JPH0331837A - Film picture plane position detector - Google Patents

Abstract

PURPOSE:To eliminate influence caused by the difference in film base densities by reading the DX code of a film, retrieving the base density of each film type based on this read DX code, and deciding a picture plane position based on this base density. CONSTITUTION:When a negative film 14 is inserted from the inlet of a film carrier, a film detecting sensor 41 detects the insertion of the film. A controller 50 fetches a signal from a DX code sensor 43 with this detected signal, and retrieves the base density of the film 14. The controller 50 carries the film 14 as well. By this carriage, each picture plane is scanned by a light receiving sensor 77, and a Dmax is extracted by a Dmax extracting part 88. This Dmax is read out from a RAM 53 by a comparator 89, and is binarized based on the obtained film density signal via a D/A converter 90. The controller 50 detects the edge of each picture plane with the binarization signal. Thus, each picture plane is positioned to a film watching window.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a film screen portion 1 detection device, and particularly to a film suitable for use when automatically setting each screen in an exposure window or a film observation window. The present invention relates to a screen position detection device.

[Conventional technology]

Automatic film carriers are used in printer processors, negative verification machines, and the like to automatically set each screen of the film at an exposure position or a negative verification position. These automatic film carriers include those that detect a notch formed on the edge of the film corresponding to the position of the film screen and automatically position the screen to the exposure position, etc., and others that detect each screen of the film using a screen detection sensor. There are some that detect and automatically position.

[Problem to be solved by the invention]

However, the method of detecting and positioning a notch has a problem in that it is necessary to provide a notch in the film in advance.

In addition, in devices that use a screen detection sensor to detect and position the edge position of the screen, the screen area is detected using the difference in density between the unexposed area (heath area) and the exposed area (screen area). However, the type of negative film (manufacturer, sensitivity)
Since the 5-base density differs depending on the image, there is a problem that it affects the accuracy of detecting the screen position.

The present invention is intended to solve the above problems, and aims to provide a film screen position detection device that improves screen position detection accuracy by eliminating the influence of differences in film base density. .

[Means to solve the problem]

In order to achieve the above object, the present invention includes an optical sensor that longitudinally scans a strip-shaped film recording a large number of screens;
means for storing film base density for each DX code of the film; and means for reading the DX code of the film;
means for retrieving the base density of the film from the storage means based on the read DX code; and screen position detection means for detecting the position of each screen of the film by comparing the retrieved base density with the density detected by the optical sensor. It has been established.

[Function] The base density of the film is stored in advance in the storage device for each type of film. Then, when the negative film is conveyed after being set on the film carrier, the DX code of the negative film is detected. Based on the detected DX code, the base density corresponding to the DX code is retrieved from the storage device. The screen position is detected from the density value measured by the optical sensor using this base density as a reference value, and thereby each screen can be automatically positioned in the exposure window and film observation window.

〔Example〕

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

In FIG. 1 showing the printer processor, numeral 10 indicates a film carrier. This film carrier 10 is set on a workbench 13 of a printer processor. As shown in FIGS. 1 and 2, the film carrier 10 includes:
A film observation window 11 and an exposure window 12 are provided. The exposure window 12 is provided so as to coincide with the exposure position when the film carrier IO is set on the workbench 13 of the printer processor. Further, the film observation window 11 is provided on the film entrance side with respect to the exposure window 12.

As shown in FIG. 1, below the film observation window 11 is a light source 15 built into the film carrier 10 for illuminating the negative film 14;
A diffusion plate 16 is arranged to diffuse light from the inside. Further, a light source section 17 of the printer processor is located below the exposure window 12, and a printing exposure section 18 of the printer processor is located above the exposure window 12. The color vapor 19 subjected to printing exposure in the printing exposure section 18 is developed in the processor section 20, cut frame by frame, and then discharged onto a tray 21.

Pairs of transport rollers 30 and 31 are arranged in the film observation window 11 and the exposure window 12 for setting each screen of the negative film 14 in each window. Each transport roller pair 30, 31 is rotated asynchronously by pulse motors 33, 34, respectively.

Each pulse motor 33, 34 is a driver 33A.

