JPH07244311A - Abnormal conveyance detecting device for film scanner - Google Patents

Abstract

PURPOSE:To more surely evade the damage of a film and equipment by detecting the abnormal conveyance of the film at the interval of a perforation or below so as not to apply an abnormal load to the film. CONSTITUTION:Each rotational speed of a roller 34 moving the film 40 at a prescribed speed and a roller 35 moved following the movement of the film 40 is detected by encoders 32, 34, etc. Moreover, the perforation 40A of the film 40 is detected by a perforation sensor 36. Further, the driving current of a motor 26 driving the roller 34 is detected by a current detector 52. Thus, the abnormality of the carrying state of the film can be detected based on changes in the rotational speed of the roller 34, the driving current of the motor 26, the rotational amount of the roller 34 at the detection interval of the perforation, the rotational speed of a rotor 35, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting abnormal conveyance of a film scanner, and more particularly, it is applied to a film scanner which conveys a developed photographic film at a predetermined speed and reads a film image by a line sensor during the conveyance. The present invention relates to an abnormal conveyance detection device for a film scanner.

[0002]

2. Description of the Related Art Conventionally, a device for detecting abnormal conveyance of a film has been applied to an automatic winding device for a camera, for example, there is one disclosed in Japanese Patent Laid-Open No. 58-196532. The camera described in JP-A-58-196532 uses a film in which perforations are provided at regular intervals corresponding to each frame, and a motor for feeding the film is detected based on the detection of the perforations of the film. One frame is sent by starting / stopping,
When the perforation detection interval exceeds a certain time interval, it is determined to be abnormal.

[0003]

However, the above-mentioned conventional abnormal film conveyance detecting device is applied to an automatic winding device of a camera, and conveys a developed photographic film at a predetermined speed and conveys it. It cannot be applied to a film scanner that reads a film image by a line sensor.

That is, in the case of a film scanner, the film must be conveyed at a constant speed during image reading, and if the film conveying speed fluctuates, a good image cannot be read. Also, if it takes time from when an abnormality occurs in the film conveyance to when the abnormality is detected, the film may buckle and be damaged.In particular, since the film scanner uses the film after shooting, it is repaired once it is damaged. Since it is virtually impossible, ensuring the safety of the film is very important.

Therefore, in the case of a film scanner, it is necessary to detect an abnormal conveyance even if there is a slight speed change during the conveyance of the film.
In the camera disclosed in the publication, when it takes about 1 second to feed one frame, the perforation detection interval provided for each frame has a predetermined time (for example, 3
If it exceeds 2 seconds, it is judged as abnormal.

When the abnormal conveyance is detected in this way, the film may be damaged at the time when the abnormal conveyance is detected. For example, if an abnormality occurs immediately after the start of frame feeding, then at least 1
The film is transported for each frame. Also, if the perforation detection fails, correct abnormality detection cannot be performed.

The present invention has been made in view of the above circumstances, and it is possible to detect an abnormal conveyance of a film within the interval of perforation and prevent an abnormal load from being applied to the film. It is an object of the present invention to provide an abnormal conveyance detection device for a film scanner that can more surely avoid damage to the film or equipment.

[0008]

In order to achieve the above-mentioned object, the present invention conveys a developed photographic film at a predetermined speed by a roller to which a rotational driving force from a motor is transmitted, and an image of the film is conveyed. Is a device for preventing abnormal conveyance of a film scanner that reads a line sensor, wherein a speed detection unit that detects the rotation speed of the roller, and a conveyance state of the film based on a change in the rotation speed detected by the speed detection unit. An abnormality detecting means for detecting an abnormality is provided.

Further, according to the present invention, a developed photographic film having perforations formed at regular intervals is conveyed at a predetermined speed by a roller to which a rotational driving force from a motor is transmitted, and an image of the film is lined. A device for detecting an abnormal conveyance of a film scanner which is read by a sensor, wherein the clutch is arranged between the motor and the roller and slips when a rotational driving force exceeding a predetermined torque required for normal film conveyance is applied. An encoder that includes a rotating member that rotates integrally with the roller, that outputs a pulse signal of a number proportional to the rotation speed of the rotating member; a perforation detecting unit that detects perforation of the film; and a perforation detecting unit. Next perforation after a perforation A counter that counts the number of pulse signals output from the encoder until it is detected, and the transfer of the film by comparing the count value of the counter with a reference count value corresponding to the speed at which the film should be transferred. And an abnormality detecting means for detecting an abnormality of the state.

