JPH0519340A - Film winding up method for camera - Google Patents

Abstract

PURPOSE:To provide the film winding-up method of a camera that a film can be wound up at a stable feeding speed when the film is wound up. CONSTITUTION:The film is wound up at the stable feeding speed by rotating a cartridge spool 3a in a feeding-out direction so as to prevent the film from being tightly wound to the spool 3a caused by the winding-up until the winding-up of the film is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding method for a camera using a film cartridge which is configured to rotate a cartridge pool in a feed direction so as to feed the film out of the cartridge.

[0002]

2. Description of the Related Art U.S. Pat. No. 4,832,275 discloses a system different from the current 135 type film cartridge. That is, in this film cartridge, the leading end of the film is not exposed from the cartridge at first, and the film is pushed out from the cartridge when the cartridge pool is rotated in the feeding direction after being loaded in the camera.

The present inventor has already filed Japanese Patent Application No. 1-27956.
No. 0 proposes a hoisting / rewinding device for a camera in which a film patrone of this type is loaded. Figure 8
It is a perspective view showing an outline of this device. With this device,
One film feeding motor 1 drives the spool 3a of the cartridge 3 via the drive mechanism 2 and
The take-up spool 5 of the camera is driven via the drive mechanism 4. The gear ratio of these drive mechanism 2 and drive mechanism 4 is
The feeding speed of the film 6 is set to be lower than the peripheral speed of the take-up spool 5. During the initial winding,
That is, until the film 6 is sent out from the cartridge 3 and wound on the take-up spool 5, the film 6 is sent out at a slower speed than the peripheral speed of the take-up spool 5, whereby the film 6 is reliably wound around the take-up spool 5. .. Since the spools 3a and 5 are driven with the same gear ratio even after the leading end of the film 6 is wound around the take-up spool 5, the film 6 is not sent from the patrone 3 by the patrone pool 3a, but by the take-up spool 5. It is pulled out from the Patrone 3.

By the way, in the film cartridge 3, the film 6 spreads outside in the cartridge 3 and then comes out of the cartridge 3 as the cartridge pool 3a rotates during the initial feeding. That is, the film 6 is wound around the cartridge pool 3a. Even after the front end of the film 6 has been wound around the take-up spool 5 during the initial winding, the film 6 in the cartridge 3 is in this loosened state for a while, and the film 6 in the cartridge 3 is fed every time one frame is fed after photographing. The film 6 is gradually wound around the spool 3a. this is,
This is because the gear ratios of the drive mechanisms 2 and 4 are set so that the feeding speed of the film 6 is lower than the peripheral speed of the take-up spool 5, as described above. Then, when the shooting and the one-frame feeding are successively repeated, the film 6 in the cartridge 3 is completely wound around the spool 3a, and thereafter,
The cartridge pool 3 a is not driven via the drive mechanism 2, but is driven by the film 6 pulled out from the cartridge 3. At this time, the rotation speed of the patrolness pool 3a becomes faster than the speed driven by the drive mechanism 2, and the rotation speed of each gear of the drive mechanism 2 is increased via the fork 7. As a result, the one-way clutch 8 in the drive mechanism 2 is disengaged, and the difference in rotation speed between the rotation by the motor 1 and the rotation by the film 6 that is pulled out is absorbed.

[0005]

[Problems to be solved by the invention]
When the film is wound up by the rewinding device, the time until the film is wound up in the patrone pool is the "up-winding period", and the time after it is wound up is the "up-winding period".
If you call and distinguish them, the point of time when these windings are switched between the first half and the second half will change depending on the size and gear ratio of the patrone. For example, in a 36-sheet shooting patrone, the switching time point is near the 10th frame or near the 15th frame.

By the way, as described above, the film 6 is pulled out from the cartridge 3 by the take-up spool 5 in the early period of winding, and the cartridge pool 3a driven by the motor 1 is the film 6 in the cartridge 3.
Therefore, the load on the motor 1 that drives the patrone pool 3a via the drive mechanism 2 is small.

On the other hand, in the latter half of winding, the one-way clutch 8 disconnects the clutch 8 from the patrone pool 3a, so that the load on the drive mechanism 2 of the motor 1 is further reduced. However, at this time, the film 6 wound around the patrone pool 3a drives the spool 3a to the one-way clutch 8 and these become a load of the motor 1 via the take-up spool 5 and the drive mechanism 4.

