JP3528066B2 - Light fog detection method and film base density measurement method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an optical head detecting method, and relates to a film base concentration measuring method, to a method of measuring the film base concentration detecting method and original film of the optical head portion of the tip portion of the original image film .

[0002]

[Prior art]

<Prior Art 1> In the photographic printing method, it is necessary to accurately position a frame of an original film such as a negative film on a film mask. For this reason, conventionally, a notch is provided in advance on the side edge of the original image film to detect the position with an optical sensor or the like for frame positioning, or a constant distance is always sent to the original image film for frame positioning. The original film was conveyed, and the edge of the screen was detected by the optical sensor to detect the frame position.

<Prior Art 2> When the film is taken out from the camera with a part of the film stored in the cartridge, the light is fogged at the leading end of the film. This light fog may be erroneously detected when the frame is positioned on the film mask due to photo printing or the like.
Therefore, conventionally, the presence or absence of light fog on the film was visually checked.

<Prior Art 3> If the leading edge of the original image film has a light-fog portion, the frame of the original image film cannot be accurately positioned on the film mask. For this reason,
The fogging position was detected by visually detecting the light fog.

<Prior Art 4> In an apparatus for positioning a frame at a film mask position corresponding to each frame of an original film such as a negative film, the frame of the film other than the frame of the original film is used as a reference. Some measure the density and position the coma.

[0006]

However, in <Prior Art 1>, in the prior art 1 in which a notch is formed on a film by detecting with an optical sensor, it is necessary to accurately correspond to the frame when the film notch is formed. It needs to be taken and requires a lot of labor. Further, in the case of constant feed, there is a problem that the positional deviation is accumulated and the accuracy is poor. Further, the method of detecting the edge of a frame has a problem that the frame position cannot be accurately detected when the density of the edge position of the frame is thin and unclear.

In <Prior Art 2>, a great deal of labor is required to visually observe the light-fogged portion at the leading end of the original image film.

In <Prior Art 3>, a great deal of labor is required to visually detect the light-fogged portion of the original image film to detect the frame position.

In <Prior Art 4>, when there is a hanging punch hole at the leading end of the original film for measuring the density of the film base portion of the original film, the film base density value is affected by the punch hole. There is a problem that it will be done.

[0010]

The present invention has been made in view of the above problems.
SUMMARY OF THE INVENTION An object of the first invention is to provide a light fog detection method for detecting a light fog portion of an original image film.

[0012]

A second object of the present invention is to provide a film base density measuring method capable of measuring the density of a film base portion without being affected by punch holes in an original film.

[0014]

[0015]

[0016]

[Means for Solving the Problems] The above objects are as follows.
It is achieved by various means. That is, (1) while the original image film is being conveyed in the longitudinal direction, while the conveying distance is being detected, the density is measured by the first optical sensor which measures the density in the widthwise photographing screen range of the original image film, and The density is measured by a second optical sensor that measures the density outside the width direction photographing screen range, and the transport distance when the density measured by the first optical sensor exceeds a predetermined density level value is integrated, and The transport distance when the density measured by the second optical sensor exceeds a predetermined density level value is integrated, and either the density measured by the first optical sensor or the second optical sensor is equal to or less than a predetermined density level value. When the above condition continues for a predetermined distance or more continuously, the density measured by the second optical sensor with respect to the transport distance when the density measured by the first optical sensor exceeds the predetermined density level value is Predetermined concentration The optical fog detection method is characterized in that the ratio of the transport distance when the degree level value is exceeded is calculated, and if the calculated result is equal to or higher than a preset ratio, it is determined that the original film has optical fog. .

[0017]

( 2 ) The density of the original image film is measured while conveying the original image film in the longitudinal direction, and the film base density value is sequentially obtained based on the measured density of the original image film,
In film-based concentrated Dohaka constant process of updating the memory,
The film base density measuring method is characterized in that the position of the punch hole is detected based on the measured density and updating of the film base density value is prohibited at the position of the punch hole.

Here, the original image film is a developed film obtained by developing a photosensitive material after exposing it to light, and means a film such as a color negative film or a black and white negative film. A frame means a screen shot on an original film.

