JPS6298354A - Control method for photographic print developing condition - Google Patents

Abstract

PURPOSE:To perform an optimum control over developing condition by fitting a light guide means which measures the reflection density of the object print to a photographic printing device which takes an averaged photometry to the transmission density of a negative film, and comparing the reflection density of the object print with the reflection density of a reference print. CONSTITUTION:The light guide means 97 is fitted to the photographic printing device and light from a light source 21 is reflected by a reflecting mirror 107 to irradiate the print 81 to be inspected with the reflected light. The reflected light from the print 81 is received by a photodetector 41 and converted photoelectrically to measure the reflected density value of the print. Further, the photometries are taken as to cyan, magenta, and yellow and the mean value of those three colors is calculated by an exposure control part 61. Then, the reflection density value is compared with the mean reflection density value of the respective colors of the reference print and when the density difference is larger than a standard value, developing process condition (developer, development time, etc.) is updated properly. For the purpose, the photographic printing device is utilized, the light guide means is fitted, and the reflected density value of the object print is measured accurately, so the photographic print developing condition is easily controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a developing condition management method for a photographic developing machine that develops photographic paper printed by a photographic printing apparatus.

(Prior Art) Photographic paper printed under appropriate printing conditions by a photographic printing apparatus becomes a photographic print of excellent image quality only when it is developed under appropriate developing conditions corresponding to each photographic paper. Therefore, it is necessary to determine and manage the development conditions so as to always obtain appropriate development conditions.

Conventionally, the development conditions have been managed by the method described below with reference to drawing F.

control strips for developing with the user's print developing machine (the developed print is hereinafter referred to as the test print), and a control strip that is produced under precisely controlled development conditions by a photo manufacturer, etc., and , a reference print (hereinafter, a developed image will be referred to as a reference print) is used to determine the developing conditions of the user's printing developing machine. These control strips and reference strips are printed under precisely controlled printing conditions at a photo maker or the like.

First, the control strips are developed using a printing developing machine on the user's side to produce a test print 8I. The produced test print 81 and reference print 83 are cyan (C) each having eight step densities as shown in FIG.
, magenta (M) and yellow (Y) coloring area 78.77
and 78 and rsTAIN” letterffi iJ
Original part 79, maximum density part 8 marked rD-MAXJ
0.

The development conditions using the test print 81 and the reference print 83 are managed by measuring the photographic densities of predetermined portions of the test print 81 and the reference print 83, so that the photographic density of the test print 81 is equal to that of the reference print 83. This is done by determining whether or not there is a deviation from standard A11 to 1- with respect to the photographic density of . Normally, the color developing portions 78, 77 and 77 (low density portion) 78a for C, M and Y colors.

77a and 78a, 5 stages [1 (high concentration part) 78b,
77b and? 8b and the wood dew base 79, and manage various development conditions, such as the temperature and pH value of the developer, and the conditions of the development timetable, so that appropriate development can be performed at each density. There is.

(Problem to be Solved by the Invention) However, in the past, a separate and expensive C meter was used to determine the reflection density of a photographic printing shade as described above. was.

By the way, the inventor of the present invention investigated various methods for measuring photographic density without using a special, dedicated and expensive densitometer, and found that a previously proposed color photographic printing apparatus (hereinafter referred to as
By using a photo printing machine),
It has been discovered that the reflection density of a photographic print can be determined by using the same basic configuration of the light source, light receiver, and exposure control section of this device.

This photographic printing apparatus has a structure as shown in the main part sectional view of FIG. 753.

In Fig. 753, 21 indicates a light source for photo printing, 23 indicates a correction filter, and 25 indicates a table of the photo printing device, and this table 25 is provided at the opening 27 and the hot side of this opening 27. A positioning bin 29 is provided.

Reference numeral 31 denotes a negative carrier for placing a negative film, and a positioning hole 33 into which the positioning bin 29 is fitted is formed. This negative carrier 31 is usually divided into several types depending on the size of the negative film used as the original image for photo printing, and the table 25k is used as desired.
It is designed to be able to be attached to and detached from.

