JPH0462066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming method, and more particularly to an image forming method suitable for adding information later (add-on) to an already recorded photographic image.

Generally, photosensitive materials using silver halide as a photosensitive component include gelatin, casein, gum arabic,
Silver chloride, silver bromide, silver iodide, silver chlorobromide, silver iodobromide or chloroiobromide are used as protective colloids using natural resins such as egg white or synthetic resins such as polyvinyl alcohol, cellulose derivatives, alginates, and polyvinylpyrrolidone. Silver halide crystals such as silver are uniformly dispersed and suspended and coated onto a support such as glass, acetate, polyethylene terephthalate, baryta paper or resin-coated paper.

This photosensitive material has an image exposure of hydroquinone, N
- Developed with methyl-P-aminophenol sulfate or P-phenylenediamine compound,
A blackened silver image is formed by sequentially fixing with thiosulfate, washing with water, and drying.

Further, a heat-developable photosensitive material using a silver carboxylate such as silver behenate can form a blackened silver image by heat development after image exposure.

According to conventional wisdom, image information created in this way cannot be easily tampered with.

This makes it the only documentary material that has commercial evidence, especially in the field of microfilm.

However, according to research conducted by the present inventors, it has been found that when high-intensity exposure is applied to a processed photosensitive material that does not have photosensitivity, an image can be formed in that area in accordance with the exposure.

Therefore, an object of the present invention is to provide a novel image forming method.

Another object of the present invention is to provide a method for additionally recording images.

When an image-exposed silver halide photographic material is developed, fixed, and washed with water, developed silver is formed in the image-exposed areas, but since this developed silver is in the form of a so-called metal filament, its absorption efficiency for light and heat is low. It is larger than silver in particle form, so when silver in filament form is exposed to high-intensity light, the absorbed energy is converted into thermal energy.
It is presumed that this thermal energy causes some kind of change in the components (gelatin, etc.) present in the vicinity of the developed silver, thereby forming an image, but the mechanism is not clear at present. However, it seems clear that the presence of developed silver plays a major role in forming the additional recorded image.

In the present invention, images can be printed out by high-intensity, short-time exposure, especially when developed silver is present in a range of 3 mm diameter average diffuse photographic density (JIS standard) 0.1 to 1.6. This printed image was not produced in accordance with the photographic method in which a photosensitive silver salt forms image-like silver, but was formed by modifying the components near the developed silver. be. In a preferred embodiment, 3
A density range of mmφ average diffuse photographic density of 0.2 to 1.5, especially 0.3 to 1.4 is suitable.

In embodiments of the present invention, a method of irradiating high-intensity energy over a short period of time is suitable. High-intensity energy sources include xenon flash lamps using condensers, laser light sources (e.g., semiconductor lasers, argon lasers, helium-neon lasers, YAG lasers, argon-krypton lasers, carbon dioxide lasers, etc.), or tungsten lamps. Examples include optical systems using a combination of a mercury lamp, a xenon lamp, a halogen lamp, etc., a condensing optical system, and a high-speed shutter. The effective irradiation time is 10 ^-2 seconds or less, preferably 10 ^-5 seconds to ^{10 -2} seconds, and the energy amount at this time is 10 ^-2 Joule/cm ² to ¹⁰³ Joule/cm ² , preferably 10 ^- A range of ² joules/cm ² to 10 ² joules/cm ² is valid.

As a method for forming developed silver having a 3 mm diameter average diffusion photographic density in the density range of 0.1 to 1.6, a method that appropriately controls the photographic development process can be used, preferably a density of about 0.6 by controlling the photographic development process. If you finish it,
An additional recorded image can be formed at that location using the optical system described above. For example, the density can be controlled within the above-mentioned range by adjusting the development time, developer concentration, amount of development inhibitor added, etc. in the development process, or an appropriate desilvering treatment (bleach-fixing treatment, bleaching and fixing treatment) can be applied after fixing. can be controlled. As a bleaching agent, an oxidizing agent such as acid dichromate, red blood salt, or iron complex salt of ethylenediaminetetraacetate acid can be used.

In another preferred example, an area for adding information is determined in advance when photographing, and a chart paper of a certain density (uniform density, halftone, dot, stripe, etc.) is placed on top of the document. However, it is effective to burn them at the same time. In particular, it is complicated to repeatedly finish a photo to a certain density using the above-mentioned photo development process, and it is also difficult to control only a specific area to a predetermined photo density range. is often not suitable. However, the technical idea of the present invention includes the above-mentioned development process. By choosing the appropriate chart paper,
The method of this example is more preferable in many respects because it allows areas of desired photographic density to be formed as needed. Moreover, it is effective to use the above-mentioned chart paper when repeatedly and additionally recording images are to be stably formed with high contrast and high density.

