Imaging scanner based on integrated light waveguide for laser phototypesetter

Abstract

The imaging scanner based on integrated light waveguide for laser phototypesetter includes a successively set imaging plate, a focusing lens, a light waveguide device and a semiconductor laser. The semiconductor laser has 32-128 channels and work wavelength of 400-1560 nm. The light waveguide device has a substrate and a light waveguide embedded on the substrate, the substrate is made with glass with refractive index of 1.5-1.8 and operation wavelength of 400-1000 nm or silicon with refractive index greater than 1.7 and operation wavelength of 900-1560 nm, and the light waveguide is made of glass or silica with refractive index 0.01-1 % higher than that of the substrate. The present invention has small size, simple control, high speed switch characteristic, decades or over one hundred independently modulated light paths and high phototypesetting quality.

Description

technical field [0001] The invention relates to an phototypesetting scanning device, in particular to an imaging scanning device based on an integrated optical waveguide laser phototypesetting machine. Background technique [0002] The structure of the laser head of the current laser phototypesetting scanning device is very prone to interference due to the use of the same laser beam and the method of optically dividing it into several beams. For example, use a helium-neon gas laser tube on an acousto-optic modulator to generate 8-way light imaging, and then two 8-way spells form 16-way. Since multiple modulated high-frequency signals with the same amplitude and different frequencies are applied to the same plate of the same acousto-optic modulator at the same time to generate multiple diffracted lights with different deflection angles, mutual interference will occur. Due to the interaction of various signals, the synthesis generates complex waves, which is similar to the "b...

AI Technical Summary

Problems solved by technology

But in this way, the recording time of each light on the film is shorter than before. Obviously the recording light is much weaker

To remedy, it is nothing more than to use a gas laser with a higher power rating, which will increase the cost and reduce the efficiency

The center frequency of the commonly used acousto-optic modulator is about 100MHz, and the bandwidth is about 60MHz. The time-sharing method uses a frequency up to 32MHz (when the dot frequency of the imagesetter is 2M and 16 optical outputs) to change the driving load of the crystal. frequency, the crystal itself can no longer make a perfect rigid response, and any untimely response will cause mutual interference of adjacent light

If the optical fiber array is used to transmit imaging, due to its complex manufacturing process, the consistency of the optical path is relatively poor, and the practicability is poor

Images