JPH1130820A - Film image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To read a frame image with desired accuracy, to simplify and miniaturize a film carrying mechanism and to reduce the damage of film. SOLUTION: The film 103 is carried between a film supply part 20 feeding the film 103 from a film cartridge 100 and a take-up spool 32 to which rotational driving force is transmitted from a film driving motor 10, and the frame image is read by an image pickup means having a line sensor 44. In the case of reading the frame image, the film 103 is carried only by taking up the film by the spool 32. The spool 32 whose diameter D is within the range of 13 mm<=D<=40 mm is used, and further the rotating speed of the motor to make film carrying speed constant is read out from a lookup table 52 in accordance with film take-up amount in order to make film carrying speed to constant speed previously set in spite of the fluctuation of the take-up diameter of the spool 32, and the motor 10 is controlled so as to attain the obtained rotating speed of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film image reading apparatus, and more particularly to a film image reading apparatus for reading each frame image of a one-roll developed photographic film housed in a film cartridge by a line sensor.

[0002]

2. Description of the Related Art In recent years, a new photographic film in which a magnetic layer is formed on one side of a silver halide film has been proposed (USP5).
No. 130745), a film cartridge for accommodating the film, and a camera for photographing using the film cartridge have been developed, and have been standardized worldwide.

[0003] This new standard film cartridge 100
As shown in FIGS. 6 (a) and 6 (b), a spool 1 is provided in a substantially cylindrical cartridge shell 101 having a light shielding structure.
02 is stored, and a light-blocking door 104 is provided at one end of the cartridge shell 101. When the camera is not loaded or taken out of the camera, the film 103 is always kept. The light shielding door 104 is completely housed in the cartridge shell 101.
Has a structure to protect from external light. The light shielding door 104 is opened and closed by inserting a door driver (not shown) into the light shielding door opening / closing hole 106 and rotating the door driver.

On one side (reference surface) of the cartridge shell 101, a data disk 105 is provided which rotates together with the spool 102. On the outer surface of the data disk 105, the type of film 103, film sensitivity, A bar code indicating film information such as the number of frames that can be photographed is printed or the like. On the other side of the cartridge shell 101, holes 111, 112, 113, and 114 of circles, squares, crosses, and half moons are formed, and a spool 102 is provided on the back side of these holes. There is a white tongue (not shown) that rotates together with the
According to the stop position of the tongue piece, any one of a circle, a square, a cross, and a half moon is displayed in a so-called outline.

[0005] The film 103 has a silver salt photosensitive layer applied to the front surface 103F of the film base, and a magnetic recording layer applied to the back surface 103R. Also, film 103
A plurality of perforations 121, 121... That define the range of each photographing frame 120 are formed at the edge of the magnetic recording areas 124, 125 at the upper and lower ends of each photographing frame. It is possible to magnetically record distance, other shooting information, and information of a user message such as a photo title.

In recent years, a film image reading apparatus using the above-mentioned film cartridge 100 in which a developed film 103 is stored has been proposed. This film image reading apparatus transports the film 103 at a constant speed by sandwiching the film 103 sent from the film cartridge 100 between a pinch roller and a capstan roller, and reads a frame image by a line sensor during the transportation. An image signal indicating the read frame image can be output to a monitor TV or a personal computer.

[0007]