As described above, when the load of the motor 1 in the first and second stages of winding is comprehensively observed, the load of the motor 1 in the latter stage of winding is larger than that in the first period. The increase in the motor load during the winding lowers the rotation speed, which lowers the film feeding speed. In particular, when using a battery that has a short lifespan, even if the load is light at the beginning of winding and it operates normally, there is a risk that the winding speed will decrease abnormally in the latter half of winding and it may interfere with the continuation of shooting. is there.

Therefore, when the film is wound by the conventional winding / rewinding device, the operability and reliability of the camera are deteriorated, and the winding speed is unstable when the information is recorded on the film at the time of winding. As a result, the information recording density fluctuates, and the reliability of recorded information is impaired.

An object of the present invention is to provide a film winding method for a camera, which can wind the film at a stable feeding speed when winding the film.

[0011]

The present invention will be described with reference to FIGS. 1 and 2 showing an embodiment. In the present invention, the film 6 is sent out from the patrone 3 by rotating the patrone pool 3a in the sending direction. In addition, it is applied to a film winding method of a camera that winds a film 6 by a take-up spool 5 of the camera for each shooting, and prevents the film from being wound around the patrone pool 3a by the winding until the shooting of all the shooting frames is completed. By rotating the patrone pool 3a in the delivery direction, the above object is achieved.

In the section of means for solving the above problems,
Although the drawings of the embodiments are used to make the present invention easy to understand,
Therefore, the present invention is not limited to the embodiments.

[0013]

1 is a block diagram showing the overall construction of an embodiment of the present invention, and FIG. 2 is a perspective view showing a hoisting / rewinding mechanism portion of a camera according to the present invention. First, the winding / rewinding mechanism of the camera will be described with reference to FIG. It should be noted that the same components as those in FIG. 8 showing the conventional example are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 10 denotes a first motor, which drives the patrone pool 3 a via the first drive mechanism 11. The first drive mechanism 11 is the first motor 10
A planetary mechanism 12 including a gear 10a fixed to a rotary shaft of the gear, a gear 12a, a planetary arm 12b, and a planetary gear 12c.
A gear 13 that meshes with the planetary gear 12c when the film is fed, a gear 14 that meshes with the planetary gear 12c when the film is rewound, and a patrone pool drive gear 15
And a fork 7 fixed to the gear 15.

A second motor 17 drives the take-up spool 5 via a second drive mechanism 18. This second
The drive mechanism 18 of the second planetary mechanism 2 includes a gear 17a fixed to the rotation shaft of the second motor 17, a gear train 19, a gear 20a, a planetary arm 20b, and a planetary gear 20c.
0, gears 21 and 22, and a spool gear 23 that rotates integrally with the take-up spool 5.

A film pressing roller 16 is biased by a spring (not shown) and pressed against the take-up spool 5. When the tip of the film 6 reaches the take-up spool 5,
The tip of the film pressing roller 16 is pressed against the take-up spool 5, and the film 6 is pushed onto the take-up spool 5.
Is wrapped around. Then, the film 6 is wound up by the rotation of the take-up spool 5.

Reference numeral 24 is a photoelectric film encoder for detecting the feeding amount of the film 6. When the film 6 passes the detection roller 24a, the roller 24a rotates, which causes the slit plate 24b attached to the detection roller 24a to rotate. The slit plate 24b intermittently interrupts the light beam of the photoelectric converter 24c integrally formed with the light emitter / receiver in proportion to the rotation speed thereof. The photoelectric converter 24c converts the optical pulse signal generated by the rotation of the slit plate 24b into an electric pulse signal and outputs it.

A photoelectric spool encoder 25 detects the rotation angle of the cartridge pool 3a via the fork 7 and the gear 15. Similarly to the film encoder 24 described above, when the patrolness pool 3a rotates, the gear 25a rotates via the fork 7 and the gear 15, and the slit plate 25b attached to this gear 25a.
Also rotates. The slit plate 25b intermittently shields the light beam of the photoelectric converter 25c in proportion to its rotation speed in proportion to its rotation speed. The photoelectric converter 25c converts the optical pulse signal generated by the rotation of the slit plate 25b into an electric pulse signal and outputs it.

