What Is The Role Of The Photosensitive Drum in The Photocopier?

The photosensitive drum in the photocopier plays an extremely important role, and it is one of the core components in the photocopying process. Specifically, the role of the sensitive drum can be summarized as follows:

1. Receive optical signals
The drum is first responsible for receiving light signals from the photocopier's optical system. These light signals carry the image information of the original manuscript, and after a series of optical processing, they are illuminated to the sensitive drum in a specific form.

2. Electrostatic latent image is formed
When the light signal shines on the sensitive drum, the sensitive material on the surface of the sensitive drum will change. The photosensitive substance in the exposure area conducts electricity under the irradiation of light, which causes the charge distribution on its surface to change and forms the electrostatic latent image corresponding to the image information. This electrostatic latent image is the basis for subsequent toner adsorption and image transfer.

3. Adsorb toner
After the electrostatic latent image is formed, the developing device in the photocopier delivers the toner near the photosensitive drum. Due to the electrostatic attraction, the toner will be adsorbed to the electrostatic latent image area on the photosensitive drum, forming a visible toner image. This toner image is visually consistent with the image information in the original manuscript.

4. Transfer the image
Next, through the action of the transfer device, the toner image on the sensitive drum is transferred to the copy paper. In this process, the copy paper is precisely positioned between the photosensitive drum and the transfer device, and the toner image is transferred from the photosensitive drum to the copy paper through the action of an electric field or pressure.

5. Fix the image
Finally, after being processed by a fixing device, the toner image on the copy paper is heated and solidified to form a permanent image. In this process, the fixing device releases a certain amount of heat and pressure, so that the toner melts and penetrates into the fiber of the copy paper, so as to achieve the fixing of the image.