| 摘要 |
PCT No. PCT/FI86/00065 Sec. 371 Date Feb. 20, 1987 Sec. 102(e) Date Feb. 20, 1987 PCT Filed Jun. 19, 1986 PCT Pub. No. WO86/07640 PCT Pub. Date Dec. 31, 1986.A method for making an image line (10) with a laser beam, according to which the laser beam is created by a laser (1) the intensity of the laser beam is modulated by an external modulator or by said laser (1) said modulated laser beam is fed into a coding element (2,3), by means of which at least one of the properties of the laser beam is transformed, e.g. amplitude, phase or direction, using an electrical control signal the coded laser beam is fed into the hologram (9), by means of which the laser beam is transformed into focused image spots (20 . . . 24a,b,c) from said image spots (20 . . . 24a,b,c) an image line (10) is formed on the image plane and said laser beam is guided and transformed by optical elements. According to the invention by means of said coding element (2,3) the above mentioned characteristic of said laser beam is changed so that when changing the input signal to said coding element (2,3) a number of coded, in some sense orthogonal fields are created said optics and said holograms (9) are designed together with the coding element so that with the aid of said hologram (9) the coded fields are separable so that each separate field forms one said image spot (20 . . . 24a,b,c) on said image plane scanning the input signal of said coding element (2,3) across its values, a number of said image spots can be formed (20 . . . 24a,b,c), which form said image line (10) and said coding element (2,3), said optics and said hologram (9) are so designed that the position error of said image spots (20 . . . 24a,b,c) can be diminished by means of electronic circuits. |
