Method for destructive electronic development of photo film
OwnerAlfred B. Levineinventor
Life of this patent
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Abstract
A dry electronic method of developing a latent image from exposed conventional photographic film. The film is exposed to a laser light beam having low intensity time-intensity energy integral that is sufficient to raise the energy level in the light sensitive crystals in the film to a condition of energy saturation. The image is extracted by detecting and recording the quanta of energy absorbed by the crystals at each incremental area of the image.
Claims16
A method for destructively developing a visible optical image from a stored latent image in an exposed but undeveloped conventional photographic film, including a dispersion of a light sensitive chemical compound that is variably absorptive of light energy to change its chemical composition, comprising the steps of:
- subjecting each incremental portion of the film having the latent image to an interrogating light beam of constant, low level intensity and of low time-intensity energy integral, thereby to bring about saturation of the chemical compound in the film at that position,
- detecting the quanta of energy of the interrogating beam that is absorbed by the chemical compound at each incremental position,
- and determining from the absorbed energy quanta at each position in the film, the previous degree of light exposure creating the latent image, said light sensitive chemical compound comprising silver halide crystals.
A method for destructively developing a visible optical image from a stored latent image in an exposed but undeveloped conventional photographic film, comprising light sensitive crystals that variably absorb light energy to change chemical composition comprising the steps of:
- subjecting each incremental portion of the film having the latent image to an interrogating beam of constant low intensity actinic radiation of a time-intensity energy integral that is at least sufficient to bring about energy saturation of the crystals in the film at that position,
- detecting the quanta of energy of the beam that is absorbed by the crystals in the film at each position,
- determining from the absorbed energy quanta at each position in the film, the previous degree of light exposure creating the latent image,
- and visibly reproducing the latent image by incrementally recording the quanta of energy absorbed at each incremental position, said light sensitive crystals comprised of silver halide.
A method for developing an exposed photographic film having light sensitive crystals that change chemical composition in response to light energy, disbursed throughout the film, comprising the steps of :
- subjecting a frame of the film previously exposed to a light image to a constant intensity actinic radiation of just sufficient time-intensity energy integral to bring about energy saturation of the crystals in the exposed frame,
- detecting the quantity of such actinic radiation that is absorbed at each position of the latent image to determine the previous degree of light exposure at that position,
- and recording an electrical signal for each such position on the frame, that is proportional to the absorbed actinic radiation, said light sensitive crystals comprised of silver halide.
A method for destructively developing a visible optical image from a stored latent image in an exposed but undeveloped conventional photographic film, comprising the steps of:
- subjecting each incremental portion of the film having the latent image to an interrogating light beam of constant, low level intensity and of low time-intensity energy integral, thereby to bring about saturation of the film at that position,
- detecting the quanta of energy of the interrogating beam that is absorbed by the film at each incremental position,
- and determining from the absorbed energy quanta at each position in the film, the previous degree of light exposure creating the latent image,
- said conventional film employing silver halide crystals.
Dependencies are inferred from the claim text.