Also, on the L side of this negative carrier 31 is a lens unit 3.
5, a black shutter 37, and an easel on which photographic paper 39 is set. Also, lens unit 3
In the vicinity of 5, a light receiver 41 having a light receiving element f of a photodiode is installed with its light receiving surface facing the negative carrier 31, so that the transmission density of the negative film mounted on the negative carrier 31 can be determined at A11. It is composed of

Further, the light receiver 41 is connected to an exposure control section 61. The exposure control section 61 has a configuration as shown in FIG.
An amplifier 63 that amplifies the signal from the light receiver 41, an A/D converter 65 that converts the amplified signal into a digital signal, a central processing unit (CPU) 67, a first memory 69, and a second memory 69. , a keyboard 73 as a human-powered device, and an output device 75.

A negative film is placed on the negative carrier 31 of the photographic printing apparatus as described above, and the photographic printing operation is started. light source 21
The light emitted from the camera and transmitted through the negative film is sent to lens unit 3.
5 and is projected onto photographic paper 39.

Also, a part of the light transmitted through the negative film reaches the light receiver 41, and these light receivers 41 detect R (red), G (green) and B (i).
(te) is photoelectrically converted into light parts of each color. From now on 'It! ,
The converted signal is amplified by an amplifier 63 and then inputted to an A/D converter 65 to be converted into a digital signal (transmission density). Next, the CPU 67 calculates fOT using this digital signal and the printing conditions stored in the first memory 69 according to the exposure amount calculation program stored in advance in the second memory 71, and calculates the transparency of each color of the negative film. Each appropriate exposure amount corresponding to the IASe degree is calculated.

When each of the R, G, and B exposures that are currently exposing the photographic paper 39 reach the calculated appropriate exposure amounts for each of the R, G, and B lights, a signal from the CPU 87 is sent. 11) The correction filters 23 of each color and then the black shutter 37 are suppressed into the optical path to end the exposure. In this way, this photographic printing apparatus can print the photographic paper 38 with the correct amount of exposure.

By the way, the negative carrier 31 of the photographic printer has a structure that can be moved freely relative to the table 25. Therefore, if one stage of light guide is provided instead of the negative carrier, this light guide 7
The light source 21 for photographic printing is guided to the table surface on the opposite side from the light source 21 by the step, and the reflection density of the photographic print can be easily measured.

Therefore, an object of the present invention is to easily and accurately measure the reflection density of a print using a light source, a light receiver, and an exposure control f11 section of a conventional photographic printing apparatus, and to measure the reflection density of a print simply and accurately. Based on this, it is possible to determine the developing conditions for a printing developing machine. An object of the present invention is to provide a method for managing photographic print development conditions.

(Step f for solving the problem) In order to achieve this objective, according to the present invention, the reflection density of the test print is compared with the reference density to manage appropriate photographic print development conditions. anger.

A photoprinting device equipped with a light receiver for measuring the transmitted density of a negative film is used. A seven-stage light guide is installed that guides the light to the opposite side and illuminates a position corresponding to the negative film, and the above-mentioned test print is placed at a position corresponding to the negative film, and the reflection density from this test print is measured. is characterized in that it is measured by the aforementioned photoreceiver.

In carrying out this invention, the reference C degree is used as the reflection density of the reference print, and this reflection density is comparable to the above-mentioned negative film mounting δ.
It is preferable to carry out the measurement by making this reference print.

In carrying out this invention, it is preferable to use the recommended concentration as the reference concentration.

(Function) This method of setting photographic print development conditions is commonly used for photographic printing. Using the basic configuration of the light source, light receiver, and exposure control section as is, the degree of reflection e of the print is determined A11, and the photographic print development conditions are determined and managed based on the reflection density information. .

Therefore, there is no need to separately prepare a concentration meter.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that these drawings are merely schematic representations to the extent that the present invention can be understood, and the dimensions, shapes, arrangements, and relationships of each component are not limited to the illustrated examples. In addition, in these figures, the constituent components of times are indicated by the same symbols.

In addition, the same components as those in the prior art are denoted by the same reference numerals.

Song Dynasty: Jt of L First, light source 2 installed in the photographic printer shown in Fig. 3
A device called a neck-mounted, print measurement carrier having one stage of light guide for guiding the light of 1 to the receiver 41 side opposite to the light &; 121 and illuminating the position corresponding to the placement of the negative film. The structure of will be explained.゛Figure 5 (A) and (B)
1 is a perspective view and a sectional view for explaining a first embodiment of a print designation carrier 31. FIG.

