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公开(公告)号：DE1499723A1
公开(公告)日：1970-04-30
申请号：DE1499723
申请日：1966-10-11
Applicant: IBM DEUTSCHLAND
Inventor： JEROME HARRIS THOMAS , WOLFGANG KULCKE WERNER , MAX KOSANKE KURT , MAX ERHARD
Abstract: 1,104,163. Optical information storage system. INTERNATIONAL BUSINESS MACHINES CORPORATION. 11 Oct., 1966 [14 Jan., 1966], No. 45364/66. Heading G4A. An optical information storage system includes scanning means responsive to binary address signals for illuminating a selected area of an optical information record by deflecting a light beam appropriately over the record, and monitoring means responsive to the parity of each address applied to the scanning means for subtracting the emanation from the selected area of the record from that from another similar area of the record to provide an information indicating output. High intensity light from a monochromatic light source 10 is passed through a collimating lens 12, through a linear polarizer and through an aperture in a plate to a first unit 14 of a light deflection unit 14 including a plurality of deflection stages. Each stage comprises a birefringent means (22, Fig. 2, not shown) preceded by an electro optic element which provides an output beam polarized either in a first direction or a second direction at 90 degrees to the first, the birefringent means allowing one beam to pass through normally but causing the second beam to be diffracted and to leave the means at a position spatially separated from the first beam. Deflection stages are arranged in increasing order of deflection by a factor of two, the unit 14 causing deflections in the x position being followed by a unit 16 causing deflections in the y direction. An optical memory is then read by the light beam. The light beam is directed to the appropriate spot in the optical memory by X position address and Y position address signals which are converted into X and Y switch addresses by exclusive OR circuits 24, 28, an address of 111 requiring a diffraction of 7 positions thus requiring a switch address of 001 since the operation of the first electro-optic element will leave the beam polarized such that all succeeding birefringent means will cause diffraction of the beam. Examination of the switch addresses shows that the parity of the signal indicates from which quadrant of the memory the light beam will emerge, e.g. if the y parity is odd the light beam emerges from quadrant 1 or 2, if even from 3 or 4. Parity check circuits 30, 32 emit signals X1, X2, Y1, Y2 (X1, Y1 for even parity) which are applied to AND gates 50, 52, 54, 56 which indicate which quadrant the light beam is in. The four quadrants are examined by photo-cells 36, 38, 40, 42, one to each quadrant with the outputs of 38, 40, examining quadrants 2, 3 being applied to one difference amplifier 44 and the outputs of the other photo-cells being applied to a difference amplifier 46. It is assumed that the quadrants 1, 4 have the same noise signal produced by extraneous light, and similarly for quadrants 2, 3 so that the difference amplifier acts to subtract the signal due to noise from the data output signal. The resulting signal is then applied via inverters I, if necessary, AND gates 58, 60, 62, 64 and OR gates to the output.
