 Process for making fluoropolymer finish composition |
| Aqueous dispersions of fluoropolymer are commercially available from fluoropolymer manufacturers. T... |
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Method for scanning a laser beam by non-mechanical deflectors
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Inventors: Byckling, Eero; Kajanto, Markus;
Assignee: Unda Oy (Espoo, FI)
Primary Examiner: Arnold; Bruce Y.
Assistant Examiner: Callaghan; Terry S.
Attorney, Agent or Firm: Lowe, Price, LeBlanc, Becker & Shur
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. |
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DETAILED DESCRIPTION What we claim is: 1.
A method for making an image line with a laser beam, wherein the laser beaim is created by a laser, the intensity of the laser beam is modulated by an external modulator or by said laser, said modulated laser beam is directed onto a coding element by means of which the amplitude, phase or direction of the laser beam is transformed using an electrical control signal, the coded laser beam being directed onto a rectangular hologram at a deflection angle determined by said coding element by means of which the laser beam is transformed into focused image spots, and an image line is formed from said image spots on the image plane and wherein said laser beam is guided and transformed by optical elements, the method comprising the steps of: providing two non-mechanical laser beam deflectors, one for vertical deflection and one for horizontal deflection, to form said coding element; transforming and directing said laser beam by means of a lens and at least one grating, mirror or prism; scanning through the deflection angle in a continuous manner in the direction of the image line and in a stepwise manner in a predetermined direction that is perpendicular to the direction of the image line; and feeding the coded laser beam into said hologram which is comprised of a plurality of subholograms, each subhologram being capable of forming more than one said image spot so that different image spots are obtained by changing the incoming angle of the beam in the direction of the image line.
2.
A method as claimed in claim 1 wherein said two non-mechanical deflectors are acusto-optic deflectors or electro-optic deflectors.
3.
A method as claimed in claim 1 further comprising the further step of: changing the direction of said laser beam using an element which includes several subelements, so designed that every subelement directs a beam which hits it at a given vertical deflection angle to a given subhologram and the beam is caused to hit the different said subholograms by changing the vertical deflection angle with a grating, a mirror or a prism
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Optical Systems 
