JPH09189950A - Film feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To write magnetic information on a film, without generating irregularities in film traveling by making a no-load feeding speed slower than a normal take-up speed, so as to make the taking up state of the film sure. SOLUTION: The film 24 is loaded and taken up by a motor driving circuit 18 and a film feeding motor 21. Then, the film 24 is taken up by a take-up spool 23 by the motor driving circuit 18 and the driving force of the film feeding motor 21. Further, while the film is taken up, the magnetic recording is attained on the magnetic track of the film 24 by a magnetic head 29. Further, at the time of loading a film cartridge 22, a film leader part is fed from the film cartridge 22 at a speed lower than a film take-up speed by the take-up spool 23 by the motor driving circuit 18 and the driving force of the film feeding motor 21, to be wound on the take-up spool 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding device, and more particularly, to a film feeding device for a camera using a film with a magnetic recording portion having a magnetic head for writing information to the magnetic recording portion of the film. It is a thing.

[0002]

2. Description of the Related Art In a conventional film feeding device for a camera, as disclosed in, for example, Japanese Patent Laid-Open No. 2-67534, a film spool is rotated to feed a film from its cartridge, and the film is fed to a take-up spool. In order to wind the film, the reduction gear ratio of the film rewinding gear train is set to be larger than the reduction gear ratio of the film winding gear train. Further, in Japanese Unexamined Patent Publication No. 4-128732, the amount of movement of the film is detected by a roller,
Techniques for writing magnetic information on a film are disclosed. Then, by combining these techniques, a technique for accurately writing magnetic information in the magnetic information storage portion of the film has been developed.

[0003]

However, when the magnetic information is written on the film by using the above-mentioned techniques in combination, the film travels (travel amount, running amount, filming start frame, initial shooting frame, etc.). The running speed) was uneven, and normal writing could not be performed. It is considered that this is because the films wound on the take-up spool move relative to each other during the take-up rotation.

FIG. 5 is a diagram showing that the above-described phenomenon of uneven running of the film is captured. The graph shown in the upper part of FIG. 5 is the current flowing through the film winding motor,
The graph shown at the bottom of the figure is a pulse indicating the running of the film.

In the graph showing the film running, there are many portions where the pulse width is not uniform as shown in FIG. This means that the film running itself is not running uniformly. As described above, conventionally, when the magnetic information is written on the film, if the running of the film becomes uneven, the normal writing cannot be performed.

The present invention has been made in view of the above problems, and provides a film feeding device capable of performing normal writing without causing unevenness in running of the film when writing magnetic information on the film. The purpose is to

[0007]

That is, the present invention is a film feeding device for a camera, which comprises a film cartridge having a magnetic head for performing magnetic recording and wound and enclosing a film with a magnetic track. ,
And a winding means for winding the film by a driving force of the driving means, and a driving means for winding the film, and a film leader portion from the cartridge by the driving force of the driving means when the cartridge is loaded. A film feeding means for feeding the leader portion around the winding spool by feeding the film at a speed lower than the film winding speed by the winding means.

Further, according to the present invention, in a film feeding device for a camera equipped with a magnetic head, which uses a film cartridge containing a film with a magnetic recording portion, a driving means and a driving force of the driving means are received, Receiving the driving force of the winding means for winding the film and the driving means, the film is delivered from the film cartridge, and further, the winding means feeds the film to the winding means side. And a feeding means having a speed slower than the winding speed, and for loading the film cartridge into the camera and then feeding the film in idle, the film is fed at a winding speed slower than the winding speed for each photographing. It is characterized by sending.

The present invention relates to a film feeding apparatus for a camera, which is equipped with a magnetic head for magnetic recording and uses a film cartridge in which a film with a magnetic track is wound and enclosed. Done. Then, by the driving force of the driving means, the film is wound by the winding means including the winding spool. Further, during the film winding, magnetic recording is performed on the magnetic track of the film by the magnetic recording means.
Further, at the time of loading the cartridge, the film leader section is sent from the cartridge by the driving force of the driving section at a speed lower than the film winding speed by the winding section by the film sending section, and the leader section is transferred to the winding spool. Wrapped around.