Next, the operation of the hoisting / rewinding mechanism shown in FIG. 2 will be described. When the film cartridge 3 is loaded into the camera, the spline 3 of the cartridge pool 3a
b fits in the recess of the fork 7. When the film 6 is fed out, when the first motor 10 is rotated in the F1 direction shown in FIG.
Is driven clockwise, the planetary arm 12b swings clockwise, and the planetary gear 12c meshes with the gear 13. As a result, the rotation of the first motor 10 is changed to the gear 1
0a → gear 12a → planetary gear 12c → gear 13 → gear 1
5, the patrone pool 3a is driven counterclockwise, and the film 6 is sent out from the film patrone 3.

The front end of the film 6 is the film encoder 2
When it is detected by the encoder 24 that it has passed 4, the second motor 17 starts rotating in the F2 direction shown in the figure, that is, the film winding direction. Second motor 17
Rotation of the gear 2 via the gear 17a and the gear train 19
0a is transmitted. The gear 20a rotates counterclockwise,
As a result, the planet arm 20b also swings counterclockwise. As a result, the planet gear 20c meshes with the gear 21. That is, the rotation of the second motor 17 is changed from the gear 17a to the gear train 1
9 → gear 20a → planetary gear 20c → gear 21 → gear 22
→ Spool gear 23 is transmitted in order, and spool gear 23
The take-up spool 5 fixed to the roller rotates in the film winding direction. Then, the tip of the film 6 is pressed against the take-up spool 5 by the film pressing roller 16, and the film 6 is wound around the take-up spool 5. At this time, in order to reliably wind the film 6 around the take-up spool 5, the feed-out speed VF of the film 6 is controlled by the control circuit described later so as to be slightly slower than the peripheral speed VS of the take-up spool 5. ..

Next, when the film is rewound, the first motor 10 is rotated in the R1 direction shown in the drawing, that is, the rewinding direction. As the gear 12a is driven counterclockwise, the planet arm 12b is also rotated. The planetary gear 12c meshes with the gear 14 by swinging counterclockwise. As a result, the rotation of the first motor 10 is changed from the gear 10a → the gear 12a → the planetary gear 1
2c → gear 14 → gear 15 is transmitted in this order, the patrone pool 3a is driven in the clockwise direction, and the film 6 is rewound onto the film patrone 3.

Prior to the film rewinding, the control circuit to be described later activates the second motor 17 in the R2 direction in the figure for a certain period of time to swing the planetary arm 20b clockwise to engage the planetary gears 20c and 21. The operation of removing is performed. This can prevent the second motor 17 from being rotated by the first motor 10 when the film is rewound.

Next, referring to FIG. 1, the overall construction of the camera winding / rewinding device of the present invention will be described. The same components as those of the mechanical section shown in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. 31 is a drive circuit for driving the first motor 10, 32 is a drive circuit for driving the second motor 17,
T1 and T2 are timers, and C1 is a film counter for counting the number of film winding frames. Reference numeral 33 is a photometric device, which measures the inside of the photographing screen and outputs luminance information. 34
Is a distance measuring device, which detects a focus adjustment state of a photographing optical system (not shown) and outputs focus detection information. Reference numeral 35 denotes a photographing control device, which controls the shutter mechanism section and the diaphragm mechanism section.

Further, SW1 is a switch which is turned on when the shutter release is pressed halfway, and SW2 is a switch which is turned on when the shutter release is fully pressed. Reference numeral 36 denotes a control circuit, which is composed of a microcomputer and its peripheral components, and executes a film winding / rewinding control program described later to wind up / rewind the film 6.

Next, a film winding method by the winding / rewinding device of this embodiment will be described. In this embodiment, when one frame is advanced after photographing each photographing frame,
At the same time as the film 6 is wound up by the take-up spool 5 by driving the motor 17 of the above, the first motor 10 is driven to rotate the patrone pool 3a in the direction F3 by a predetermined amount, and the film 6 is stored in the patrone 3 in the patrone pool 3a. Always keep a loose condition against.

