DE3211946A1 - METHOD AND DEVICE FOR DEVELOPING FILM MATERIAL - Google Patents

Abstract

1. Apparatus for developing punched card microfilms, in which the illuminated film is exposed to a developing fluid in a developer spray pot and is then fixed, characterised in that a radiator (2) emitting radiation which is ineffective in illuminating the film is mounted in the developing area (1) of the developer spray spot (6), and the radiation from the radiator (2) is aimed either directly or indirectly towards a sensor (3) which is arranged in a position of action thereto and which responds to the radiation, the radiator (2) and sensor (3) being arranged so that the radiation is passed to the sensor through a relatively large part of the illuminated area of the film material (4) being developed, whilst the developing process is terminated by means of the output current from the sensor (3) when the film material reaches a given optical density over the abovementioned area.

Description

Method and device

for developing film material

The invention relates to a method for developing films according to the preamble of the main claim and a device for its implementation.

It is well known that exposed films must be subjected to development and fixing.

In particular in the field of microfilming, it is important that the recorded image field corresponds to the specific Correct density values lying in areas. If these are not given, what has happened so far corresponding cant roller devices exclusively on the developed film or the film punch card or the so-called fish has been found, the relevant recordings must be repeated.

This is not only possible with an appropriate control u. fiinrichtungskosten connected, but also with a corresponding labor and material costs.

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Accordingly, it is an object of the invention to provide a To create a method and a device with which this effort can be avoided.

This object is achieved according to the invention with a method according to the main claim.

With this method, which is as simple as it is elegant, the density control is no longer carried out on the already developed film, on which no more corrections are possible and error results only through repetition the recording are to be "repaired", rather it is, so to speak, the creation of the picture The development is followed or controlled and when the desired density is reached, the development is followed canceled.

It is of course essential that, on the one hand, radiation which is ineffective for exposing the film material is used, but on the other hand they respond to the sensor IMBt whose output

via electronics
electricity is then used to terminate the development process in a suitable manner. This can be done, for example, in such a way that, in the case of a microfilm processor camera, the spraying process or. the development process

broke and / or the exposure time of the developer by immediately applying the fixative canceled. This would come into question in particular when processing microfilm punched cards.

However, the procedure is also applicable to the processing of Roll films can be used in automatic developing machines, controlled by the sensor, on the throughput speed of the film can be influenced.

The main factors influencing the recording quality so far have been:

Film speed, exposure setting for each Template, origin of the film material, fluctuations in material batches, color of the templates, fluctuations in power and exposure, Developer quality fluctuations etc.

With this multitude of influencing factors, it was and is unavoidable, despite the appropriate pre-setting the camera that the images are incorrect in terms of density.

As a result of the method according to the invention, they lose Factors essentially their influence, since

to a certain extent controls the entire development process itself, so that in any case and even independently of the quality of the developer itself, flawless recording results can be achieved, so that any observation control on monitors or density value digital displays can be omitted, but this does not exclude that such visual control elements may be present. At least these are appropriately intended to in order to make the actual set value visible when setting the desired density values, which will usually be in the range from 0.8 to 1.2. As sensors, those come into consideration, as they have been up to now are already used in density measurements, it is only essential that not just one point of the developing Image is captured, but an area of what

en
either by a correspondingly large-area sensor or one with several small ones, each of which has separate electrical outlets, and which must be able to be calibrated via the associated circuit and evaluated individually.

Corresponding elements are readily available for the circuit required for this. Both the sound elements and the circuit therefore do not require any special explanation.

Of course, a circuit such that the necessary influence on the termination of the development process is automatically effected, which should not, however, exclude that an operator-bound Intervention ex. via a suitable push button actuation can be set up, which is done by yourself the desired density displays.

The method according to the invention and possible embodiments of the device for its implementation explained in more detail below with reference to the graphic representation of exemplary embodiments.

It shows schematically

Fig. 1 in section with an Entuiicklers spray pot the emitter and the sensor;

Fig.Z,

3 corresponding Entuicklers spray pots with different arrangement of emitter and sensor;

FIG. K shows, in section, a continuous development device with emitter and sensor and FIG

5 shows the assignment of the sensor to the developing image, for example a film punch card

In the figures, all essential and corresponding elements or parts are numbered with the same reference numerals, that is, the development area with 1, the radiator with 2 and the sensor with 3 and the receptacle bzui. Film material with k and the latter regardless of whether it is a film section located in a punched card or from a. Film tape is about.

Other parts of the whole that are not of interest here Recording device, so in particular the camera itself, the template holder ustu. are not shown.

1-3 in various embodiments illustrated spray pot would be bspui. as usual in to introduce the camera case integrated and is, uiie also known, with appropriate devices for the controllable supply of Entujicklerlösung, fixing liquid Provide non-dry air, and many other facilities Suitable solenoid switching valves outside the spray pot and supply lines for said media. Of course, such a Entiüicklertopf, also detached from the camera, part of a be an independent and separate developer.

