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公开(公告)号：DE1900920A1
公开(公告)日：1969-07-31
申请号：DE1900920
申请日：1969-01-09
Applicant: IBM
Inventor： FLEISHER HAROLD , JEROME HARRIS THOMAS
Abstract: 1,199,530. Read-only stores. INTERNATIONAL BUSINESS MACHINES CORP. 3 Dec., 1968 [12 Jan., 1968], No. 57224/68. Heading G4A. [Also in Divisions G2, H1 and H4] An optical AND gate comprises an electrooptic crystal 16, such as KDP, and a transparent photocathode 14 having transparent conductive coatings 20 and 22 disposed as shown in Fig. 1 within a transparent glass envelope 12. In operation, with switch 48 closed, a light beam 42 which may contain an image, such as a photographic memory containing fields of binary bits represented by light and dark spots, is imaged on to photocathode 14, the emitted electrons from which are accelerated by the potential gradient to crystal 16 e.g. light on area 44 causes area 28 on crystal 16 to assume an electron charge thereby developing a potential across the crystal in that area. To read-out the stored electron image, switch 48 is opened, and a plane polarized light beam 26 from digital deflector 24 is scanned across the crystal 16 and directed via beam splitter 30 and analyser 32 to photo-multiplier tube 36 an output voltage being developed across resistor 38 whenever the beam 26 passes through a charged area of crystal 16 which causes the state of polarization of beam 26 to be changed. An electrical signal proportional to the intensity of beam 42 is thus obtained whenever light in area 44 coincides with light on area 28. The stored charge on crystal 16 is erased prior to the next imaging operation by using an electron flood gun 18. The read-out device may function to provide random accessing of information stored on a memory surface such as a photographic film, Fig. 2 (not shown).
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公开(公告)号：DE1514016A1
公开(公告)日：1969-04-24
申请号：DEJ0028293
申请日：1965-06-05
Applicant: IBM
Inventor： JEROME HARRIS THOMAS
IPC: G02F1/31
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公开(公告)号：DE1564156A1
公开(公告)日：1970-03-05
申请号：DE1564156
申请日：1966-06-07
Applicant: IBM
Inventor： JEROME HARRIS THOMAS , FLEISHER HAROLD , SHAPIRO EUGENE
Abstract: 1,142,957. Light deflectors. INTERNATIONAL BUSINESS MACHINES CORP. 2 June, 1966 [7 June, 1965], No. 24606/66. Heading H4F. A collimated beam of monochromatic preferably circularly polarized radiation 4, Fig. 1, is deflected by directing, e.g. by means of mirror M1, the beam along a path through an ionizable gas in a container, and by creating a magnetic field along the path having an intensity varying progressively across the plane perpendicular to the path by means of polepieces 12 and 14 of electromagnet 16, the gas being excited by means of a radio frequency electric field applied by means of conductive rings 6 and 8. Since the dispersion characteristic of the gas or plasma is a function of the magnetic field, variation in the strength of the magnetic field varies the refractive index of the gas and controlled angular deflection is accomplished. The ionizable gas may comprise Helium, Argon, Krypton or Xenon and is sealed under pressure in glass or quartz cylindrical container 2. The radiation beam may be emitted from a microwave, millimeter or optical maser. The polepieces of electromagnet 16 are shaped to provide a magnetic field with constant gradient between the upper and lower surfaces of container 2. It is arranged that the electrons gyrate in the ionized gas in the same sense as the beam is circularly polarized. If the incident beam is plane polarized its plane of polarization is rotated after passing through the gas. The actual deflection in the gas takes place due to the fact that each point on the wavefront travels at a different velocity. The deflection may be controlled by varying the magnetic field strength and/or the electron density. Solid bismuth which exhibits cyclotron frequency phenomena and is transparent to long wavelength radiation may be used to increase the electron densities.
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公开(公告)号：DE1472142A1
公开(公告)日：1969-01-09
申请号：DE1472142
申请日：1965-07-23
Applicant: IBM
Inventor： JEROME HARRIS THOMAS , WOLFGANG KULCKE WERNER , ERHARD MAX DR
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Patent Agency Ranking
公开(公告)号：DE1958466A1
公开(公告)日：1970-06-11
申请号：DE1958466
申请日：1969-11-21
Applicant: IBM
Inventor： JEROME HARRIS THOMAS , MAX ERHARD
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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：DE1547380A1
公开(公告)日：1970-01-22
申请号：DE1547380
申请日：1966-12-22
Applicant: IBM
Inventor： JEROME HARRIS THOMAS
Abstract: 1,124,139. Light deflectors. INTERNATIONAL BUSINESS MACHINES CORP. 1 Nov., 1966 [27 Dec., 1965], No. 48811/66. Heading H4F. [Also in Division G2] A light deflector comprises a birefringent element 43, 65 or 66 immersed in a medium 23 having a refractive index which matches the higher index of the birefringent element so that light polarized in a direction parallel to one axis of the element is transmitted while light polarized in a perpendicular direction is reflected; a reflected beam is aligned with the original direction of the light beam by means of an alignment plate 45, 67, or 68 which has a refractive index equal to or less than that of the lower index of the birefringent element. As shown, a series of birefringent elements and alignment plates is immersed in a fluid bath which may be oil or chlorinated diphenyl. The direction of polarization of light incident on each birefringent element is selected by means of a Kerr cell 31, 51, 53 arranged immediately before the associated birefringent element. A beam of light from a laser 13 is polarized and then passes through a window 25 in the chamber 21 containing the fluid bath 23 to the first Kerr cell. The emergent beam passes through a second window 29 in the chamber at a selected one of eight positions.