The optical sensor means a sensor for measuring the density of transmitted light or reflected light from the original film. Also,
The light fog means that the original image film is exposed to unnecessary light and has a predetermined density or more. Also, the inside of the shooting screen width range in the width direction of the original image film means the range inside the shooting screen width in the width direction of the original image film, and the outside of the shooting screen width range in the width direction of the original image film means the width direction of the original image film. Means the range outside the shooting screen width.

[0021]

[0022]

[0023]

[Operation] Here, the operation configured as described above will be explained.
Reveal According to claim 1 , while the original image film is being conveyed in the longitudinal direction, while detecting the conveying distance, the density is measured by the first optical sensor for measuring the density in the widthwise photographing screen range of the original image film, and The density is measured by the second optical sensor that measures the density outside the range of the widthwise photographing screen, and
The transport distance when the density measured by the first optical sensor exceeds a predetermined density level value is integrated, and the transport distance when the density measured by the second optical sensor exceeds a predetermined density level value is integrated. However, when any of the densities measured by the first optical sensor or the second optical sensor is below a predetermined density level value continuously for a preset distance or more, the first optical sensor measures. The ratio of the transport distance when the density measured by the second optical sensor exceeds the predetermined density level value to the transport distance when the density exceeds the predetermined density level value is calculated, and the calculation result is preset. If it is more than the ratio, it is determined that the original film has light fog. As a result, the light-fogged portion of the original film can be accurately detected.

[0024] In claim 2, the optical head detecting method according to claim 1, if there is an optical head, an optical head length from the tip of the original film, measured by the first light sensor or the second optical sensor It is determined that the state where any of the given densities is equal to or lower than the predetermined density level value is up to the first position of the position where the distance is continuous for the preset distance or more. As a result, the length of the light-fogged portion of the original film can be detected more accurately.

[0025]

According to a third aspect of the present invention , the density of the original film is measured while the original film is conveyed in the longitudinal direction, the film base density value is sequentially obtained based on the measured original film density, and the memory is updated. In step 1, the position of the punch hole is detected based on the measured density, and updating of the film base density value is prohibited at the position of the punch hole. As a result, the film base density of the original film can be accurately measured without being affected by the punch holes.

According to a fourth aspect of the present invention , in the film-based density measuring method according to the third aspect , the measured density is less than a preset value, and the change amount of the measured density is the preset change amount. The position of the punched hole portion is detected by virtue of the fact that the value exceeds. As a result, the punch holes can be detected more reliably, and the film base density of the original image film can be measured without being affected by the punch holes.

[0028]

Embodiments of the present invention will be described with reference to the drawings.

< Embodiment 1 > A method for detecting a frame position according to Embodiment 1 will be described with reference to FIGS.
It will be described based on. 1 is a schematic configuration diagram of a photographic printing apparatus to which the present invention is applied, FIG. 2 is a schematic configuration diagram of a printing unit in FIG. 1,
FIG. 3 is an electric circuit block diagram of the embodiment, FIG. 4 is an explanatory diagram of a frame position detecting method, and FIG. 5 is a flowchart of the embodiment.

As shown in FIG. 1, the photographic printing apparatus 10 automatically detects the frame position of the original image film 40 to detect the photographic printing paper 6.
This is a device for baking and developing to 0. The keyboard 15 can input customer information of the original film 40, the number of prints, and the like. In the illumination system, the light flux from the light source 13 is reflected by the mirror 1.
The original image film 40 is illuminated through the respective complementary color filters 26 of yellow Y, magenta M, and cyan C after being reflected at 4. The lens 12 forms an image of the original film on the photographic paper 60. The dark shutter 25 is an electric shutter. Further, the optical sensor 24 detects the densities of the three primary colors of the original film 40. The printing unit 20 is a portion for carrying the film 40, detecting the film carrying distance, measuring the film density, etc., and will be described later in detail. Tray section 18
Is a tray for collecting prints developed by the development processing section 16.

Now, the printing section 20 will be described in more detail with reference to FIG. 2. The film mask 21 is a screen mask for printing. By driving the step motor 23, the transport roller 22 around which the belt 27 is hung is driven to transport the original image film. The conveyance distance is detected by integrating the number of steps of the electric signal of the step motor 23 to calculate the conveyance distance. Further, the film density is measured by the optical sensor 32. The electric circuit block 30 is an electric block of the device and will be described in detail below.

