Holography is a special and very popular process that can take a three-dimensional effect. The laser light is diffused onto the object through the convex lens, and the light reflected from the object reaches the surface of the film, and the other light that is independent of the object, that is, the reference light is reflected by the mirror and reaches the film surface. When the two parts of the laser overlap, a thin line called an interference line pattern is produced. When magnified by a microscope, it can be seen that a picture of hundreds of thin lines is recorded at a position of 1 mm wide. Films with such thin lines are called holograms.
Holographic photography, which is often said, refers to a method of expressing a stereoscopic image using interference lines. Holograms are divided into several types, such as multiplex type and rainbow type.
The multiplex type is a stereoscopic image seen in a cylindrical transparencies, and the stereoscopic image can be seen from any angle, and can be said to be a true three-dimensional image, and the image therein can also exhibit an active feature. The rainbow type is viewed under white light, and you can see the rainbow-colored image, so you get this name.
By embossing, mass production can be carried out on a film or a transfer foil, and if it is processed on a transfer foil, it is difficult to forge by means of copying.
In view of this, holograms are often used to seal the placards, credit cards, or tickets used for sports conferences and concerts, etc., and can also be used as seals on the back.缄 Application.
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