JP2511519B2 - Photo film frame position detector - Google Patents

Description

The present invention relates to a frame position detecting device for a photographic film, which is suitable for printing exposure, cutting a predetermined length of a photographic film, and the like.

[Conventional technology]

When a photographic film such as a developed negative film is stopped on the exposure stage or cut at a predetermined number of frames, it is necessary to detect the position of each frame. The position of each frame is conventionally detected based on data obtained by a sensor installed at a fixed distance in front of the exposure stage or the cutter.

[Problems to be Solved by the Invention]

However, according to the above-described conventional frame position detection method, the amount of data that can be used for frame position detection is obtained for only a few frames, so the edge position of a night scene frame, extreme under, and other negative frames is unclear. There is a problem in that it becomes impossible to detect the position of a frame when a number of continuous frames occur.

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and an object of the present invention is to provide a frame position detecting device for a photographic film, which can detect the frame position even when the frames having unclear edges continue.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a means for detecting the connecting end of a long photographic film in which a large number of photographic films are connected, a means for detecting the edge of each frame of the photographic film, and a connecting end. A means for obtaining edge position data of each frame for one order based on the part detection signal and the edge detection signal of each frame; and when the obtained edge position data includes an unclear edge, at least 1
And means for estimating the position of a frame whose edge is unclear based on the edge position data of one frame.

[Action]

When setting the photographic film on the exposure stage or cutting the photographic film at a predetermined number of frames, the edge of each frame of the photographic film is detected, and the order of one order is obtained based on the connection end detection signal and the edge detection signal. The edge position data of each frame is obtained. When there is a frame with an unclear edge in one order, the frame position is estimated based on the position data of the frame with a clear edge, and based on this, setting of the photographic film on the exposure stage, The photo film is cut for each predetermined number of frames.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a long negative film 12 in which a large number of negative films 10 are connected by a splice tape 11. In the negative film 12, the sensor portion 13 detects the splice tape 11 and the edge of each frame. The sensor unit 13 includes a pair of conveying rollers 14 and 15, a first tape sensor 18 that detects the splice tape 11 during the movement of the pair of conveying rollers 14 and 15, and an edge sensor 19 that detects the edge of each frame. Is provided.

The pair of conveying rollers 14 and 15 are rotated by a pulse motor 17 via a driver 16. The tape sensor 18 is configured by arranging three density detecting elements 18A to 18C at a predetermined pitch in the width direction of the negative film 12. In this way, the three density detecting elements 18A to 18C are provided in the negative film 12,
In addition to the splice tape 11, a repair tape or a check tape may be attached, so that these will not be erroneously detected. That is, since the repair tape and the check tape are shorter than the splice tape 11, 3
When all the density detecting elements 18A to 18C detect the tape, the detection signal of the splice tape 11 is obtained. Further, the edge sensor 19 is configured by arranging five density detecting elements 19A to 19E at a predetermined pitch in the width direction of the negative film 12 in order to reduce erroneous detection of the edge position. The density signals from the detection elements 18A to 18C and 19A to 19E are sent to the binarization circuit 20, converted into binary signals, and then stored in the buffer memory 21. The binarization circuit 20
A comparator 20A for each detection element is provided, and a reference voltage corresponding to a threshold is applied to this comparator 20A.

The tape detection data and the edge position data temporarily stored in the buffer memory 21 are taken into the data processing unit 28, where they are subjected to data processing to obtain edge position data for one order. The obtained edge position data for one order is stored in the data memory 29 via the controller 36 described later.

A reservoir 22 is provided on the film exit side of the sensor unit 13. The reservoir 22 is a film carrier that follows.
Before the negative film 12 reaches 27, a certain amount of the negative film 12 is stored to collect edge position data for one order. The reservoir 22 includes a pair of shipping rollers 15 and
The transport roller pair 23 is separated from the transport roller pair 15 by a predetermined distance, and these two transport roller pairs 1
The negative film 12 hangs down in a loop between 5 and 23 to store the film for a predetermined length.

A movable guide plate 26 is provided on the lower roller 15A of the entrance side transport roller pair 15. The movable guide plate 26 is in a horizontal state when passing the leading edge of the negative film 12, guides the leading edge to the pair of delivery rollers 23, and rotates downward after the tip is nipped by the pair of delivery rollers 23. Will be in the retracted state. The delivery side transport roller pair 23 is a film carrier described later.
It rotates in synchronization with the pair of transport rollers 31 and 32 of 27.

