The process of laser-scanning the film after scanning the film is the working principle of the laser photoplotter. The working principle of the laser photoplotter is the same as that of the TV set. The printed circuit board image is reflected into the large storage column, and then the laser beam is opened in a one-to-one correspondence according to the cell values ​​in the storage column, and the desired film is obtained by laser scanning.

The main light source of the laser photoplotter is laser, so the laser photoplotter has the advantages of focusing concentration and energy concentration. These advantages are very favorable for the rapid exposure of the film, and the film thus drawn has the characteristics of neat edge and no illusion. The film exposure is carried out by scanning. Regardless of the density of the film, the laser photoplotter can expose the film in the shortest time, so it takes only a few minutes to draw a film with a laser photoplotter, so the laser photoplotter becomes the present. The mainstream of the light painting industry.

According to the structure of the laser photoplotter, it can be divided into an inner cylindrical laser photoplotter and an outer cylinder laser photoplotter.

(1) Inner cylindrical laser photoplotter

The blue laser light emitted by the laser, after passing through the electronic shutter and beam enhancer, is reflected onto the high-speed rotating oblique mirror and finally reflected onto the negative film that is vacuum-adsorbed on the inner wall of the drum. Since the mirror rotating at a high speed is inclined, the light spot reflected on the film forms a continuous line of lines. When the mirror rotates at a high speed, the mirror also moves laterally with its base. Therefore, the distance between each of the rays is extremely short, so that the formed scanning exposure form is strip-shaped.

(2) External drum type laser photoplotter

The laser photoplotter uses a powerful vacuum pump to adsorb the film on the outside of the circular drum. In order to firmly adsorb the film on the circular drum, the roller speed can reach 1500r/min, otherwise the film will be round. The drum is directly pulled out when it is rotated at a high speed.

Therefore, the rotation speed of the outer drum type laser photoplotter is quite different from that of the inner drum type laser photoplotter, and the scanning exposure speed of the outer drum type laser photoplotter is lower than that of the inner drum type laser photoplotter.

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