JPS60175049A - Photographic method for making record - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photographic method for the production of records, in particular for use for identification purposes.

A well known identification record contains a color or black and white photograph inserted between a transparent glass protective cover and a backing support sheet. This assembly is laminated to form a durable identification record, better known as a card.

The wider use of cards as security records to achieve personal identification, to ensure authorization to carry out certain activities (e.g. driving license), or to grant admission to restricted areas, or to provide security in economic activities. , its data and/or
Or it means that it is important to make it impossible to imitate the card by changing the photo.

Photographically created identification records usually contain, in addition to a portrait, information in the form of a photograph or a predetermined guarantee system about the individual to whom it was issued, such as signatures, fingerprints, language, likeness, code marks, watermarks, etc. Contains one or more items of information about a mark or grid structure.

According to special methods, pictorial and graphic data information is photographically recorded on one image carrier, as described for example in U.S. Pat. No. 4,011,570; A photographic camera is described for exposing a single photographic light-sensitive material to a separate subject for formation of an image at positions of at least one storage station containing a roll of photographic material, arranged in series. two exposure stations, one of which incorporates masking means for shielding at least two areas of the material, the remainder being exposed at that station; said exposure from said roll (having optical projection means for projecting at least one other image onto another area of the photographic material and one image onto one of the initially occluded areas); a transport means for delivering a predetermined length of photographic material to a station; a cutting means operable to cut said predetermined length of photographic material; and immobilization of said photographic material during operation of said cutting means. web-engaging means upstream of said cutting means, which can be operated intermittently to achieve this.

The camera can advantageously be used to simultaneously produce photographs of at least two images on the same silver halide photographic material suitable for use in the silver complex diffusion transfer reversal (DTR) process. D
The TR process consists of a negative operating with an image receptor material provided with so-called development nuclei in the form of colloidal particles of heavy metals or metal sulphides which act as catalysts for the development of the silver complexes transferred by diffusion into metallic silver. A light-sensitive silver halide emulsion material is used which usually has a functional silver halide emulsion layer. With the above camera, a person outside the camera is photographed simultaneously with data related to that person, which data is introduced onto a card by a typewriter or computer printer and exposed by a light source within the camera body.

However, if a portrait is already available and if the portrait must be reproduced together with personal graphic data, a single light source that produces the same exposure for the graphic data to be reproduced and the portrait to be reproduced may be used. It is desirable to use it.

However, the difficulty is that it is practically impossible to obtain at the same time a correct continuous tone reproduction of portraits and a sufficiently optically dense reproduction of graphic data (halftones or linear data, e.g. typewriter text). . For example, in simultaneous exposure, the reproduced portrait retains the full range of brightness (also called lightness) of the original, and the graphic data (text) is reproduced with too little density, or the reproduced portrait The text either shows a loss of brightness range or is completely rendered at high optical density.

It is an object of the present invention to use different screens for reproducing originals containing graphic data and continuous tone originals to produce high quality continuous tone information and line made records suitable for use in identification records. consists in using a single light source in conditions that result in the reproduction of

Other objects and advantages of the invention will become apparent from the description below.

In accordance with the present invention, there is provided a method for photographically producing a record by simultaneously photographically copying a continuous tone original and a graphic data pattern original in one exposure step and developing the image thus created, wherein the continuous tone original The original image is reproduced by exposing it to a light source, whereby the image-modulated light is projected and propagated through a screen that divides the light image in the form of points of various sizes onto the photographic material, producing graphic data. The original pattern image is reproduced by the same light source, which emits light modulated according to the pattern at 50 to 99
The method is characterized in that the original halftone pattern is simultaneously projected through a dividing screen in the form of dots of substantially the same size within a dot fraction range of %.

Preferably, both the continuous tone original and the graphic data pattern original are positive.

Preferably, the photographic material used in the method of the invention is a photographic silver halide emulsion material. In a very convenient and rapid method of image reproduction, the photographic silver halide emulsion material described above is combined with an image receptor material for forming thereon a continuous tone image and a screened copy of the graphic data pattern. It is a negative-acting type used in the silver complex diffusion transfer transfer reversal method. According to another example, the silver norogenide photographic material is of direct positive type as known to those skilled in the art.

"Point fraction" means the ratio of the percentage of area covered by points to the area left open between the points.

Screens used for continuous tone image reproduction, as well as screens used for graphic data reproduction, preferably have screen borders of 80 to 200 lines per cIn to increase security. Such screen borders are impossible to detect with the naked eye, and it is very difficult to generate PT depending on the subject.