The negative film 12 stored in the reservoir 22 is a film carrier set on the exposure stage of the photo printing apparatus.
Sent to 27. The film carrier 27 has a second tape sensor 30 for detecting the splice tape 11 and a pair of conveying rollers 31, 32 for setting the negative film 12 at the exposure position.
Are provided. The pair of transport rollers 31 and 32 is the driver 3
It is rotated by the pulse motor 34 via 3. The signal output from the second tape sensor 30 is sent to the controller 36 via the binarizing circuit 35.

A cutter device 40 is provided on the film exit side of the film carrier 27. The cutter device 40 includes a second reservoir 41 and a cutter 42 that cuts the negative film 12 stored therein into a length of a predetermined number of frames. Second
Like the first reservoir 22, the reservoir 41 also includes two pairs of conveying rollers 44 and 45 and a movable guide plate 46.
The pair of conveyor rollers 44, 45 are connected to the pulse motor 48
Is rotated by. The cutter 42 is controlled by the controller 36 via the cutter driving unit 43. Further, in front of the cutter 42, a third tape sensor 49 having the same structure as the first tape sensor 18 is provided, and the signal from this sensor 49 is sent to the controller 36 via the binarizing circuit 50. Sent.

The controller 36 drives the conveying roller pairs 31, 32, 45 and the cutter 42 based on the one-order frame position data stored in the data memory 29 and the signals of the tape sensors 30, 49 to reach the exposure position. A set of each frame and a negative film
The disconnection is performed after every 12 predetermined frames.

 Next, the operation of this embodiment will be described.

First, the controller 36 sends the signals from the concentration detecting elements 18A to 18C and 19A to 19E of the sensors 18 and 19 to the pulse motor 17 respectively.
Sampling is performed for each order based on the drive pulse of. Then, the sampled density signal is converted into a binarization circuit.
It is sent to 20, where it is converted into a binary signal with a predetermined threshold value and then stored in the buffer memory 21.

Based on the signal stored in the memory 21, the controller 36 causes the data processing unit 28 to make the negative film 10 of one order.
The frame position data of each frame is calculated. First, the data processing unit 28, based on the data stored in the buffer memory 21,
First, the connection portion of the negative film 10 for each order is detected based on the signal obtained from the first tape sensor 18, and the order is identified by this. Further, the data processing unit 28 detects a rapid change in the density because the blank area between the frames is lower than the density in the frame, so that the negative film 10 for one order can be detected. Obtain edge position data for frames. At that time, as shown in FIG. 2, the signals of the five detection elements 19A to 19E are ANDed, and based on this AND signal,
The edge position of each frame F1 to F5 is detected. 2 shows an example of each frame F1 to F5 of an arbitrary portion of the negative film 10, a signal output from the binarization circuit 20 when each frame F1 to F5 is scanned by the sensor 19, and this signal. 4 schematically shows each processed signal when the is sequentially processed. And
In the figure, the edges of the frames F1 to F5 are shown by solid lines for clear edges and broken lines for unclear edges. Also, the one-dot chain line A1 in the figure
A5 to A5 indicate scanning lines of the density detecting elements 19A to 19E of the sensor 19.

As is clear from FIG. 2, five detection elements 19A-1
By taking the AND of the output signals of 9E, it is possible to clearly recognize the blank space S between the frames F1 to F5. That is, even if there is a low density area similar to the blank area S in the frame, these low density areas will not be erroneously detected as the blank area S by the AND signal.

It should be noted that in the third to left frame F3 in the figure from the center to the right side, a portion B having a low density such as a "pillar" is a negative film.
In the case where it extends over both edges in the width direction of 10, the portion B is detected by all the detection elements 19A to 19E, and therefore is also detected as a false blank portion in the AND signal. By the way, in the 135 type film, the size of the frame is either full or half. Therefore, of the blank portion S detected by the AND signal, the sum of the length "L1" of these full or half size frames and the length "L2" of the blank portion S between each frame is an integral multiple of "L1 + L2". The edge position data at the position is determined as the true edge position data, and other than that, it is determined as the false edge position data due to the "pillar" or the like in the frame scene. Therefore, even if an image having a density similar to that of the blank portion is recorded in the frame, the influence of this image can be eliminated.

