Commercialization and application of the hottest r

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Commercialization and application of reflection hologram

in recent years, rainbow molded hologram anti-counterfeiting signs are widely used in China, and their characteristics have been familiar to people. With the development of holographic anti-counterfeiting technology, another kind of hologram anti-counterfeiting logo - reflection hologram anti-counterfeiting logo has also quietly entered the market. Several companies in Taiwan Province and the United States have successively displayed and launched this kind of reflection hologram anti-counterfeiting logo made of photopolymer media in China, which is refreshing. At present, this anti-counterfeiting logo has been applied to imported cameras in 1996, the promotion project of the National Ninth Five Year spark plan in 1998, tickets for the 1998 International sanda competition, etc., and has achieved great success, making people realize once again the artistic charm and anti-counterfeiting strength of the application of laser holographic technology to anti-counterfeiting

what is a reflection hologram

Figure 1 (omitted) shows the recording process of the reflection hologram. When the incident laser shines on the transparent medium, part of the light is used as the reference light, and the other part of the light illuminates the object through the medium, and then the object scatters back to the medium, generating multi-layer interference fringe surfaces inside the medium. After the medium negative is processed, multi-layer transparent reflection surfaces are generated inside the medium (for example, there can be more than 20 reflection surfaces in the 6 micron thick latex layer). Figure 2 (omitted) shows the reconstruction process of the reflection hologram. At this time, the subject no longer exists, but when the hologram is illuminated with a white light point light source, the virtual image of the original object can be seen against the reflected light, so it is called a reflection hologram

application of reflection hologram

the image formed by the above reflection hologram is monochromatic and does not show the change of rainbow. Three dimensional imaging can have great depth and angle of view. Because the interference fringe surface generated by it goes deep into the medium rather than concentrated on the surface, it cannot be copied by molding. This kind of early application in cultural relics display, treasure display, souvenirs, decorations, holographic components and other fields, the medium used is silver salt, dichromate gelatin and so on. The application of reflection hologram in anti-counterfeiting identification is a recent thing. The medium used is photopolymer, which can be processed in real time, which is convenient for organizing automatic mass optical copies

commercial true color three-dimensional holograms come out

Dai Nippon Printing Co., Ltd. (DNP) recently exclusively launched a commercial true color three-dimensional photopolymer hologram film that can be copied in batches, which is expected to be applied in true color three-dimensional photography, publishing and printing, commodity promotion, packaging and decoration, security and anti-counterfeiting, souvenir making, etc

the company has successfully produced a batch of true color three-dimensional holograms, including 3000 "pocket monster" holograms for gift card production; 12000 "Astro Boy" holograms for promotional/commemorative card making; 5000 true color three-dimensional holograms without pits or protrusions on the surface are used in the field of trade; In addition, they also made "parrots in the jungle" true color three-dimensional holograms for the cover of "market place" magazine (8th Edition) published all over the world. These true color three-dimensional holograms have bright colors, high brightness of reconstructed images and large field of view, which have attracted the attention of the international holographic community and are considered to be a new breakthrough in commercial true color three-dimensional holographic technology

the recording material used in the commercial true color three-dimensional photopolymer hologram launched by DNP company in Japan, which can be copied in batches, is a new type of HRF full-color photopolymer holographic recording material recently launched by DuPont company in the United States. Its characteristics are that it has a wide range of sensitivity and refractive index changes to various visible light waves, and can be made into holograms with high brightness of reconstructed images and large field of view

different holographic recording materials have different characteristics:

1. Silver salt emulsion holographic medium has high sensitivity, but the refractive index change range is small

2. Dichromate gelatin holographic medium has a wide range of refractive index, but its sensitivity is low

3. Photopolymer emulsion holographic medium has high sensitivity and a large range of refractive index change, which is suitable for making holograms with high brightness and large field of view of reconstructed images. In addition, this medium can be processed in real time by dry processing (only UV irradiation and heating, getting rid of the traditional wet processing method). Therefore, photopolymer latex holographic medium is particularly suitable for making holograms, which are currently the largest R & D base in northern Europe, and then making large quantities of contact copies

DuPont polymer emulsion is still fine? 5 microns, generally coated on 0.002 inch thick Mylar polyester base film, and then coated on the latex surface with 0.00092 inch thick Mylar polyester film

Japanese DNP company introduced their production steps:

1. Design, depending on the needs of customers, the data of the last test will be mixed with the data of this test

2. Model making, elaborate making and color matching of three-dimensional objects or two-dimensional planes

3. Master production

4. Copy and expose on a special machine

5. Processing, the hologram with stable and bright reconstructed image is formed by heating and ultraviolet irradiation, and DNP company adopts DuPont oven and laminating machine

6. After processing, carry out gluing, die cutting and other steps according to the needs of customers

dnp's output continues to increase, and multiple volumes of holograms can be made every day, with each volume 1 foot wide and 500 feet long. The price of hologram is 2 inches × The area of 2 inches is about 70 yen (about 0.5 US dollars)

Hans bjelkhangen, an American hologram expert, believes: "The new full-color photopolymer holographic recording material recently introduced by DuPont is especially suitable for true color three-dimensional holography. Although its sensitivity is slightly lower than that of silver salt emulsion holographic medium, it can be processed in real time by dry processing method, so it is particularly suitable for large-scale contact copying after silver salt master is made. During recording, the film is attached to the glass plate with matching solution (be careful not to make bubbles or dust on the glass plate). In order to achieve mass production, it is necessary to use a special machine to copy. The RGB (red, green and blue) trichromatic ratio can be taken as 4:1:2. Three lasers can be used to scan at the same time. The exposure intensity can be selected as 10 mJ per square centimeter. Therefore, the laser scanning cannot send the oil from the high-pressure oil pump to the experimental work cylinder, so that the pressure is not traced. After the exposure, it needs to be exposed by strong white light or ultraviolet light. DuPont proposes that the exposure intensity can be 100 mj per square centimeter, and the wavelength can be 350-380 nm. After that, the hologram will be heated in an oven at 120 ℃ for 2 hours to enhance the brightness of the reconstructed image

DNP claims that the lasers they use are: krypton ion lasers for red light; Argon ion laser, diode pumped solid-state laser and dye laser for green light; Argon ion laser for blue light

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