Technology for using rotating grating for producing laser scan line and scan line correction technology

Abstract

The invention relates to a technique for producing laser scan line by using rotary grating and a scan line correction technique thereof. The correction technique comprises following steps: arranging a holographic rotary grating disk on a rotating object, generating a laser scan line by a laser with wavelength 'Landa' and a first incident angle, and transmitting a laser beam through the holographic rotary grating disk and outgoing from the disk below; arranging a reflector below the laser beam deflection spot region of the holographic rotary grating disk to reflect the laser beam to re-direct the laser beam to the holographic rotary grating disk at a second incident angle as the initial laser incident angle; and re-directing the laser beam by using the combination of an initial scan disk and a prism when the laser beam leaves the holographic rotary grating disk for the second time. The invention can change a spot light source into linear laser stripes and can achieve minimum bow shape and oscillation, thus reducing elements and achieving better performance. By using a holographic device and self-compensation, the invention can obviously lower the cost and improve the quality.

Description

technical field [0001] The invention relates to a laser scanning technology, in particular to a rotating grating installed on a rotating object, when the rotating object and the rotating grating rotate together, the deflected light of the fixed point light source passing through the rotating grating geometrically generates scanning lines, And it can better correct the spot uniformity, linearity and swing correction of laser line scanning, which uses rotating grating to generate laser scanning lines and its scanning line correction technology. Background technique [0002] With the development of science and technology, precise scan lines using holographic rotating devices are becoming increasingly important in industrial applications. For example, US Pat. Nos. 3,953,105 and 5,369,526 use coherent laser light passing through a rotating motor shaft and holographically scanning a magnetic disk redirected to a focal point in these devices. [0003] There are also several patent...

AI Technical Summary

Problems solved by technology

Therefore, its production and assembly process is still relatively complicated

Images