公开(公告)号：DE1472133A1

公开(公告)日：1969-02-13

申请号：DEI0027883

申请日：1965-04-10

Applicant: IBM

Inventor： T SINCERBOX GLENN ,  ERHARD MAX

IPC: G02F1/00 ,  G02F1/31 ,  G11C13/04

Abstract: 1,039,254. Read-only stores. INTERNATIONAL BUSINESS MACHINES CORPORATION. May 6, 1965 [May 25, 1964], No. 19136/65. Heading G4A. In a system for reading data from an optical storage element in which data is stored as lightreflecting layers at spacings corresponding to the recorded light frequency, linearly polarized light is passed in turn through a first beam splitter, a first quarter-wave plate, the storage element, a second quarter-wave plate and a second beam-splitter to a mirror which returns the light to the storage element, there being detector means adjacent each beam-splitter to detect any light coherently reflected from the layers of the storage element. The outputs of the two detectors are ANDed and EXCLUSIVEORed, thus providing a data signal, and an error indication if the outputs are not the same. Frequency and position controls for the readout light are provided.

公开(公告)号：DE1474371A1

公开(公告)日：1969-07-10

申请号：DE1474371

申请日：1965-05-15

Applicant: IBM

Inventor： MAX ERHARD ,  T SINCERBOX GLENN

IPC: G02F1/29 ,  G03B21/11 ,  G11C13/04 ,  G11C17/00 ,  G11B7/00

Abstract: 1,057,963. Photographic type-composing. INTERNATIONAL BUSINESS MACHINES CORPORATION. May 10, 1965 [May 25, 1964], No. 19564/65. Heading B6W. [Also in Divisions G4 and H4] Apparatus for projecting optical images of information stored in a transparent Lippmann film 10 having a number of image areas 12 each responsive to radiation of different predetermined frequencies comprises a light source 16 which directs a beam of light at a selected frequency (filter 22) and linearly polarized (polarizer 20) through a beam splitter 26 and a plurality of electro-optic devices formed by electrooptic crystal 30 and transparent electrodes 32 on opposite sides of the crystal in alignment with each of the areas 12. The information is stored in the film 10 in the form of reflecting layers 14 which may be in the shape of alphabetic or numeric characters and the layers for any one of the characters are spaced from each other distances which are inversely proportional to the frequency of the light which originally effected the depositing of the material forming the layers. When quarter-wave voltage is applied to any one of the electro-optic devices, plane polarized light passing through that device becomes circularly polarized and if the area receiving light from this device contains stored information corresponding to the light frequency, then the circularly polarized light is reflected back through the same electro-optic device and becomes plane polarized at 90 degrees to the original beams polarization direction. The reflected light then passes through the beam splitter, which splits the beam according to polarization, and a light deflector 40 to a photo-sensitive medium 46 for effecting a printing of the information. At each of the electro-optic devices not energized, light passes through them without any change in polarization and is reflected back to the beam splitter polarized in a plane which causes the light to return over the same path as that of the interrogating beam from source 16. Deflector 40 is such that a light beam entering it at any point is deflected to a common point 42, medium 46 being moved relative to deflector 40 for effecting printing on a line. Filter 22 is adjusted by the operator so that the frequency of the light delivered to the film corresponds to the frequency which caused the formation of the reflecting layers for the character desired. For half-tone reproduction the electrodes 32 are subjected to less than quarter-wave voltage. At any one area on the film there may be a number of different sets of reflecting layers each set being of a different character shape and having the layers within it spaced differently corresponding to different light frequencies. In a second embodiment, Fig. 2, not shown, the film 10 has information stored over its full surface as a picture or page of information and crystal 30 has two electrodes extending over an area equal to that on the film 10 so that the whole picture or page of information is displayed on a photo-sensitive material.

公开(公告)号：DE1573575A1

公开(公告)日：1970-06-18

申请号：DEJ0028449

申请日：1965-06-26

Applicant: IBM

Inventor： FLEISHER HAROLD ,  MAX KOSANKE KURT ,  T SINCERBOX GLENN

IPC: G01N21/45 ,  G02F1/03

Abstract: 1, 070, 336. Photo-electric inspection of coatings. INTERNATIONAL BUSINESS MACHINES CORPORATION. May 25, 1965 [June 29, 1964], No. 22033/65. Heading G1A. [Also in Divisions G2 and H4] The continuity of a reflective coating on a transparent strip is detected by reflecting light off the coated strip and detecting when, in the absence of the coating, interference occurs between light reflected from the two surfaces of the strip. White light from a source 22 is polarized at 24 before entering a monochromator 25 producing an output beam the wavelength of which varies cyclicly at high frequency. This beam is scanned across the strip by a mirror drum 27 or an electro-optic light deflector. Light reflected by the coating is of substantially constant intensity and gives a D. C. output from the photo-cell 62, but when the coating is missing, an A. C. signal results as the wavelength of the incident beam passes through those wavelengths at which constructive and destructive interference occurs between the surfaces of the strip. A high-pass filter 64 detects this A. C. signal and operates a defect marker 32 through an appropriate delay 31. The mirror drum 27 may be omitted and the strip scanned by a linear beam of light transverse to strip. The monochromator may operate utilizing the rotary dispersion of an optically active crystal in combination with an electrooptical rotator as polarizer or analyzer. (See Division G2).