JPH09189953A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film feeder for a camera capable of surely executing magnetic recording by making the traveling of a film uniform. SOLUTION: In the camera, the film 4 exposed from a film cartridge 2 is taken up by a take-up spool 16 by the driving force of a motor 18. The film 4 is fed from the film cartridge 2 to the take-up spool 16 at a feeding speed slower than a taking up speed by the take-up spool 16 by the driving force of the motor 6. At the time of loading the cartridge 2 in the camera, a CPU 1 controls the motor 6, so as to feed the film 4 at a speed slower than the film feeding speed for each photographing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a film with a magnetic storage section, which has a magnetic head for writing information in a magnetic recording section of the film.

[0002]

2. Description of the Related Art Conventionally, for example, in Japanese Unexamined Patent Publication No. 2-67534, a film rewinding gear is provided in order to rotate a film spool to feed the film out of the cartridge and to easily wind the film on a take-up spool. A technique is disclosed in which the speed reduction ratio of the train is set to be larger than the speed reduction ratio of the film winding gear train (hereinafter, this is referred to as Prior Art 1).

Further, Japanese Patent Application Laid-Open No. 4-128732 discloses a technique of detecting a moving amount of a film by a roller and writing magnetic information on the film based on the moving amount (hereinafter, referred to as Prior Art 2). And). And
A technique for accurately writing magnetic information in the magnetic information storage portion of a film has been studied by combining the techniques of the preceding examples 1 and 2.

[0004]

However, when the magnetic information is written on the film by using the above-mentioned conventional technique, the film traveling (traveling amount, traveling speed) particularly from the film loading to the shooting start frame and the initial shooting frame is performed. Irregularity does not occur and normal writing is not performed. It is considered that this is because the film wound on the take-up spool moves relatively during the take-up rotation. In other words, the film is not completely wrapped around the spool.

Here, FIG. 5 shows data obtained by conducting an experiment with the same apparatus as the first embodiment according to the above prior art example 1, and is a diagram showing that this phenomenon is captured. FIG. 5 (a) shows the current flowing in the film winding motor, and FIG. 5 (b) shows the pulses relating to the running of the film.
In the graph showing the film running, there are many portions where the pulse width is not uniform. This indicates that the film running itself is not running uniformly.

Further, the data shown in FIG. 5 is the case of the first embodiment according to the above-mentioned first example, but similarly the film feeding system as in the first example is added to the second example of the same publication. When the film is wound on the take-up shaft, the film speed on the take-up shaft is faster than that on the rewind shaft. Even when it is set, it is considered that the winding unevenness like the above data may occur.

The present invention has been made in view of the above problems, and an object of the present invention is to feed a film at a speed slower than the feeding speed of the film winding at the time of normal photographing at the time of idling. By firmly winding the film around the take-up shaft, the film travels uniformly, and as a result, magnetic recording is surely performed.

[0008]

In order to achieve the above object, a camera according to a first aspect of the present invention is a camera using a film cartridge containing a film having a magnetic storage unit, wherein a first drive source is used. And a second drive source,
A film winding means driven to wind the film exposed from the film cartridge by the driving force of the first driving source, and a winding means from the film cartridge by the driving force of the second driving source. When the film is fed to the camera, the film feeding means and the film cartridge are driven so as to feed the film toward, and the feeding speed is set to be slower than the winding speed by the film winding means. A control means for controlling the second drive source so that the film is fed out at a speed lower than the film feeding speed for each photographing.

The camera according to the second aspect uses a film cartridge in which a film having a magnetic storage unit is contained, and a film feeding means for feeding the film from the film cartridge, and a film for winding the fed film. In a camera having winding means, a first driving source for driving the film winding means, a second driving source for driving the film feeding means, and a winding speed by the film winding means during normal photographing. The second drive source is controlled so that the feeding speed by the film feeding means is slowed down, and when the film cartridge is loaded in the camera, the film is fed slower than the film feeding speed for each photographing so that the film is idly fed. A control means for controlling the second drive source so as to operate. The features.

Further, the camera according to the third aspect is a camera using a film cartridge containing a film having a magnetic storage unit, and a film feeding means for feeding a film from the film cartridge, and a film feeding means for feeding the film from the film cartridge. Winding means for winding the film, and first driving means for driving the film winding means.
The drive source, the second drive source for driving the film feeding means, and the idling operation immediately after the film cartridge is loaded in the camera, the film is fed out at a speed slower than the film feeding speed for each photographing. And a control means for controlling the second drive source.

The above-described first and second aspects have the following effects. That is, in the camera according to the first aspect of the present invention, the film winding means winds the film exposed from the film cartridge by the driving force of the first driving source, and the film feeding means drives the second driving source. By force, the film is fed from the film cartridge toward the winding means at a feeding speed slower than the winding speed by the film winding means, and when the film cartridge is loaded into the camera by the control means, The second drive source is controlled so that the film is fed out at a speed slower than the film feeding speed for each photographing.