"Screen Rule" means the distance or spacing between adjacent lines or points on a screen, and (1) Screen Rule is 12
It corresponds to 5μ to 50μ.

The screen used to reproduce continuous tone images (portraits) shall be any contact or gravure screen suitable for continuous tone reproduction in which continuous tone changes are simulated by screen points of varying size. I can do it. In practice, contact screens are preferred.

An overview of contact and gravure screens for economical purposes can be found in W.W.W.2.1, West Germany.
Hansu Urmiller Stratsse D-8190 Raster Union-FfFHA-KOH Engineering nooRGm
``Screen Points and Their Applications'', published by bHst Co, KG (198a). A gray negative contact screen is preferably used to produce halftone negatives from continuous tone originals.

The optical density distribution in the point cross section of conventional contact screens, positive contact screens, and negative contact screens is shown in The Handbook of Modern Hearthstone 117 Autographs, Perfect Graphic Arc Damarest, New Chassis, USA, 1965. E. of E. Fred Noemer, pages 86-92. These screens have their dots arranged in a chessboard pattern.

Silver complex diffusion transfer reversal (D
When using the TR-) method, the screen area of the screen used for continuous tone image reproduction is used to expose the area of the true silver halide emulsion material for continuous tone (portrait) reproduction. Depending on the amount of light, a correct reproduction of the continuous tone (ie tonal reproduction) of the original image is obtained on the image receptor material. The screen range, also defined as the density range, is the maximum density (-Dmax) and minimum density (-Dmax) of the screen.
Dmtn).

The contact screen used in the method according to the invention for producing a point-like reproduction of graphic data (line originals) preferably has points with a very sharp transition from the screen's minimum density to its maximum density. "Very sharp transition" means that the distance from the minimum screen point to the claw density is 63 to 5 μm.
It can be seen that the width is 0 to 20μ for a point having a width in the range of . Such types of screens are referred to as high tone point screens or screen colored screens (square wave screens).

When carrying out the silver complex diffusion transfer reversal method in the method of the invention, the highest density (Dm & The exposure amount is
Preferably, the intensity is sufficient to provide light transmission in the densest portion of the screen points to a level just below the level where the developable silver monohalide in the photographic material can be produced.

In a preferred embodiment, the contact screen used for reproducing the graphic data pattern has a characteristic geometrical structure, in order to further increase the recording guarantee, so that the points during the reproduction of the pattern are at least 5
Obtain individual shapes that are only recognizable under magnification.

The production of a contact screen with a screen point having the sharpness transition defined above from Dmin to I) max is carried out by making a copy of the line gravure screen on a photolith or wire material in the camera (with a lens system). Let me give you an example. By properly controlling the amount of light, the required line width is obtained during copying, and then the two copies are placed with their crossed lines superimposed, and the stacked assembly is placed on another lith or wire material. After contact exposure, this material is developed in lithographic tones to form the above-mentioned dense light screen.

By varying the angle between the two heddle screen copies, a chessboard pattern of points with the shape of individual points varying from squares to parallelograms is obtained during printing, which is used as a contact screen according to the invention. put to use. By using superimposed two-line screens of different line widths, the shape of the points can be changed from square to rectangular.

Similarly, in the camera, a diaphragm with a particular shape and size is used, and the shape of the diaphragm is projected onto the photographic material, thus obtaining points with a particular shape in the printed print, which can be converted into graphic data. To act as a screen for use according to the invention in the reproduction of patterns (linear) and to make contact screens with special dot shapes by making copies of cross-line gravure screens on photoliths or wire materials. I can do it.

In the reproduction of the continuous tone image as a screened image, the points may also have a special shape determined by the choice of the screen geometry, and they are only visible under a magnification of at least 5. It can be of any size.

In the wire or wire material, the silver halide contains at least 50 mob % silver chloride, with the balance, if present, being silver bromide and optionally a small amount of silver iodide. Liss gradation indicates high contrast reproduction, ie, having a maximum gradient (gamma) of 10 or more (see pages 54-55 of the aforementioned Handbook of Modern Society Heartstone 7 Otographies). A developer suitable for producing Lithium gradations is described, for example, in British Patent No. 1,376,600.

The invention is illustrated, but not limited to, by the following examples.