Further, according to the present invention, when a film cartridge in which a developed photographic film is wound around a uniaxial spool is mounted, the spool of the film cartridge is driven to move the leader portion of the film to the first position. 1
Send it to the position where the roller of
In a device for preventing abnormal conveyance of a film scanner, which conveys the film at a predetermined speed by the first roller and reads an image of the film with a line sensor, a second roller that comes into contact with the film and rotates according to the movement of the film. An encoder that includes a roller and a rotating member that rotates integrally with the second roller, that outputs a number of pulse signals proportional to the rotational speed of the rotating member, and the period of the pulse signal that is output from the encoder. And an abnormality detection unit that detects when the period of the pulse signal measured by the measurement unit exceeds a reference period corresponding to a predetermined speed of the film as an abnormality. . Further, a timer for measuring the time from the driving start time of the spool for feeding the film from the film cartridge, and an abnormality detecting means for detecting an abnormality when the film or perforation is not detected within a predetermined measurement time by the timer. And are equipped with. Further, it is arranged on the upstream side of the second roller and detects the film or the perforation of the film, and measures the time from the time when the detecting means first detects the film or the perforation. A timer and an anomaly detecting means for detecting as an anomaly when the encoder does not output a pulse signal within a predetermined measurement time by the timer.

Furthermore, according to the present invention, when a film cartridge in which a developed photographic film is wound around a uniaxial spool is mounted, the spool of the film cartridge is driven to move the leader portion of the film. The film is fed to the position where the rollers are arranged, and then the film is conveyed by the roller at a predetermined speed and the film is wound by a take-up shaft, and an image of the film being conveyed at the predetermined speed is lined up. A device for detecting an abnormal conveyance of a film scanner, which is read by a sensor, wherein the take-up shaft having the same diameter as the spool of the film cartridge, and the rotation speeds for detecting the rotation speeds of the spool and the take-up shaft of the film cartridge, respectively. The rotation speed detected by the detection means and the rotation speed detection means is When deviating from a preset first speed range based on a predetermined speed and a minimum and maximum diameter of the winding shaft, and / or an average value or a total value of the rotation speeds is a predetermined speed of the film, An abnormality detecting unit that detects an abnormality when the winding speed deviates from a preset second speed range based on the minimum and maximum diameters of the winding shaft. Further, based on each detection signal of a plurality of sensors used in the film scanner, a detection unit that detects a time interval of each detection signal during a period in which the film is conveyed at a predetermined speed, and At least one of the time intervals detected by the detection means exceeds a predetermined allowable range with respect to the time interval of the detection signal of each sensor obtained when the film is normally conveyed at a predetermined speed. And an abnormality detecting means for detecting an abnormality.

[0012]

According to the present invention, the speed detecting means for detecting the rotational speed of the roller for moving the film at a predetermined speed is provided. Since the change in the rotational speed of the roller detected by the speed detecting means corresponds to the change in the speed of the film to be conveyed at a predetermined speed, the change of the rotational speed of the film is detected based on the change in the rotational speed detected by the speed detecting means. It is possible to detect an abnormality in the transportation state.

According to another aspect of the present invention, a clutch is provided between the motor for driving the roller and the roller, which slips when a rotational driving force exceeding a predetermined torque required for normal film conveyance is applied. An encoder that includes a rotating member that rotates integrally with the roller and that outputs a number of pulse signals proportional to the rotation speed of the rotating member;
A perforation detecting means for detecting the perforation of the film is provided, and the pulse signal output from the encoder is counted at the detection intervals of the perforations detected by the perforation detecting means, and the count value and the speed at which the film should be conveyed. By comparing with the reference count value corresponding to, the abnormality of the transport state of the film is detected.

According to still another aspect of the present invention, in addition to the first roller for transporting the film at a predetermined speed, a second roller which rotates according to the movement of the film is provided and the second roller is provided. An encoder that includes a rotating member that rotates integrally with the roller and that outputs a number of pulse signals proportional to the rotation speed of the rotating member is provided. When the cycle of the pulse signal output from the encoder exceeds the reference cycle, It is detected as an abnormality. Further, the time from the driving start time of the spool for feeding the film from the film cartridge is measured, and the case where the film or perforation is not detected within a predetermined measurement time is detected as an abnormality. Further, a detecting means for detecting a film or perforation is provided on the upstream side of the second roller, and the encoder does not output a pulse signal within a predetermined time from the time when the detecting means first detects the film or perforation. The case is detected as abnormal.