The image forming method of the present invention is particularly advantageous for adding on silver salt microfilms. This will be explained according to the drawings.

FIG. 1 is a flowchart showing the steps from photographing a document to add-on.

Step 1 is a step of preparing an original to be recorded on microfilm, and Step 2 is a step of placing chart paper in a predetermined area of the original. Then,
A microfilm is created through a step 3 in which a document on which chart paper is stacked is photographed using a microfilm photographing device, and a step 4 in which a developing process is performed according to a predetermined prescription after photographing. This is called step 5.
Step 6 is a step in which image information is imprinted on the area of the microfilm prepared in Step 5 corresponding to the chart paper placed at the time of photography by high-intensity, short-time exposure. At this time, it is preferable that the printed image information be formed as a negative. Therefore, during exposure, exposure is performed through a positive film. Further, it is preferable to print by applying a negative digital signal that is optically scanned with a laser beam. In this way, a microfilm with additional records added can be created. By repeating these steps 1 to 6 several times, appropriate information can be added to the microfilm at any time.

Any photosensitive material that can be used in the present invention can be used as long as it can form developed silver. For example, monochrome negative film, monochrome direct positive film, monochrome paper,
Examples include monochrome direct positive paper, photo-developable photosensitive materials, heat-developable photosensitive materials, X-ray films, and photosensitive materials for laser light.

The term "developed silver" as used herein includes silver formed by a wet development method, silver formed by thermal development, or printed silver.

The present invention replaces the static usage of silver halide photography systems, which have hitherto been thought to be impossible to falsify, with the dynamic usage of silver halide photography systems as a recording system that is responsive to the diversification of today's office automation and microfilm systems. It can be said that this is an extremely useful invention that can change the way it is used.

Hereinafter, the present invention will be explained according to examples.

Example 1 Flatbed Canon 161G for microfilm photography
(manufactured by Canon Inc.) was used. The developer is Canon Monomicrol, a one-bath developer.
Use CM-2F (manufactured by Canon Inc.) and adjust the processing temperature.
The temperature was 32℃.

After loading a 16 mm Canon CLfilm into the photographing device, a document overlaid with gray chart paper with a reflection density of 0.60 was placed at a predetermined location in the photographing device, and photographed and developed. The average diffusion photographic density of the 3 mm diameter area of the processed microfilm corresponding to the area where the gray chart paper was overlapped was 0.50, and the other area was 1.20.

300V was applied to the area of this film with a photographic density of 0.50 and the area with a photographic density of 1.20 via a master (a polyethylene terephthalate film with an aluminum evaporated film in the form of positive letters).
Flash exposure was provided by a Canon Canolite ED (photographic flash lamp) using a 300 μF capacitor and two AA batteries. The energy amount during this exposure was about 10 Joule/cm ² and the irradiation time was about 50 μsec.

Among the images added in this way, the photo density
The photographic density of the image formed in the area of 1.20 is approximately 2.6
, while an image formed in an area having a photographic density of 0.5 was found to have a photographic density of approximately 1.0.

Furthermore, when the surface of the image was observed, it was found that it had changed to a somewhat rough surface and the color tone had changed to brown-gray.

When I observed this microfilm with a microreader, I could confirm that the characters were quite faithful to the printed master.

Example 2 As a light source for the add-on used in Example 1,
When scanning exposure was performed using a 3.8W semiconductor laser instead of a flash lamp with an energy of approximately 10 ² Joules/cm ² , the irradiated area changed and the density increased, and a burn-in image could be confirmed with the reader.

Example 3 A microfilm was prepared in the same manner as in Example 1, except that a halftone dot chart with an area ratio of about 1/2 was used in place of the gray chart paper used in Example 1.

Of the micro-image thus created, the photographic density of the area corresponding to the halftone dot chart was approximately 0.4.
This area was printed by exposure in the same manner as in Example 1. As a result, an image with an average density of 0.8 was formed.

The additional image could be confirmed by microreader observation.

[Brief explanation of the drawing]

FIG. 1 is a flow chart showing the image forming method of the present invention.

Claims (1)

[Claims] 1. By applying high-intensity exposure to areas containing developed silver formed using a photosensitive material that does not contain image-forming components other than the photosensitive material forming the developed silver, the density of the high-intensity exposed areas is increased and the image is improved. An image forming method characterized by additional recording.