Next, referring to FIGS. 1 and 2, the electric circuit block of FIG. 2 will be described with reference to FIGS. 1 and 2. The central control circuit B11 sequentially operates the photographic printing apparatus and controls each circuit described later. The film transport circuit B12 is a circuit that drives the step motor 23 that moves the original film 40 relatively to the position of the optical sensor 32, and the distance detection circuit B13 integrates the number of steps of the step signal of the step motor 23 to film the film. Is a circuit for detecting the transport length of the. The density measuring circuit B14 is a circuit for measuring the density of the original film 40. Clear edge coma detection circuit B1
Reference numeral 5 is a circuit for detecting a frame in which the edges of the photographic screen are clear, and more specifically, it is detected by the optical sensor 32 while the original image film 40 is being conveyed and a range exceeding a predetermined density continues for a predetermined distance. Circuit. In addition, the unclear edge frame stop circuit B16 is a position where an integer number of screen spacing pitches of the original film is returned after a frame with a clear edge position is detected, and a position where the frame edge position is unclear exists. It is a circuit that stops.

Next, FIG. 4 is a diagram used for explaining a frame position detecting method described later. In the original film 40 used in the description, the first frame 49 is a frame whose edge position is unclear, the second frame 50 is a blank frame, and the third frame 51 is a frame whose edge position is clear. FIG. 4A is a part of the printing unit in FIG. 2, and the same reference numerals are given to the same functions and the description thereof will be omitted. FIG. 4B is a state diagram in which the leading edge of the original image film 40 is located at the position of the optical sensor 32. Also, FIG.
(C) is the third frame 5 after the original film 40 has been transported.
A state diagram in which 1 is detected and an output waveform of the optical sensor 32 are shown.
The output waveform shows the output value of the optical sensor 32 on the vertical axis and the film distance on the horizontal axis. The leading edge position of the original image film 40 is detected when the output value of the optical sensor 32 becomes the base detection level value LB1 or less. Further, it is assumed that the detection of a frame whose edge position is clear is detected when the distance S that is equal to or less than the frame detection level value LB2 is within the predetermined range distance S ₀ .

FIG. 4D shows a state in which the third top 51 is conveyed and moved to the position of the film mask 21. Further, in FIG. 4E, the first frame 49 is 2 × P in the figure.
The state is shown in which (pitch) is conveyed and set at the position of the film mask 21.

Here, a method of detecting the frame position of the original image film of the embodiment will be described based on FIGS. 1 to 4 and further with reference to the flowchart of FIG.

First, the outline will be described.
Original film 4 while transporting 0 from the leading edge in the longitudinal direction
The transport distance of the original image film 40 is detected while measuring the density of 0, and the position (position A) that exceeds the first predetermined density level value LB2 from the leading edge of the original image film is stored, and the measured density of the original image film is the predetermined density. When the state in which the level value LB2 is exceeded continues for a predetermined predetermined range distance S _O , it is assumed that a frame 51 with a clear edge position is detected, and a distance that is an integral multiple of the frame pitch P from the position of the frame 51 with a clear edge position is detected. It is estimated that the returned position and the position including the position A are the positions of the first top 49.

More specifically, first, the original image film 40 is set in the printing section 20 and the original image film 40 is conveyed (flow F11). Original film 40 here
The output of the optical sensor 32 is the base detection level value LB at the tip of the
1 (see FIG. 4C) (flow F1)
2). Here, after the leading edge of the original image film 40 is detected, the integration of the number of steps of the step motor 23 is started to start the detection of the film transport distance (Flow F21).
Next, the state in which the predetermined density level value (frame detection level value LB2, see FIG. 4 (C)) is exceeded continues for a predetermined range distance S _O , thereby detecting the detection of a clear frame at the edge position of the original image film. (Flow F13, F14). If there is no frame with a clear edge position and detection is not possible, the film is conveyed for a certain distance and then returned to the beginning of the film 40 and stopped (flow F15, flow F18).
On the other hand, if a frame with a clear edge position can be detected (see FIG. 4C), the third frame 51 is once transported to the position of the film mask 21 (flow F16). Next, it is checked whether or not there is a first position (A position) below the predetermined density level value LB2 from the leading edge of the original film (flow F17). If there is no A position, the process ends here, but the A position is If there is (A of the first frame 49 in FIG. 4)
Position 47) A position that is an integer multiple of the screen interval pitch is calculated (flow F19), and the film 40 is returned to the frame position where the position A 47 is (flow F20). In the embodiment, the length of the frame is returned to twice the frame pitch P. It should be noted that, after the third frame 51 is detected, the frame 49 whose edge position is unclear may be directly conveyed to the position of the film mask 21. As described above, it is possible to accurately detect the position of a frame even if the frame edge is unclear.

