Single emulsion phase and amplitude transparency
AssigneeCalifornia Institute of Technology
InventorRichard B. MacAnally
Life of this patent
Estimating the term…
Abstract
There is provided a simple method and means for recording in any single-emulsion photographic film or plate an optical transparency which independently controls both the amplitude and the phase of the transmitted light at each transverse coordinate of the transparency according to predetermined spatial patterns. The phase and amplitude information are recorded at separate levels within the emulsion.
Claims15
The method of producing a transparency, from a single silver halide photosensitive emulsion layer deposited on a transparent substrate, in which both the amplitude and phase of light transmitted therethrough is independently spatially modulated, comprising
- rendering said emulsion insensitive to light of a particular color within a predetermined thickness thereof, measured from the outside surface of the emulsion toward the substrate,
- exposing said emulsion to an image of an amplitude mask in light of one color to which said emulsion, beyond said predetermined thickness, is sensitive,
- exposing said emulsion to an image of a phase mask in light of another color to which said remainder of said emulsion is sensitive,
- developing and fixing said film, to develop a silver image of said phase mask and of said amplitude mask therein,
- controllably bleaching the developed silver image of said phase mask to produce an image which has phase variation, and
- washing and drying said film.
The method of producing a transparency, from a single silver halide photosenseitive emulsion film deposited on a transparent substrate, in which both the amplitude and phase of light transmitted therethrough is independently spatially modulated, comprising
- dying said emulsion with one color to prevent a subsequently projected image in another color from penetrating more than a predetermined distance through said emulsion,
- rendering said predetermined distance of said emulsion sensitive to light of a color which is different from the light color sensitivity of the remaining portion of said emulsion,
- projecting an image of an amplitude mask in light of the color to which said predetermined distance of emulsion is sensitive at said emulsion,
- projecting an image of a phase mask in light of the color to which the remaining portion of said emulsion is sensitive at said emulsion,
- projecting an image of a phase mask in light of the color to which the remaining portion of said emulsion is sensitive at said emulsion,
- developing and fixing said film,
- controllably bleaching the developed image of said amplitude mask in said developed and fixed film to produce a silver halide image, and
- washing and drying said film.
The method of producing a transparency in which both the amplitude and phase of light transmitted therethrough is independently spatially modulated, using a single silver halide photosensitive emulsion photographic film, wherein said emulsion is deposited on a transparent base, comprising
- dying said emulsion red to prevent a blue image subsequently projected onto the emulsion, from penetrating more than a predetermined distance through the emulsion layer,
- altering the sensitivity of said emulsion to red light to said predetermined distance extending from the surface of said emulsion layer, to render orthochromatic film sensitive to red light and panchromatic film insensitive to red light,
- exposing an amplitude mask to said film using light of one color for recording said amplitude modulated mask in the portion of said emulsion whose sensitivity to red light has not been altered,
- exposing a phase mask to said film with light of second color, for recording phase modulations of said mask in the portion of said emulsion whose sensitivity to red light has been altered,
- developing and fixing said film,
- controllably bleaching the developed image of said phase mask to produce a silver halide image of said phase mask, and
- washing and drying said film.
Dependencies are inferred from the claim text.