DE1253037B - Method and device for evaluating images produced by photographic means - Google Patents

Description

Method and device for the evaluation of photographic means produced images The invention relates to a method for evaluation of images produced by photographic means in which a photographic Film is used, which is insensitive to a wave range of visible light is, in which the film with an imagewise radiation for generating a latent The photographic image is irradiated and the latent image is then developed and at the same time developing for evaluation by visible light of the wave range is illuminated, against which the film is insensitive, as well as on a device to carry out the procedure.

Some photographic applications involve making recordings to view as soon as possible after recording, d. i.e., the period between the recording of data or the like and the evaluation of the records should be extremely be short. This is e.g. This is the case, for example, in radar photography; the one between shooting and the time elapsing to look at the picture must be as small as possible being held. Methods and apparatus of the above type for radar photography are known. For example, in U.S. Patent 2,688,278 one device is used described in which in a recording station data on photographic material at which the photographic material is then transferred to a development station is moved in which the image is both developed and subsequently to one Screen is thrown. U.S. Patent 2,856,829 is another such Device described in which the data is recorded in a station and immediately are developed into the visible image in the same station and at which the developed Footage is moved to a second station where the image is shown on a screen is thrown.

Although the known methods and devices are used for some purposes Provide adequate results, yet with them it always occurs through movement of the photographic material from the recording station to the projection station a delay on.

The invention has for its object a method of the above Art to create in which no such, through the transport movement of the photographic Material-related delays occur.

According to the invention this object is achieved in that the film for imagewise irradiation, for development and for evaluation Illumination is left in one place and that the light used for illumination simultaneously with the imagewise radiation used to create the latent image falls on the film surface. This creates a surprisingly simple process in which the images are already being created, d. H. already during the picture exposed and developed at the same time by the imagewise irradiation, can be viewed at the place of origin. Since the light used for lighting which in the following is mostly referred to as non-actinic light, in contrast to the imagewise exposure radiation, which in the following is mostly called actinic light has no or only slight photochemical effects on the film, the illuminating light can be applied simultaneously with the exposure radiation one and the same point of the film can be raised. The film therefore needs no transport movement between recording the image and viewing it be subjected, but can directly at the recording location can be viewed during its creation. As actinic exposure radiation depending on the type of photographic material used, any radiation, which is suitable for producing photochemical effects on the material in question, be used. Under certain circumstances, a corpuscular radiation could also be used for this purpose be used.

Developing can be done in any known manner depending on the type of photographic material used. For example a photographic material in which there are necessary for development can be used Salts are already embedded within the emulsion layer or in which these Salts are present as an additional layer. The water needed for development could in this case, for example, be sprayed onto the film at the irradiation site or the irradiation site could be considered a high humidity zone be trained. Or it could be a photographic material known, by Light developable type can be used.

In a particularly advantageous embodiment of the invention a heat developable photographic material is used. This results in a very simple process, since the application of heat is very simple and is possible in precisely dosed proportions.

When using a heat developable photographic material is, there is also the possibility of using the method according to the invention in an advantageous manner Way to modify it even further by using as non-actinic light for illuminating Light is used whose wavelength range is at least a part of the visible Area and a part of the heat radiation area includes, and that developing by the radiant heat of the non-actinic light. Through this, that according to the invention the non-actinic light both for illuminating and for Developing is used, there is an extremely advantageous simplification of the Procedure.

The invention is also based on the object of providing a simply structured, but nonetheless reliable device for performing the to create method according to the invention.

This object is achieved according to the invention in that a film guide for feeding a photographic film to an exposure station and for alignment the same is provided in this and that a device for irradiating the Image on the film with an actinic radiation and a device for simultaneous Developing and illuminating the radiated image with a non-actinic light is provided. As a result, it is simply constructed and therefore inexpensive to manufacture Device created with which the inventive method economical and can be carried out safely.