It is controlled by a controller 50, which will be described later, via 34A. Further, between each window 11 and 12, a loop forming stage 35 is provided which stores several hundred sides of the negative film 14 in a loop shape in order to perform film observation and printing exposure asynchronously.
is provided. As shown in FIGS. 1 and 2, the loop forming stage 35 is provided with a fixed guide plate 36A and a movable guide plate 36B for guiding the leading edge of the film to the exposure window side transport roller pair 31. As shown in FIG. 2, after guiding the leading edge of the film, the movable guide plate 36B is rotated upward by a motor (not shown) and retracted so as not to interfere with loop formation.

As shown in FIG. 1, on the film entrance side of each window 11, 12, there are screen detection sensors 37, 38 for detecting the edge position of each screen of the negative film 14, and
a film leading edge detection sensor 39 for detecting the leading edge of the film;
40 are arranged. In addition, at a position upstream of the pair of entrance transport rollers 30 on the film observation window side, there is a film detection sensor 41 for detecting that the leading edge of the film is inserted into the entrance side of the film carrier IO, and a film detection sensor 41 for detecting that the leading edge of the film is inserted into the entrance side of the film carrier IO, and a film detection sensor 41 for detecting the insertion of the leading edge of the film into the entrance side of the film carrier IO, and a film detection sensor 41 for detecting that the leading edge of the film has been inserted into the entrance side of the film carrier IO. A DX code sensor 43 for identifying the type is arranged. Furthermore, loop formation stage 3
A loop detection sensor 42 is arranged at 5 to detect that a predetermined loop amount has been reached.

The output signals from each of these sensors are sent to the controller 50, where the screen position is determined.

Based on the result of this determination, the controller 50 controls each pulse motor 33, 34 to automatically position each screen of the film 14 at the correct angle 11° 12.

As shown in FIG. 3, the controller 50 is composed of a well-known microcomputer, and is automatically controlled by the CPU 54 based on the control program stored in the ROM 52, various data stored in the RAM 53, and output signals from each sensor. In addition to performing feed control, as shown in FIG. 1, it also controls various mechanisms such as the light quality adjustment section 55 and shutter drive section 56 of the printer processor. For this reason, a keyboard 57 is provided for controlling frame advance and various mechanisms. As shown in FIG. 1, the keyboard 57 includes alphanumeric keys 58 for setting various modes and inputting set values, and correction keys 59 for inputting negative test results. A frame advance key 60 for advancing frames, a fine adjustment key 61 for finely adjusting frame positions,
A start key 62 and the like are provided. In addition, numerals 63 and 64 in FIG. 3 are I10 boats, and each boat 63 and 64 are I10 boats.
．． Each sensor and pulse motor are connected to 64.

In a predetermined area of the RAM 53, the base density of the film is written for each type (manufacturer, sensitivity) of the negative film 14. An example of this search table 65 is shown in FIG. The base density of this search table 65 can be written by setting the controller 50 to the base density setting mode. For example, in this mode, the screen detection sensor 37 measures the density of the negative film 14, finds the minimum value among these measured values, and uses this as the base density for DX.
It is written into the RAM 53 in correspondence with the code.

During screen detection, it is possible to find the minimum density for each film type, update this density as appropriate, and write the latest one, or find the minimum density for one film, and then select multiple films of the same type. The average value of the book film may be calculated and this may be used as the base density.

The signal output from the DX code sensor 43 is decoded by the controller 50. Then, the controller 50 stores the RAM 53 based on the read DX code.
, and obtain the corresponding base concentration. This DX code reading and base density search are performed every time the film detection sensor 41 detects a film.

In addition, the negative film 1 of each order is attached with splice tape.
4, the splice tape is detected by a tape detection sensor (not shown), and the DX code is read and the base density is searched every time the splice tape is detected.

FIG. 5 shows the screen detection sensor 37 disassembled and viewed from below. Note that the screen detection sensor 38 disposed on the exposure window side is also configured similarly to the screen detection sensor 37 on the film observation window side. A light projecting section including a cold cathode tube 72 is arranged below the negative film 14 transport path. The light from the cold cathode tube 72 passes through the slit 75 of the slit plate 74 and illuminates the negative film 14 from below.

The slit plate 74 is attached to the opening A of the mounting plate 76 from above. The light transmitted through the negative film 14 is measured by a light receiving sensor 77. The light receiving sensor 77 is I
2 m in the width direction of the negative film 14 on the back side of the C substrate 81
A glass plate 83 on which five light receiving sections 82A to 82E are arranged in a row at an interval of 1 is bonded to the glass plate 83. Note that the central light receiving section 82
It is also possible to arrange one light-receiving section in parallel with respect to C at an interval of one space in the film feeding direction, and use this as the film leading edge detection sensor 39. The light receiving sections 82A to 82E are made up of 41 well-known amorphous silicon photosensors.