However, the conventional film image reading apparatus is provided with a pinch roller and a capstan roller for transporting the film at a constant speed, so that the film transport mechanism becomes complicated and the components become inconvenient. There was a problem that the number of points was large and the device became large. Further, since the film is transported while being pinched by the pinch roller and the capstan roller, there is a problem that the film damage is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and allows a frame image to be read with a desired accuracy, simplification and downsizing of a film transport mechanism, and reduces film damage. It is an object of the present invention to provide a film image reading apparatus capable of reducing the number.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a film cartridge in which a developed photographic film provided with a mark corresponding to each frame is wound around a spool and housed in a cartridge shell. The film image reading apparatus to be used has a film drive motor and a spool drive shaft that engages with a spool of the film cartridge, and rotates the spool drive shaft to send out a photographic film from the film cartridge or into the film cartridge. A film supply unit for rewinding the photo film; and a take-up spool to which a rotational driving force is transmitted from the film drive motor. By rotating the take-up spool, the photo film supplied from the film supply unit is wound. Film take-up unit
An imaging unit that includes a line sensor, captures the photographic film conveyed from the film supply unit to the film winding unit, and outputs an image signal indicating the captured frame image; and detects a mark on the photographic film. Mark detecting means, and a table or a calculation formula showing a motor rotation speed with respect to a film winding amount for setting a film transport speed to a predetermined constant speed regardless of a change in a winding diameter of the winding spool, Control means for obtaining a motor rotation speed for transporting the photographic film at the constant speed from the table or the calculation formula based on the detection output of the mark detection means, and controlling a film drive motor to be the motor rotation speed; , Is provided.

That is, according to the present invention, when a frame image is scanned, a film is conveyed only by winding the film on a take-up spool without providing a pinch roller and a capstan roller in order to convey the film at a constant speed. still,
The diameter D of the take-up spool needs to be 13 mm or more, which is the minimum diameter that can be normally used as a take-up spool, and the maximum diameter 40 mm at which the first frame image can be read from the length of the leading end of the photographic film. It must be:
However, when giving priority to the film speed error in one frame, the larger the diameter D of the take-up spool is, the better.

Since the spool diameter of the take-up spool gradually increases, the rotation speed of the film drive motor is reduced in inverse proportion to the increase in the spool diameter to keep the film transport speed constant. According to another aspect of the present invention, instead of controlling the rotation speed of the film drive motor so that the film transport speed is constant, the rotation speed of the film drive motor is kept constant, and the sampling period of the line sensor is changed. Is set to a sampling period corresponding to the film transport speed, and the film feed amount for each sampling is made constant regardless of changes in the film transport speed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a film image reading apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a film image reading apparatus according to the present invention. The film image reading apparatus 1 mainly includes a film supply unit 20 and a film winding unit 30 to which a rotational driving force is transmitted from a film driving motor 10 via gear trains 12 and 14, a lamp 40,
The system includes an imaging unit including a photographing lens 42 and a line sensor 44, an image processing device 46, and a central processing unit (CPU) 50 that controls and controls the present system.

As shown in FIG. 2, the film cartridge 100 (see FIG. 6) in which the developed photographic film is stored is loaded into the cartridge storage chamber 21 of the film supply section 20 with the reference surface side of the film cartridge 100 at the top. Thereafter, the chamber door 22 is closed. A spool driving shaft 23 and a door driver 24 which fit into the spool 102 and the light shielding door opening / closing hole 106 of the film cartridge 100, respectively, are provided at the depth end of the cartridge storage chamber 21. The chamber door 22 is provided with guide shafts 25 and 26 which respectively engage with the spool 102 and the light shielding door opening / closing hole 106 of the film cartridge 100 when the chamber door 22 is closed. The guide shaft 25 engaged with the spool 102 is rotatable around a shaft 25A, and is elastically movable in the axial direction.

The door driver 24 drives the light shielding door 104 of the film cartridge 100 to open and close. After the film cartridge 100 is loaded in the cartridge storage chamber 41 and the chamber door 22 is closed, the film 103 is removed from the film cartridge 100. When the film cartridge 100 is fed out, the light-shielding door 104 is opened, and when the film 103 is completely wound around the film cartridge 100 and the film cartridge 100 is discharged from the cartridge storage chamber 21, the light-shielding door 104 is closed.

The spool drive shaft 23 is configured to transmit a forward / reverse drive force from the film drive motor 10 via the gear train 12.
The film 103 is sent out from the film cartridge 100 by rotating the spool 102 in the counterclockwise direction in FIG. 1, and the film 103 is rewound into the film cartridge 100 by rotating the spool 102 clockwise.

