JPH0627939B2 - Development printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention manages the development density when continuously developing a photographic film of a camera, a micro photographic film, or the like, and uses the film after development. The present invention relates to a developing and printing method for controlling the exposure amount when printing or copying on photographic paper.

(Technical background of the invention) When continuously developing a roll film, a micro film or the like of a camera, it is necessary to appropriately control the development density of the film. For example, if the developer is fatigued or the film is fed to the developer too fast, the density becomes low. Further, when the developing solution is thin, the developing solution surface is low, or the developing solution temperature is low, the developing density of the film is similarly thin. Therefore, even if the exposure amount is properly controlled by the automatic exposure control device (AEC) when the image is exposed on the camera side, it is difficult to finish it at an appropriate development density due to the variation in the development conditions during the development processing. There was a problem of becoming.

Therefore, a method may be considered in which the development density is continuously detected during the development process and the development is stopped when the development density is reached. For example
In No. 58-181042, the developer is sprayed onto the stopped aperture microfilm, while the development density of the image during development is constantly monitored, and when it reaches the proper density, the spraying of the developer is stopped and the fixing solution is immediately sprayed. To stop development. However, according to this method, since the average density of the image is obtained, the detected density varies depending on the content of the image.

On the other hand, when printing a microfilm or printing a film on photographic paper, it is necessary to control printing conditions such as the exposure amount according to the development density of the film. Conventionally, the exposure amount is determined by detecting the density of the image portion of the film, but in this case, the detected density changes depending on the content of the image, which causes a problem that an appropriate exposure amount cannot be determined.

(Object of the invention) The present invention has been made in view of such circumstances, and it is possible to always develop to an appropriate density, and to develop an appropriate exposure amount at the time of printing using this film. It is intended to provide a printing method.

(Structure of the Invention) According to the present invention, this object is to perform exposure of a constant exposure amount to the leading end and the trailing end of the photographic film before or in parallel with the development processing of the photographic film. Prior to the development processing of the image area, the density after the development processing of one of the constant exposure areas is detected, the development condition corresponding to the proper density is obtained based on the detected density, and the subsequent image is obtained under the obtained development condition. And the constant exposure area are subjected to development processing, and the exposure amount at the time of printing is determined based on the density of the other developed constant exposure area.

(Principle) FIG. 3 is a diagram showing density / exposure amount characteristics, and FIG. 4 is a diagram showing an example of a finished roll film. The characteristic A in FIG. 3 shows the ideal change in the development density D when the exposure amount E is changed in a certain film. Image exposed portion 16A at the leading and trailing edges of the photographic film
Then, the constant exposure portions 16B and 16C, which have been exposed to the constant exposure amount E ₀ at appropriate intervals, are formed (FIG. 4).

The constant exposure portion 16C becomes the head during development, and the density D after the development changes depending on the development conditions such as the film feed speed V. That is, if the speed V is set to a speed V ₁ slower than the proper speed V ₀ , the density characteristic A increases (becomes darker) as shown by B in FIG. 3, and conversely, the speed V is made faster than the proper speed V ₀ V ₂ Then, as shown by C, it descends (becomes thinner). Therefore, by changing the speed V to the speeds V ₀ , V ₁ , and V ₂ , the development density D is changed from the proper density D ₀ to D ₁ , D
Change to ₂ . Therefore, if the density D at a certain speed V _x can be detected, on the contrary, the speed change amount ΔV for obtaining the proper density D ₀ can be obtained.

In the present invention, the developing conditions such as the speed are obtained so that the proper density D ₀ is obtained, and under this condition, the image portion 16A of the film 16 and the constant exposure portion 16 that becomes the end portion at the time of development.
Develop B.

Further, if the developing conditions are managed in this way, the density D of the constant exposure portion 16B at the end portion should be the proper density D ₀ . The present invention determines the printing condition, that is, the exposure amount when copying or printing using this film 16.

(Embodiment) FIG. 1 is a general view of a camera processor used for carrying out the method of the present invention, and FIG. 2 is a general view of a duplicator. The camera processor shown in FIG. 1 is a combination of a micro camera for copying an original on a micro film and a processor for automatically and continuously developing the film.

