Violet laser light source does not refer to a specific wavelength laser generator, but refers to a laser generator with a wavelength between 395 and 410 nm. Violet laser light sources produced by different manufacturers have slightly different wavelengths, but roughly within the above range. There is not much deviation. The purple laser light source was not specifically developed for the printing industry. Its application field is mainly the home appliance industry. In the home appliance industry, this laser light source is also called blue laser.
The earliest application of the purple laser light source to the printing industry was Agfa. At the Drupa exhibition in 2000, the first computer-to-plate system using a purple laser diode as the light source was unveiled in front of the world. At that time, the power of the purple laser diode used in this CTP device was only 5mW, and the exposure could only use a higher speed Silver salt plate.
From 2000 to now, the development speed of violet laser light source is amazing. Since it was originally produced only by Nichia Chemical Industry Co., Ltd. and now it is blooming everywhere, the purple laser light source is no longer mysterious. In order to be able to more clearly grasp the latest progress of the current purple laser light source, the author combed the reports on the development of purple laser diodes in recent years:
year 2002
On February 18th, Nichia and Sony reached an agreement to cooperate in the development of blue-violet photodiodes for optical disc recording and playback. The cooperation started in June 2002, and by 2003, mass production capacity was formed. To speed up the cooperation process, the two companies reached an agreement at the same time so that both parties can share each other's production skills and patented technology. This is the first time that a well-known international multinational company has intervened in the development and production of a violet laser light source.
2007
In January, the British company Photonic Products took the lead in launching a 405nm violet laser diode module with an external size of 3.5 × 2mm, an output power of 25mW and a TTL modulation function, which produces a stable elliptical beam. This is the debut of the 405nm violet laser light source. , Popular with users. Due to its high signal-to-noise ratio and high energy density, the module has better accuracy and sensitivity, and is suitable for biological and biological analysis applications, such as flow cytometry and laser-induced fluorescence sensing to collect as many fluorescence signals as possible .
In March, Nichia announced the successful development of a 320mW high-power semiconductor violet laser diode. This kind of violet laser diode has a life span of more than 10,000 hours under the pulse working mode and the case temperature of 80 ℃.
In the same month, the University of California, Santa Barbara announced that a research team led by Shuji Nakamura has developed a new type of low-threshold current, non-polar purple laser diode. The power of this violet laser diode is not specifically disclosed, and its wavelength is 405 nm in the pulse execution state.
In May, another major crocodile in the field of international home appliances, Sharp Corporation of Japan, announced the mass production of purple laser diodes with model GH04020A4G. The wavelength of Sharp violet laser diode is 406mm, the maximum output capacity is 20mW, and the life span of 5mW continuous output is 10,000 hours. It is worth mentioning that the price of this violet laser light source is only 10,000 yen.
Shortly thereafter, Sony's wholly-owned subsidiary Sony Shiraishi Semiconductor announced that it will expand its violet laser diode monthly production capacity to 1.7 million, and put into production 240mW violet laser diodes in November of that year.
Year 2008
In September, Mitsubishi Chemical Corporation announced the commercialization of the gallium nitride substrate used in violet laser diodes.
In October, Sanyo Japan also announced a violet laser diode, the energy of this violet laser diode increased to 450mW.
According to the information retrieved from the website of the Japanese company, the output power of the NUV101E type purple laser diode (wavelength 400 ～ 410nm) provided by the Japanese company has reached an astonishing 6W, which has increased from the 5mW when it was just released. More than 1,000 times.
Perhaps our understanding of the purple laser diode is still superficial, and the data is not sufficiently detailed, and there may even be flaws and errors, but this is not important, because after all, the core problem we care about is not this light source itself, but it gives The impact of the printing industry.
In fact, as soon as the purple laser light source was first used in the printing industry, the author once asked the manufacturer: Since the wavelength of the purple laser is 400 ～ 410nm, why not use traditional offset printing plates for direct plate making? ? I have been engaged in PS version production for 9 years, and I have a certain understanding of the PS version production system. The 215 diazonaphthoquinone acid chloride photosensitive material used in the PS version has a photosensitive range of 280 to 450 nm, and its absorption peak appears precisely around 410 nm. In this sense, the birth of the purple laser diode seems to have opened a window for computer-to-plate directly using traditional plates.
But at the time, the answer the author could get was no, the violet laser computer-to-plate machine could only use the violet laser CTP plate specially developed for this kind of equipment. For this explanation, the reasonable explanation may be that the output power of the purple laser CTP device that was originally introduced is too small to support direct plate-making on traditional offset plates.
