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    3.
    发明专利
    未知

    公开(公告)号：DE1499524A1

    公开(公告)日：1969-10-16

    申请号：DE1499524

    申请日：1965-06-26

    Applicant: IBM

    Inventor： TAVERNIA SINCERBOX GLENN

    IPC: G02F1/31 ,  G06K7/10 ,  G11C13/04 ,  H03M1/00

    Abstract: 1,042,692. Modulating light. INTERNATIONAL BUSINESS MACHINES CORPORATION. March 30, 1965 [June 30, 1964], No. 13340/65. Heading H4F. [Also in Division G4] A system comprises deflection means for deflecting an input beam of plane polarized light from an input path to any selected location on an information storage element whereby the beam is conditioned in accordance with the stored information, means for returning the conditioned light beam through the deflection means to the input path polarized in a plane at 90 degrees to the plane of polarization of the input light beam, and means for separating the input beam from the conditioned beam, wherein the deflection means comprises a series of birefringent crystals with binary-weighted thicknesses arranged along the path of the light beam and each preceded by an electro-optic element adapted when energized to rotate the plane of polarization by 90 degrees. The deflection means laterally displaces the input light beam by an amount depending on what combination of electro-optic elements are energized. The means for separating the conditioned beam from the input beam is a beam splitter. In Fig. 2 (not shown) the unconditioned light emerging from the deflection means is returned to it by a roof-top reflector via a half-wave plate. In Fig. 3 (not shown), the returning means involves a second beam splitter, three quarterwave plates, a roof-top reflector, a plane reflector and an information storage plate. This plate is transparent with reflecting layers spaced periodically through its thickness and reflects selected frequencies in the incident light to indicate the information stored. The plate is described in Specification 1,037,888 which is referred to. The reflected light, after passage through the deflection means &c., is passed through a prism to separate out the various frequencies on to a line of photo-cells. The embodiment also uses an extra electro-optic element and a half-wave plate. Fig. 4 (not shown) shows a slight modification of Fig. 3 (not shown), and Fig. 5 (not shown) shows a further modification in which the information storage element is a character mask to impress on the light beam the shape of a selected character. The beam is finally directed by a rotatable reflector on to a selected part of a photo-sensitive medium to print the character.

    4.
    发明专利
    未知

    公开(公告)号：DE1547353A1

    公开(公告)日：1970-02-19

    申请号：DE1547353

    申请日：1966-06-18

    Applicant: IBM

    Inventor： TAVERNIA SINCERBOX GLENN

    IPC: G11C13/04

    Abstract: 1,082,788. Photo-recording apparatus. INTERNATIONAL BUSINESS MACHINES CORPORATION. May 24, 1966 [June 21, 1965], No. 23102/66. Headings G2A, G2C and G2J. Photo-recording apparatus of the kind in which thin layers of reflecting material are formed in a photographic emulsion 1 by setting up a standing wave in the emulsion for each monochromatic light frequency, the emulsion being modified at the antinodes of the waves to produce light scattering layers spaced in depth at periodic intervals for each frequency present, is further provided with a variable optical mask 5 in the form of a photo-chromic member, and a mask control 6 capable of selectively subjecting areas of the mask to non-visible radiation to control areas of the mask capable of passing visible light, the mask and the control being positioned between the visible light source (not shown) and a reflective surface 3 of mercury used to set up the standing waves in the emulsion. The photo-chromic plate 5 is normally transparent but turns dark when subjected to ultraviolet light, and then becomes clear again when exposed to infrared radiation. The mask control 6 comprises a crystal 7 exhibiting the Kerr effect arranged between transparent electrodes 8 forming part of a circuit which, when a switch 11 is closed, will cause the crystal to rotate the plane of polarization of incident light through 90‹. Ultraviolet light polarized in a plane perpendicular to the drawing is deflected by a beam splitter 14 (which passes light polarized in the drawing plane) through the crystal 7 which, since the switch is closed, renders the ultraviolet radiation plane polarized in the drawing plane. This radiation now falls on the mask plate 5 which becomes opaque, and the radiation is blocked by an analyzer 18 which passes only light polarized in a plane perpendicular to the drawing plane. The switch 11 is opened and infrared light, polarized in the drawing plane, is directed to selected points on the plate 5 by a digital light deflector 20, and is then blocked by the analyzer 18. After the plate 5 has been made clear at all of the points at which the infrared beam was directed, information is written into the emulsion at corresponding points by directing light (28) of the selected frequency through the beam splitter (14) Fig. 3 (not shown), the light being polarized in a plane perpendicular to the drawing plane, and the switch 11 remaining open. The plate 5 may now be darkened again and infrared light directed on to areas on the plate where information corresponding to a different light frequency is to be written in the emulsion. After these areas are cleared, the emulsion is exposed to light of this different frequency. In another embodiment Figs. 4-6 (not shown) the plate (5) is provided with a mask (30) at its upper side, which mask passes light only at locations corresponding to those on the film (1) where information may be recorded. Ultraviolet light is directed at the openings in the mask corresponding to locations not required for a given frequency, thus darkening the plate below some openings (Fig. 4). The film is exposed (Fig. 5) and the darkened areas of the plate (5) cleared by exposure to infrared radiation (Fig. 6), switch (11) being closed for this last stage.

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