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Whether on a camera, an imagesetter, or a scanner, when exposed to the correct amount of exposure, some desired image is always formed on the photosensitive sheet. Because it is not easily noticeable by human eyes, this image is called a latent image.
How is a latent image formed? In the production process of the photosensitive sheet, in addition to the halogen-silver crystals, the sensitized emulsion is evenly distributed with silver atoms and silver sulfide molecules, which form many photosensitive centers on the surface of the photosensitive sheet.
Exposure, the light energy acts on the halogen silver (AgX) crystal, halogen halide (X Ì„) in the silver will lose one electron from the halogen atom (X), as in Figure B, the reaction formula is as follows:
The generated free electrons form electrons that move in the crystal. When they meet the photosensitive center, they are attracted by the center, causing the center to bear a negative charge. When it encounters a negative electric field, it concentrates on the photosensitive center. Is neutralized into a silver atom, just like:
When the exposure amount of the photosensitive sheet reaches a certain level, the photosensitive center expands into a developing center due to the increase of silver, which is a basis of the latent image, so the halogen element is generated and is absorbed by the surrounding colloid.
The main process of the photosensitive sheet in the manufacturing process is as follows: establishing a latent image on a photosensitive sheet - exposure; changing a latent image into a visible image - developing; stabilizing a visible image - fixing.
April 02, 2020