公开(公告)号：DE1499376A1

公开(公告)日：1972-04-20

申请号：DE1499376

申请日：1965-02-12

Applicant: IBM

Inventor： DEWEY ROSHON JUN DAVID ,  YOUNG THOMAS

IPC: B23K15/08 ,  B23K26/20 ,  B23K26/38 ,  G06K1/12 ,  H05K3/02 ,  G06K1/00

Abstract: 1,021,909. Selective printing. INTERNATIONAL BUSINESS MACHINES CORPORATION. Jan. 28, 1965 [Feb. 20, 1964], No. 3734/65. Heading B6F. [Also in Divisions B3 and B4] Documents 2 of paper, metal or ceramic are fed sequentially to a printing station 4 at which ink spots are selectively applied by means of electrodes 5 located near an electrically earthed rotating drum 6 immersed in a tank 7 containing ink, the electrodes being selectively energized with a voltage of about 3,000 volts by means of a keyboard 10. The documents are then fed to an error sensing station 13 connected to comparing means 15 where, for example, the keyed information stored in means 10a is compared with printed information sensed at the station 13. Following station 13, the documents are fed through a path 3c which overturns the documents as they are fed into an error correction station 17 at which the rear surface of the document is presented for spot printing to a row of electrodes 5a similar to electrodes 5. For each error sensed, a corresponding spot will be printed. From station 17, the documents are conveyed to a printing station 18 comprising 80 injection lasers 19 controlled by a power supply 21. Alternatively, a single laser source may be employed in combination with a deflection system.

公开(公告)号：DE1774161A1

公开(公告)日：1971-09-30

申请号：DE1774161

申请日：1968-04-24

Applicant: IBM

Inventor： LOTIS GAMBLIN RODGER ,  DEWEY ROSHON JUN DAVID

IPC: H01S3/101 ,  G11C13/00

Abstract: 1,211,119. Scanning lasers. INTERNATIONAL BUSINESS MACHINES CORP. 3 April 1968 [28 April, 1967], No. 16015/68. Heading H1C. A laser 8, having a partially light transmitting resonator reflector 5a and elements 5, 7 for selecting a particular spatial mode, is associated with a light amplifier 10, which amplifies light which is transmitted through reflector 5a and reflects the amplified light back into laser 8. As a result the energy density within laser 8 prior to selection of a particular mode is relatively high and the delay in the production of the selected mode after actuation of the selection elements is reduced. Elements 5, 7 each Consist of a stack of laminar electro-optic crystals, the crystals in the two stacks extending in mutually perpendicular directions. Also included in laser 8 are lenses 2, 3 and-a polarizer 6. Initially a voltage is applied to all the crystals in both stacks so that light from active medium 1, after being plane polarised by polarizer 6 becomes elliptically polarized by element 7. The light reflected from 7a then loses energy in passing through polarizer 6, a similar process occurring with element 5. Light passing through element 5 and reflector 5a, however, is amplified before being returned to the main resonator. The energy density in the cavity is thus maintained just below the laser threshold for each mode prior to selection. To select a mode the bias voltage is removed from one crystal in each stack so that the selected mode does not become elliptically polarized in elements 5, 7. The losses having been thus reduced this mode is amplified and the lasing threshold is rapidly exceeded.