In the camera according to the second aspect, the film winding means is driven by the first driving source, the film feeding means is driven by the second driving source, and the film winding means is used by the control means during normal photographing. The second drive source is controlled so that the feeding speed by the film feeding means is slower than the take-up speed by the film feeding speed, and when the film cartridge is loaded in the camera, the second feeding source is slower than the film feeding speed for each photographing. The second drive source is controlled so as to perform the idling operation by feeding the film.

Further, in the camera according to the third aspect, the film is sent out from the film cartridge by the film sending means, the film sent out from the film cartridge is taken up by the winding means, and the film is wound by the first drive source. The film feeding means is driven by the second driving source, and the control means drives the film feeding means at the idle feeding operation immediately after the film cartridge is loaded into the camera. The second drive source is controlled to feed the film.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION First, a technique which is a prerequisite for deepening the understanding of the present invention will be described. In the present invention, as the mechanical structure of the film feeding mechanism, the above-mentioned JP-A-2-675 is used.
The technique disclosed in Japanese Laid-Open Patent Publication No. 34-34 (described as a second embodiment in the same publication) is used.

That is, motors are provided as two drive sources for driving the film winding shaft (winding spool) and the rewinding shaft, respectively. The winding shaft and the motor are connected via a one-way clutch, and when the motor rotates the winding shaft in the film winding direction, the driving force is transmitted to the winding shaft and the winding shaft moves in the rewinding direction. When rotated, the connection between the motor and the winding shaft is broken.

The other motor is connected to a fork member as a rewinding shaft, and rotation of this motor in one direction feeds the film, and rotation in the other direction rewinds the film. The film winding speed of the winding shaft is set to be faster than the film feeding speed of the rewinding shaft.

Now, the idle feeding of the film by the film feeding mechanism having such a structure, and the winding and rewinding at the time of ordinary photographing will be described. When the motor of the winding shaft is rotated so that the winding shaft winds the film, and the motor of the rewinding shaft is rotated so that the fork member feeds the film, the film is fed from the cartridge to the winding shaft side. Then, the film is wound on the winding shaft. At this time, since the film winding speed of the winding shaft is set to be higher than the film feeding speed, the film is reliably wound onto the winding shaft.

On the other hand, at the time of rewinding the film, the motor for rewinding may be rotated in the opposite direction to that at the time of feeding the film to wind the film on the rewinding shaft. At this time, the winding shaft is disconnected from the winding motor due to the one-way clutch, so that the film can be freely wound around the rewinding shaft.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a camera to which the present invention is applied. In FIG. 1, circuits and mechanisms for performing various camera operations are arranged around the CPU 1 that controls the entire operation. However, here, in order to simplify the explanation, a film feeding system and a bar code reading system,
Only the magnetic recording system is shown.

To the input port I1 of the CPU 1, there is connected a switch 3 which is turned on when the film cartridge 2 is loaded in a housing chamber (not shown) of the camera body and the lid is closed. The switch 3 is turned on. Then, the CPU 1 starts the feeding operation of the film 4. Film 4 wound on a spool (not shown) in the film cartridge 2
Are sent out of the cartridge when the spool is rotated. That is, when the CPU 1 sends a control signal to the motor drive circuit 5 via the output port O1, the motor drive circuit 5 receives the control signal and supplies a drive current to the motor 6. As a result, the motor 6 is driven, the driving force of the motor 6 is transmitted to the spool in the film cartridge 2 via the transmission mechanism 7, and the spool rotates in the film feeding direction.

Further, a voltage setting circuit 12 is connected to the motor drive circuit 5 so that the voltage applied to the motor 6 (and consequently the drive current) can be adjusted. C
When PU1 sends a control signal to the voltage setting circuit 12 through the output port O2, the voltage setting circuit 12 receives the signal and changes the voltage applied to the motor 6 to a high voltage (power supply voltage) or a low voltage (about 70% of the power supply voltage). %). This allows film 4
Can be set to two types.

The film cartridge 2 is provided with a disk 8 which is interlocked with the rotation of the spool shaft described above, and a bar code 9 is printed on the disk 8. The bar code 9 encodes information on the characteristics of the film 4 and the film cartridge 2, and if the bar code 9 is discriminated, film sensitivity information, information on the number of frames taken, negative / positive information, etc. can be obtained. . The exposure state of the film 4 can also be detected depending on its initial position. That is, if the film 4 is internally provided, it is possible to detect whether or not the film 4 has already been exposed.