< Embodiment 2 > An embodiment of a photographic printing apparatus to which a method for detecting light fog and a method for detecting a frame position in the presence of light fog are applied is shown in FIGS.
0 will be described. The schematic structure of the photographic printing apparatus is the same as that shown in FIG. FIG. 6 is a diagram showing the printing section and operation state of the photographic printing apparatus of the embodiment, FIGS. 7 and 8 are illustrations of the optical fogging state of the original image film, FIG. 9 is a main flow chart of the embodiment, and FIG. Each of the flowcharts is shown. The original film 40 described in the embodiment has a light-fog portion 43 at the leading end, the first frame 49 has an unclear edge position, the second frame 50 is an empty frame, and the third frame 51 is It is assumed that there is a frame with a clear edge position (see FIG. 6).

First, in FIG. 6A, the optical sensor 33 is a second optical sensor which measures the film density outside the width of the photographic screen in the width direction of the original film, and the optical sensor 34 is the first optical sensor which is the width direction of the film. To measure the film density within the width of the shooting screen.
Further, the optical sensor 32 is provided within the width of the photographing screen for detecting the frame position and measures the film density. Further, the step motor 23 drives the carry roller 22 in accordance with a signal from the electric circuit block 30 to carry the original film. For the film transport distance, the transport distance is measured by integrating the number of steps of the electric signal of the step motor 23. Electric circuit block 3
Reference numeral 0 denotes a circuit in which an optical fog detection circuit is added to the electric circuit block of FIG. 3, and the optical fog detection circuit is a circuit for detecting optical fog by a method described later based on electric signals from the optical sensors 33 and 32.

Next, FIGS. 6 (B) to 6 (E) are explanatory views of the detection of the frame position. FIG. 6 (B) shows that the optical fog end 43a of the optical fog unit 43 is located at the position of the optical sensors 33, 34. 6C shows the position where the trailing edge 46 of the third frame 51 is detected, and FIG. 6D shows the state where the third frame 51 is conveyed to the film mask 21. 6 (E) shows the first frame 49 as the film mask 2
1 shows the state in which the sheets are conveyed to No. 1.

Next, the detection of light fog at the leading edge of the original image film will be described with reference to FIGS. 7 and 8. In FIG. 7A, there is a light fog portion 43 at the position where there is no frame at the leading edge of the original image film 40. The leading edge portion 48 of the original image film 40 has a light fog in both the photographing screen width range 40A and the photographing screen width range 40B. Further, the optical sensor 33 has a range 4 outside the photographing screen.
0B is measured, and the optical sensor 34 is in the photographing screen width range 40A.
To measure. In the figure below, the optical sensor output value is shown, and the vertical axis indicates the optical fog detection level value LB of the optical sensors 33 and 34.
The cumulative value of the film distance exceeding 3 is shown, and the horizontal axis shows the length from the front end of the film. In the figure, the dotted line a indicates the integrated value of the optical sensor 33, and the solid line b indicates the integrated value of the optical sensor 34. In this case, the presence / absence of light fog is determined at the position M where the paper is conveyed a predetermined distance W in the figure. In the figure, let the integrated values up to the light fog end position N be V _{a and} V _{b ,} respectively.
The presence or absence of light fog is determined depending on whether the ratio of V _a / V _b is a predetermined value or more. In this case, it is determined that V _a / V _b is equal to or greater than a predetermined value, and that there is a light-fogged portion from the tip to point N. In addition, FIG.
In the case where there is a light fogging part 43 on the top frame 49, the following figure shows V _{a and} V _b values similar to those in FIG. _7A, and in this case also, it is judged that there is a light fogging.