In FIG. 1, reference numeral 10 is a photographed document, 12 and 12 are lamps for illuminating the document, 14 is a photographing lens, and 16 is a roll film. Roll film 16 is reel 1
8 is exposed from the film pressure-sensitive adhesive plate 20 in a state of being positioned by the film pressure plate 20, and is further wound on the winding reel 24 via the drive roller 22. After that, the film 16 is guided from the reel 24 to the developing device 28 through the turn roller 26 and the like, and is automatically and continuously developed.

The developing device 28 includes a developing tank 30, a fixing tank 32, a first washing tank 3
4, the second washing tank 36, the film 16 is 30 ~
The tanks 30 to 3 are guided to the racks 30a to 36a in the tank 36.
It is sequentially dipped in the liquid in 6. When the development, fixing, and water washing processes are completed, the film 16 is heated by the heater 38 and the fan 40.
The film is dried in the drying chamber 42 having the above and is housed in the film tray 44.

46 is a CPU, 48 is an input interface, 50 is an output interface, and 52 is a ROM.
In addition to the operating program of the CPU 46, the third 52
The density characteristics shown in the figure, in particular, the density change when the developing conditions are changed for a constant exposure amount E ₀ are stored in advance.

Reference numeral 54 is an optical sensor that detects the leading or trailing end position of the film 16, and this output signal is input to the CPU 46.

Reference numeral 60 denotes a quantitative exposure device for exposing the film 16 with a constant exposure amount. This quantitative exposure device 60 is used for the film 1
A lens, a slit, a diffusing plate, a lamp 62, and a reflecting plate are arranged in order from the one closer to 6, and the lamp 62 is controlled by the CPU 46 so as to emit light at a predetermined position of the film 16. That is, the CPU 46 determines a predetermined position between the leading side and the trailing side based on the leading position and the trailing position of the film 16 detected by the optical sensor 54 and the film feeding speed, that is, the fourth position.
The positions indicated by 16B and 16C in the figure are detected, and when these positions 16B and 16C reach the quantitative exposure device 60, the CP is detected.
U46 causes the lamp 62 to emit light and performs a fixed amount of exposure.
As a result, the positions 16B and 16C of the film 16 become constant exposure portions 16B and 16C. The constant exposure unit 16
B and 16C have an appropriate interval with the image portion 16A.

The film 16 wound on the reel 24 in this manner is then sent to the developing device 28. At this time, one constant exposure unit 16C on the end side at the time of the above-mentioned photographing is used as a head for developing.

A density sensor 64 is installed between the developing tank 30 and the fixing tank 32 to detect the developing density D of the one constant exposure section 16C. This sensor 64 is similar to an infrared sensor because the film 16 is still photosensitive.
It is necessary to use a sensor that uses light in the wavelength range that is insensitive to light. The output of the sensor 64 is input to the CPU 46, and the CPU 46 obtains the amount of change in the developing condition necessary to bring the detected density D to the proper density D ₀ , based on the characteristic of FIG. For example, the film feed speed V can be controlled as a developing condition. CP
U46 controls the film feed speed V to be an optimum speed at which the proper density D ₀ is obtained. For example, if the development density of the constant exposure section 16C is D ₁ when the film is run at a certain speed V _x , the change amount of the speed is ΔV = V
₀ -V _1, and the optimum speed becomes _V x _{+ V} 0 -V _1.
If thereafter performing a development process of the other constant exposure portion 16B sent at this speed V _{x +} V ₀ -V ₁ to the image portion 16A and the last, the image portions 16A and constant exposure portion 16B is managed in a proper developing density Can be done.

The film 16 thus developed with development density control
Are duplicated by the duplicator shown in FIG. In FIG. 2, 100 is a free rotation roller, and 102 is a light source lamp. The developed film 16 is supplied from the reel 104, and the undeveloped raw film 108 is supplied from the reel 110. Both films 16, 1
08 is superposed on the rotating roller 100 and wound on the winding reels 112 and 114, respectively. Then, the image of the film 16 is transferred to the raw film 108 by the lamp 102 during the rolling contact with the rotating roller 100.