The film 103 sent from the film supply section 20 is guided to the film winding section 30 by passing between the film guide members 60 and 62. Note that the film guide member 60 has a curved imaging area, so that the flatness of the film 103 in the width direction can be ensured. Further, the film guide member 60 is provided with a perforation sensor 70 for detecting the perforation formed on the film 103.

The film take-up section 30 includes a take-up spool 32 to which a rotational driving force is transmitted from the film drive motor 10 via the gear train 14, and a guide wall section 34 for winding the film 103 around the take-up spool 32. And pressing rollers 36 and 38. Here, the peripheral speed of the take-up spool 32 is set to a speed higher than the film feed speed supplied from the film supply unit 20 to enable the film 103 to be wound.
When 03 is wound around the take-up spool 32, the film transport speed is determined by the peripheral speed of the outermost periphery of the take-up spool 32. The gear trains 12 and 14 are provided with a swinging gear mechanism and a clutch that rotate according to the rotation direction of the film drive motor 10, and switch the rotation direction of the film drive motor 10 to change the rotation direction of the film drive motor 10.
The film 103 can be sent out / rewinded by rotating the spool 102 forward / reversely from the film cartridge 100, and the film can be transported by rotating the take-up spool 32 counterclockwise in FIG. I can do it. The film drive motor 1
The gear train 14 from 0 to the take-up spool 32 has a minimum number of gears (for example, three or less) so that the accuracy of each gear does not affect the film transport speed.

The control of the film drive motor 10 for keeping the diameter of the take-up spool 32 and the film transport speed constant will be described later. Now, the film guide member 6
The film 103 passing through the imaging areas 0 and 62 is illuminated by the lamp 40. The image light of the film 103 illuminated by the lamp 40 forms an image on the light receiving surface of the line sensor 44 via the taking lens 42. The image light formed on the light receiving surface of the line sensor 44 is converted by each sensor into signal charges of an amount corresponding to the light intensity. The signal charges thus accumulated are read out to the shift register by a read gate pulse of a predetermined cycle applied from a CCD drive circuit (not shown), and are sequentially read out as image signals by register transfer pulses.

The image signals sequentially read from the line sensor 44 in this manner are subjected to necessary signal processing by the image processing device 46 and then recorded in an image memory (not shown). Then, the image signal for one frame recorded in the image memory is sequentially and repeatedly read out, and output to a monitor 80 such as a television connected to the film image reading apparatus 1, whereby one frame image is displayed on the monitor. It is displayed at 80.

Next, a preferred spool diameter of the take-up spool 32 will be described. First, the diameter D of the take-up spool
Has a minimum diameter of 13 mm that can be used normally as a take-up spool.
It is necessary to satisfy the condition (φ13 ≦ D). Also, at the leading end of the film before the top frame of the film 103, FIG.
Information indicating the top and bottom direction at the time of shooting as shown in (CHOL)
Is exposed and recorded by a light source built in the camera. Then, the film 103 is reshaped twice on the take-up spool, and the above CH is detected by a bar code sensor (not shown).
The maximum diameter of the take-up spool from which OL information can be read is φ23
It is. In FIG. 3, CHP indicates an area where a fat bit indicating a print format (C, H, P size) is recorded by a light source in the camera.

On the other hand, from the length of the leading end of the film 103, the maximum diameter from which the top frame image can be read is 40 m.
m. Therefore, the diameter D of the take-up spool is 40 mm
It is necessary to make the following (D ≦ φ40). Further, as the diameter of the take-up spool is larger, the film speed error within one frame can be reduced. Incidentally, the diameter D needs to be 20 mm or more in order to keep the error within one frame within about 0.6% (about 1/5 of the normal specification of 3%).