Since an amorphous film can be formed into a uniform and large-area film on a glass plate or the like, the light-receiving parts 82A to 82E can be arranged in strips at a predetermined pitch as in this embodiment.

Each of the light receiving sections 82A to 82E is formed in a rectangular shape elongated in the width direction of the negative film 14. Each light receiving section 82A-8
When detecting each screen 14A of a 135 type negative film 14, the length of the film 2E is about 2.4 m, and the width is about 0.2+am. These light receiving parts 82A
The band-shaped scanning line La-Le on the negative film 14 by ~82E is shown in FIG. 5 and FIG. 6, which will be described later.
The width of the light receiving portions 82A to 82E is not limited to the above numerical values, but is preferably selected within the range of 0.1 to 0.5 mm.
Although E is set to five, this can be increased or decreased as appropriate.

This increase/decrease range is preferably in the range of 4 to 10, but is not limited thereto.

Also, on the IC board 81, there is a preamplifier shown in FIG.
An IV conversion circuit 84 is formed.

This preamplifier/IV conversion circuit 84 includes each light receiving section 82.
The weak current signals photoelectrically converted in A to 82E are amplified and then converted into voltage signals. The substrate 81 has an opening 8 in the mounting plate 85.
6 from above, thereby fitting the glass plate 83 into the opening 86.

As shown in FIG. 3, the preamplifier/I-Vifi circuit 8
The voltage signal from 4 is logarithmically converted into a density signal by a logarithmic converter 87, and then sent to a DHax extractor 88, where the maximum density value DMaχ is extracted for screen detection. That is, in the DMax extraction section 88, each light receiving section 82
The maximum value of the concentration signals Da-DeO from A to 82E is extracted and sent to the child terminal of the comparator 89 as DMax.

A reference signal Dref corresponding to the base density of the film obtained by the search as described above is inputted to one terminal of the comparator 89 via the D/A converter 90, and the comparator 89 has: (7) IJ 7 Allens Signal D
The D Max signal is binarized based on ref. Note that it is preferable to use a value several percent larger than the base concentration signal obtained by searching for Dref.
A minimum value extraction unit 91 is connected to the aχ extraction unit 88 . As described above, this minimum value extraction section 91 operates in the base density setting mode or the base density update mode to obtain the minimum density value of the negative film 14 and convert it into an A/
It is output to the controller 50 via the D converter 92.

FIG. 6 shows an example of the density signals D a - D e obtained when the negative film 14 and each screen 14A thereof are scanned by the light receiving sections 82A to B2E, and the DMax and comparator outputs extracted from these signals. In this way, the position of each screen can be determined based on the output of the comparator 89 based on the base density of the film. In this way, since the screen portion position is determined based on the base density, the screen position can be detected with the same detection accuracy even for other types of films with different base densities.

Positioning of each screen 14A to the film observation window 11 is performed as follows. First, the leading edge of the negative film 14 is detected by the film leading edge detection sensor 39, and from the time of this detection, the film feed amount is controlled by driving the pulse motor 33, for example. Detected by counting the number of pulses. Then, based on the edge signal output from the comparator 89, the edge position of each screen 14A of the negative film 14 is stored as feed amount data from the leading edge, and the negative film 14 is transferred based on this feed amount data. Each screen 14A is positioned in the film observation window 11. Note that each screen 14A of the negative film 14 is positioned in the exposure window 12 in the same manner.

Next, the operation of this embodiment will be explained with reference to FIG.

When the negative film 14 is inserted from the entrance side of the film carrier 10 and its leading end is brought into contact with the nip portion of the entry side transport roller pair 3o, the film detection sensor 41 detects the insertion of the film. In response to this detection signal, the controller 50
The signal from the X code sensor 43 is taken in and decoded to search for the base density of the negative film 14. Further, the film detection signal is made into a frame advance signal and is sent to the controller 50. The controller 50 rotates the transport roller pair 30 based on this detection signal to transport the film 14.