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公开(公告)号：DE1449772A1
公开(公告)日：1968-12-05
申请号：DE1449772
申请日：1964-05-02
Applicant: IBM
Inventor： FLEISHER HAROLD , JEROME HARRIS THOMAS , SHAPIRO EUGENE
IPC: B23K26/00 , B23K26/06 , B23K26/12 , G02F1/29 , G03G5/022 , G06K1/12 , G11B7/003 , G11B7/085 , G11B11/03 , G11B11/105 , H04N5/76 , H04N5/82
Abstract: 1,026,317. Lasers. INTERNATIONAL BUSINESS MACHINES CORPORATION. April 28, 1964 [May 1, 1963], No. 17489/64. Heading H3B. [Also in Divisions G2 and G5] Information is recorded on a thermoplastic surface by using a laser beam to heat the surface and cause local deformations in the surface. In Fig. 1, the beam from a laser 16 is split by a half-silvered mirror 20 and part of the beam is focused by a lens 26 on to the tape record 10 to melt its surface and thereby erase any information previously recorded. The other part of the beam is reflected by a mirror 28 through a variable focus lens 34 and a fixed focus lens 36 on to the tape which has previously been electrically charged by a unit 30. The lens 34 is adapted to focus or defocus the beam under the control of an information source 37, and when the beam is focused the record is heated sufficiently to cause local deformation of the surface under the influence of the electrostatic charge and surface tension. The laser 16 may be pulsed or continuous wave and may use calcium fluoride doped with divalent dysprosium, calcium tungstate doped with trivalent neodymium, ruby, or a gas such as helium, neon, argon, krypton or xenon, or a semi-conductor gallium arsenide diode.
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公开(公告)号：DE1616220B1
公开(公告)日：1972-05-31
申请号：DEI0035423
申请日：1968-01-05
Applicant: IBM
Inventor： JEROME HARRIS THOMAS
Abstract: 1,161,860. Optical communication system. INTERNATIONAL BUSINESS MACHINES CORP. Dec.15, 1967 [Jan.13, 1967], No.57203/67. Heading G1A. An optical communication system comprises a light source e.g. a multi-coloured laser or a group of arc lamps capable of producing an output including a plurality of wavelengths, means for modulating beams of each such wavelength and for combining them into a single transmission beam, and a receiver wherein the beam is separated into individual wavelengths and applied to detectors to develop respective output signals. The beam from a multi-colour laser 14, Fig. 1, is collimated and applied to a quartz crystal Q 1 wherein eight selected wavelengths have their polarization rotated respectively by 0 90 180 270 0 90 180 270 and the two sets of four beams of parallel polarization are separated by a birefringent prism P 1 . The colours in the two beams are rotated by respective quartz crystals Q 2 , Q 3 of half the length of Q 1 each to occupy four positions mutually at right angles but differing in the two sets by 45 degrees. The beams are split by birefringent prisms P 2 , P 3 and a further stage of crystals and prisms produces eight separate and parallel beams of different wavelengths. The beams may be used in a one way system in which they are combined into a single beam for transmission after being modulated, the combining arrangement being a similar crystal and prism arrangement. A similar but reversed tree is used for re-developing the individual information carrying beams. In a two-way system a broadband arc source 42, Fig. 9, collimated by a lens 44 is applied to an optical tree OT3 through a beam splitter BS3, and separate colour outputs fall on a mirror 56 through paths each including a filter 46, a beam-splitter 48, a birefringent plate 50, quarter-wave plates 52, and electrooptic polarizing crystals 54 to which the information signal is applied as amplitude modulation on a carrier frequency. The reflected beams can pass back through the prisms only if polarized by respective information signals in the crystals 54, and they are recombined by the optical tree for transmission through beam splitter BS3. The incoming information signals are separated in tree OT3 and reflected by respective beam splitters 48 on to photo-detectors 58, the outputs from which are filtered and registered. The system may be diplex using the same frequency at each end, or, transmission in the two directions can be simultaneous, with different modulating frequencies being used at the two terminals. An alternative arrangement for simultaneous two-way transmission in which transmitted, and received signals are separated by orthogonal polarization is described with reference to Fig. 12 (not shown).
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