In order to read the information of the bar code 9, the CPU 1 loads the disk 8 (the spool) into the film 4
Bar code sensor 1 while rotating in the opposite direction
0 is detected. The bar code sensor 10 projects a light onto the disk 8 and detects a change in the amount of reflected light caused by the presence or absence of a bar code by a photo reflector that receives the reflected light. The bar code detection circuit 11 converts the analog output of the bar code sensor 10 into digital pulses and inputs the pulses into the input port I2 of the CPU 1. Then, the CPU 1 decodes this digital pulse to determine the above-mentioned information.

As for the feeding state of the film 4, the roller 13 driven by the film 4, the feeding encoder 14 interlocked with the roller 13, and the analog output from the feeding encoder 14 are converted into digital pulses, and the input port of the CPU 1 is used. It is detected by the feeding state detection circuit 15 input to I3. still,
The feed encoder 14 is composed of a disk having a plurality of slits and a photo interrupter. The CPU 1 detects the feeding amount of the film 4 by counting the digital pulses.

Further, the take-up spool 16 is for taking up the film 4 delivered from the film cartridge 2. The CPU 1 sends a control signal to the motor drive circuit 17 via the output port O3, and the motor drive circuit 17
Receives the signal and supplies a drive current to the motor 18,
The driving force of the motor 18 causes the take-up spool 16 to rotate in the take-up direction via the transmission mechanism 19.

By the way, in the present invention, the speed V1 of the film delivered from the film cartridge 2 and the peripheral speed V2 of the take-up spool 16 satisfy the relationship of V1 <V2. Therefore, the film 4 can be reliably wound around the take-up spool 16. In addition, in order to further increase the certainty, the voltage setting circuit 12 is instructed to drive the motor 6 at a low speed during the autoloading, that is, until the film 4 is fed and wound up to the first frame, whereby the speed is increased. The ratio V2 / V1 is further increased.

The film 4 has a magnetic recording portion (not shown) extending in the longitudinal direction thereof so that photographing information and the like can be recorded. The CPU 1 outputs the output port O in synchronization with the film feeding pulse input to the input port I3.
A magnetic recording signal is supplied to the magnetic head drive circuit 20 via 4. The magnetic head drive circuit 20 receives the signal and drives the magnetic head 21 to record magnetic information in the magnetic recording unit.

The operation relating to the film feeding will be described below with reference to FIGS. 2 and 3. When the CPU 1 detects that the accommodation chamber lid switch 3 is turned on, it executes the autoloading sequence of FIG.

That is, the CPU 1 first drives the motor 6 in the reverse direction to rotate the spool in the film cartridge 2 in the non-sending direction and read the bar code information by the above-mentioned method (step S1). Then, the CPU 1 determines whether or not the initial position of the barcode 9 is at the position indicating the unexposed state (step S2), and if not exposed, returns to the main sequence after a warning (step S3).
4).

On the other hand, if it is not exposed, the CPU 1 instructs the voltage setting circuit 12 to drive the motor 6 at a low voltage (step S5), and then causes the motor driving circuit 5 to rotate the motor 6 normally. Instruct (step S6). As a result, the spool in the film cartridge 2 rotates in the film feeding direction, the film 4 is fed from the film cartridge 2, and when the leading end of the film 4 is connected to the driven roller 13, the film feeding pulse is input to the input port I3 of the CPU 1. Start typing.

When the film feeding pulse is detected in this way (step S7), the CPU 1 then instructs the motor drive circuit 17 to rotate the motor 18 in the normal direction (step S8). When the film 4 reaches the take-up spool 16, the take-up spool 16 is compared with the speed of the film 4.
Since the peripheral speed is faster, the film 4 is wound on the spool 1.
It will be rolled up at 6. In this way, when it is determined that the first frame has reached the photographing position by counting the film feeding pulses (step S9), the CPU 1 causes the motors 6 and 1 to operate.
8 is stopped and the operation is completed (steps S10 to S1).
2).

Next, FIG. 3 is a flow chart showing a sequence of winding one frame. This sequence is performed after shooting. The CPU 1 normally rotates the motor 18 to rotate the take-up spool 16 (step S2).
1). Next, the CPU 1 instructs the voltage setting circuit 12 to apply a high voltage to the motor 6 and causes the motor 6 to rotate normally (steps S22 and S23). After feeding one frame, the motors 6 and 18 are stopped and the process returns (steps S24 to S27). In the autoload of the present embodiment, the normal rotation speed of the motor 6 is set to a low speed from the beginning, but if it is switched to the low speed in conjunction with the start of the normal rotation of the motor 18, the time of the autoload is reduced. Needless to say, can be shortened.