FIG. 3 shows that when the initial winding is completed, that is, when the loaded film 6 is sent out from the cartridge 3 and wound on the take-up spool 5, the first frame is completely aligned with a predetermined photographing position. The state of the film 6 in the cartridge 3 of FIG. In the figure, the thickness of the film 6 is ignored, and the film 6 is indicated by the center line in the thickness direction.

Also, in this embodiment, the first and second motors 10 and 17 are controlled as follows when the film 6 is initially wound. After the cartridge 3 is loaded, the first motor 10 is started in the film feeding direction to feed the film 6, and when the leading end reaches the take-up spool 5, the first motor 10 is stopped. Next, the second motor 17
Is started to pull out the film 6 from the cartridge 3, and when the first frame reaches a predetermined photographing position, the second motor 17 is stopped. Therefore, the film 6 in the cartridge 3 is completely unwound when the driving of the first motor 10 is finished, but when the second motor 17 is driven thereafter, the first motor 10 is not driven. , Second motor 1
At the time when driving of 7 is completed, the film is slightly wound around the cartridge pool 3a, that is, the outermost diameter of the film 6 in the cartridge 3 is slightly reduced.

The patrolness pool 3a is fed out every time one frame is fed after photographing so that the gap between the patrone pool 3a at the end of the initial winding and the innermost diameter portion of the film 6 does not change until the photographing of all photographed frames is finished. Rotate to. That is, the rotation angle of the fork 7 is controlled.

In FIG. 3, assuming that the film 6 is tightly wound in a spiral shape, the radius r of the thickness center of the outermost film at the position of the angle θ (radian) from the feeding point A of the film 6 is given by the following equation. Shown. r = r1- (θ / 2π) · t ··· (1) L = r1 · θ- (t / 4π) θ 2 ··· (2) where, r1: the thickness of the outermost film at point A Center radius L: Outermost film length between points A to θ t: Film thickness π: Circularity

When the above equation (2) is solved for θ under the condition that θ ≧ 0, θ = (2π / t) · (r1− (r1 ² − (tL / π)) ^1/2 ) (3) ) Is obtained. As is apparent from FIG. 3, when the film 6 is pulled out by the length L at the time of feeding one frame, and at the same time, the patrone pool 3a is rotated by θ in the F3 direction, the gap between the patrone pool 3a and the innermost diameter portion of the film 6 is formed. The size does not change. For example, when the first frame is exposed after the initial winding and the first frame is fed to position the second frame at a predetermined photographing position, L = screen pitch P (3)
The angle θ may be obtained from the equation, and the first motor 10 may be driven by this θ to rotate the fork 7, that is, the patrone pool 3a. Similarly, the angle θn for rotating the fork 7 is (3) when feeding one frame after the exposure of the nth frame.
It is calculated by the following equation using the equation. θn = θ (L = P · n) −θ (L = P · (n−1)) (4) where θ (L = P · n) is obtained by using the equation (3) as L = P · represents θ obtained as n. Similarly, θ (L = P · (n−1)) represents θ obtained by the equation (3) as L = P · (n−1).

FIG. 4 is a flow chart showing a main program for controlling film winding and rewinding. The hoisting / rewinding operation will be described with reference to this flowchart. The control circuit 36 starts execution of this program when the film cartridge 3 is loaded and the back cover of the camera is closed. First, in step S1, it is determined whether or not the shutter release is half-pressed by the switch SW1, and the same step is repeated until the shutter release is half-pressed. When the button is half-pressed, the process proceeds to step S2, and the initial winding subroutine shown in FIG. 5 is executed.

In step S20 of FIG. 5, the first motor 10 is started in the film feeding direction F1 to start feeding the film 6. In a succeeding step S21, it is determined by the film encoder 24 whether or not the leading end of the film 6 has been fed until it reaches the take-up spool 5.
Repeat the steps until reaching. When the leading end of the film 6 reaches the take-up spool 5, the process proceeds to step S22, and the first motor 10 is stopped. Next, in step S23, the first motor 17 is activated in the winding direction F2 to start winding the film 6. In step S24, the film encoder 24 determines whether or not the first frame of the film 6 has reached a predetermined shooting position, and the same steps are repeated until the first shooting position is reached. When the first frame reaches the shooting position, the process proceeds to step S25, and the second motor 17 is stopped. Then, in step S26, the film counter C1 is set to "1" and the process returns to the main program.