Next, FIG. 8A shows the case where the bar code portion 45 is present in the photographing screen outside width range 40B of the original image film, for example, the lower diagram shows the optical sensor output value, and the vertical axis shows the optical sensor 33. , The integrated values V _{a and} V _{b of} the optical sensor 34 are shown. In the figure, the dotted line a indicates the integrated value of the optical sensor 34, and the solid line b indicates the integrated value of the optical sensor 32. in this case,
Since the ratio of V _a / V _b is less than the predetermined value, it is determined that there is no light fog. Further, FIG. 8B shows a state in which the light fog portion 43 and a splice tape mark 61 for connecting the film at the time of film development are overlapped with the leading end of the original image film 40. The lower diagram shows the integrated values V _{a and} V _b similar to those in FIG. Similarly, it is determined that the light fog is up to N points. It should be noted that if the distance that does not exceed the predetermined density of the trace of the step tape within the predetermined range is within a certain range on the dotted line b, it is not determined that the light fog has passed.

Here, the optical fog detection method and the frame position detection method in which the edge position is unclear when there is optical fog according to the embodiment will be described with reference to FIGS. 6 and 7 based on the main flowchart of FIG. 9 and the sub flow of FIG. This will be described with reference to the chart.

First, a method of detecting the approximate frame position of a frame in which the edge position is unclear when there is a light fog will be described. It is detected whether or not the leading end portion 48 of the original film 40 has a light fog and there is a light fog. If detected, original film 4
While transporting 0 in the longitudinal direction, the transport distance is detected while measuring the density of the original film 40, the measured density of the original film 40 exceeds a predetermined density level value (LB2), and the leading end portion 48 of the original film 40 is detected. The first position (position A) from the position where the light fog length advances from is stored, and when the measured density of the original film exceeds the predetermined density level value (LB2) for a predetermined transport distance, It is assumed that a frame (51) whose position is clear is detected, and the detected edge position is an integer multiple of the frame pitch P from the position of the clear frame,
The position including the position A is estimated to be the position of the first frame 49. Further, in the case where there is light fog, the light fog length is the predetermined density level value LB3 when the density measured by the first optical sensor 34 or the second optical sensor 33 is measured from the front end portion 48 of the original film 40. It is determined that the following state is up to the first light fog end 43a at a position continuous for the preset distance or more.

More specifically, the original film 4
0 is loaded into the printing unit 20, and the original film 40 is attached to the leading end 4
Transport from No. 8 (Flow F51). Next, the optical sensor 32
Checks the presence or absence of the original image film 40 on the basis of a predetermined base detection level value LB1 (LB1, see FIG. 4C), and if it can be detected that the original image film 40 exists, then the process proceeds to flow F53 (flow F52). . Next, the presence or absence of light fog is detected. The method of detecting light fog will be described later. Whether the optical sensor 33 or 34 has passed the light fog is determined by a predetermined distance W (see FIGS. 7 and 8).
During reference), the presence or absence of light fog is checked at a position exceeding the light fog detection level value LB3 (F54). here,
When the light is removed (F53), the step motor 23
The integration of the number of pulses is started to measure the film transport distance (Flow F59). Further, a frame having a clear edge position is detected by the optical sensor 32 by the same method as that in the first embodiment (flow F55). Here, it is checked by the same method as in Example 1 whether or not there is a frame 49 with an unclear edge position between the leading edge 48 of the original film 40 and the third frame 51. The optical fog end portion 43 which has conveyed the film 40 by a certain amount and passed through the optical fog
Return to a (Flow F56). Next, if there is a frame with an unclear edge position, the position of the frame with the unclear edge position (first frame 49) is determined by the same method as in the first embodiment (flow F57). Next, original film 4
The first frame 49 is moved to 0 to the position of the film mask 21 and stopped (flow F58).

