GB1373786A - Masking device - Google Patents

Masking device

Info

Publication number
GB1373786A
GB1373786A GB4786671A GB4786671A GB1373786A GB 1373786 A GB1373786 A GB 1373786A GB 4786671 A GB4786671 A GB 4786671A GB 4786671 A GB4786671 A GB 4786671A GB 1373786 A GB1373786 A GB 1373786A
Authority
GB
United Kingdom
Prior art keywords
liquid crystal
light
transparency
layer
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4786671A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB1373786A publication Critical patent/GB1373786A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
    • G03B27/727—Optical projection devices wherein the contrast is controlled optically (e.g. uniform exposure, two colour exposure on variable contrast sensitive material)
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/135—Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/02—Sensitometric processes, e.g. determining sensitivity, colour sensitivity, gradation, graininess, density; Making sensitometric wedges
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/153—Charge-receiving layers combined with additional photo- or thermo-sensitive, but not photoconductive, layers, e.g. silver-salt layers

Abstract

1373786 Modulating light EASTMAN KODAK CO 14 Oct 1971 [19 Oct 1970 (2)] 47866/71 Heading H4F [Also in Division G2] A projected image, such as one produced by illumination of a photographic transparency, is reduced in contrast either by passage through an imagewise mask, formed in a nematic liquid crystal layer 130 located with a transparent photoconductive layer 132 between two transparent electrodes 126, 128, or by passage of illuminating light through such a mask before it reaches the transparency. A D.C. potential is applied between the electrodes, and passage of light through the photo-conductive layer causes it to become conductive locally. Parts of the liquid crystal layer adjacent such conductive portions are changed to a milky white lightdiffusing material under the influence of the D.C. field so placed across them, and form a mask. The projected image, or illuminating light, may pass through either the photoconductive layer or the liquid crystal layer first, and a light source, a photographic transparency, a masking assembly and a sheet of photographic paper may be arranged in sequence. Alternatively a masking assembly S<SP>1</SP> may be located between a light source 102 and a transparency 110 which is to be projected, and may be imaged by passage of light from a second source 124, so directed by a beam splitter 116 and the objective lens 114 of projector P<SP>1</SP> that it passes through the transparency in the opposite direction to that from the source 102. After projection, the imagewise mask is erased by an A.C. potential from A.C. source 135. Suitable liquid crystal materials are N-(p-methoxybenzylibene)-p-butylaniline and a mixture of that substance with chloresteryl oleyl carbonate. The electrodes may be NESA glass, and the photoconductive material may be 4,4<SP>1</SP>-diethylamino-2,21-dimethyltriphenol methane and a polycarbonate resin together with a pyylium dye. A layer of cellulose nitrate, one micron or less. in thickness, may separate the liquid crystal layer from the photoconductive layer, which may suitably be 12 microns and 10 microns in respective thickness.
GB4786671A 1970-10-19 1971-10-14 Masking device Expired GB1373786A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8195970A 1970-10-19 1970-10-19
US8196070A 1970-10-19 1970-10-19

Publications (1)

Publication Number Publication Date
GB1373786A true GB1373786A (en) 1974-11-13

Family

ID=26766178

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4786671A Expired GB1373786A (en) 1970-10-19 1971-10-14 Masking device

Country Status (3)

Country Link
DE (1) DE2151446A1 (en)
FR (1) FR2111293A5 (en)
GB (1) GB1373786A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010554B1 (en) * 1978-11-02 1982-06-16 Rollei-Werke Franke & Heidecke GmbH + Co KG Device for optically suppressing the motion of picture changes in projecting apparatuses
DE68925465T2 (en) * 1988-11-16 1996-06-13 Victor Company Of Japan Optical recording medium and recording / playback system
DE3903101A1 (en) * 1989-02-02 1990-08-09 Agfa Gevaert Ag SCREEN FOR PROJECTION COPIER
US4992824A (en) * 1989-07-31 1991-02-12 Polaroid Corporation Apparatus and method utilizing an LCD for printing
FR2660447A1 (en) * 1990-03-28 1991-10-04 Scanera Ste Civile Rech Optical device for the nonlinear processing of radiation and of images

Also Published As

Publication number Publication date
FR2111293A5 (en) 1972-06-02
DE2151446A1 (en) 1972-04-20

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee