中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

3 records (took 0.017 seconds)

    3.
    发明专利
    未知

    公开(公告)号：DE1295235B

    公开(公告)日：1969-05-14

    申请号：DEI0025980

    申请日：1964-06-02

    Applicant: IBM

    Inventor： M KOSANKE KURT ,  W KULCKE WERNER

    IPC: G02F1/29

    Abstract: 1,062,453. Deflecting light. INTERNATIONAL BUSINESS MACHINES CORPORATION May 29, 1964 [June 5, 1963], No. 22287/64. Heading H4F. Apparatus for varying the position and direction of a beam of light comprises a biaxial crystal 12 and means for producing a beam of light which is plane polarized in a selectable one of a plurality of different planes, eg.an electro-optical device 21, and a quarter-wave plate 24, the incident plane polarized beam 26 being directed along one of the optic axes inside the biaxial crystal so that the phenomenon of internal conical refraction takes place, the position of maximum intensity of the output beam on the cone circle 12b depending on the direction of polarization of incident beam 26. Light from source 15 first passes through polarizer 16 and the resulting plane polarized beam 25 is transformed into a circular, elliptical or plane polarized light beam 28 in electro-optic device 21 depending on the voltage V applied across the electro-optic device by way of transparent or semi-transparent electrodes 22 and 23. Quarterwave plate 24 is so orientated as to transform the circular polarized light beam 28 into a plane-polarized light beam 26, the direction of polarization of which depends on the voltage V. The output beam from cone circle 12b, the position of maximum intensity of which depends on voltage V, is then focused by means of a cylindrical lens 17 on to a curved mirror 13, the resulting light beam 30 having a direction with a predetermined deviation or orientation between 30a and 30b for use in some form of readout apparatus. Instead of using mirror 13 crystal 12 may be replaced by a crystal 31, Fig. 6, having a prismatic shape along its rear face 32. Crystal 31 achieves the same phenomenon of internal conical refraction and the same intensity distribution as crystal 12 of Fig. 1 but in addition deflects the output beam 33 in a particular orientation or direction between the rays indicated at 33a and 33b. The arrangements of Figs. 1 and 6 provide a cos 2 intensity distribution of the conically refracted-light of the crystals 12 and 31, and to improve the beam resolution, the intensity distribution is improved to a cos 4 distribution by means of additional quarter-wave plate 43, electro-optical device 44 and analyser 40 arranged as shown in Fig. 7. The material of the electro-optical device may comprise potassium dihydrogen phosphate, ammonium dihydrogen phosphate or potassium deuterium phosphate and the material of biaxial crystal 12 may comprise naphthalene, anthracene or aragonite. Kerr cells, magneto-optical means and strain or stress optical structures may be used instead of the electro-optical device.

Patent Agency Ranking