According to another aspect of the present invention, a winding shaft having the same diameter as the spool of the film cartridge is provided, and rotation speed detecting means for detecting the rotation speeds of the spool and the winding shaft are provided, Each rotation speed detected by the rotation speed detection means deviates from a predetermined speed of the film, a first speed range preset based on the minimum and maximum diameters of the winding shaft, or each rotation speed. When the average value or the total value of the speeds deviates from the second speed range preset based on the predetermined speed of the film and the minimum and maximum diameters of the winding shaft, it is detected as an abnormality. . Further, based on the detection signals of a plurality of sensors used in the film scanner, the time intervals of the detection signals during the period in which the film is conveyed at a predetermined speed are respectively detected, and the film is predetermined. When at least one of the time intervals of the detection signals of the respective sensors obtained when the sheet is normally conveyed at the speed of 5 exceeds a predetermined allowable range, it is detected as an abnormality.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an abnormal conveyance detecting device for a film scanner according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a film scanner including an abnormal conveyance detection device for a film scanner according to the present invention.

As shown in the figure, this film scanner is mainly used for illumination of a fluorescent lamp 10, a photographing lens 12 and a lens C.
A CD line sensor 14, a memory controller 20, an image memory 22, a film driving mechanism including a motor 26, encoders 32 and 35, a perforation sensor 36, a central processing unit (CPU) 44, and the like are provided. Developed photographic film 40 used in this film scanner
For example, perforations 40A are perforated at regular intervals so that they can all be wound up in a film cartridge 42 having a uniaxial spool 42A.

When the film cartridge 42 is mounted on the film scanner, the spool 42A of the film cartridge 42 is fitted with a supply reel stand (not shown). When the film loading is started, the spool 42A is driven in the clockwise direction (CW direction),
As a result, the film cartridge 42 to the film 40
Is sent out. When the film loading is started, the motor 26 is driven and the rotational driving force is transmitted to the roller 34 via the clutch 28. The roller 34 is in contact with the film 40 and conveys the film 40 at a predetermined speed. When the film is loaded or the film 40 is conveyed in the forward direction (the direction of arrow A), the roller 34 rotates in the CW direction. To be made.

When it is detected by a film sensor or the like (not shown) that the leader portion of the film 40 has reached the position of the roller 34 during film loading, the spool 4
The drive of 2A is stopped, and thereafter, the film 40 is conveyed by the roller 34, and is wound around the winding shaft 38A of the winding reel 38 via the roller 36. The take-up reel 38 can be driven by a motor (not shown).

The CPU 44 outputs a motor control signal to the motor driver 46, and controls the forward / reverse rotation of the motor 26, starting / braking, and pulse width modulation to control the film transport speed through the motor driver 46. Will be described later. The fluorescent lamp 10 is arranged such that its longitudinal direction is orthogonal to the feeding direction of the film 40, and can illuminate the entire width of the film 40. The transmitted light transmitted through the film 40 is imaged on the light-receiving surface of the CCD line sensor 14 arranged in the direction orthogonal to the film feeding direction via the single-focus photographing lens 12. The image light imaged on the light receiving surface of the CCD line sensor 14 is accumulated in charge by the respective sensors provided with R, G, B filters, and signals of R, G, B in an amount corresponding to the intensity of the light. Converted to electric charge. R, G, accumulated in this way
The signal charge of B is read to the shift register by a transfer gate pulse applied from a CCD driving circuit (not shown), and sequentially read by a register transfer pulse.

The R, G, B signals read from the CCD line sensor 14 at the time of reading the film image are clamped by the CDS clamp and added to the amplifier / analog processing circuit 16, where the gain and the like are controlled. The R, G, B signals for one frame output from the amplifier / analog processing circuit 16 are converted into digital signals by the A / D converter 18, and then stored in the image memory 22 via the memory controller 20.

The R, G, B signals for one frame stored in the image memory 22 are repeatedly read by the memory controller 20 and converted into analog signals by the D / A converter 24, and then by the encoder 25. It is converted into an NTSC composite video signal and output to the monitor TV. As a result, the film image can be viewed on the monitor TV.

Next, an abnormal conveyance detecting device for a film scanner according to the present invention will be described. First, a case where the motor current is monitored to detect abnormal conveyance will be described. A drive current is applied to the motor 26 from the motor power source 50 via the current detector 52 and the motor driver 46.
The drive current is detected by the current detector 52, and A /
After being converted into a digital signal by the D converter 54, it is applied to the CPU 44 as a motor current value signal.

The CPU 44 outputs a motor control signal to the motor driver 46 and starts / brakes the motor 26 through the motor driver 46 (see FIG. 2 (A)). A motor current value signal as shown in 2 (B) is input. On the other hand, when an overload is applied to the motor 26 due to an abnormality in the film transport, the current applied to the motor 26 becomes higher than the steady-state current value at the normal time. Therefore, as shown in FIG. 2C, a threshold Th that is slightly higher than the steady-state current value in the normal state is set, and when the motor current value signal reaches the threshold Th, it is regarded as an overload and an emergency stop is performed.