When the initial winding is completed, the process proceeds to step S3 in FIG. 4, and it is determined whether or not the shutter release has been half-pushed by the switch SW1, and the same step is repeated until it is half-pushed. When the shutter release is pressed halfway, the process proceeds to step S4, and the distance measuring device 34 and the photometric device 33 perform the distance measuring / photometric operation. Next, in step S5, it is determined whether or not the shutter release has been fully pressed by the switch SW2, and steps S3 to S5 are repeated until the shutter release is fully pressed. When the shutter release is fully pressed, the process proceeds to step S6, and the photographing control device 35 performs the photographing operation.

In step S7 after the first frame has been photographed, the one frame feed subroutine shown in FIG. 6 is executed. In step S70 of FIG. 6, the required rotation angle θn of the fork 7 is calculated by substituting the number n of frames of the film counter C1 into the above equation (4). Then, in step S71, the second
The motor 17 is started in the winding direction F2, and in step S72, the first motor 10 is started in the feeding direction F1. In the following step S73, the film encoder 24 determines whether or not the film feeding for one frame is completed. If completed, the process proceeds to step S74 to stop the second motor 17 and set the flag M2. .. Next, in step S75, it is determined by the spool encoder 25 whether the fork 7 has completed rotation by the required rotation angle θn calculated in the above step, and if completed, the process proceeds to step S76 to stop the first motor 10. At the same time, the flag M1 is set. In a succeeding step S77, it is determined whether or not the flags M1 and M2 are both set, that is, whether or not the film feeding for one frame and the rotation of the fork 7 are completed, and if either is not completed, the step S73 is executed again. Return to step S78, and if both are completed, go to step S78. Step S7
In step 8, the flags M1 and M2 are reset, and then step S
At 79, the film counter C1 is incremented and the process returns to the main program.

When one frame has been fed, it is determined in step S8 of FIG. 4 whether or not the last frame has been photographed. If not, the process returns to step S3 and the above-described processing is performed on the next frame. When the photographing of the last frame is completed, the process proceeds to step S9, and the rewinding subroutine shown in FIG. 7 is executed. The timer T1 is started in step S90 of FIG. 7, and the second motor 17 is started in the rewinding direction R2 in subsequent step S91. As described above, this is because the second motor 17 causes the first motor 1 to rewind during film rewinding.
This is because the planetary gear 20c and the gear 21 are disengaged from each other so that the load is not zero. Therefore, the timer T1 is set to a time period for which the mesh between the planetary gear 20c and the gear 21 is surely disengaged. In step S92, the driving of the second motor 17 is continued until the timer T1 times out, and after the time is up, the process proceeds to step S93 to stop the second motor 17. Next, step S94.
Then, the first motor 10 is started in the rewinding direction R1 to start rewinding the film 6. Then, step S9
In step 5, it is judged whether or not there is a pulse signal from the film encoder 24, and the same steps are repeated until there is no pulse signal. If there is no pulse signal, the process proceeds to step S96, and the timer T2 is started. That is, when the leading edge of the film 6 passes through the film encoder 24 and the output signal disappears, the timer T2 is started, and the rewinding drive of the first motor 10 is performed for a predetermined time T2 until the timer T2 times out in step S97. Continuing, the film 6 is completely rewound onto the cartridge 3. When the timer T2 times out in step S97, the process proceeds to step S98 to stop the first motor 10 and return to the main program. When the above output is completed, the program execution ends.

As described above, when the first frame of the film 6 is set at a predetermined photographing position, the size of the gap between the innermost diameter portion of the film 6 and the patrone pool 3a is not changed. The fork rotation angle θn is calculated each time one frame is fed after the exposure of the photographing frame is completed, and the first motor 10 is driven in the film feeding direction so as to rotate by the angle θn, so that the photographing of all the photographing frames is completed. By the time the film is wound up, the film 6 is not tightly wound around the patrone pool 3a. Therefore, the load of the second motor 17 becomes almost constant until the shooting of all the shooting frames is completed, and the film winding speed is stable. The operability and reliability of the camera are improved.