Further, according to the present invention, in a film feeding device for a camera having a magnetic head, which uses a film cartridge containing a film with a magnetic recording portion, the film is wound by receiving a driving force of a driving means. It is wound up by means. Further, in response to the driving force of the driving means, the film is fed from the film cartridge, and further, in order to feed the film to the winding means side, the feeding means adjusts the speed of the film winding by the winding means. Even its speed is slowed down. Then, in order to feed the film idly after loading the film cartridge into the camera, the film is idly fed at a winding speed slower than the winding speed for each photographing.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, the mechanical structure of an embodiment of the present invention will be described. The mechanical structure for feeding the film of the film feeding apparatus of the present invention uses the technique disclosed in the first embodiment of the above-mentioned Japanese Patent Laid-Open No. 2-67534. That is, the film feeding device
A single drive source motor for driving the film winding shaft (winding spool) and the rewinding shaft, and a first gear train connecting the motor and the winding shaft, the motor and the rewinding shaft are provided. Has a second gear train connecting the two.

The gear ratio of the first gear train is lower than that of the second gear train, and the film winding speed is set to be higher than the film speed sent out from the cartridge. In addition, there is a one-way clutch in the first gear train, and when winding the film around it,
The driving force of the motor is transmitted to the winding shaft. Further, when the film is not wound, that is, when the film moves in the direction away from the winding shaft, this transmission is not performed.

On the other hand, the second gear train has a planetary gear in the middle thereof, and the driving force of the motor is transmitted to the sun gear that meshes with the planetary gear. Two driven gears driven by a planetary gear are arranged ahead of the planetary gear, and which of the two driven gears meshes with the planetary gear is determined according to the rotation direction of the motor. To be done.

One of the driven gears drives a fork member as a rewinding shaft via the one-way clutch. When one of the driven gears receives the driving force of the motor for feeding the film from the film cartridge,
The one-way clutch connects the one driven gear and the fork member, and the film is sent out from the film cartridge. At this time, if the film is pulled out of the cartridge at a speed higher than the feeding speed, the one-way clutch is disconnected.

The other driven gear of the driven gears is connected to the fork member via another gear train. This is because the driving force of the motor rewinds,
It is driven when the driving force rotates.

With respect to the mechanism of the film feeding apparatus having the above-mentioned structure, the following will briefly describe the idling of the film, the winding and rewinding at the time of ordinary photographing. When the motor rotates in one direction to feed the film, the first gear train is driven and the winding shaft is driven. At the same time, the second gear train is also driven, the planet gear is meshed with one driven gear, the fork member is rotated, and the film is sent out. Then, when the film is sent out and wound on the winding shaft, due to the high winding speed of the winding shaft, the one driven clutch and the fork member are disconnected from each other by the one-way clutch existing therebetween. The fork member will rotate in the closed state. This is the same when winding up after a normal shooting.

At the time of rewinding, the motor is rotated in the direction opposite to the direction described above. Then, the one-way clutch of the first gear train brings the connection into a disconnected state. The other planetary gear of the second gear train meshes with another gear train, and the fork member is rotated in the rewinding direction to rewind the film.

FIG. 1 shows an embodiment of the present invention and is a block diagram showing an overall circuit configuration of a camera to which a film feeding apparatus is applied. However, in order to simplify the explanation, in FIG. 1, for film feeding, bar code reading,
Only the circuit and mechanism for magnetic recording are shown.

In FIG. 1, the center of the circuit of the camera is a CPU 10, and circuits and mechanisms for performing various camera operations are arranged around the CPU 10. And, these circuits and mechanisms, as described below,
It operates according to an instruction from the PU 10 and provides information to the CPU 10.