As shown in FIG. 2C, since a current exceeding the threshold value Th may flow during a predetermined time T from the start of the motor, the abnormality detection is not performed during the predetermined time T. To do so. The threshold value Th is set in advance according to the operation state of the device at that time (for example, during feeding during image reading, during fast forward, during rewinding, etc.), and further, during operation of the clutch 28 described later, an abnormality due to the motor current described above It is effective to perform detection. According to this method, abnormal conveyance can be detected in real time.

A clutch 28 is arranged between the motor 26 and the roller 34. This clutch 28
Is a felt clutch, for example, and is configured to slip when a torque that is slightly larger than the torque applied from the motor 26 during normal film transport (including starting / braking) is applied. Therefore, when an abnormality occurs in the conveyance of the film and the conveyance load becomes large, the clutch 28 is prevented from slipping and the film 40 is forcibly sent out, so that the damage to the film can be prevented.

Next, the case where abnormal conveyance is detected from the motor rotation speed signal will be described. The slit disk 3 of the encoder 30 is provided between the clutch 28 and the roller 34.
0A is provided, and the slit of the slit disk 30A is detected by the photodetector 30B and output as a pulse signal. Therefore, this encoder 30
Outputs a pulse signal having a frequency proportional to the rotation speed of the roller 34 (film transport speed). The pulse signals output from the encoder 30 are output to the counter 5 respectively.
6 and 58.

A sampling signal of a constant cycle is added from the CPU 44 to the counter 56, and the counter 56
The pulse signal input from the encoder 30 is counted for each cycle of the sampling signal, and the count value is output to the CPU 44 each time the sampling signal is input as a motor rotation speed signal. The CPU 44 controls through the motor driver 46 such that the rotation speed of the motor 26 becomes the set rotation speed based on the motor rotation speed signal input from the counter 56, and abnormal conveyance of the film is also performed based on this motor rotation speed signal. To detect.

That is, during normal film transport,
A large speed change does not occur except at the time of starting / braking the motor 26 or changing the conveying speed, and the motor rotation speed is within a predetermined fluctuation range as shown in FIG. Therefore, as shown in FIG. 3 (B), the upper limit value Th ₁ and the lower limit value Th ₂ are set with a slight margin in the fluctuation range, and the motor rotation speed is changed from the upper limit value Th ₁ to the lower limit value Th ₂ . If it exceeds the range, it is considered that some abnormal load has occurred.

Next, the case where abnormal conveyance is detected from the perforation detection interval will be described. The perforation sensor 36 is arranged in the vicinity of the film cartridge 42, and the perforation detection signal of the H level or the L level is output from the waveform shaping circuit 57 depending on the presence or absence of the perforation 40A formed in the film 40.
It outputs to the counter 58 via (refer FIG.4 (B) or (C)).

A pulse signal (FIG. 4A) from the encoder 30 is added to the clock input of the counter 58, and the counter 58 is input during one period of the perforation detection signal (perforation detection interval). The pulse signals to be counted are counted, and the count value is output to the comparator 59. The other input of the comparator 59 is the CPU 4
4, the reference count value corresponding to the perforation interval is added, and when the count value from the counter 58 becomes equal to or larger than the reference count value, the comparator 59 regards it as an abnormality in film transport and outputs an abnormality detection signal to the CPU 44. That is, in the embodiment shown in FIG. 4, it is assumed that about 10 pulse signals are output from the encoder 30 during normal operation during one perforation cycle, and the detection interval of perforation increases during abnormal time (see FIG. Four
(See (B) and (C)), the count value of the counter 58 is 1
It will exceed 0. Now, assuming that the reference count value for detecting abnormality is 15, when the count value of the counter 58 reaches 15, at that time, the abnormality detection signal is output from the comparator 59 to the CPU 44 (FIG. 4 (D)). According to this method, abnormal conveyance can be detected regardless of the film conveyance speed.

Next, the case of detecting an abnormal conveyance based on the actual speed of the film will be described. In FIG. 1, the roller 35 is in contact with the film 40, and the film 40
Is configured to rotate according to the movement of the. A slit disk 32A of the encoder 32 is arranged on the rotation shaft of the rotor 35, and the encoder 32 detects the slit of the slit disk 32A.
A pulse signal is output from 2B to the counter 60.

A high-speed reference clock is input to the counter 60, the counter 60 counts the reference clock for one period of the pulse signal applied from the encoder 32, and outputs the count value to the comparator 62. . The other input of the comparator 62 is from the CPU 44 to the film 40.
The reference count value corresponding to the speed command is added, and when the two inputs do not match, or when the difference between the two inputs exceeds a predetermined error range, the comparator 62 regards it as an abnormality in the film conveyance and detects an abnormality. The signal is output to the CPU 44.
It should be noted that if the number of pulses generated per one rotation of the encoder 32 is made sufficiently large, it is possible to detect the above-mentioned abnormality in the film conveyance in almost real time.

