公开(公告)号：US3305834A

公开(公告)日：1967-02-21

申请号：US33480663

申请日：1963-12-31

Applicant: IBM

Inventor： LAWRENCE COOPER ,  KERN RICHARD W

IPC: G02B27/46 ,  G06K9/18 ,  G06K9/74

CPC classification number: G02B27/46 ,  G06K9/183 ,  G06K9/74

公开(公告)号：US3269254A

公开(公告)日：1966-08-30

申请号：US24839362

申请日：1962-12-31

Applicant: IBM

Inventor： LAWRENCE COOPER ,  KERN RICHARD W

IPC: G01D5/38 ,  G02B27/30

CPC classification number: G01D5/38 ,  G02B27/30

公开(公告)号：DE1284128B

公开(公告)日：1968-11-28

申请号：DEJ0027268

申请日：1964-12-29

Applicant: IBM

Inventor： LAWRENCE COOPER ,  WILHELM KERN RICHARD

IPC: G02B27/46 ,  G06V30/224

Abstract: 1,021,077. Automatic character reading. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 21, 1964 [Dec. 31, 1963], No. 51756/64. Heading G4R. Characters and other specimens are identified by generating a diffraction pattern and angularly scanning this to obtain a series of signals from which the pattern may be identified. Monochromatic light from a lamp 50, such as a mercury-area lamp, passes through mask 52 on to collimating lens 12. Alternatively coherent light from a laser may be used. The character or other specimen 16 is placed in the parallel light emerging from the lens 12. Converging lens 18 focuses the transmitted light at a diffraction plane to form a Fraunhofer diffraction pattern such a pattern is invariant to registration of the specimen 16 being always centred at the centre of disc 24. The disc 24 is a rotary mask having aligned slots 26. In one form the light passing through the slot is received in a single photo-cell the output of which, as the, disc rotates, is a waveform characteristic of the specimen 16. In the form shown the specimen comprises an array of numerals arranged in several lines and each numeral is formed of a series of five parallel lines at an angle defining the numeral For example the numeral " 1 " is composed of a series of vertical lines, numeral " 2 " is composed of lines inclined a few degrees to the right. The diffraction pattern of such a character is a group of dots lying in a line at right angles to the lines of the characters. As the disc 24 rotates therefore, the slit lets through the patterns of the numerals " 1 ", " 2 " &c. in turn. These patterns are re-converted to numerals by image lens 54 so that while the slit 26 is horizontal all the " 1's " appear positioned according to their positions on the input transparency 16. The image is scanned for each position of disc 24 by a four-sided mirror 60 which sweeps the images of the rows across corresponding photo-cells 64. The output signals are stored in their proper positions in store 68. Specimens on an opaque carrier are first transferred to a transparency by being scanned by a television camera and the signals fed to an electron gun. Two glass plates are positioned in the beam of the electron gun and a charge placed between them. One of the plates carries a thin film of conductive oil which is deformed by the beam from the electron gun and the transmissivity thereby varied sufficiently to give a usable input specimen.