Input ports I1, I2 and I of the CPU 10
A third release switch (1st release SW) 11, a second release switch (2st release SW) 12, and a storage chamber cover switch (SW) 13 are connected to 3.

The input port I4 of the CPU 10 is
I5 and the output ports O1 and O2 are respectively provided with a distance measuring circuit 14, a photometric circuit 15, a focusing circuit 16, and a shutter /
A diaphragm control circuit 17 is connected.

The distance measuring circuit 14 measures the distance to the subject and inputs the measured distance information to the CPU 10 via the input port I4. In addition, the photometric circuit 15
The object brightness is measured and the measured brightness information is input to the CPU 10 via the input port I5.

The CPU 10 controls the shutter / aperture control circuit 17 in accordance with the brightness information input from the photometry circuit 15 to execute the exposure operation, and the focus adjustment circuit 16 in accordance with the distance information from the distance measurement circuit 14. To perform the focus adjustment operation.

This focus adjustment operation is executed when the CPU 10 detects via the input port I1 that the first release switch 11 which is turned on in synchronization with the half-press of the release button by the photographer is turned on. . Also, the above exposure operation is performed when the photographer fully presses the release button.
Second release switch 12 that turns on in conjunction with this
Is turned on when the CPU 10 detects via the input port I2.

The accommodation chamber lid switch 13 is a switch which is turned on when a film cartridge 22 described later is loaded into an accommodation chamber of a camera body (not shown) and the lid of the accommodation chamber is closed. This storage chamber lid switch 1
When 3 is turned on, the feeding operation of the film 12 is started.

Output ports O3 and O5 of the CPU 10
A switching circuit 19 and a voltage setting circuit 20 in the motor drive circuit 18 are connected to the. The film feeding motor 21 is driven by the motor drive circuit 18. The voltage setting circuit 20 is a circuit for switching the driving speed of the film feeding motor 21, and the CPU
When the signal for instructing the low speed driving is received from 10, the film feeding motor 21 is provided with the voltage (about 20 to 30% lower) for the low speed driving.

The driving force of the film feeding motor 21 is transmitted to the film cartridge 22 and the take-up spool 23. The film 24 wound in the film cartridge 22 is sent out of the film cartridge 22 by rotating a spool shaft (not shown) in the film cartridge 22.

This feeding operation is performed by the film feeding motor 21 and a driving mechanism (not shown) for rotating the spool shaft by its driving force. When the film 24 sent out reaches the take-up spool 23,
The take-up spool 23 is taken up. Peripheral speed V1 at which the film 24 is sent out from the film cartridge 22
Since the peripheral speed V2 at the time of winding by the take-up spool 23 is normally set to V1 <V2, after the film 24 is wound around the take-up spool 23, the take-up spool 23
Thus, the film 24 is fed.

On one surface of the film cartridge 22, there is provided a disc 25 which is interlocked with the rotation of the spool shaft described above. On the disk 25, a bar code 26 is printed in which information regarding the characteristics of the film 24 and the film cartridge 22 is coded. If the bar code 26 is discriminated, it is possible to obtain the film sensitivity information, the number of photographed frames information, the negative / positive information and the like. Also,
Depending on the initial position, it is also possible to detect the exposure state of the film 24, that is, whether or not the built-in film has already been exposed.

In order to read this bar code information, the disk 25, that is, the spool shaft described above, is used for the film 2.
The photo sensor 27 detects while rotating in the direction opposite to the feeding direction of No. 4. The photo sensor 27 is provided above the disk 18, and is composed of a photo reflector that projects light onto the disk 25 and receives the reflected light.
It is possible to detect a change in the reflected light amount caused by the presence or absence of the barcode 26.

The analog output read by the photo sensor 27 is converted into a digital pulse by the bar code detection circuit 28 and input to the CUP 10 via the input port I7. The CPU 10 decodes this digital pulse to determine the above-mentioned information.