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公开(公告)号：DE1564209A1
公开(公告)日：1972-01-20
申请号：DE1564209
申请日：1966-12-09
Applicant: IBM DEUTSCHLAND
Inventor： JEROME HARRIS THOMAS , MAX ERHARD
Abstract: 1,100,506. Lasers. INTERNATIONAL BUSINESS MACHINES CORPORATION. 2 Nov., 1966 [16 Dec., 1965], No. 49048/66. Heading H1C. In order to select a particular frequency or frequencies of operation in a laser, a frequency selector including an electrooptical crystal is inserted in the laser cavity. In the embodiment of Fig. 2 a helium-neon laser tube 21 with Brewster angle windows is inserted in cavity 25, 26 together with the frequency selector 27. The latter cavity comprises a quartz crystal 28, an electro-optical crystal 29 controlled by a variable D.C. voltage 31, and a quarter-wave plate 30 and is enclosed by Brewster angle windows 34, 35 and filled with an index matching fluid. Because the Brewster angle windows linearly polarize the laser beam parallel to the plane of incidence only light with the correct polarization will leave and re-enter the frequency selective cavity with minimum loss. The quartz crystal 28 rotates the plane of polarization of light by amounts depending on the frequency, Figs. 3, 4 (not shown), and in operation the D.C. source 31 is varied so that the electro-optic rotator rotates the selected frequencies polarization by an amount so that the polarization of the light emerging from the quartz rotator 28 is again in the plane of incidence. The selected frequency passes through cavity 27 without loss, whereas adjacent frequencies are not rotated by the rotator 29 by the correct amount to compensate for the rotation by crystal 28 and their losses are too great for lasing to occur at these frequencies. In a second arrangement, Fig. 6, the linearly polarized beam is passed through a phase plate whose phase shift is a function of the light frequency. The argon or other ionized gas laser tube 40 is arranged in the optical cavity 45, 46 together with a gypsum phase plate 47, an electro-optic phase crystal 48 and a polarizing calcite crystal 49. The linearly polarized light from laser tube 41 is converted into elliptically polarized light by phase plate 47 which ellipticity is a function of light wavelength which light will also suffer losses in passing through the Brewster windows and will not lase. The electro-optical crystal 48 imparts substantially the same phase shift to all wavelengths of light but the amount of shift is a function of the electric field across the plate. The wavelength to lase is selected by varying the electric field across plate 48 so that the phase shift introduced thereby compensates for the phase shift of the selected wavelength produced by plate 47 and this wavelength will pass through polarizer 49 without loss. However, all other lines will remain elliptically polarized and will suffer losses passing through 49 and will not lase. Polarizer 49 may be omitted in certain cases. Plates 47, 48, 49 may be replaced by a single electro-optic phase plate. Two laser lines may be selected by using two phase plates and two electro-optic phase plates in addition to a polarizing crystal which are inserted in the laser cavity, Fig. 8 (not shown). The first wavelength is selected by arranging that the two phase plates cause a resultant phase shift of zero and applying a zero electric field to the electro-optic phase plates and a second frequency is selected by applying proper voltages to the electro-optic phase plates so that the resultant phase shift of all four plates is zero for the second selected wavelength. Two or more wavelengths may be made to lase simultaneously with this arrangement.
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公开(公告)号：DE1524880A1
公开(公告)日：1971-01-28
申请号：DEJ0034983
申请日：1967-11-09
Applicant: IBM DEUTSCHLAND
Inventor： LEONARD DUDA WILLIAM , MAX ERHARD
Abstract: 1,146,492. Delivering sheets. HONEYWELL Inc. 20 May, 1966 [27 May, 1965], No. 22690/66. Heading B6H. [Also in Division G4] Cards C1, C2 ,are deflected on the fly into a stacker 72, Fig. 1, by a solenoid actuated plate 20, the actuation of the solenoid being initiated by card presence detectors PD1, PD2. When PD1 is uncovered by the trailing edge of a card, the solenoid is energized after a predetermined delay so that the card subsequently enters the stacker in a normal stacking position by way of rollers 73, guide fingers 74 and keeper roller 75, see Fig. 3. If the card is to be stacked in an offset position, as at 70 1 , the output of PD2 is used to energize the solenoid. Other card detectors PD3, (PD4) indicate if a card overshoots the deflector or if a stacking jam occurs. Plate 20, Fig. 3, is mounted adjacent the solenoid 12 on flexure members, and comprises overlapping thin plates 23, 25, 27 of different sizes, giving a whip-lash action with substantial follow-through. Backing plate 40 has a return spring 43 for plate 20 and a vent hole 45 to assist in damping the return motion of plate 20 and reduce aerodynamic drag as plate 20 moves away from plate 40.
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公开(公告)号：DE1589957B1
公开(公告)日：1970-06-04
申请号：DEJ0034019
申请日：1967-06-30
Applicant: IBM DEUTSCHLAND
Inventor： HARRIS JEROME , MAX ERHARD
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