The basic principle of three-dimensional printing
Three-dimensional printing should first use a dual-lens stereo camera equivalent to the human eye to shoot two negatives. Stereo photography and printing into plates corresponding to the object images seen by the left and right eyes, respectively. Then stagger the printing at a certain angle. In order to see the image clearly, a thin transparent transparent plastic sheet, called cylindrical lens for short, must be added to the printed product. This cylindrical lens is very critical, and its concave-convex interval is 0.6mm. The uneven surface divides the image into countless pixels equidistantly. There are 120 uneven lines per inch, and there are 6 pixels under each line. These pixels respectively form overlapping object images staggered by a certain distance on the plane. This staggered distance forms a space with the help of cylindrical lenses, so that people can feel the depth between the front of the scene and the background, so that the image information obtains a three-dimensional sense.
Prerequisites for 3D printing
Stereo photography is a prerequisite for stereo printing. The methods of stereo photography are roughly divided into direct methods and indirect methods. The direct method refers to the method of shooting directly through the transparent cylindrical lens. Moving the lens within a certain field of view continuously shoots the subject, and the effect is better. The indirect rule is to take more than two photos from a pre-specified location, and then synthesize them correctly in a pitch. Considering the form of the printing plate, the printing with the Coro plate is the best, because it has no interference from the dots, but because the printing volume is limited, offset printing is generally used at present.
First, use a 300-line / inch screen to screen and make a positive image dichroic film. With the positive image dichroic film, when printing, in order to make the printing plate made of 4 dichroic films printed into a virtual image In order to misprint, the dislocation phase of the 4 dichroic films should not exceed 0.6mm. When attaching transparent cylindrical lenses to printed false printed products, in addition to maintaining the convex-concave interval of 0.6mm when the transparent cylindrical lenses are pressed, the thickness of the cylindrical lenses must also be limited, which is too thin for casting. Concavo-convex shape, too thick to damage the three-dimensional sense, generally 0.2 ~ 0.3mm is appropriate. [next]
3D printing technology overview
There are many types of three-dimensional printing. The process of ordinary three-dimensional printing mainly includes the following steps:
The principle of various three-dimensional printing processes will basically not be very different, but only to improve on individual process details, but the current three-dimensional printing technology can be divided into the following types according to the observation method:
Two-color three-dimensional printing, with complementary two-color printing, with two-color glasses to see the three-dimensional effect.
In ordinary three-dimensional printing, after processing the negative film of three-dimensional photography, the three-dimensional image can be seen according to the refraction of light through the cylindrical grating method.
Dynamic three-dimensional printing, which is an extension of three-dimensional printing technology. First of all, we must prepare a distinctive animation photo, which is 18 photos of the film in sequence to form a photo. Using this photo as the original, add a thin transparent plastic plate in front of the photosensitive sheet of the camera, and then place a 300 line / inch screen at an appropriate distance in front of this plastic plate. Everything is properly arranged, the reflected light of the photo passes through the screen and the plastic plate, and reaches the photosensitive film, that is, a chain-like photographic negative film decomposed by pixels is made. With this plate-making printing, you can make a dynamic Screen. You must also add a transparent cylindrical lens to the picture to achieve the purpose of direct viewing with the naked eye. Holographic three-dimensional printing is to process the laser holographic three-dimensional photographic film and mold it, and see the color and image through the interference of light.
Laser hologram printing technology, when taking pictures, laser light is diffused and irradiated onto the object by the convex mirror, and the light reflected from the object reaches the film surface. The reference beam, another beam of laser light that has nothing to do with the subject, is reflected by the mirror and also reaches the film surface. The overlapping of the two lasers produces thin lines called interference lines. Films with such fine lines are called holograms. Irradiating the hologram with laser can reproduce the image in the line. The production and reproduction of holographic pictures are collectively called holograms or holograms.
Three-dimensional three-dimensional printing is made by printing three-dimensional manuscripts processed by a computer, and the three-dimensional effect can be seen through staring.
The concave and convex embossing is processed on the surface of the printed paper or plastic to make it have a three-dimensional effect, which is convenient for direct viewing.
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