In addition, there may be another reason. For a long time, although the domestic production of PS version has been lively, but it is really going to the international market, more than 90% of the market share still belongs to the famous three giants. If these three giants are unwilling, it will be difficult for other companies to set off big waves. Using the traditional PS version for computer-to-plate directly encountered such embarrassment. For this technology, the performance of several major international plate material manufacturers is not only inactive, but even a bit contradictory. The author once interviewed the senior executives of several major plate manufacturers in some activities. Once asked the question of direct plate making of traditional plates, the other party's general reaction is that it is not a question that they will answer directly, but will Tell the author tirelessly: "We can provide a complete solution. The solution we provide can meet your needs. Accepting our solution is your best choice."
I also understand this reaction. In the previous article, the author has stated that if this purple laser CTP device is directly positioned on the direct platemaking using traditional offset printing plates, the expected profits of plate production enterprises will vanish. And this is obviously what the plate material production enterprises, especially the plate material production enterprises that can dominate the technological development direction in the international market, do not want to see. For enterprises, the investment in R & D is recovered through the profits obtained from product sales. If it can't be recovered, then the initial investment is equivalent to being floated. For an enterprise, any investment without return is a loss. This is definitely something that any enterprise is unwilling to happen, not to mention that the early R & D investment of products like plate materials is very high. Since it is developed, it must not be easily given up. From a business perspective, the profit margin of traditional plate materials has become very meager with the popularization of production technology and the rise of Chinese manufacturing companies. In comparison, whether it is a thermal CTP plate or a purple laser CTP plate, the price is much higher than the traditional plate, and the profit margin is higher. As General Manager Li Xianyong of Beijing Corey Sunshine Company puts it, "Digital plates are generally regarded as the last piece of cake in the field of offset printing". If anyone can cut a piece from this piece of cake, who would rush Eat the toots.
The author has always believed that China's plate material manufacturing companies should be the most supporters of traditional plate-making technology. The reason is very simple. In terms of plate production technology, Chinese companies have not invested as much manpower and material resources as foreign companies. In this case, it is better not to consider the "Laoshi" digital plates and concentrate on the sensitivity of traditional plates. The uniformity of the glue coating is further improved, and the photosensitive speed of the plate is further increased. If this can be achieved, the enterprise can fully enjoy the benefits brought by the direct plate making of the computer. Why should we run behind others butt? Domestic plate material and equipment manufacturers really seize this once-in-a-lifetime development opportunity, and strive to run ahead of others, so that the international computer direct plate-making market also has the Chinese voice.
At present, there are still relatively few companies in the world that produce traditional plate computer plate-making equipment, and there are only three of them. Among these three, the author is not optimistic about Bessin's technology. This technology uses traditional lamps instead of laser light sources, which is not in line with the trend of technological development. However, early this year, we saw that Besin had already begun to apply violet laser diodes to the new generation of CTcP devices it developed, and it is not known how to completely abandon traditional lamps in the future. The other two, including Lausanne in Switzerland and Corey in China, use violet laser diodes as the exposure light source, which should become the development direction of traditional plate computer direct plate-making technology.
For printing companies, the traditional plate computer direct plate-making technology used to make them love and hate too. They do n’t need companies to bear excessive plate costs, hate their one-time investment is too high, and maintenance costs are not low. Now, China's traditional plate computer direct plate-making equipment has come out, and the price threshold has been completely broken. Will printing companies choose cheap, easy-to-use technologies instead of quality, price-free products? The output power of the purple laser light source has reached 6W, which means that the plate-making speed may exceed the traditional plate-making machine. At this speed, can printing companies not be bothered?
At the China International All-India Exhibition 2008, when he communicated with General Manager Zhan Wenqing of Wangchang Company, his words were very enlightening. He believes that the production of traditional plate-making equipment is still too little. "One flower alone is not spring, a hundred flowers blooming in the spring." Mr. Zhan suggested that equipment manufacturers like Corey can be more open on the basis of having core technology and keeping the technology leading, even if some competition has developed It is also a good thing for opponents to come, because this can form a climate, and the popularity of technology can be promoted faster.
The purple laser light source is constantly being upgraded, and the traditional plate computer direct plate-making technology is becoming more and more practical. The author here again appeals to domestic manufacturers, go their own way, the traditional plate computer direct plate-making technology will be the right path for the development of China's offset plate-making.
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