In the above embodiment, since the film 6 is wound by the take-up spool 5 and the fork 7 is rotated at the same time when feeding one frame, the time for feeding one frame is not lengthened and the film can be wound reasonably. ..

Further, in a camera which magnetically or optically records or reproduces various photographing information on a film at the time of advancing one frame after photographing, according to the above-mentioned winding method, the film feeding speed during the winding is stable. Therefore, reliability at the time of recording or reproducing information is improved.

In the above embodiment, the fork 7 is rotated at the same time when the film is fed by one frame, but the fork 7 may be rotated before or after the one frame is fed.

Further, in the above embodiment, the fork 7 is rotated by the rotation angle θn calculated by the equation (4) when the film is advanced by one frame. However, the invention is not limited to such a method and all the frames can be imaged. Any method may be used as long as the film 6 can be kept wound and loosened around the patrone pool 3a until the end. For example, the forks 7 may not be rotated for each frame feed, but may be collectively rotated for each frame feed. Further, the forks 7 may be collectively rotated at least once until the photographing of all the photographing frames is completed so that the forks 7 are not tightly wound.

In the above embodiment, the patrone pool and the take-up spool are driven by different motors, but the present invention can be applied to the case where both spools are driven by one motor. That is, a speed change mechanism and an electromagnetic clutch are provided in the drive mechanism of the patrone pool, and the patrone pool is normally driven at a gear ratio on the side where the film feeding speed is slower than the peripheral speed of the take-up spool, as described above. And after the initial winding, 1
It is also possible to switch the gear ratio so that the feeding speed is increased by the electromagnetic clutch after every frame feeding or every few frames feeding so as to drive the patrone pool so that the film is not wound around the patrone pool. Alternatively, the transmission mechanism and the electromagnetic clutch are not provided in the patrolness pool drive mechanism, but the take-up spool drive mechanism is provided with a clutch, and the take-up spool is separated by the clutch before or after every one frame feed or every few frame feeds to separate the patrone pool May be driven in the delivery direction.

In the one-frame feeding subroutine shown in FIG. 6, the fork 7 is rotated at the same time when the film is fed by one frame. A method of rotating the fork 7 after the one-frame feeding of the film is completed will be described with reference to the flowchart of FIG. In step S101 of FIG. 9, the second motor 17 is wound in the winding direction F.
In step S102, the film encoder 24 determines whether or not one frame of film has been fed. When completed, the flow advances to step S103 to stop the second motor 17. In step S104, the required rotation angle θn of the fork 7 is calculated by substituting the number n of frames of the film counter C1 into the above equation (4), and in the following step S105, the first motor 10 is started in the feed direction F1. .. In step S106, the spool encoder 2
It is determined by 5 whether or not the fork 7 has rotated by the required rotation angle θn calculated in the above step. When the rotation is completed, the process proceeds to step S107, and the first motor 10 is stopped. In step S108, the film counter C1 is incremented and the process returns to the main program.

The fork 7 is fed before the next frame of film is fed.
Can also be rotated. In this case, when the film is in close contact with the cartridge 3 and is rolled outward, the cartridge pool 3a cannot be rotated any more. Therefore, for example, the first few frames are fed by one frame without rotating the fork 7. After the film is loosely wound in the cartridge 3, the fork 7 is rotated before feeding one frame each time.

As described above, when the fork 7 is not rotated at every one frame feed but the fork 7 is collectively rotated at every several frame feed, the following procedure is performed. First, the number of unit pieces for rotating the fork 7 is determined in advance. Further, the fork rotation angle θ'according to the number of frames is calculated by the method described above. For example, if the number of unit frames is four and the fork 7 is rotated every four frame feed, the count value of the film counter C1 is a multiple of the unit frame number determined in advance for each frame feed, that is, a multiple of four here. Is determined, and the fork 7 is rotated by the fork rotation angle θ ′ calculated when the determination result is affirmative.

In the above embodiment, an extruding type cartridge was described as an example, but the format of the cartridge is not limited to the above embodiment, and the present invention can be applied to the winding of a general 135 type cartridge, for example. .. That is, as described above, the patrone pool may be rotated along with the winding so that the film is not wound around the patrone pool.