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In the embodiment according to FIG. 1, the radiator 2 is arranged in the bottom area 5 of the spray pot 6 and the sensor 3 is seated with several individual sensors over the B ^ iId. Area distributed in the film pressure plate 7 with which the film material k is pressed against the cover 8 of the spray pot 6, which is provided with a correspondingly large opening.

The individual sensors 3 / can be adjusted with one another are connected to an adjustable toggle switch, which, in turn, are in connection with the Entuiicklerbzu. Fixing device 9, Io is.

The exemplary embodiments according to FIGS. 2, 3 differ from that according to FIG. 1 only in terms of other arrangements of emitters and sensors, the exposure-neutral radiation emanating from emitter 2 at reflectors is reflected and projected onto the respective sensor 3.

In principle, in all of these exemplary embodiments, the exposure-neutral one becomes during the development process Radiation sent through the film and hits more or less, depending on the progress of the development of the resulting parts of the picture, but also of themselves

/, of which the correct density control is selectively queried will,

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adjusting gray level of the free of picture elements Screen on the bzu. the sensors 3.

As soon as the set density value is reached, takes place A conversion of the sensor output in the associated electronics, which then leads to the development process is broken off in a suitable idea, bspui. by switching on the fixative spray.

The same control bzui. Tax principle is also then applicable when the film material arrives in a continuous developing device according to FIG. 4, and regardless of whether this is in the whole camera construction included, this downstream or whether this is set up completely separately.

As can be seen from Fig. K , in this device the developing area 3 and the fixing area 3 ^{1 are arranged} within the generally naturally light-tight continuous developing device 12. The radiator 2 and the sensor 3 are located on both sides of the film material k , namely just before the film material outlet 13. In this case, the duration of the action of the developer, which of course ^{remains effective until it enters the fixing area 3 1} , can only be influenced by

uierden acted uirkung the Transportgeschuindigkeit k of the film material, that is, in case of need is accelerated Transportgeschuindigkeit or delayed.

In the case of an immediate integration of such Developing equipment in a camera may have to be ensured that there is such a variation in the Flow rate, the flow rate of the film material in the recording area of the camera remains unaffected, uas bspu. through a corresponding Looping the film material is easily possible.

With the method applications described so far, one is largely independent with regard to the image quality of the aforementioned influencing factors, i.e. if necessary, one can for example even largely rely on one exact exposure setting for each individual shot refrain, because you get the optimal result in terms of density automatically by yourself self-controlling development process receives.

The situation is somewhat different in the production of so-called fish, although it is well known Several recordings are arranged one behind the other and one below the other on a film material blank,

but the whole cut with all individual shots for development in the development area 1 dem Developer is exposed. But here too, the method can be used with advantage, because those after the Inclusion of effective influencing factors, namely bspuj. Developer quality, developer temperature, differences in film material with regard to origin and batch fluctuations are automatically recognized by the process recorded or taken into account. Such fish are then treated in correspondingly large spray pots according to Fig. 1-3, the individual sensors 3 in a corresponding large area distribution in the film pressure plate 7 to be ordered.

FIG. 5 shows the assignment of such individual sensors to the image field of a film section 15 in a punch card 16 arranged, clarified.

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Claims (1)

Patent claims: 1. Process for developing film material, in particular Punched card microfilms, the exposed film being exposed to a developer fluid and then fixed, thereby characterized in that the film material to be developed during development with a for exposure ineffective radiation is applied and the density of the developing The film is measured continuously and the development process is terminated when the desired density is reached will. 2. Device for performing the method according to claim 1, characterized by one in the development area Cl) for the / development emitting ineffective radiation Radiator (2), which is positioned directly or indirectly against a is directed to the radiation-responsive sensor (3), and emitter (2) and sensor C3) in such a way are arranged that the radiation through the too developing footage (* ») is directed. / ♦ exposure or · 3. Device according to claim 2, characterized characterized in that the development area (1) is in the form of a known developer spray pot (6) and is adjacent to it to the film passage on one side of the radiator (2) and on the other hand the sensor (3) is arranged. I *. Device according to claim 3, characterized characterized in that the radiator (2) in the bottom area (5) of the spray pot (6) and the Sensor (3) is arranged in the film pressure plate (7) of the spray pot (6). 5. Device according to claim 3, characterized in that the radiator (2) and the sensor (3) arranged in the film pressure plate (7) of the spray pot (G) and both against a reflector (11) arranged in the bottom area (5) of the spray pot (6). 6. Device according to claim 3, characterized in that the radiator (2) and the sensor (3) in the bottom area (5) of the spray pot (6) and against one in the Film pressure plate (7) arranged reflector (ll) are directed. 7. Device according to claim 1, characterized in that the Entuicklungsbereich (1) in the form of a DurchlaufentuicklungsgerMtes (12) and in this before the film material outlet (13) of the radiator (2) and the sensor (3) in mutual üJirkstellung and to the continuous Footage (.k) are arranged.