Further, as shown in FIG. 4, in consideration of the fact that the above-mentioned inconvenience is more remarkable in a film cartridge having a smaller number of frames to be photographed, based on the number of frames to be photographed in the read bar code information. When the number of frames to be photographed is small, the low voltage is set (the motor 6 is driven at a low speed), and when it is large, the voltage is set to be high (the motor 6 is driven at a high speed). It is also possible to shorten the time of the picking operation (steps S35 to S3).
7).

According to the above embodiment of the present invention, the following constitution can be obtained. (1) In a camera using a film cartridge containing a film having a magnetic storage unit, a first driving source, a second driving source, and a driving force of the first driving source
A film winding means that is driven to wind the film exposed from the film cartridge;
The film is fed by the driving force of the driving source so as to feed the film from the film cartridge toward the winding means, and the feeding speed is set to be slower than the winding speed of the film winding means. Means and a control means for controlling the second drive source so that when the film cartridge is loaded in the camera, the film is fed out at a speed slower than the film feeding speed for each photographing. camera. (2) A camera which uses a film cartridge containing a film having a magnetic storage unit, and which has film feeding means for feeding the film from the film cartridge and winding means for winding the fed film, A first driving source for driving the film winding means, a second driving source for driving the film feeding means,
During normal shooting, the second drive source is controlled so that the feeding speed by the film feeding means is slower than the winding speed by the film winding means, and when the film cartridge is loaded into the camera, A control means for controlling the second drive source so that the film is fed at a speed slower than the film feeding speed of 1. (3) In a camera using a film cartridge including a film having a magnetic storage unit, a film feeding means for feeding the film from the film cartridge, a winding means for winding the film fed from the film cartridge, A first driving source for driving the film winding means, a second driving source for driving the film feeding means, and a film feeding speed for each photographing in the idling operation immediately after the film cartridge is loaded in the camera. A control means for controlling the second drive source so that the film is fed out later than the latter, and a camera. (4) In the above (1), (2), and (3), the film winding means is a film winding spool provided in the camera body. (5) In the above (1), (2), and (3), the film feeding means is means for rotationally driving the film winding shaft in the film cartridge. (6) In the above (1), (2), and (3), the first
The drive source and the second drive source are independent motors.

[0035]

As described in detail above, according to the present invention,
Since the film is fed at a slower speed than the film take-up speed during normal shooting during idling, the film is firmly wound on the take-up shaft, which ensures uniform magnetic recording and magnetic recording. It is possible to provide a camera to perform.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a camera according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an autoloading sequence of the present invention.

FIG. 3 is a flowchart showing a sequence of winding one frame of the present invention.

FIG. 4 is a flowchart showing a sequence of an improved example of autoloading of the present invention.

FIG. 5 is a diagram showing a problem of the related art.

[Explanation of symbols]

1 ... CPU, 2 ... film storage, 3 ... switch,
4 ... Film, 5 ... Motor drive circuit, 6 ... Motor, 7 ...
Transmission mechanism, 8 ... Disc, 9 ... Bar code, 10 ... Bar code sensor, 11 ... Bar code detection circuit, 12 ... Voltage setting circuit, 13 ... Followed roller, 14 ... Feed encoder, 15
... Feeding state detection circuit, 16 ... Winding spool, 17 ... Motor drive circuit, 18 ... Motor, 19 ... Transmission mechanism, 20 ... Magnetic head drive circuit, 21 ... Magnetic head.

Claims (3)

[Claims] 1. A camera using a film cartridge containing a film having a magnetic storage unit, wherein the film is exposed from the film cartridge by a driving force of a first driving source, a second driving source, and the first driving source. Film winding means driven to wind the film thus wound, and driven by the driving force of the second drive source to feed the film from the film cartridge toward the winding means, When the film feeding means having the feeding speed set to be slower than the winding speed by the winding means and the film cartridge is loaded in the camera,
Control means for controlling the second drive source so that the film is fed out at a speed slower than the film feeding speed for each photographing;
A camera comprising: 2. A camera which uses a film cartridge containing a film having a magnetic storage unit, and which has film feeding means for feeding the film from the film cartridge and winding means for winding the fed film. The first driving source for driving the film winding means, the second driving source for driving the film feeding means, and the feeding speed by the film feeding means is higher than the winding speed by the film winding means during normal photographing. The second drive source is controlled to be slow, and when the film cartridge is loaded into the camera, the film is fed at a slower speed than the film feeding speed for each photographing so that the idling operation is performed. A control means for controlling two driving sources, and a camera. 3. A camera using a film cartridge containing a film having a magnetic storage unit, and film feeding means for feeding the film from the film cartridge, and winding means for winding the film fed from the film cartridge. , A first drive source for driving the film winding means, a second drive source for driving the film feeding means, and a film for each photographing in the idling operation immediately after the film cartridge is loaded in the camera. A control means for controlling the second drive source so that the film is fed out at a speed lower than the feeding speed, the camera.