In both figures, reference numeral 93 indicates a base plate, and this base plate 93 is formed into a rectangular shape with the same size as the base plate of the negative carrier 31 used in a photographic printer, for example.

This base plate 93 has an iK6 in the negative gear 9f bin 28, which is provided on the table 25 of the photographic printer shown in FIG.
The positioning holes 33 for mounting the printing carrier 91 on the tapes 1 and 25 are sunk.

Further, an area 95 (hereinafter referred to as a placement area 85) for placing photographic prints (not shown), etc. is provided in the center of the base plate 9a. This number area 95 is located at a position that approximately corresponds to the position on the negative carrier 31 where the negative film is placed. In the vicinity of this placement area 95, for example, this placement area 85
A pair of light guide means 97 are provided at opposite positions sandwiching the light guide means 97 . The first stage 97 of these light guides is connected to the light source 21 on the back side of the base plate 93.
(See FIG. 3) is configured to guide the light from the mounting area 95 in the diagonal E direction and illuminate the mounting area 95 from there.

Further, a frame 89 for positioning and fixing a photographic print is installed at the center of the surface of one plate 93 using hinge means 101. The frame 98 may be used as a mask to limit the photometric area.

In this case, a rectangular opening Ffl1103 is provided at a position δ of the base plate 83 where the light guide step 99 is provided. This opening 10
No. 3 is configured such that the opening area gradually increases from the front surface to the back surface of the base plate 93 in order to improve the efficiency of collecting light from the back surface of the base plate 93.

Further, a reflection box 105 is provided on the surface of the base plate 83 around the opening 103 so as to cover the opening 103.

Inside this reflection box 105, an opening 103 of the base plate 93 is provided.
In the optical path of the light incident through the reflective surface 1, for example, the reflective surface 1 is placed in a position where the light can be reflected and the area 95 can be illuminated with the reflected light. Q 107 is provided, and is the wall of the reflection box 105 illuminated through which the reflected light from the reflection mirror 107 can pass? 1
Set up SOS.

'f' True Jf! ``Condition Tube P Method'' Next, the method for managing photographic development conditions of the present invention will be explained.

First, the control strips are developed in a printing developing machine used by the user to produce a test print in the same manner as in the prior art. Furthermore, as before, developed photos supplied by photo manufacturer Kasa! 5 Prepare semi-prints.

・On the other hand, the negative carrier 31 of the photographic printer shown in FIG.
Instead, the print measurement carrier 91 is placed in a predetermined position with respect to the photographic printer. FIG. 1 is a cross-sectional view showing a state in which a carrier for printing Ju11 is installed in a photographic printing apparatus.

Next, the test print 81 shown in FIG. The test print 81 is placed therein. The print 81 to be tested may be spaced apart to a size that makes it easy to place it on the specified position of the carrier for print measurement.Also, the photoreceptor 41, which is placed on the surface of this photoprinting device, is placed at the crotch. LATD(re to Large
Since most of the devices measure uniformity using a Transmittance Density, a mask 89 as shown in FIG. For example, the area of the mask 89 other than the window 89a is black. By using this mask 88, only the measurement area of the test print 81 located on the F side of 89a is exposed, and only the reflected light from this J11 constant area can be efficiently measured by the light receiver 41.

Light emitted from the light source 21 and entering the opening 103 passes through the interior of the reflection box 105 and is reflected by the reflection mirror 107 to create a print to be inspected 81 and is irradiated from the L direction. Next, the already described light receiver 41 receives, for example, the R light reflected from the low density region 78a of the C color developing portion 76 of the print to be inspected 81 and photoelectrically converts it. The 7[air signal obtained by this photoelectric conversion is subjected to precalculation processing by the exposure control unit 61 described above and reflected e].
Get the degree value. This reflection density value is output from the output device 75 of the exposure control section 61, for example, a display. Similarly, the low density portions 78a, 77a, and 78a of each color of the test print 81 and the high C nail portion 76b.

After the reflection densities of 77b and 78b and the unexposed portion 78 are detected by the light receiver 41 and processed by the exposure control section 61, the reflection density value of each of these portions is outputted to 11 "1" by the output device d75.
Next output.

Next, the test print 81 is removed from the print measurement carrier 91, and a reference print is placed in its place, and in the same manner as in the case of the test print described above, the low density areas of each color of the print 83, The reflection C degrees of the high C claw portion and the unexposed portion are each added by Al1, and the resulting density Ila is outputted by the output device 75.