Next, the case of detecting an abnormal conveyance at the time of film loading will be described. When the film cartridge 42 is attached to the film scanner, film loading is started automatically or by a loading command from the key panel 64. At the time of film loading, as described above, the spool 42A of the film cartridge 42 is driven in the CW direction, whereby the film 40 is sent out from the film cartridge 42. When the leader portion of the film 40 reaches the position of the roller 34, the film 40 is then conveyed by the roller 34 and passes through the roller 36 to take up the take-up shaft 3 of the take-up reel 38.
It is wound up on 8A. Hereinafter, the film cartridge 42
From the time the spool 42A is driven in the CW direction until the leader portion of the film 40 is taken up by the take-up reel 38 is called film loading.

The film scanner shown in FIG.
Two timers 65 and 66 and a comparator 6 as shown in FIG.
7, 68 are provided. The timer 66 is the CPU 4
When a signal indicating the start of loading is added from 4, the time from the start of loading is measured and the measured time is output to the comparator 67 (see FIGS. 6A and 6B). When the perforation detection signal is applied from the perforation sensor 36 via the waveform shaping circuit 57, the timer 65 stops the time measurement and is reset by the timer.

A predetermined time-out time is added from the CPU 44 to the other input of the comparator 67, and the comparator 6
7 outputs a time-out signal (abnormality detection signal) to the CPU 44 when the measurement time input from the timer 65 exceeds the time-out time (FIG. 6 (D)). That is, when the perforation detection signal is not input within a predetermined time-out period after the film loading is started (FIG. 6 (C)), it is determined that the film 40 has not been properly sent out from the film cartridge 42, and the abnormality is detected. The detection signal is output.

On the other hand, the timer 66 receives the earliest perforation detection signal of the film 40 (that is,
When a first perforation detection signal is input from the perforation sensor 36 via the waveform shaping circuit 57 after a signal indicating the start of loading is added from the CPU 44), the time from the input time is measured, and the measurement time is compared with the comparator 68. (FIGS. 7A to 7C). The timer 66 stops time measurement and is reset when a pulse signal is applied from the encoder 32.

A predetermined time-out time is added from the CPU 44 to the other input of the comparator 68.
8 outputs a time-out signal (abnormality detection signal) to the CPU 44 when the measurement time input from the timer 66 exceeds the time-out time (FIG. 7 (E)). That is, when the pulse signal is not output from the encoder 32 within a predetermined time-out period after the first perforation is detected (FIG. 7D), it is determined that the film 40 is not conveyed to the position of the roller 35. , And outputs an abnormality detection signal.

The perforation sensor 57 is preferably provided on the side of the film cartridge 42, and the roller 35 to which the encoder 32 is attached is preferably provided at a position as close as possible to the side of the take-up reel 38. Further, instead of the perforation sensor 57, a film sensor that detects the presence or absence of a film may be used. Further, by providing the plurality of abnormality detecting means as needed,
More surely avoid damage to the film and equipment. Also,
When any abnormality is detected, the CPU 44 automatically stops the motor. After that, the film 40 is rewound at a low speed that can be stopped immediately in an emergency. During this rewinding, if an abnormal conveyance is detected again, the emergency stop is made again, and an abnormality is displayed on the display 69 to prompt a professional engineer to safely rescue the film 40 and repair the equipment.

FIG. 8 is a block diagram showing another embodiment of the abnormal conveyance detection device for a film scanner according to the present invention.
The same parts as those of the film scanner shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 8, the slit disk 70 of the encoder 70 is provided on the shaft connected to the spool 42A of the film cartridge 42.
A is provided, and the slit of the slit disk 70A is detected by the photodetector 70B and output as a pulse signal. Therefore, the encoder 70 outputs a pulse signal having a frequency proportional to the rotation speed of the spool 42A.

On the other hand, the winding shaft of the winding reel 38 (the radius of the winding core when there is no film) is formed to be equal to the radius of the spool 42A. This take-up reel 38
In the same manner as above, the slit disk 72 of the encoder 72
A is provided, and the slit of the slit disk 72A is detected by the photodetector 72B and output as a pulse signal. Therefore, the encoder 72 outputs a pulse signal having a frequency proportional to the rotation speed of the take-up reel 38. In FIG. 8, 71 and 73 are motors for rotating the spool 42A and the take-up reel 38, respectively.

