There is a kind of photo that you can see immediately after shooting. Shake it with your hand? What's your name? What is the principle?

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One-time imaging photography is desirable, with the advantages of fast photography and saving silver salt, which is deeply loved by people. Because of its high imaging speed, it is also widely used in national defense, scientific research, medical treatment and news reporting.

The lens and shutter of a first-class imaging camera are no different from ordinary cameras. Its special working principle and the body of disposable imaging camera loaded with film are also different. In order to transfer and crush charges, there are a pair of stainless steel rollers on the fuselage, and the positive and negative film bases pass through the rollers.

The photosensitive material used for primary imaging consists of two substrates. The substrate of the first layer is a negative film, and its surface is coated with silver halide photosensitizer with high silver content and thin coating; The substrate of the second layer is a positive film, and the surface is coated with a coating composed of activated carbon, sulfide, rubber, etc. There is a plastic bag with only medicine slurry between the two substrates. The slurry is made of a mixture of developing fixing agent, silver halide solvent and rubber. After the exposure of the negative, the two bases are pressed by a pair of rollers at the same time, the plastic bag is crushed, and the slurry is evenly coated on the overlapping surface of the negative and the positive. A series of rapid reactions will occur between the positive film and the negative film. In the emulsion layer of the negative film, the silver halide in the photosensitive part is reduced to produce metallic silver, which is on the negative film; The unexposed silver halide is dissolved by the slurry, diffuses to the receiving layer of the positive film, contacts with the catalyst such as silver sulfide in the receiving layer, and is reduced to metallic silver, thus forming the positive image needed by people on the double-layer film base. This forms a photo.

At present, the imaging films without developing cameras on the market are all boxed, with 8 films in each box. When shooting, the film is packed in a box at the back of the fuselage. After shooting, pull out the leading paper so that the front and back sides overlap, and then pull out the film from the gap between a pair of rollers. After a few seconds, the positive film is removed from the negative film and coated with a layer of varnish to get a bright and smooth photo.