In the above embodiment, an example is shown in which the film is pulled out from the film cartridge and taken up on the take-up spool of the camera every time a picture is taken, but the present invention is not limited to such a camera. The present invention can be applied to the following cases where the film is continuously wound on the take-up spool of the camera. (1) Initial film winding in a prewind type camera in which all film is temporarily wound up on the take-up spool of the camera prior to shooting and then rewound to the film cartridge after each shooting. (2) In a camera that records shooting information such as shooting completion information on a magnetic track on the film for each shooting frame, when the film is being reloaded during shooting, the shooting information of each shooting frame is read and unexposed Preliminary winding to search for pieces.

An example of ensuring an appropriate slack of the film in the film cartridge during such continuous winding is shown below. Since the subject here is how much the fork 7 is rotated in synchronization with the continuously wound film, the description of the control method at the time of each continuous winding is omitted. FIG. 10 is a flowchart showing a film loading program. In step S111, it is determined whether or not the shutter release is pressed halfway by the shutter release half-press switch SW1. If the shutter release is pressed halfway, the process proceeds to step S112, and the first motor 10 is started. Next, in step S113, it is determined whether or not the leading edge of the film has reached the take-up spool 5, and when it reaches, the process proceeds to step S114, and the second motor 17 is activated. In step S115, measurement of the film feed amount L and the fork rotation angle θ is started. Here, the above equation (3) is
Fork 7 when the draw-out amount from the beginning of the film is L
Indicates that it is sufficient to rotate from the initial state to the rotation position of θ. Therefore, L is successively measured during continuous winding, and the rotation of the first motor is controlled so as to reach an angular position corresponding to the film feed amount L. Step S116
Then, the film feed amount L is taken in, and further step S1
At 17, the measured value of the fork rotation angle θ is captured. In step S118, the rotation of the first motor 10 is controlled so that the calculated value and the measured value of the fork rotation angle θ with respect to the film feed amount L match. In step S119, it is determined whether or not the continuous winding is finished, and when it is finished, step S1
In step 20, the first and second motors are stopped, and if the winding is not completed, the process returns to step S116 to repeat the above process.

It should be noted that the fork may be rotated by a rotation angle corresponding to the predetermined length each time the film wound continuously is wound for a predetermined length.

[0048]

As described above, according to the present invention, the patrone pool is rotated in the film feeding direction so that the film is not wound up in the patrone pool due to winding up until the photographing of all the photographing frames is completed. Therefore, the take-up spool always winds the film in a loose state in the cartridge, and the load of the motor that drives the wind-up spool does not suddenly increase during winding, and the film is wound at a stable constant speed. be able to. Therefore, the operability and reliability at the time of film winding are improved, and when recording various shooting information on the film or reproducing the information on the film at the time of film winding, the reliability of the recording and reproduction of information is improved. Is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a winding / rewinding mechanism portion of the camera of the present invention.

FIG. 3 is a view showing a state of the film in the cartridge when the first frame of the film is set at a predetermined photographing position.

FIG. 4 is a flowchart showing an example of a film winding / rewinding control program.

FIG. 5 is a flowchart showing an initial winding subroutine.

FIG. 6 is a flowchart showing a one-frame feed subroutine.

FIG. 7 is a flowchart showing a rewinding subroutine.

FIG. 8 is a perspective view showing a winding / rewinding mechanism portion of a conventional camera.

FIG. 9 is a flowchart showing another one-frame feed subroutine.

FIG. 10 is a flowchart showing a film loading routine.

[Explanation of symbols]

 3 Patrone 3a Patrone Pool 3b Spline 5 Winding Spool 6 Film 7 Fork 10 First Motor 11 First Driving Mechanism 17 Second Motor 18 Second Driving Mechanism 24 Film Encoder 25 Spool Encoder 31 First Motor Driving Circuit 32 second motor drive circuit 36 control circuit

Claims (1)

Claim: What is claimed is: 1. A film winding method for a camera, in which a film is fed from a cartridge by rotating a patrone pool in a feeding direction, and the film is taken up by a take-up spool of the camera for each photographing. A film winding method for a camera, comprising rotating the patrone pool in the feeding direction so as to prevent the film from being wound into the patrone pool by the filming until the filming of the frame is completed.