The pulse signals output from the encoders 70 and 72 are added to counters 74 and 76, respectively. The sampling signals from the sampling timer 78 are added to the counters 74 and 76 at a constant cycle.
And 72, the pulse signals input from each of the sampling signals are counted every period of the sampling signal, and each count value is input as a signal indicating the rotation speed of the spool 42A of the film cartridge 42 and the rotation speed of the take-up reel 38. To the CPU 44.

Now, the spool of the film cartridge 42
The radius of the reel 42A and the radius of the take-up reel 38 are equal.
Therefore, the maximum take-up diameter of the spool 42A and the take-up reel 38
(R_max) Are the same, and the minimum winding diameter (R
_min) Is also the same. In addition, as shown in FIG.
A film cart at the start of transportation after the completion of feeding
The maximum winding diameter of the ridge 42 is R_maxTake and roll
The winding diameter of le 38 is the minimum value R _minTake Then fill
When the film is transported in the forward direction, the film cartridge side
The winding diameter decreases and the winding diameter on the winding reel side increases.
The film cartridge at the end of transport of all films.
The minimum winding diameter on the edge side is R_minThe take-up reel side
The maximum winding diameter is R_maxTake

When the transport speed v of the film 40 is constant, the rotation speeds of the film cartridge side and the take-up reel side are as shown by the solid and broken lines in FIG. That is, the rotation speed on the film cartridge side increases at an accelerating rate, while the rotation speed on the take-up reel side gradually decreases. In FIG. 10, ω _max indicates the maximum rotation speed and ω _min indicates the minimum rotation speed.
_max and ω _min are the transport speed v and the maximum winding diameter R
It can be expressed by the following formula from _max and the minimum winding diameter R _min .

Ω _max = v / R _min , ω _min = v / R _max Furthermore, the average rotational speeds on the film cartridge side and the take-up reel side are as shown by the alternate long and short dash line in FIG. Here, the average rotation speed becomes maximum at the time of start of conveyance or at the end of conveyance, and becomes minimum when the rotation speeds of the film cartridge side and the take-up reel side match.

The maximum average rotational speed is (ω _max + ω
_min ) / 2 and the minimum average rotation speed is ω ₀ ,
It can be expressed by the following equation. ω ₀ = 2v / (R _max + R _min ) Now, the CPU 44 detects the rotation speed of the spool 42A of the film cartridge 42 and the rotation speed of the take-up reel 38 from the count values input from the counters 74 and 76, respectively. When the rotation speed deviates from the range in which the fluctuation range of ω _{min to} ω _max has some margin, it is detected as an abnormality. Further, the average of the two rotation speeds is calculated, and the average rotation speed is ω ₀ to (ω _max + ω _min ).
If it deviates from the range in which the variation width of / 2 has some margin, it is detected as an abnormality.

The former abnormality detection is easy, but the accuracy of detection is low because the range of rotational speed considered to be normal is wide. On the other hand, in the latter abnormality detection, the detection accuracy is high because the range of the average rotation speed regarded as normal is narrow. Further, in the above embodiment, the average rotation speed is calculated, but the present invention is not limited to this, and the total value of the rotation speeds may be calculated.

FIG. 11 is a schematic view showing still another embodiment of the abnormal conveyance detection device for a film scanner according to the present invention. Film 80 used in this film scanner
For example, a perforation 80A indicating the position of the image recording area A of each frame is provided for each frame, and the magnetic recording layer 80 on which magnetic information is recorded for each frame.
B and a barcode 80C are provided. On the other hand, on the film scanner side, in addition to the CCD line sensor 82 and the perforation sensor 84, the magnetic recording layer 80B is provided.
Further, a magnetic head 86 for recording / reproducing magnetic information and a bar code sensor 88 for reading the bar code 80C are provided.

In this film scanner, when the image in the image recording area A of each frame of the film 80 is read by the CCD line sensor 82, the film 80 is conveyed at a constant speed. During this conveyance, the perforation sensor 84 The perforation 80A is read, the magnetic head 86 reads the magnetic data recorded in the magnetic recording layer 80B, and the barcode sensor 88 reads the barcode 80C.

By the way, when the film 40 is conveyed at a constant speed, the time intervals of the respective information read by the respective sensors are also constant. Therefore, as shown in FIG. 11, various sensors are arranged at appropriate positions, the input timing of each information is detected, and the time interval of the detected information is detected by a timer (not shown). Then, at least one of the detected time intervals exceeds the predetermined allowable range with respect to the time interval of the detection information of each sensor obtained when the film 40 is normally conveyed at a constant speed. The case is detected as an abnormal conveyance.

In the case where the abnormal conveyance is detected as described above, it is not necessary to add a special sensor for detecting the abnormal conveyance, and even when a sensor for increasing the detection accuracy is added. The number of sensors can be reduced.