Accordingly, the diameter D of the take-up spool is φ13 ≦
It is necessary to satisfy D ≦ φ40, and in consideration of winding around the winding spool and film feeding accuracy, the diameter D of the winding spool is preferably in the vicinity of φ20 to φ23. When the rotation speed of the film drive motor 10 is controlled to a constant speed, FIG.
As shown in FIG.
The speed increases with an increase in the spool diameter of No. 2 (that is, the film winding amount (number of frames)). Therefore, in order to control the film transport speed to be constant as shown in FIG. 4B, the rotation speed of the film drive motor 10 should be reduced in accordance with the film winding amount (frame number) by the winding spool 32. Good.

That is, the lookup table (LUT) 52 shown in FIG. 1 previously stores data indicating the relationship between the film winding amount (number of frames) and the motor rotation speed shown in FIG. 4B. The CPU 50 detects the frame number of the frame image to be scanned by counting the detection signal from the perforation sensor 70, reads a required motor rotation speed from the LUT 52 based on the frame number, and sets the motor rotation speed to Thus, the film drive motor 10 is controlled via the motor control circuit 54. As described above, the film transport speed is made substantially constant by reducing the rotation speed of the film drive motor 10 by the step approximation of each frame or by decreasing the rotation speed by the linear approximation.

The data may be stored in the LUT 52 based on data obtained at the time of pre-scanning the film 103. That is, the film image reading apparatus 1 continuously feeds the film 103 before performing the main scan, reads the frame image of each frame during the continuous feeding, and adjusts the brightness and white balance of each frame. Perform a pre-scan to obtain By performing this prescan while keeping the motor rotation speed constant, and detecting the passage time of each perforation detected by the perforation sensor 70, FIG.
Data corresponding to the graph of (A) can be obtained. Therefore, data corresponding to the graph of FIG. 4B can be obtained based on the data corresponding to the graph of FIG.

Next, another embodiment of the present invention will be described. In this embodiment, the film drive motor 10
The rotation speed of the line sensor 44 is kept constant, and the sampling cycle for image capture in the line sensor 44 is controlled according to the film transport speed. That is, when the rotation speed of the film drive motor 10 is controlled to a constant speed as shown in FIG. 4A, the film transport speed increases with an increase in the film winding amount (frame number) on the winding spool 32. Become. Therefore, as shown in FIG. 5, a timing signal for image capture having a cycle corresponding to the film transport speed is generated. The timing signal is generated such that the cycle becomes shorter as the film transport speed increases so that the film feed amount for each timing signal becomes constant.

The signal charges stored in the line sensor 44 shown in FIG. 1 are read out to the shift register by a read gate pulse corresponding to the cycle of the image capture timing signal, and then sequentially by the register transfer pulse. Is read. Data such as the cycle of the timing signal is stored in the LUT in advance similarly to the above-described embodiment, detects the frame number of the frame image to be scanned, and determines the required sampling cycle from the LUT based on the frame number. The reading and the driving of the line sensor 44 are controlled so as to be in the sampling cycle.

In this embodiment, the required motor rotational speed and the required sampling period are read from the LUT. However, the present invention is not limited to this. The rotation speed and the sampling period may be obtained. Further, in this embodiment, the frame number is detected by counting the perforations, and the film drive motor is controlled based on the detected frame number, or the sampling period of the line sensor is controlled. Not limited to this, a mark is provided for each frame of the photo film, the frame number is detected by optically detecting the mark, and the film drive motor is controlled based on the detected frame number, or a line sensor is provided. May be controlled.

[0028]

As described above, according to the film image reading apparatus of the present invention, since a capstan roller or the like is not used, the film transport mechanism can be simplified and downsized, and film damage can be reduced. Reduction can be achieved. In addition, a take-up spool having a predetermined spool diameter is used, and the rotation speed of the film drive motor or the sampling period of the line sensor is controlled in accordance with the film take-up amount or the number of frames. Can be read.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a film image reading apparatus according to the present invention.

FIG. 2 is a perspective view of a film supply unit of the film image reading apparatus shown in FIG.