Examples: (1) a continuous tone image, such as a black and white or color portrait of the person to be certified, on another opaque white paper substrate; and (2)
A layout containing typewritten text indicating information such as the name, address, date of birth and nationality of the person whose portrait was taken on a separate opaque white paper substrate is prepared using a lens-type camera such as a REPROMASTIR.
It was placed on the copy plate of a 2000 process camera. The above-mentioned Rezlo Master is a product name of Agfa Geweld N.V. of Belgium. In the film plane of the camera was placed Techohy Flu 7 NPC material in close contact with a gray negative contact screen that adequately covered (with a little extra) the area of the photographic material from which the portrait was to be reproduced. In areas where the text portion of the layout must be reproducible, screen-colored screens were placed. The latter screen I) ma in the form of a point over a distance of 4.5μ
It contained a 13μ wide screen point with a transition from x to Dmin. The highest density of screen points of the screen color section screen was 0.78. Points having a rectangular structure with a point percentage of 80 inches are created on the screen.

The screen ruled lines of both of the above screens were 80 lines per 1t:m.

Copyproof NPC is the trade name of Agfa Geguert N.V. of Belgium for a negative-working silver halide emulsion material containing a developer and used in the silver complex diffusion transfer transfer reversal process.

Copy proof NPO material after exposure to copy proof 0
P3B (product name of Agfa Geweld N.V.)
Developed with an aqueous alkaline activator solution in a DTRfA imager. After activation in this device, the copy-proof NPC material was placed in intimate contact with a sheet of copy-proof CPP (trade name of Agfa Geweld N.V., Belgium, for DTR image receptor materials). After 60 seconds of diffusion time, single 7
- A combined image was obtained on the screen, in which the continuous tone information was formed by points of simple size, the graphic information having a point percentage of 80 inches, with almost the same point size. It is composed of rectangular points.

The resulting image was encapsulated between thermowarmable resin sheets by lamination, thereby forming an identification record protected against forgery.

Claims (1)

[Claims] 1. A method for photographically reproducing a continuous tone original and a graphic data butter/original simultaneously in a single exposure step and developing the image thus created to produce a photographic record, comprising: Reproducing the original color tone, exposing it to light,
The image-modulated light is thereby projected onto the photographic material through a screen which divides the light image in the form of points of varying size, and the reproduction of the original graphic data pattern is carried out by exposing it to the same light source; This simultaneously projects light modulated according to the pattern through a screen that divides the original halftone pattern in the form of substantially the same large dots within a dot percentage range of 50 to 99 inches. how to. 2. The method according to claim 1, wherein the screen has 80 to 200 lines per 1 bell. 3. The method according to claim 1 or 2, wherein the screen is a contact screen. 4. Claims 1 to 4, wherein the screen used to reproduce the positive continuous tone original image is a gray negative contact screen.
The method described in any one of paragraph 3. 5. The screen used to reproduce the original graphic data pattern has a dot width of 63 to 5μ.
5. A method as claimed in any one of claims 1 to 4, in which the screen is a close contact screen with a transition distance between a minimum and maximum density of 20μ. 6. Claims in which the contact screen used for the reproduction of the original graphic data pattern has a geometrical structure, thereby creating specially shaped dots in the reproduction screen that are only discernable under a magnification of at least 5. Section 3~
The method described in any one of Section 5. 7. The contact screen used for reproduction of continuous tone originals has a geometrical structure, which creates specially shaped points in the reproduction screen that are only discernible under a magnification of at least 5. The method according to any one of the ranges 3 to 6. 8. In the camera, make a copy of the line gravure screen on the photolith or wire material so as to create the required line width during copying by controlling the amount of light appropriately, and then make two of the above copies on them. A patent claim for making a contact screen, which is used by placing the lines of the above in an overlapping manner so as to intersect with each other, and by contact exposing the overlapping assembly onto another lith or wire material which is developed in a lith gradation to form the contact screen. The method according to item 5 or 6. 9. Making a copy of the cross-line gravure screen on the photolith or wire material using a diaphragm of special shape and size, projecting the shape of a diamond onto the photographic material, thus having a special shape. 7. A method as claimed in claim 5 or claim 6, in which a contact screen for use is made by obtaining screen dots in the print being formed. 10. A claim in which the exposure is carried out on a photographic silver halide emulsion material for use in a silver complex diffusion transfer reversal process in combination with an image receptor material to form a continuous tone image and a screened copy of a graphic data pattern. The method according to any one of the ranges 1 to 9. 11. In the reproduction of a graphic data pattern, the highest density of dots is such that the exposure used to obtain a correct continuous tone reproduction on the image-receiving material is just enough to create developable silver halide in the photographic material. 11. A method as claimed in claim 10 in which a close contact screen is used which is of sufficient strength to provide light transmission into the densest part of said points down to the level below.