Through this conveyance, each screen 14A of the film 14 is scanned by the light receiving sensor 77 of the screen detection sensor 37, and after being converted into a density signal by the logarithmic conversion section 87, the D Max extraction section 8
At step 8, DMax is extracted, and this D Max is extracted by a comparator 89 using the film density signal Dref as a reference.
Valued. The controller 50 detects the edge position of each screen 14A based on this binary signal, and thereby positions each screen 14A in the film observation window 11. After the positioning is completed, the operator observes the screen, performs a negative verification, and inputs the amount of correction for density and color balance using the correction key 59. This negative verification result is stored in the RAM 53 for each screen, and later read out when this screen is positioned in the exposure window 12. ) The exposure amount is determined based on the photometry results.

The film 14 that has been negative verified as described above is stored in a predetermined loop amount at the loop forming stage 35, and then sent to the exposure window 12, and similarly, the film 14 is sent to the screen detection sensor 38.
The edge position is detected by the signal, and each screen is positioned in the exposure window 12 based on this. Photometry is performed with a scanner for the screen that is positioned at 0, and based on this photometry result and the negative verification result. Then, printing exposure is performed. When the printing exposure is completed and a new unexposed color paper 19 is set at the exposure position, the controller 1-roller 50 outputs a frame advance signal. Then, based on the loop amount, the frame feed signal, and the screen detection signal, the exposure window 12 is sequentially
Set each screen to . The printed and exposed color paper 19 is sent to a processor section 20, where it is developed.

In the above embodiment, the signals from the screen detection sensors 37 and 38 are binarized based on the base density of the film to detect the screen position. It is also possible to perform even more accurate screen position detection by taking .

4゜Also, in the above embodiment, the screen detection process is performed after converting to a density signal, but in this case, the above process is performed without logarithmically converting the voltage signal corresponding to the image density of the film. You can also do that. Further, in the above embodiment, the comparator 89 performs binarization using hardware,
This is done using the controller for screen detection processing, but this can also be done using software within the controller.

〔Effect of the invention〕

As explained above, according to the present invention, the DX of the film
The code is read, the base density of each film type is searched based on this, and the screen position is determined based on this base density, so even if other types of films with different base densities are used, the same detection accuracy can be achieved. The screen position can be detected.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a printer processor implementing a film screen position detection device according to the present invention. FIG. 2 is a perspective view showing the overall appearance of the film carrier in the same embodiment. FIG. 3 is a block diagram showing a function of detecting the screen based on signals from the light receiving sensor and the DX code sensor. FIG. 4 is an explanatory diagram showing an example of a search table stored in the RAM of the controller. FIG. 5 is an exploded perspective view of the screen detection sensor. FIG. 6 is an explanatory diagram showing a negative film, signals from each light receiving section when both sides of the film are scanned, and characteristic values extracted from these signals. 10 ・ ・ ・ 11 ・ ・ ・ 12 ・ ・ ・ 14 ・ ・ 14A ・ ・ 14B ・ ・ Film carrier Film observation window Exposure window Negative film/screen/margin 30. 31...Transport roller pair 35...Loop formation Stages 37, 38... Screen detection sensor 39, 40... Film leading edge detection sensor 41... Film detection sensor 43... DX code sensor 50... Controller. Procedural amendment May 9, 1990 1999 Patent layer No. 167406 2, Title of invention Film screen position detection device 3, Relationship with the person making the amendment Patent applicant address 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture Name (520
) Fuji Photo Film Co., Ltd. 4, Agent @ 170 3rd floor, Taiyo Seimei Daibutsu Building, 2-25-1 Kita-Otsuka, Toshima-ku, Tokyo 'ff (917) 1917 "Detailed Description of the Invention" of the Specification Subject to Amendment Column. "Large area" in the last line of page 10 of the drawing correction description of contents is corrected to "minor area." (2) Correct FIG. 5 of the drawings as shown in the attached sheet (correction of the orientation of the cold cathode tube 72 in the figure). that's all

Claims (1)

[Claims] (1) An optical sensor that scans a strip of film recording a large number of screens in the longitudinal direction, a means for storing the density of the film base for each type of film, a means for reading the DX code of the film, and a means for reading the DX code. It is characterized by comprising means for retrieving the base density of the film from the storage means, and screen position detection means for detecting the position of each screen of the film by comparing the retrieved base density with the density detected by the optical sensor. Film screen position detection device.