In an advantageous embodiment of the device according to the invention to carry out the process is when using a heat developable Film as a device for simultaneous developing and illuminating a device for throwing infrared and long-wave visible light rays onto the in the irradiation station located film provided. This makes one special simply constructed and therefore particularly economical device created.

The invention is described in detail below with reference to drawings explained. FIG. 1 shows a highly schematic section through an exemplary embodiment a device for performing the method according to the invention, FIG. 2 one the F i g. 1 corresponding section through a modified embodiment a device according to the invention, FIG. 3 is an enlarged front view of FIG in the device according to FIG. 2 used developing device and FIG. Figure 4 is a side view of the developing device of Figure 4. 2, being of clarity some parts have been added and others omitted.

In Fig. 1 shows a device for producing and evaluating photographic decorations, which has a supply roll 3 of a photographic film 4 which is provided with a silver halide emulsion and which contains all the chemicals necessary for development as well as some water stored in the film as moisture or these chemicals and / or which contains moisture in an additional layer applied to the film. An emulsion of this type is described in French patent 1257,893. This photographic film 4 , like many other known films, has the property that it is sensitive to actinic radiation of certain wavelengths and insensitive to light of non-actinic wavelengths. The wave ranges of actinic radiation and non-actinic light can be different, depending on what kind of photographic material it is. The actinic wave range can include, for example, the blue and ultraviolet light wave range, while the non-actinic wave range can lie in the green, red and infrared regions. This photographic film 4 also produces a visible image when it is irradiated with actinic radiation and simultaneously or subsequently heated by infrared light from a lamp 16 or by any other suitable heating, e.g. B. by a hot plate 7. Since heat developable photographic material in the form of films or photographic papers is described in the above-mentioned French patent, this is no longer discussed here.

The photographic film 4 which can be a perforated film strip can, is preferably in by a gear 5 or some other suitable means individual screen steps along the lower surface 6 of the heating plate 7 to one Take-up roll 8 moved. The heating plate 7 can be provided by any suitable heating elements, such as B. by embedded resistance heating elements 9 through which current flows, be heated. Preferably, the back of the film 4 contacts the heating plate 7 when this is moved past her (emulsion side outward) to the lamp 16 at To support heating of the photographic film 4, so that the in this Moisture evaporates and reacts with the emulsion to develop the film. the Temperature of the heating plate 7 and that for suitable Development needed Amount of heat depends of course on the properties of the particular heat developable photographic material that is being used.

Since the film 4 can be sensitive to certain wavelengths of light contained in normal daylight, it is preferable to place the supply roll 3 and the heating plate 7 in any suitable light-tight housing 10 .

The data to be recorded on the photographic film 4 may be characters or images appearing on an end face 11 of a radar screen arranged at one end of a cathode ray tube 12. The cathode ray tube 12 sends an image-wise radiation corresponding to the data to be recorded to a dichroic mirror 13. Since the mirror 13 has a coating which transmits non-actinic light wavelengths and which reflects the actinic radiation, the image-wise actinic radiation is passed through a lens system 14 which has the images actinic radiation image on the film emulsion, thrown onto the photographic film 4. A latent image is formed on the film and is immediately developed into a visible image by the heat supplied by the lamp 16 and the heating plate 7. If it is desirable, the end face 11 of the screen, the mirror 13 as well as the lens optics 14 and a lens 21 can also be enclosed by a housing in order to eliminate the disturbing influences of the ambient light. The lamp 16 accommodated in a lamp housing 15, upstream of which lenses 17, 18 and a filter 19 are connected, forms a source of long-wave light which is partially in the field of vision and which is longer-wave than the actinic radiation and the latent on the photographic film 4 Image is thrown. This light source serves both to heat the photographic material, so that the latent image is developed into the visible image, and to illuminate the photographic material with non-actinic light, so that imagewise, non -actinic light passes through the mirror 13 , since this transmits non-actinic light and is imaged on a screen 22 through lens 21 and optics 14 so that it can be viewed. The filter 19 filters the actinic wavelengths out of the light and only lets through those light wavelengths which are in the long-wave visible range and in the infrared range and which are longer-wave than the actinic radiation. It is clear from this that this optical device therefore serves two purposes, namely on the one hand to supply non-actinic, infrared light to the photographic film 4 for developing the latent image into the visible image and, on the other hand, to supply light of non-actinic, wavelengths lying in the visible range to the photographic film 4, to allow the visible image to be projected onto the screen 22. Even if in the worst case the heating caused by the lamp 16 and / or the heating plate 7 can cause a certain desensitization of the photographic film before the irradiation is completely finished, the photographic film 4 still retains, since the irradiation and development take place simultaneously, sufficient sensitivity so that, upon exposure to actinic radiation, a latent image corresponding to data, characters or images to be recorded results.

