Please introduce the principle of primary imaging camera?

The distinctive feature of primary imaging camera film is that it has a built-in developing system. To understand how it works, we first need to understand some basics of traditional photographic film. Film is a piece of plastic with a layer of light-sensitive silver compound particles attached to it. Black and white film has only one layer of silver compound, while color film has three layers - the top layer is sensitive to blue light, the next layer is sensitive to green light, and the bottom layer is sensitive to red light. When the film is exposed, the photosensitive particles in each layer react chemically with the corresponding color of light and form metallic silver in that layer. This way you can chemically record light and its color patterns.

To turn it into a photograph, the film also needs to be developed. A developing chemical turns the exposed particles into metallic silver. The film is then processed with three different developers containing couplers. The colors of the three dyes are cyan (a mixture of blue and green light), magenta (a mixture of blue and red light), and yellow (a mixture of green and red light). Each coupler reacts with a corresponding colored layer on the film. In ordinary printing film, the coupler adheres to the grains that have been exposed. In color slides, the coupler adheres to the unexposed areas. Developed color film is a negative image - the colors displayed are the exact opposite of the colors of the original scene. In the slide, two dyes adhered to the unexposed areas combine to create the color captured by the exposed layer. For example, if a green layer is exposed, yellow and cyan dyes will stick to the sides of the green layer, while magenta will not stick to the green layer. The combination of yellow and cyan forms green.

The combination of colors in the development process of a single-imaging camera is the same as in a slide. It has the same photosensitive layer grains as traditional film, arranged on a thin sheet of plastic. But film also contains several additional layers. These layers contain the chemicals required for the development process. Underneath each color layer is a developer layer containing couplers. All of these layers are on top of the black base layer, and underneath the image layer, timing layer, and acid layer. This arrangement is actually a chain of chemical reactions waiting to be triggered.

Non-shot camera film has a complete set of development procedures arranged in chemical layers. The process begins when the reactants enter the photosensitive layer.

The ingredients that initiate the development process are reagents, a mixture of opacifiers, alkali, white pigments, and other ingredients. The location of the reagent is above the photosensitive layer and below the image layer. Before taking a picture, the reagent raw materials are collected at the edge of the plastic sheet, separated from the photosensitive material. This keeps the film from developing before exposure. After you press the shutter to take a picture, the film passes through the camera on a pair of rollers. The roller spreads the reagent across the center of the film, much like a rolling pin would. As the reagent spreads between the image layer and the photosensitive layer, it reacts with other chemical layers in the film. The opacifier material prevents light from penetrating to the underlying layers, so the film is not fully exposed before development.

Reactants move down through the layers, turning the exposed particles into metallic silver. Chemicals then dissolve the developing dye allowing it to diffuse upward into the image layer. There are areas of metallic silver in each layer (the exposed particles) that grab the dye and stop it from moving upward. Only dye that has passed through those non-exposed layers can move to the image layer. For example, if the green layer is exposed, magenta won't be able to move to the image layer, but cyan and yellow will. These colors can be synthesized into a translucent green film on the surface of the image. Reflected light from the white paint shines through these layers of color, much like light from a light bulb shines through a slide.

At the same time, these chemical reagents will also pass down through the photosensitive layer, and other chemical reagents will pass through the film layer above. The acid layer in the film reacts with the base and opacifier in the reagent, making the opacifier transparent. This will give you the image below. The timing layer slows down the reagent's path to the acid layer, allowing the film enough time to develop before exposure.

When you see the image in the photo, you are actually seeing the final step of the chemical reaction. The image is already developed below - you just see the acid layer cleaning out the opacifier from the reagent, so you can see the image.