Next, the outline of the detection of the light-fog portion will be described first. While the original image film 40 is being conveyed in the longitudinal direction, while detecting the conveying distance, the density within the widthwise photographing screen range of the original image film is detected. The density is measured by the first optical sensor 34 for measuring, and the density is measured by the second optical sensor 33 for measuring the density outside the widthwise photographing screen range of the original film. Then, the transport distance when the density measured by the first optical sensor 34 exceeds the predetermined density level value is integrated, and the density measured by the second optical sensor 33 is calculated by the predetermined density level value L.
The transport distance when exceeding B3 is integrated, and the state in which any of the densities measured by the first optical sensor 34 or the second optical sensor 33 is below a predetermined density level value continues for a preset distance or more. When the density measured by the first optical sensor 34 exceeds the predetermined density level value, the density measured by the second optical sensor 33 with respect to the transport distance when the density exceeds the predetermined density level value The ratio of the transport distance is calculated, and when the calculation result is equal to or more than the preset ratio, it is determined that the original film has light fog.

The method of detecting light fog will be described in more detail. The original image film 40 is conveyed to start the light fog detection mode (flow F31). First second
The optical sensor 33 (see FIG. 6) measures the density of, for example, the barcode portion of the original image film 40 outside the photographing screen width range 40B (flow F32). Here, if the density does not exceed the predetermined density, the candidate of the position that has passed through the light fog portion is stored (flow F33). On the other hand, the light fog detection level value LB3
If there is a portion that exceeds the distance, the film transport distance of the portion that exceeds the distance is integrated (Flow F34). Next, it is checked by the second optical sensor 33 and the first optical sensor 34 (see FIG. 6) whether or not the light fog detection level value LB3 is exceeded (flow F35). Here, if it exceeds LB3, the counter for counting the range without the light fog portion is reset (flow F37), and the light fog detection mode is set (flow F39). On the other hand, when there is no light fog less than LB3, the counter accumulates the distance within the range not exceeding the predetermined density of LB3 (Flow F36). further,
It is checked whether the set value of the counter is the distance W in FIG. 7 (A) (flow F38). When the distance W is equal to or less than the distance range, the mode for detecting the light fog remains (Flow F40). Further, when the distance is W or more, the light fog detection mode is stopped. After that, the total length of light fog in which the total length of the distance portion of the original image film 40 outside the photographing screen width range 40B exceeding the predetermined density level value LB3 of the bar code portion exceeds the predetermined density level value LB3 of the photographing screen width range. It is checked whether the ratio of the length is equal to or more than the setting (flow F41). If the ratio is less than the setting, it is determined that there is no light fog (flow F42). When the ratio of the light fog is equal to or more than the set value, it is determined that the light fog is present (flow F43).

As described above, even if there is a light fog portion 43 at the leading end of the original film 40 and there is a frame whose edge position is unclear, the frame can be positioned at the correct position on the film mask.

< Embodiment 3 > About the film base density measuring method of Embodiment 3 FIG.
From now on, it will be explained based on FIG.

FIG. 11A is a schematic configuration diagram of a film base density measurement main part of a photographic printing apparatus using the film base density measurement method, and FIG. 11B is an optical sensor output waveform diagram by the film base density measurement, FIG. 12 is a block diagram of the electric circuit of FIG. 11A, and FIG. 13 is a flow chart of the film-based density measurement of the embodiment.

Referring to FIG. 11A, the film density measuring apparatus will be described. The step motor 23 is rotated by the pulse signal from the electric circuit block 31, and the conveying roller is rotated by the step motor 23. Transport roller 2
When 2 rotates, the original image film 40 is conveyed. The original film 40 has a punched hole portion 44 at the tip for hanging. Further, the original film 40 is measured for density by the optical sensor 35 while being conveyed.

Next, the electric circuit block of the portion for measuring the film base density of the embodiment will be described with reference to FIG. The central control circuit B61 is a central control circuit that controls each circuit unit. The film transport circuit B62 is a transport circuit of the step motor 23 for transporting the original film 40 relative to the optical sensor 35, and the optical sensor circuit B63 is an optical sensor 35.
Is a circuit for measuring the density from the original film 40. The first determination circuit B64 is a circuit for comparing the value of the optical sensor 35 with the predetermined punch hole detection level value LB4, and the sensor change amount determination circuit B65 is for the amount of change of the value of the optical sensor 35 and a preset punch. This is a circuit that compares the detected change amount. The level value update prohibition circuit B66 is a circuit for prohibiting the update of the film base density value based on the first judgment circuit B64 and the sensor change amount judgment circuit B65. The second
The judgment circuit B67 is a circuit for comparing the new film base density value with the old film base density value. further,
The update canceling circuit B68 is a circuit for canceling prohibition of updating the film base density value of the optical sensor 35 .