[0052]

As described above, according to the abnormal conveyance detecting device for the film scanner of the present invention, the change of the rotation speed of the roller for moving the film at a predetermined speed and the change of the drive current of the motor for conveying the film. Since the abnormality of the transport state of the film is detected based on the difference between the rotation amount of the roller and the movement amount of the film, the change in the moving speed of the film, etc., it can be detected in real time at the perforation detection period or less. Therefore, it is possible to prevent an abnormal load from being applied to the film, and it is possible to more reliably prevent damage to the film and the device. Further, when the film is loaded, the abnormality is detected by monitoring the time taken for the film to reach the predetermined position, so that the loading abnormality can also be detected. Furthermore, according to the present invention, the spool of the film cartridge and the take-up shaft have the same diameter, and the abnormal conveyance is detected based on the respective rotation speeds of the spool and the take-up shaft. This can be detected even if an abnormality occurs in the. Further, since the abnormal conveyance is detected based on the time interval of each detection signal of the plurality of sensors used in the film scanner, there is an advantage that a special sensor does not have to be added for detecting the abnormal conveyance. is there.

[Brief description of drawings]

FIG. 1 is a block diagram showing a film scanner including an abnormal conveyance detection device for a film scanner according to the present invention.

FIG. 2 is a waveform diagram used to explain a current abnormality of a motor for film transport.

FIG. 3 is a waveform diagram used for explaining an abnormality in the rotation speed of a film conveying motor.

FIG. 4 is a timing chart used to explain a detection device that detects an abnormality from a change in a perforation detection interval.

FIG. 5 is a block diagram of a main part used for explaining a detection device for detecting an abnormality at the time of film loading.

FIG. 6 is a timing chart used for explaining abnormality detection during film loading.

FIG. 7 is a timing chart used for explaining abnormality detection during film loading.

FIG. 8 is a block diagram showing another embodiment of the abnormal conveyance detection device for a film scanner according to the present invention.

FIG. 9 is a graph showing changes in the winding diameter on the film cartridge side and the winding reel side with respect to the film transport time.

FIG. 10 is a graph showing changes in the rotation speed on the film cartridge side, the rotation speed on the take-up reel side, and the average rotation speed thereof with respect to the film transport time.

FIG. 11 is a schematic view showing still another embodiment of the abnormal conveyance detection device for a film scanner according to the present invention.

[Explanation of symbols]

 10 ... Fluorescent lamp 12 ... Photographing lens 14, 82 ... CCD line sensor 20 ... Memory controller 22 ... Image memory 26 ... Motor 28 ... Clutch 30, 32, 70, 72 ... Encoder 34, 35 ... Roller 36, 84 ... Perforation sensor 38 ... Take-up reel 40, 80 ... Film 40A, 80A ... Perforation 42 ... Film cartridge 42A ... Spool 44 ... CPU 52 ... Current detector 56, 58, 60, 74, 76 ... Counter 59, 62, 67, 68 ... Comparator 65, 66 ... Timer

Claims (12)