The right edge of the second frame F2 from the left in FIG. 2 is obscured as can be seen from the signals of the detection elements 19A to 19E. Such a frame with unclear edges is often seen in the case of a night view image, an extremely under or over image, a stroboscopic image at night, a vertical stripe pattern image such as a pillar, or a Kabrinega film. As described above, in the case of a frame whose edge position is unclear, the data processing unit 28
Determines whether there is clear edge position data for at least one frame. When there is edge position data for one frame, position data of other frames whose edge positions are unclear are estimated with reference to the position data of a frame whose edge position is clear. That is, with a frame with a clear edge, for example, the edge position of F1 as a reference, the distance from this reference position is an integral multiple of the sum "L1 + L2" of the frame length "L1" and the margin portion length "L2". The position is presumed to be the edge position of a frame whose edge position is unclear.

The edge position data for one order thus obtained is stored in the data memory 29 for each order.
The controller 36 refers to the edge position data for each order in the data memory 29 and the negative film for one order.
Set each frame of 10 to the exposure position. First, the tape detection signal of the second tape sensor 30 detects the leading end of the negative film 10 of one order, and the film feed amount from the second tape sensor 30 is detected based on this leading end detection signal. This feed amount is performed by counting the number of drive pulses of the motor 34 of the pair of transport rollers 31. When the feed amount for the first frame is reached, the transfer of the negative film 12 is stopped, and the frame set to the exposure position is completed. In the same manner, the next frame is set at the exposure position, and each frame is sequentially printed and exposed.

When the data processing unit 28 determines that there is no frame with a clear edge, the controller 36 issues an alarm and switches to the manual set mode. Since the number of frames for one order can be known by obtaining the frame position data for one order, it is possible to use this frame number data for collation with the pre-verification result and collation with the print.
In addition, the frame position data also makes it possible to know whether the negative film for one order is full size or half size.

In the above-described embodiment, the alarm signal is issued when the edge position for one frame cannot be detected, but in this case as well, the full-size or half-size standard is added to the edge position data for one order. When all the parts with density are superposed in each frame of the standard edge position data, the position of each frame of the standard position data in the superposed state is adopted. Based on the above, each frame may be set at the exposure position or may be cut at a predetermined number of frames. Further, when it is detected from the edge position data that all the negative film for one order is unexposed or fog negative, it is possible to pass the film through the film carrier and cut it to a constant length by the cutter 42.

Further, in the above embodiment, the reservoirs 22 and 41 capable of storing one order of the negative film 12 were provided in front of the film carrier 27 and the cutter 42, but instead of this,
To collect the data, first send the negative film 12, and after returning the negative film 12 after collecting the data, set the negative film 12 to the exposure position of the film carrier 27 and cut it every predetermined number of frames. You may

〔The invention's effect〕

As described above, according to the present invention, even in a photographic film having a frame with unclear edges, it is set at the exposure position or every predetermined number of frames with reference to the edge position data of the frame with clear edges. Since it has been cut into pieces, it has been possible to automatically perform this, which has conventionally been done manually when there is a frame with an unclear edge.

[Brief description of drawings]

FIG. 1 is a schematic view showing a frame position detecting device for a photographic film embodying the present invention. FIG. 2 is an explanatory diagram showing an example of a negative film frame, a signal obtained by scanning the frame with a sensor, and a signal after processing this signal. 10 …… Negative film 11 …… Splice tape 12 …… Long negative film 13 …… Sensor 18,30,49 …… Tape sensor 19 …… Edge sensor 22,41 …… Reservoir 27 …… Film carrier 28 …… Data processing unit 36 …… Controller 42 …… Cutter.

Claims (1)

(57) [Claims] 1. A means for detecting a connecting end of a long photographic film in which a large number of order photographic films are connected, a means for detecting an edge of each frame of the photographic film, a connecting end detection signal and each frame. A means for obtaining edge position data of each frame for one order based on the edge detection signal, and based on the edge position data of at least one frame whose edge is clear when the obtained edge position data includes an unclear edge A frame position detecting device for a photographic film, comprising: means for estimating the position of a frame with an unclear edge.