Next, returning to FIG. 11B, the optical sensor output waveform for film density measurement will be described. The original image film 40 is conveyed and the optical sensor 35 detects the film density from the leading edge of the original image film 40. taking measurement. The measured sensor output is shown in the figure. In the figure, the vertical axis represents the sensor output value of the optical sensor 35, and the horizontal axis represents the length from the leading edge of the film 40. Also, in the figure, a, b, c, d, e, f, g
Indicates the measurement points of the optical sensor 35, and to obtain the film base density value based on the film density measurement, for example, at the position of the point b, the film base density value is obtained as the average value of the film densities at the points a and b. There is. The punched holes are detected by detecting that the density value is less than the predetermined density level value (LB4), and that the measured variation amount of the density value (the variation amount of the measurement points d and e in the figure) exceeds the preset density level value. It is detecting.

Here, a method of measuring the film base density of the embodiment will be described based on FIGS. 11 and 12 with reference to the flowchart of FIG.

First, the outline will be described.
The density of the original image film 40 is measured while 0 is conveyed in the longitudinal direction, the film base density value is sequentially obtained based on the measured density of the original image film 40, and the memory is updated. Further, the position of the punch hole portion is detected when the density measured based on the measured density is less than a preset value and the measured variation in density exceeds the preset variation. However, the updating of the film base density value is prohibited at the position of the punch hole portion 44 so that the measurement can be performed without being influenced by the punch hole.

More specifically, the original film 4
0 is loaded in the printing unit 20 and the original image film 40 is conveyed. Based on the optical sensor value of the optical sensor 35, the punch hole flag mode is turned on and off depending on the output change state according to the determination described later (flow F72). If the mode of the punch hole flag is turned off, it is checked whether the optical sensor value of the optical sensor 35 is smaller than a preset predetermined punch hole detection level value (predetermined density level value) LB4 (flow F73). When the optical sensor value of the sensor 35 is small, the initial film base density value is updated (flow F74). On the other hand, when the value of the optical sensor is larger than the predetermined punch hole detection level value LB4, the flow shifts to F77. Here, it is checked whether or not the amount of change in the optical sensor value of the optical sensor is smaller than the predetermined punch detection change amount CL (flow F77). If the amount of change in the optical sensor value is smaller than the predetermined punch detection change amount LC, the original film 40 The film base density value of is updated (flow F79). On the contrary, when the change amount of the optical sensor value is larger than the predetermined punch detection change amount LC set in advance, the film base density value is not updated and the old film base density value is maintained, and at the same time, the punch hole flag mode is set. To ON (Flow F7
8).

Here, based on the film base densities from the flows F74, F79, and F78, the tolerance amount, which is the threshold value of the optical sensor level for detecting the presence or absence of the frame of the original film 40, is calculated. The threshold value is obtained, for example, by multiplying the film base density value by a certain ratio (Flow F8).
0). Here, returning to the flow F72, when the punch hole flag is turned ON, it is checked whether the optical sensor value is smaller than the old film base density value (flow F75),
If it is smaller, it is considered that the punch hole portion 44 has been removed, and the punch hole flag mode is turned off. Then, it is assumed that the film base density value is equal to the old film base density value (flow F76). On the contrary, if it is large, it is assumed that the punch hole has been removed.

As described above, the film base density of the original image film can be measured without being affected by the punch holes.

[0059]

With the above-mentioned structure, the following effects can be obtained . Even if the frame of the edge position of the original image film is unclear, it is possible to accurately detect the frame position.

In the first invention, the light-fogged portion at the leading edge of the original image film can be detected.

Even if the leading edge of the original film has a light-fog portion, the frame position can be accurately detected even when the edge position of the frame is unclear.