In Fig. 2 shows a somewhat modified embodiment of a device according to the invention which has a supply roll 30 of photographic material in the form of a film strip 31 which is coated with a silver halide emulsion. The film strip 31, which can be a perforated photographic film, is moved from the supply roll 30 onto a take-up roll 32 by means of a gear wheel 33 or some other suitable means, preferably in individual frame steps. The filmstrip 31 is passed through a processing station, which is designated as a whole by 34, in which the filmstrip 31 is exposed so that a latent image is formed on it, the latent image is developed into the visible image and in which the visible image is transformed into Projecting it onto a screen 35 so that it can be viewed is illuminated.

A developing device 36 is arranged in the treatment station 34 and is essentially designed as a carriage 37 (see FIGS. 3 and 4). The carriage 37 can be moved by any suitable means, such as e.g. B. a lever 38, one end of which is articulated to a stub shaft 39 of the carriage 37, can be moved back and forth. The other end of the lever 38 is articulated on a stub shaft 41 which is arranged eccentrically on a rotatable disk 42 . In addition, the carriage 37 has pins 43 which extend laterally away from the carriage 37 into grooves 44 which are located in the sides of frame parts 45 which are arranged at a distance. The grooves 44, one of which is shown in FIG. 3 is shown with dashed lines, have two sections which run parallel to one another, but are mutually offset. They also have an inclined connecting part that connects the two parallel sections. The purpose of forming the grooves 44 in this way will be explained below.

A U-shaped bracket 46, in which a free-running roller 47 is rotatably mounted, is arranged above the carriage 37. Two leaf springs 48, one end of which is attached to one side of the carriage 37 and the opposite end of which is attached to the bracket 46, press the bracket 46 and thus the roller 47 against the film strip 31, as shown in FIG. 3 shown. The movement of the bracket 46 under the influence of the spring force is limited by two outwardly extending pins 51 which form stops for the springs 48 .

A supply roll 52 of absorbent tape 53 of any suitable type which is saturated with a chemical developing solution is disposed on a supply spindle 54 on which a clockwise torque is exerted by means of a spring or the like, not shown. The tape 53 is fed over the roller 47 onto a take-up core 55 , which may preferably be located on the carriage 37 and which may be provided with any ratchet of the well-known type, not shown, to prevent the take-up core 55 from becoming entangled Rotates clockwise. The carriage 37 is normally located in the position shown in FIG. 3 position shown with dashed lines, in which it does not touch the film strip 31. When the developing device is actuated to develop an exposed image on the filmstrip 31, the disc 42 is rotated one revolution by any suitable clutch, not shown, which causes only one revolution upon engagement. As a result, the carriage 37 is slidable into the position shown in FIG. 3 moved position shown with solid lines and then back to its normal position indicated with dashed lines. When the carriage 37 moves upwards, since the pins 43 follow the course of the grooves 44, it is moved sideways against the filmstrip 31 . The roller 47, which is under spring force, presses the belt 53, which is saturated with the solution, onto the emulsion in the area of the image surface. The saturated belt 53, which is supported by a plate 56 of the carriage 37, is moved across the image surface with which it is in contact in one direction and then moved back again in the opposite direction when the carriage 37 is retracted to its initial normal position will. The task of the belt 53 is to coat the exposed image area uniformly with chemicals which preferably bring about both the development reactions and the fixing. During its movement across the film strip 31, the belt 53 not only effects the application and distribution of the treatment solution, but also has the additional effect that the treatment solution is in motion and that excess solution is removed from the film strip 31. A glass pressure plate 57 is provided for the film strip 31, against which the rear side of the film strip is pressed. The plate 56 is heatable by any suitable means, e.g. B. by embedded, not shown heating resistors through which electrical current can be passed. The width of the saturated tape 53 is preferably equal to or greater than a picture frame located on the filmstrip 31 so that the entire picture frame can be developed by a single reciprocation of the carriage 37 and the saturated tape 53 over the filmstrip 11.

