In what way did Daguerre invent photography?

Daguerre photography is the first successful photography method in the world. Its basic idea is to expose a copper plate with silver iodide on its surface, then steam it with mercury vapor and fix it with salt water to form a permanent image.

This is a direct positive method that appears on silver-plated copper plates and cannot be printed and reproduced. The basic method is to plate silver on the polished copper plate and smoke the silver surface with iodine vapor to produce photosensitive silver iodide. Put this photosensitive silver plate in the cassette for later use.

When shooting, this kind of silver disk is put into a square box camera with a lens aperture of F3.6, and the exposure time is about 1 minute. After shooting and exposure, the silver surface was developed by mercury vapor fumigation. In the light-receiving part of the silver plate, mercury and silver form a shiny amalgam, forming a bright part of the image. The unexposed part of the silver plate has no amalgam and still exists in the form of silver iodide.

After development, the silver plate was fixed with baking soda solution, and silver iodide dissolved, showing a black copper plate, which constituted the dark part of the image. In this way, an image formed of cream-white amalgam is obtained. The shaded part is transparent, and the dark silver-plated copper plate surface can be seen. It becomes a positive photo.

Daguerre (1 787165438+1October18-18565438+July 01) is a French artist and chemist, who is famous for inventing silver photography. Daguerre was born in Valle de Voize, ile-de-france. I have studied architecture, drama design and panoramic painting, and I am especially good at stage fantasy production, so I have a good reputation. 185 1 year, he died in Bury-on-Marne, which is 0/2km away from Paris/kloc-0. There is a monument on his grave.

Extended data:

Later, Daguerre made the world's first camera according to this method.

His camera is basically the same as the camera we use today, which consists of lens, aperture, shutter, viewfinder and camera box. The lens is an important part of the camera, and the scene forms an image through the lens.

It consists of lenses with different properties and shapes. Daguerre camera has only one focal length, which is f = 75mm；; Aperture is a device installed on camera lens to adjust luminous flux. At that time, the camera was equipped with four kinds of apertures: 4,/kloc-0,/kloc-0 and 16. Shutter is a device used to adjust how much light enters the lens; The viewfinder determines the range of taking photos; A black box is an opaque box, which is used to hold film. Daguerre's ingenious design has been used to this day.

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