In the second aspect of the invention, if there is a hanging punch hole provided at the leading edge of the original image film, the updating of the film base density value is prohibited, and it is canceled after passing through the punch hole. The film base density of a film can be measured without being affected by punch holes.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a photographic printing apparatus to which the present invention is applied.

FIG. 2 is a schematic configuration diagram of a printing unit in FIG.

FIG. 3 is an electric circuit block diagram of the embodiment.

FIG. 4 is an explanatory diagram of a frame position detection method.

FIG. 5 is a flowchart of an embodiment.

FIG. 6 is a diagram illustrating a printing unit and an operation state of the photo printing apparatus according to the embodiment.

FIG. 7 is an explanatory diagram of a light-fog state of the original image film.

FIG. 8 is an explanatory diagram of a light-fog state of the original image film.

FIG. 9 is a main flowchart of the embodiment.

FIG. 10 is a sub-flowchart of an embodiment.

FIG. 11 is a configuration diagram of a film base density measurement main part of a photographic printing apparatus using the film base density measurement method and an optical sensor output waveform diagram by the film density measurement.

FIG. 12 is a block diagram of an electric circuit of FIG.

FIG. 13 is a flowchart of film-based density measurement of an example.

[Explanation of symbols]

10 Photographic Printing Apparatus 12 Lens 13 Light Source 14 Mirror 15 Keyboard 16 Development Processing Section 18 Tray Section 20 Printing Section 21 Film Mask 22 Conveying Roller 23 Step Motor 24 Optical Sensor 25 Dark Shutter 26 Complementary Color Filter 27 Belt 30, 31 Electric Circuit Block 32, 35 Optical Sensor 33 Optical Sensor (Second Optical Sensor) 34 Optical Sensor (First Optical Sensor) 40 Original Image Film (Film) 40A Photographing Screen Width Range 40B Photographing Screen Width Range 43 Light Cover 43a Light Cover End 44 Punch Hole 45 Bar code 46 Rear edge 47 A position 48 Film front (front) 49 First frame (frame) 50 Second frame (frame) 51 Third frame (frame) 60 Printing paper 61 Splice Tape mark P Frame pitch LB1 Base detection level value (predetermined density level Bell value) LB2 Frame detection level value (predetermined density level value) LB3 Light fog detection level value (predetermined density level value) LB4 Predetermined punch hole detection level value (predetermined density level value) CL Predetermined punch hole detection change amount S Distance

Claims (4)

(57) [Claims] 1. The original film is conveyed in the longitudinal direction.
The width of the original image film while detecting the transport distance.
Measure the density with the 1st optical sensor that measures the density within the screen range
The density of the original film in the widthwise shooting screen range
Measuring the concentration with a second optical sensor for measuring
The density measured by the first optical sensor exceeds the specified density level value.
The accumulated transport distance is accumulated and measured by the second optical sensor.
The conveyance distance when the specified density exceeds the specified density level value
The integrated value is calculated by the first optical sensor or the second optical sensor.
One of the measured concentrations is below the specified concentration level value.
When a certain state continues for more than the preset distance,
The density measured by the first optical sensor is the predetermined density level.
Measured with the second optical sensor for the transport distance when it exceeds the value
Transport distance when the specified density exceeds the specified density level value
Calculate the separation rate, and the calculated result is less than the preset rate.
If it is above, it is determined that the original film has a light cast.
A method for detecting light fog characterized by the following. 2. When there is light fog, the light fog length is the original
From the leading edge of the image film, the first optical sensor or the first optical sensor
2 Any of the densities measured by the optical sensor is the specified density
The state below the level value continues for more than the preset distance.
Contracted to determine up to the first position
The optical fog detection method according to claim 1. 3. While conveying the original film in the longitudinal direction
The original film measured by measuring the density of the original film
The film base density value is sequentially calculated based on the density of
In the updated film-based density measurement method,
The position of the punch hole is detected based on the density
It is prohibited to update the base density value at the punch hole position.
And a film-based density measuring method characterized by: 4. The measured concentration is less than a preset value.
Yes, and the measured amount of change in concentration is
The position of the punch hole is detected by exceeding the
The film base according to claim 3, wherein
Concentration measurement method.