[Claims] 1. An abnormal conveyance preventing device for a film scanner, which conveys a developed photographic film at a predetermined speed by a roller to which a rotational driving force from a motor is transmitted, and reads an image of the film with a line sensor. A speed detection unit that detects the rotation speed of the roller, and an abnormality detection unit that detects an abnormality in the transport state of the film based on a change in the rotation speed detected by the speed detection unit. An abnormal conveyance detection device for a film scanner. 2. The speed detecting means includes a rotating member that rotates integrally with the roller, an encoder that outputs a number of pulse signals proportional to the rotating speed of the rotating member, and a pulse output from the encoder. 2. An abnormal conveyance detection device for a film scanner according to claim 1, further comprising a counter that integrates the signal for each predetermined sampling period. 3. Arranged between the motor and the roller,
3. The abnormal conveyance detection device for a film scanner according to claim 1, further comprising a clutch that slips when a predetermined torque slightly larger than a torque required for normal film conveyance is applied. 4. A film which has been developed and has perforations formed at regular intervals is conveyed at a predetermined speed by a roller to which a rotational driving force from a motor is transmitted, and an image of the film is read by a line sensor. An abnormal transport detection device for a scanner, comprising: a clutch disposed between the motor and the roller, the clutch slipping when a rotational driving force exceeding a predetermined torque required for normal film transport is applied; An encoder that includes a rotating member that rotates reciprocally, and outputs a number of pulse signals proportional to the rotational speed of the rotating member; a perforation detecting unit that detects the perforation of the film; and a perforation is detected by the perforation detecting unit. And the next perforation is detected And a counter that counts the number of pulse signals output from the encoder, and compares the count value of the counter with a reference count value corresponding to the speed at which the film should be conveyed, thereby detecting an abnormality in the conveyance state of the film. An abnormality conveyance detecting device for a film scanner, comprising: abnormality detecting means for detecting 5. An abnormal conveyance detection device for a film scanner, which conveys a developed photographic film by a first roller at a predetermined speed and reads an image of the film with a line sensor, the apparatus being in contact with the film. A second roller that rotates according to the movement of the film; and a rotating member that rotates integrally with the second roller,
An encoder that outputs a number of pulse signals proportional to the rotation speed of the rotating member, a measuring unit that measures the period of the pulse signal output from the encoder, and a period of the pulse signal measured by the measuring unit is the film. An abnormal conveyance detecting device for a film scanner, comprising: an abnormality detecting unit that detects an abnormality when a reference period corresponding to the predetermined speed is exceeded. 6. A current detecting means for detecting a value of a current flowing through the motor, and an abnormality detecting means for detecting an abnormality in a transport state of the film based on a magnitude of a current value detected by the current detecting means. 6. The method according to claim 1, 2, 3, 4, or 5
Abnormal conveyance detection device for film scanner. 7. When a film cartridge, in which a developed photographic film is wound around a uniaxial spool, is mounted, the spool of the film cartridge is driven to dispose a roller in the leader portion of the film. An abnormal conveyance preventing device for a film scanner that conveys the film at a predetermined speed by the roller and reads an image of the film with a line sensor, and punches the film or the film. Detecting means for detecting the perforation, a timer for measuring the time from the driving start time of the spool for feeding the film from the film cartridge, and the detecting means for detecting the film or perforation within a predetermined measurement time by the timer. Abnormal if not detected An abnormal conveyance detection device for a film scanner, comprising: 8. The detecting means is arranged in the vicinity of the film cartridge.
Abnormal conveyance detection device for film scanner. 9. When a film cartridge, in which a developed photographic film is wound around a uniaxial spool, is mounted, the spool of the film cartridge is driven to cause the first roller to move the leader portion of the film. An abnormal conveyance detection device for a film scanner, which feeds the film to a position where the film is arranged, and then conveys the film at a predetermined speed by the first roller and reads an image of the film with a line sensor. A second roller that abuts on the roller and rotates according to the movement of the film; and a rotating member that rotates integrally with the second roller,
An encoder that outputs a pulse signal of a number proportional to the rotation speed of the rotating member, and a detection unit that is disposed upstream of the second roller and that detects the film or perforations formed in the film. A timer for measuring the time from the time when the detecting means first detects the film or perforation, and an abnormality detecting means for detecting a case where the encoder does not output a pulse signal within a predetermined measurement time by the timer as an abnormality An abnormal conveyance detection device for a film scanner, comprising: 10. When a film cartridge in which a developed photographic film is wound around a uniaxial spool is mounted, a spool is driven on the film cartridge to dispose a roller on the leader portion of the film. A film scanner that conveys the film at a predetermined speed by the roller, winds the film around a winding shaft, and reads an image of the film being conveyed at the predetermined speed by a line sensor. An abnormal conveyance detection device, wherein the winding shaft has the same diameter as the spool of the film cartridge, rotation speed detecting means for detecting the rotation speeds of the spool and the winding shaft of the film cartridge, respectively, Each rotation speed detected by the rotation speed detecting means is a predetermined speed of the film, When deviating from the preset first speed range based on the minimum and maximum diameters of the take-up shaft, and / or the average value or the total value of the rotation speeds,
Abnormality detecting means for detecting an abnormality when the speed deviates from a preset second speed range based on the predetermined speed of the film and the minimum and maximum diameters of the winding shaft. Abnormal conveyance detection device for film scanner. 11. An abnormal-conveyance detecting device for a film scanner, which conveys a developed photographic film at a predetermined speed by rollers and reads an image of the film by a line sensor, wherein a plurality of devices are used in the film scanner. Based on each detection signal of the sensor, the detection means for detecting the time interval of each detection signal during the period when the film is conveyed at a predetermined speed, and the film is normally conveyed at a predetermined speed. Abnormality detection means for detecting an abnormality when at least one of the time intervals detected by the detection means exceeds a predetermined allowable range with respect to the time interval of the detection signal of each sensor obtained during An abnormal conveyance detection device for a film scanner, comprising: 12. The plurality of sensors are a magnetic head for reading magnetic information recorded for each frame on a magnetic recording layer of the film, a perforation sensor for detecting perforations formed in the film, and the film. 12. An abnormal conveyance detection device for a film scanner according to claim 11, which is a bar code sensor for reading a bar code recorded on the sheet and two or more of the line sensors.