What can the bottom of a can do?

A simple camera with a metal can can aim at the electric candle and see the scenery outside the window.

Make a simple pinhole camera with cans: poke a small hole in the center of the bottom of cans, cut off the top of cans and cover them with a translucent plastic film. When using it to observe the scenery outside the window, you can see the scenery outside the window on the plastic film.

The basic part includes a sealed camera box, followed by a focusing screen; There is a small hole or a condenser lens in front of the sealed box. You can see a clear image on its screen. If you install a photosensitive film at the position of the screen, you can also take a clear picture, which becomes a pinhole camera. However, this requires a "shutter" and a slot for loading negatives.

Compared with the three-piece tank, the two-piece tank has the following advantages:

① Good sealing performance. The tank body is directly formed by stamping and drawing process, which does not leak and can save the leak detection process.

② Ensure product quality. Two-piece can doesn't need to be sealed by welding, which avoids lead pollution of solder pot, resists high temperature sterilization and ensures product hygiene.

3 beautiful and generous. The tank body is seamless, beautiful in shape, and can be continuously decorated and printed with good effect.