Abstract
There are many patented ideas on multi-beam technologies for internal-drum exposure systems, but none have been launched on the market. We also initiated and completed the study on multi-beam recording in the internal-drum system. The mechanism functioned properly, producing parallel lines from three beams in the internal drum. The idea we proposed was a simple optical design. The key components in the system for the mechanism to work are the "two-dimensional deflectors" that use acousto-optic devices. On the other hand, we needed to solve several issues caused by the multi-beam system, such as accurate position control, astigmatic distance adjustment, and so on. In this paper, we explain the new principle of multi-beam recording for the internal drum system, designs of deflectors, optics, and control systems.