Further, the film 24 has a magnetic recording portion (not shown) extending in the longitudinal direction thereof, and photographing information and the like can be recorded in this magnetic recording portion. This magnetic recording is recorded by a magnetic head 29 provided so as to contact the film 24 wound between the film cartridge 22 and the winding spool 23. A magnetic recording signal is supplied to the magnetic head 29 from the output port O4 of the CPU 10 via the magnetic head drive circuit 30.

The magnetic head 29 and the take-up spool 23
A driven roller 31 is arranged at a predetermined position between the two. The driven roller 31 supplies the movement of the film 24 in contact with the encoder plate 32. Then, information is supplied from the photosensor 33 arranged on the encoder plate 32 to the input port I6 of the CPU 10 via the feeding state detection circuit 34.

The CPU 10 synchronizes with the film feeding pulse input to the input port I6 and outputs it to the output port O4.
A magnetic recording signal is supplied to the magnetic head drive circuit 30 via the. Then, when the magnetic head drive circuit 30 receives the signal and drives the magnetic head 29, the photographing information is recorded in the magnetic recording portion of the film 24.

The feeding system of the film 24 is
A driven roller 31 that follows, an encoder plate 32 that interlocks with the driven roller 31, a photo sensor 33 that detects a slit provided on the encoder plate 32, and an analog output of the photo sensor 33 is converted into a digital pulse. It is composed of a feeding state detection circuit 34. And
The CPU 10 receives the digital pulse from the feeding state detection circuit 34 via the input port I6, and counts the number of digital pulses to detect the feeding amount of the film 24.

Next, the film feeding operation of the camera constructed as shown in FIG. 1 will be described with reference to FIGS.
When the CPU 1 detects that the storage chamber cover switch 2 is turned on, the CPU 1 executes the autoloading routine of FIG.

When the CPU 10 detects that the accommodation chamber lid switch 13 is turned on, it executes the autoloading routine shown in FIG. First, by driving the film feeding motor 21 in the reverse direction, the spool shaft in the film cartridge 22 is rotated in the non-feeding direction, and the bar code information is read as described above (step S1). Then, it is determined whether or not the initial position of the bar code is at the position indicating the unexposed state (step S2). Here, if it is not unexposed, a warning is given (step S3), and then the process returns to the main routine not shown.

On the other hand, if it is not exposed in step S2, the voltage setting circuit 20 is instructed to drive the film feeding motor 21 at a low voltage (step S4).
Then, the switching circuit 19 is connected to the film feeding motor 22.
Is instructed to rotate normally (step S5).

Next, the feeding amount of the film 24 is monitored by the pulse signal input to the input port I6 (step S6). When the first frame of the film 24 is fed to the exposure position, the film feeding motor 21 is stopped (step S7), and then the process returns.

Further, in the winding operation after photographing, the one frame winding routine of FIG. 3 is executed. First, CPU1
0 instructs the voltage setting circuit 20 to drive at a high voltage (step S11), and then instructs the switching circuit 21 to rotate the film feeding motor 21 in the forward direction. Next, it is determined whether or not one frame has been wound (step S1
3) Yes.

When the winding of one frame is completed, the film feeding motor 21 is stopped (step S).
14). Then, return. The difference between the auto-loading routine of FIG. 2 and the one-frame winding routine of FIG. 3 is that the drive voltage of the film feeding motor 21 is different, that is, the feeding operation of the film 24 and the take-up spool. The winding operation by 23 is performed at low speed, and the winding of one frame after shooting is performed at high speed. By doing so, the film 24 can be securely wound around the winding spool 23 during winding.

FIG. 4 is a modification of the embodiment of the present invention, which is a modification of the flowchart of FIG. That is, it is determined whether or not the loaded film cartridge is a film cartridge having a small number of frames to be photographed, based on the number of frames to be photographed read from the barcode 26 in step S21 (step S24). Then, only in the case of a film cartridge having a small number of frames to be photographed, the process proceeds to step S25, and driving is performed at a low voltage.