In these 411 lights, the C coloring part 76 of the test print 81 or the reference print 83 is R, the M coloring part 77 is G, and the Y
The light color part is B for the 7th, and 4111 for each corresponding color.
Shine. The unexposed area (STA IN) 79 and the highest density area (D-MAX) 80 are 1L of three colors of R, G, and B.
Black and white CB/W) with an average of 4 rfi and 111
Shine.

Next, the reflection density A1 of each density portion of the test print 81 is compared with the reflection density value of each density portion of the base fermentation print 83 to determine whether the development conditions are appropriate. As a result, if the degree of reflection C of the test print 81 is within a certain standard value with respect to the reflection density of the base print 83, it can be said that the developing conditions are appropriate and there is no problem. Also, if the density difference is larger than the standard value, it can be seen that some parameter of the development processing conditions is abnormal, so it is appropriate to use it! , IJ bad behavior, for example, L from 2 photo makers
It is necessary to update the development conditions, such as replacing the developer or changing the development time, according to the application.

Incidentally, a program for managing developing conditions is written in the second memory 71 of the exposure control section 61 of the photographic printing apparatus, and a comparison list of reflection density A1a is carried out in accordance with this program. You can also do that. Hereinafter, the development condition management mode is designated from the keychain 73, an example of which will be explained. At this time, the development condition management program in the first memory 71 is started via the CPU 87. Subsequently, the test print 81 is placed on the print measurement carrier.

Further, for example, the low concentration portion 78a of the C coloring layer 76 is exposed to light.
The mask 89 (see figure 7jrJ6) is placed on the mask 89 (see figure 7jrJ6) so that the area is set to 0, and the 1111 constant start signal (1111) is manually input from the keyboard 73 to specify the A11 area. After the reflected light from the measurement area is photoelectrically converted by the light receiver 41 according to this signal.

It is converted into a density value by the exposure control i"1181, and the following -
The 0th order stored in a predetermined location of the memory B9 is then determined as to whether or not to continue specifying the reflection density. To continue measurement, set the mask on the next measurement area in the predetermined order and perform the same operation as described above.
The reflection density values of each density portion and unexposed portion of each color of M and Y are sequentially stored in a predetermined position of the first memory 69.

Next, perform the same operation as the test print 81 to obtain the reference print 83.
The reflection density C1 of each density portion of each color of the reference print 83 is sequentially stored in a predetermined position jδ of the first memory 69. Next, an output mode is determined to utilize the measured reflection density I1. Here, if you want to output the density value as it is, C
The density value f+Lt and the density value of the basic print 83 are read +111j times and outputted to the output device 75.

In addition, when calculating the difference between the density value of the test print 81 and the density value of the cow print 83 and further comparing whether the density difference is within standard 11, first, calculate the difference between the density value of the test print 81 and the reference print 83. A portion of the same color and density as the test print 81 (for example, the C coloring layer 76
The C degree values of the low concentration regions 76a) are retrieved from the memory 69, respectively, and the concentration difference between the two is calculated. next,
A comparison of this concentration difference with the standard value is
If a density difference occurs, a print indicating this fact is added to the output value and output. Next, the same operation is performed for the next 11 areas, and the line area f between the test print 81 and the base print 83 is
The comparison result of density values at ij can be output.

In addition, if the base print 83 is black, use the appropriate photo C degree (estimated t2 degree) or +iij provided by the photo manufacturer.
Even if you compare the density of this C degree and the reflection C degree of the test print 81 based on the measured density of
Photo development conditions can be managed.

Figures (A) and (B) are stone views for explaining the first embodiment of the print measurement carrier used in this invention, and parts are omitted. FIG.

In this case, the light guiding means 97 is constituted by optical fibers and is provided at twelve opposite locations near the mounting area 95. Each optical fiber 111 is provided through the plywood 93, with one end facing the region 95 and the other end facing the light source 21.

Furthermore, by cutting the end of the optical fiber east 111 facing the light source 21 obliquely, the cross-sectional area of the optical fiber east 111 with respect to the light source 21 is increased, and the light collection efficiency is increased (seventh Figure (B)).

FIG. 48 is a perspective view for explaining a third embodiment of the print measurement carrier used in the present invention.

