? How difficult is it to decipher? As for the images encrypted by moire code and laser speckle, it is easier to forge, because consumers get not only the anti-counterfeiting logo encrypted by the image, but also the decoding grating or decoding speckle used to verify the authenticity. Since then, image encryption has not played any role in anti-counterfeiting. The anti-counterfeiting of this anti-counterfeiting logo depends entirely on the difficulty of mastering the manufacturing technology of encrypted images, but it is not difficult to master this technology.

4. Laser holographic lithography anti-counterfeiting technology

Laser holographic lithography anti-counterfeiting technology is also called laser coding technology, also called laser "recording" technology. Because the laser encoder is expensive and not widely used, it is only used in mass production or where other printing methods cannot be realized. Because of this, it has played the role of anti-counterfeiting packaging. Laser coding sealing technology is a good container anti-counterfeiting technology. After the product is filled, sealed and capped, laser printing is carried out at the joint between the lid and the container, so that the upper part of the font is printed on the lid and the lower part is printed on the container. The anti-counterfeiting function of this technology lies in:

(1) The packaging container cannot be reused. The new lid matches the old container, and the handwriting is difficult to align.

(2) Laser is expensive, so it is coded and printed on the production line. It is difficult for ordinary counterfeiters to invest heavily in such equipment.

(3) Manufacturers can change printing templates at will and use different templates on different dates. Only a few people know the details of the change, and it is difficult for outsiders to crack it.

From the perspective of anti-counterfeiting effect, laser coding technology is even better than laser holographic image technology. The laser holographic logo is printed by a printing factory, and the manufacturer using the logo cannot guarantee that the master will not flow out or be illegally copied during the printing process. For counterfeiters, laser holographic marks can be purchased directly in bulk, without equipment investment or mastering technology. While using laser coding technology to prevent counterfeiting, the first problem that counterfeiters encounter is the expensive equipment investment. Laser encoders are expensive and must be used online. In addition, the change of font template is secret, which makes it difficult for scattered small and medium-sized factories to forge. For these reasons, the life of the package using laser coding technology is longer than that using laser holography technology.

Technical review

Although the anti-counterfeiting effect of laser holographic lithography is better than some anti-counterfeiting marks, it also has the following disadvantages:

1. Because of the high cost of laser encoders, it is difficult for small and medium-sized enterprises to adopt them.

2. Relying on high investment barriers to prevent counterfeiting, once counterfeiters have this equipment, its anti-counterfeiting function will be invalid immediately.

General technical review:

Laser holographic anti-counterfeiting technology is a modern laser application technology achievement that has attracted wide attention at home and abroad in recent years. With its profound holographic imaging principle and colorful flash effect, it is favored and loved by consumers. Laser holographic anti-counterfeiting marks can be widely used in famous trademarks, securities, security cards, luxury handicrafts and so on in light industry, medicine, food, cosmetics, electronics and other industries. Compared with general printed trademarks, it has unique advantages and charm. However, there are many domestic manufacturers and their management is extremely chaotic, which greatly affects their credibility in the eyes of the public. This technology is suitable to be combined with other anti-counterfeiting technologies, such as laser holographic comprehensive anti-counterfeiting, laser coding composite, laser ink composite, packaging laser composite and so on.