The reason for this is that a film cartridge having a small number of frames for photographing shows more noticeable unevenness in running of the film, which has been a problem in the past. As a result, unless the film cartridge has a small number of frames, it is possible to shorten the feeding and winding operations.

In the flow chart of FIG. 4, steps S21, S22, S23 and steps S25, S2.
Since steps 6 and S27 are the same as the operations of steps S1, S2, S3 and steps S4, S6, S7 of the flowchart of FIG. 2, respectively, description thereof will be omitted.

According to the above embodiment of the present invention, the following constitution can be obtained. (1) A film feeding device for a camera, which comprises a magnetic head for magnetic recording, which contains a film with a magnetic track, and which includes a film cartridge information display for displaying the number of recordable frames of the film. Information reading means for reading the information on the number of photographable frames from the cartridge, driving means for loading and winding the film, and a winding means for winding the film by a driving force of the driving means including a winding spool. Magnetic recording means for magnetically recording on a magnetic track of the film during film winding, and when the number of photographable frames read when the cartridge is loaded is less than a predetermined value,
And a film feeding means for feeding the film leader portion from the cartridge at a speed lower than the film winding speed by the winding means by the driving force of the driving means to wind the leader portion around the winding spool. Film feeding device.

[0046]

As described above, according to the present invention, when the film is fed from the film cartridge, the feeding speed is made lower than the normal winding speed to ensure the winding state of the film. The accuracy of recording can be improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a block diagram showing an overall circuit configuration of a camera to which a film feeding device is applied.

FIG. 2 is a flowchart for explaining a film feeding operation of the camera having the configuration of FIG. 1 and a flowchart for explaining an autoloading operation.

3 is a flow chart for explaining a film feeding operation of the camera having the configuration of FIG. 1 and for explaining an operation of winding one frame.

FIG. 4 is a flowchart illustrating an operation of autoloading in a modification of the embodiment of the present invention.

FIG. 5 is a graph showing the characteristics of a conventional film feeding device, and is a graph showing a current flowing through a film winding motor and a pulse indicating a film traveling.

[Explanation of symbols]

10 ... CPU, 11 ... First release switch (1
st release SW), 12 ... Second release switch (2nd release SW), 13 ... Accommodation chamber lid switch (S
W), 14 ... Distance measuring circuit, 15 ... Photometric circuit, 16 ... Focus adjusting circuit, 17 ... Shutter / aperture control circuit, 18 ... Motor drive circuit, 19 ... Switching circuit, 20 ... Voltage setting circuit, 21 ... Film feeding Motor, 22 ... Film cartridge, 23 ... Take-up spool, 24 ... Film, 25
... disk, 26 ... bar code, 27, 33 ... photo sensor, 28 ... bar code detecting circuit, 29 ... magnetic head, 3
0 ... Magnetic head drive circuit, 31 ... Followed roller, 32 ... Encoder plate, 34 ... Feeding state detection circuit.

Claims (2)

[Claims] 1. A film feeding device for a camera using a film cartridge having a magnetic head for magnetic recording and containing a film with a magnetic track, the driving means for loading and winding the film. A winding means for winding the film by the driving force of the driving means, and a film leader portion from the cartridge by the driving force of the driving means when the cartridge is loaded, and a film winding speed by the winding means. A film feeding device for feeding the leader portion around the winding spool at a speed lower than that of the film feeding device. 2. A film feeding device for a camera equipped with a magnetic head, which uses a film cartridge containing a film with a magnetic recording portion, and drives the driving means and the driving force of the driving means to load the film. A speed at which the winding means winds the film in order to feed the film from the film cartridge and further feed the film to the winding means side by receiving the driving force of the winding means and the driving means. The film cartridge is loaded in the camera and then the film is fed at a slower winding speed than the filming speed for each shooting. A film feeding device.