In this case, the light guiding means 97 includes an optical fiber east 111 provided through the base plate 93, and a condensing stage 113 consisting of, for example, an optical lens provided at the end of the optical fiber east Ill facing the photographic print. It is composed of In addition, the four-optical F stage 113 of this optical fiber east 111 is not provided.
The end is provided facing the light source 21.

According to the 4R structure of the light guide r stage S7, the light from the light source 2N is guided by the optical fiber east 111, and then the light from the light condensing stage 11
3, it becomes convergent light that can illuminate the print.

In both the second and second embodiments, the base plate 93 is provided with a positioning hole 33 and a frame 99 via the hinge r/step 101, as in the first embodiment.

Furthermore, it goes without saying that these print measurement carriers can be attached to the photoprinting apparatus and used in the same manner as in the first embodiment.

The number and position of the single light guide stage 97 provided on the base plate 93 described in each of the embodiments of the carrier for measuring prints are not limited to these embodiments, and may vary depending on the size of the photographic print and the position thereof. It can be changed depending on the required amount of light to illuminate the photographic print.

In addition, in the embodiment described above, the first stage of light guide is the negative carrier 3I.
It was made into the printing J11 regular carrier 91 to be used in exchange.

However, the present invention is not limited to this. For example, the size of the base plate 93 may be the same as the lower mask (not shown) of the carrier 31. In this case, the lower mask is By removing the lower mask and placing the print measuring carrier 91 in place of the lower mask, effects similar to those of this embodiment can be obtained.

In addition, the first stage of light guide is configured so that it guides the light from the light source to the opposite side of the light source across the position corresponding to the Nekafilm L-11 position, and allows the light to be illuminated from the position corresponding to the negative film support from the light receiving position. It is sufficient if it is a light guide step.

(Effects of the Invention) As is clear from the above-mentioned Theory IJI, according to the photographic print development condition management method of the present invention, the digital carrier of the photographic printing device can be replaced with a print measurement carrier having a light guide stage. They are used interchangeably to guide the light from the light source of the photoprinting device to the photoprint placed on the print 'A11 Sadakawa carrier L on the opposite side from this light source, and to measure the reflection density from this photoprint by the photoprinting device. Since the light source, light receiver, and exposure control section G9 can be used as they are to measure and judge, the photographic print development conditions can be managed based on the reflection density.

In addition, since the printing 611 standard carrier with one stage of light guide can be installed in the position where the negative carrier of the photoprinting device is removed, the photoprinting device can be easily switched and used as a reflection densitometer. I can do it.

Therefore, there is no need to separately purchase and prepare a concentration meter.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining the method of controlling developing conditions for photographic prints according to the present invention, Fig. 7A2 is a plan view of control strips used for controlling developing conditions for photographic prints, and Fig. 3 shows the configuration of a conventional photographic printing apparatus. FIG. 4 is a block diagram of the exposure control unit, and FIG.
A perspective view and a cross-sectional view showing the first embodiment of the carrier for constant use; The rag diagram is a plan view showing the mask of control strips; Figures 7 (A) and (B) illustrate the second embodiment of the carrier for printing Allll cows. Perspective view and side view of main parts, ? FIG. JtI8 is a perspective view for explaining a third embodiment of the print measurement carrier. 21... Light source, 31... Negative carrier 41... Light receiver, 81... Exposure control section 81...
Test print, 83...Print 91...Gear rift for print measurement 97...Light guide stage. Patent applicant: Tomitosha Paige Film Co., Ltd. 2F゛Kutei
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Claims (3)

[Claims] (1) In order to manage the appropriate photographic print development conditions by comparing the reflection density of the test print with the reference density, use a photographic printing device equipped with a light receiver that measures the average transmission density of the negative film, A light guide means is attached to the photoprinting device to guide light from a light source of the photoprinting device to the opposite side of the light source across the position corresponding to the placement of the negative film to illuminate the position corresponding to the placement of the negative film; A method for managing photographic print development conditions, characterized in that the test print is placed at a position corresponding to the placement of a negative film, and the reflection density from the test print is measured by the light receiver. (2) The photograph according to claim 1, wherein the reference density is the reflection density of a reference print, and the reflection density is measured by placing the reference print at a position corresponding to the placement of the negative film. How to manage print development conditions. (3) A method for managing photographic print development conditions according to claim 1, characterized in that the standard density is set to a recommended density.