Claims (12)

Claims: 1. Method for evaluating on photographic Ways of producing images using photographic film which is insensitive to a wavelength range of visible light at which the film with imagewise radiation to form a latent photographic image is irradiated and in which the latent image is then developed and simultaneously with the developing for evaluation illuminated by visible light of the wave range is, whereas the film is insensitive, characterized in that the film (4, 31) for image-wise irradiation, for development and for evaluation Illuminate at one point (6, 34) and that the one used for lighting Light simultaneously with the imagewise used to create the latent image Radiation falls on the film surface (6,34). 2. The method according to claim 1, characterized in that a heat developable photographic material (4) is used. 3. The method according to claim 2, characterized in that that light is used for illuminating, the wave range of which is at least a part of the visible range and a part of the thermal radiation range, and that the development is carried out by the radiant heat of this light. 4. Procedure according to one of claims 1 to 3, characterized in that photographic material with an actinic region that is in the short-wave part of the visible Range begins and extends to even shorter wavelengths. 5. Procedure according to one of claims 1 to 4, characterized in that actinic exposure radiation radiation produced by a cathode ray tube is used. 6. Device for performing the method according to one of claims 1 to 5, characterized in that a film guide (3, 5, 8, 30, 32, 33) for feeding a photographic material (4, 31) to an exposure station (6, 34) and for aligning the same is provided in this and that a device (11, 12, 13, 14) for exposing the image onto the material (4, 31) with an exposure radiation and at least one device (7,16,17,18 , 19, 36, 45, 47, 53, 57) is provided for the simultaneous development and for the illumination of the exposed image with a light which produces little or no photochemical effects. 7. Apparatus according to claim 6, characterized in that when using a heat developable film (4) as a device for simultaneous developing and lighting a device (16,17,18,19) for throwing infrared and long-wave visible light rays on the in the irradiation station located film is provided. B. Device according to Claim 6 or 7, characterized in that, when a film which can be developed by heat is used, a heater (7) for developing the film (4) is provided on the film guide in the exposure station. 9. Apparatus according to claim 7 or 8, characterized in that a light source (16) with lens optics (17, 18) is provided as the device for illuminating. 10. Device according to claim 9, characterized in that the light source (16) has a filter (19) is connected upstream to filter out the actinic exposure radiation. 11. Device according to one of claims 6 to 10, characterized in that an optical system for the Beam path of the actinic exposure radiation is provided and that at least a part (13, 14) of these optics for the beam path of the non-actinic illuminating light for projecting the illuminated, developed image onto a screen (15, 35) is provided. 12. The device according to claim 11, characterized in that in that of the actinic exposure radiation and the beam path of the non-actinic Illuminating light serving part (13,14) of the optics a dichroic mirror (13) is provided, the actinic for the actinic from a radiation source (12) Exposure radiation on the film strip located in the exposure station (4, 31) is oriented reflectively and that for non-actinic illuminating light transparent for projecting the illuminated images onto the screen (15, 35) is. References considered: U.S. Patent No. 2,688,278.