FIG. 3 is a diagram showing a standard in the vicinity of the leading perforation of a photographic film applied to the present invention.

FIGS. 4A and 4B are graphs each showing a relationship between a film transport speed and a motor rotation speed with respect to a film winding amount.

FIG. 5 is a diagram showing a timing signal for reading an image.

FIG. 6 is a perspective view of a film cartridge applied to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Film image reading device 10 ... Film drive motor 12, 14 ... Gear train 20 ... Film supply part 23 ... Spool drive shaft 30 ... Film take-up part 32 ... Take-up spool 40 ... Lamp 42 ... Photographing lens 44 ... Line sensor 46 ... Image processing device 50 ... Central processing unit (CPU) 52 ... Look-up table (LUT) 54 ... Motor control circuit 60,62 ... Film guide member 70 ... Perforation sensor 100 ... Film cartridge 102 ... Spool 103 ... Film 121 ... Perforation

Claims (7)

[Claims] 1. A film image reading apparatus using a film cartridge stored in a cartridge shell by winding a developed photographic film having a mark corresponding to each frame on a spool, comprising: a film drive motor; A film drive unit that has a spool drive shaft that engages with a spool of the cartridge, and that feeds a photographic film from a film cartridge or rewinds a photographic film into the film cartridge by rotating the spool drive shaft; and A film take-up unit having a take-up spool to which a rotational driving force is transmitted, and a film take-up unit for taking up a photographic film supplied from the film supply unit by rotating the take-up spool; Section to the film winding section An imaging unit that captures an image of the photographic film to be sent and outputs an image signal indicating the captured frame image; a mark detection unit that detects a mark on the photographic film; and a change in a winding diameter of the winding spool. Regardless, it has a table or a calculation formula indicating the motor rotation speed with respect to the film winding amount for setting the film transport speed to a predetermined constant speed, and the table or the calculation formula is used based on the detection output of the mark detection means. Control means for determining a motor rotation speed for transporting the photographic film at the constant speed and controlling a film drive motor so as to achieve the motor rotation speed. 2. A film image reading apparatus using a film cartridge stored in a cartridge shell by winding a developed photo film provided with a mark corresponding to each frame on a spool, comprising: a film drive motor; A film supply unit having a spool drive shaft engaged with a spool of the film cartridge, for rotating the spool drive shaft to send out a photographic film from the film cartridge or rewind the photographic film into the film cartridge; A film take-up unit for taking up a photographic film supplied from the film supply unit by rotating the take-up spool; and a line sensor. From the film supply unit, the film winding An imaging unit that captures the photographic film conveyed to the unit and outputs an image signal indicating the captured frame image; a mark detection unit that detects a mark of the photographic film; and a constant rotation speed of the film drive motor. And a table or a calculation formula indicating a sampling period for capturing an image in the line sensor for keeping the film feed amount for each sampling constant irrespective of a change in the film transport speed, wherein the mark detection means Control means for obtaining a sampling cycle corresponding to the film transport speed from the table or the calculation formula based on the detection output of (a), and controlling the line sensor so as to be at the sampling cycle. Reader. 3. The film image reading apparatus according to claim 1, wherein a rotational driving force is transmitted to the spool driving shaft from the film driving motor. 4. The take-up spool has a diameter D of 13
3. The film image reading apparatus according to claim 1, wherein the winding spool has a range of mm ≦ D ≦ 40 mm. 5. The control means continuously feeds the photographic film by rotating the film drive motor at a constant speed, and the passing time of each mark detected by the mark detecting means during the continuous feeding. 3. The film image reading apparatus according to claim 1, wherein the table or the calculation formula is obtained based on the following. 6. The control device according to claim 1, wherein the control unit performs a prescan for detecting a photographing condition of each frame image of the photographic film based on an output of the imaging unit during continuous feeding of the photographic film. Item 5. The film image reading device according to Item 5. 7. The film image reading apparatus according to claim 1, wherein the mark is a perforation formed in correspondence with each frame of the photographic film.