Here, the film 16 is delivered from the reel 104 from the left side shown in FIG. That is, the constant exposure unit 16B is at the top. The density of the constant exposure section 16B is detected by the density sensor 116. Reference numeral 118 is a control device such as a CPU. The control device 118 appropriately controls the exposure amount based on the density of the constant exposure section 16B detected by the density sensor 116. That is, the light amount of the lamp 102 or the speed of the take-up reels 112 and 114 is controlled.

In the camera processor of this embodiment, the film 16 is wound on the take-up reel 28 and then guided to the developing device 26, so that the constant exposure unit 16C on the terminal side when the film 16 is photographed is taken.
Is the beginning of development. However, when the film 16 is directly led from the camera to the developing device 28, the film 16
The development feeding direction is reversed. Therefore, in this case, the constant exposure portion 16B of the film 16 becomes the head at the time of development.

Further, the density sensor 64 for detecting the density is a constant exposure unit 16B or 16C which is on the leading side at the time of development at the position of 64A indicated by a virtual line in FIG. 1, that is, immediately after the fixing tank 32.
May be detected. In this case, since the development of the film 16 is stopped by fixing, it is not necessary to use the infrared sensor.

In the above-described embodiment, since the film feed speed V is used as the developing condition to be controlled, the feedback speed of the density control becomes faster, and the density control of the image section 16A becomes more accurate. However, the present invention is not limited to this, and other developing conditions such as the concentration of the developing solution in the developing tank 30, the developing solution amount, and the developing solution temperature may be controlled.

The above embodiment is applied to the duplicator and the camera processor in which the camera for converting the original 10 into a microfilm and the developing device 28 are integrated. However, the present invention is not limited to this, and can also be applied to the development of a roll film of 16 mm or 35 mm used in a normal camera. In this case, a quantitative exposure unit is provided in the developing device or the camera and Constant exposure part 16B at the end and 1
6C should be imprinted. The present invention can be applied to cut films such as microfiche films as long as a large number of cut films are continuously developed. Furthermore, although the present invention is applied to the duplicator for copying a microfilm in the embodiment, the present invention can also be applied to a microfilm reader printer or a printer for printing on photographic paper. The present invention is thus applicable to various developing devices or printing devices and includes such devices.

(Effects of the Invention) As described above, the present invention forms constant exposure portions on the leading side and the end side of a photographic film, and at the time of development, prior to the development processing of the image portion, the development density of one constant exposure portion is Detected, find the amount of change in development conditions to make this density an appropriate density,
By controlling the development conditions before the image area of the film is processed, the development density of the image area and the other constant exposure area is controlled, while the density of the other constant exposure area developed to the proper density is used. It determines the exposure amount during printing. Therefore, the development finish density of the film is stable, and the density can be accurately controlled. Further, at the time of printing, the proper exposure condition can be determined based on the constant exposure portion developed to the proper density.

[Brief description of drawings]

FIG. 1 is a general view of a camera processor used for carrying out the method of the present invention, and FIG. 2 is a general view of a duplicator,
FIG. 3 is a density / exposure amount characteristic diagram of the film, and FIG. 4 is a finished film. 10 ... Original, 16 ... Film, 16A ... Image part, 16B, 16C ... Constant exposure part, 28 ... Developing device, 30 ... Developing tank, 60 ... Quantitative exposure device.

Claims (2)

[Claims] 1. A development process for a photographic film is preceded by or in parallel with exposure of a fixed exposure amount to the leading and trailing ends of the photographic film, while development process for an image part of the photographic film is preceded. The density of one of the constant exposure areas after the development processing is detected, and the development condition corresponding to the proper density is obtained based on the detected density, and the subsequent image area and the constant exposure area are subjected to the development processing under the obtained development conditions. At the same time, the developing and printing method is characterized in that the exposure amount at the time of printing is determined based on the density of the other developed constant exposure portion. 2. The developing and printing method according to claim 1, wherein the developing condition is determined by a film feeding speed for developing the photographic film.