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公开(公告)号：DE1549782A1
公开(公告)日：1971-11-18
申请号：DE1549782
申请日：1967-10-11
Applicant: IBM
Inventor： LEONARD DUDA WILLIAM , FLEISHER HAROLD , LEWIS REYNOLDS JERRY
Abstract: 1,138,128. Read-only stores. INTERNATIONAL BUSINESS MACHINES CORP. 4 Sept., 1967 [12 Jan., 1967], No. 40317/67. Heading G4A. Positioning means is controlled by position detecting means responsive to the frequency pattern produced by a Lippmann film registration area in or on the object to be positioned. As described, the object is a Lippmann film optical read-only storage plate, i.e. a transparent photographic plate in which information is stored as light reflecting layers with characteristic spacing by directing light of selected frequencies at areas of the plate e.g. by use of lasers, grating, and electro-optic deflector, to set up standing waves, then removing the plate, developing it, and replacing it. Data is read using selected frequency light again, a grating to separate the frequencies reflected, and photodetectors. To facilitate accurate positioning on replacement, registration information in three areas was recorded along with the data. Registration information is read from two of the areas alternately and compared. The table on which the plate is mounted is rotated in a sense determined by the difference until identical signals are obtained from both areas, then the table is moved rectilinearly in X and Y directions until the signals from the two areas reach standard (equal) values.
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公开(公告)号：DE1572035A1
公开(公告)日：1970-02-19
申请号：DE1572035
申请日：1967-06-30
Applicant: IBM
Inventor： LEWIS REYNOLDS JERRY , TAVERNIA SINCERBOX GLENN , SHAW SCHOBLS RODMAN
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公开(公告)号：DE1299071B
公开(公告)日：1969-07-10
申请号：DEI0031754
申请日：1966-09-12
Applicant: IBM
Inventor： SINCER BOX GLENN TAVERNIA , LEWIS REYNOLDS JERRY
Abstract: 1,103,910. Deflecting light; semi-conductor pulse circuits. INTERNATIONAL BUSINESS MACHINES CORPORATION. 12 Sept., 1966 [13 Dec., 1965], No. 40613/66. Headings H3T and H4F. A beam of plane polarized light from a digital light deflector comprising electro-optic devices 20, 50 and 80, Fig. 1, controlled by circuits 28, 58 and 88 respectively and birefringent crystals 22, 52 and 82, is arranged to automatically scan in repetitive sequence the output positions " 0 "-" 7," by sensing the output position of the light beam and using the resulting signals to control the circuits 28, 58 and 88. Each electro-optic device comprises an electro-optic crystal between a pair of transparent electrodes and is such that if a half wavelength voltage is applied across the electrodes the axis of polarization of the light beam is changed by 90 degrees and thus passes through the birefringent crystals as an extraordinary ray and is deflected. The control circuits 28, 58, and 88 which charge and discharge the electro-optic devices each include a tank capacitor 32 connected to one of the transparent electrodes through an inductance 30, diodes 34 and 36 being arranged at each end of the inductance to block the flow of current towards the inductance, these diodes being by-passed by silicon-controlled rectifiers 38 and 40. The light beam emerging from crystal 82 in any one of the eight positions impinges on a beam splitter 106 which deflects a portion of the light towards light-sensitive diodes 108- 122. These diodes are each connected in a separate series circuit with an amplifier or switch 124 between the positive terminal 126 and the gating terminal of one of the siliconcontrolled rectifiers. The particular silicon-controlled rectifier is indicated at the terminal 128 of each of the series circuits. Initially all three electro-optic devices 20, 50, 80 are discharged and the light beam emerges in " 0 " output position causing diode 122 to conduct which provides a positive output to the gate of rectifier 40 causing it to conduct. When rectifier 40 conducts device 20 is charged and the light beam is deflected from output position " 0 " to output position " 7." The light beam in output position " 7 " impinges on diode 108 causing it to conduct and bias rectifier 100 conductive. This charges device 80 so that both electrooptic devices 20 and 80 are charged and the light beam is deflected from output position " 7 " into output position " 6." The light beam is thus deflected from position to position in a repeating sequence, the electro-optic devices being charged and discharged as tabulated in Fig. 2 (not shown). The silicon-controlled rectifiers and light-sensitive diodes may be replaced by light-activated silicon-controlled rectifiers, Fig. 3 (not shown).
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