JPH10161228A - Camera capable of executing magnetic recording/ reproducing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent some photographing data from being magnetically recorded on a frame photographed before a film taken out halfway is loaded by magnetically recording it only on the newly photographed frame when the above- mentioned film is loaded again. SOLUTION: A count means, a film heading means, a photographing information storage means and a magnetic recording control means are constituted of a microcomputer MCU. A magnetic recording/reproducing means is constituted of a magnetic write circuit U4, an amplification circuit U5 and a magnetic head 87. A frame storage means is constituted of an EEPROM. By setting an unexposed frame at a photographing position, a heading action is executed and a frame value obtained when the heading action is finished is stored. When the frame is exposed, the photographing information of the exposed frame is stored. When a film is rewound, the photographing information of the frame exposed this time is read out and magnetically recorded on the respective frames. However, it is not magnetically recorded on the frame being smaller than the heading frame value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a camera capable of magnetically recording / reproducing photographic data for each frame of a film.

[0002]

2. Description of the Related Art Cameras capable of magnetically recording / reproducing various data on a film are known. The data recorded on the film includes shooting data such as shooting date and time, aperture, and shutter speed. All of these data are data determined at the time of taking a picture of the one frame, and are recorded at a position corresponding to the frame on the magnetic track.

Japanese Patent Application Laid-Open No. 6-332065 discloses a camera which measures a moving speed with a photo sensor while feeding a film having two perforations for one frame, and magnetically records at a recording frequency corresponding to the moving speed. Has been proposed.

On the other hand, in a camera that electrically feeds a film, the film is wound up by one frame after photographing, and the film is entirely rewound to the cartridge after photographing of all frames is completed. When magnetically recording photographing data on film with this electric camera, photographing data for all frames determined at the time of exposure is stored in a memory, and the photographing data is collectively stored at a recording position corresponding to each frame when the film is rewound. There is a way to record.

In the above-mentioned electric camera, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Application Laid-Open No. 71433, when a film that has been shot halfway (a halfway taken-out film) is reloaded, data recorded magnetically in each frame is reproduced to determine whether the frame is a shot frame or an unexposed frame. It determines whether the frame is a frame, and feeds the film up to the unexposed frame.

[0006]

However, in the above-described camera, when a film taken halfway through and taken out is reloaded, and an unexposed frame is shot and rewinded,
There is a problem that some data is magnetically recorded not only in a newly shot frame but also in a frame shot before loading.

An object of the present invention is to magnetically record photographing data of all frames at the time of rewinding, and when photographing data is reloaded, the photographing data is magnetically recorded only in a newly photographed frame. It is in.

[0008]

[Means for Solving the Problems]

(1) A first aspect of the present invention provides a feeding unit for feeding a film, an exposing unit for exposing a frame set at a shooting position by the feeding unit, a perforation detecting unit for detecting a perforation of the film, and a perforation. Counting means for adding and counting the number of winding frames when the film is wound by the feeding means and subtracting and counting the number of rewind frames when the film is rewound by the feeding means based on the detection result by the detecting means; Magnetic recording / reproducing means for performing recording and reproduction;
A detecting means for detecting an unexposed frame based on information reproduced by the magnetic recording / reproducing means, and when a film is loaded in the camera, the film is wound by a feeding means while detecting the unexposed frame by the detecting means. Film cueing means for setting the detected unexposed frame to the photographing position; cueing frame storage means for storing the count value of the counting means at the end of cueing by the cueing means; and frames exposed by the exposing means A photographing information storage means for storing the photographing information of the frame, and a photographing information of the frame exposed by the exposing means is read from the photographing information storing means while the film is rewound into the cartridge by the feeding means, and the frame is read by the magnetic recording / reproducing means. A magnetic recording / reproducing camera having magnetic recording control means for performing magnetic recording on a magnetic recording medium. Recording control means does not perform magnetic recording for small frames than the count value when the count value of the counting means is stored in the cue frame storage means. In a camera capable of magnetically recording / reproducing information using a film capable of magnetically recording information, when shooting of each frame of the film is completed, a shooting date and time, shooting conditions, title,
Information such as the number of prints is magnetically recorded. Also, with this camera, it is possible to rewind the film during shooting. When such a halfway take-out film is loaded into the camera, it can be determined that the frame is an exposed frame if magnetic information is recorded in the frame, and an unexposed frame if magnetic information is not recorded in the frame. Therefore, when the film is loaded in the camera, the unexposed frame is detected based on the reproduction result of the information magnetically recorded in each frame while the film is wound, and the unexposed frame is set as a photographing position and cueing is performed. At the same time, the frame value at the end of cueing is stored. Next, when exposure is performed, shooting information of the exposed frame is stored. When the film is rewound, the photographic information of the currently exposed frame is read out, and the photographic information is magnetically recorded in each frame. At this time, magnetic recording is not performed on a frame smaller than the cue frame value. (2) In the camera capable of magnetic recording / reproduction according to the second aspect, the cue frame storage means is a non-volatile memory. (3) The counting means of the magnetically recordable / reproducible camera described in claim 3 stores the count value in a nonvolatile memory. (4) The magnetically recordable / reproducible camera according to claim 4, further comprising a last frame detecting means for detecting the completion of the exposure of the last frame, wherein the counting means detects the completion of the exposure of the last frame by the last frame detecting means. Then
The subtraction count is started after a predetermined correction is made to the perforation detection result by the perforation detection means. Since there is no perforation after the last frame on the film, a count error occurs when rewinding from the last frame and subtracting and counting the number of frames. Therefore, in the case of rewinding from the last frame after exposure, by performing a predetermined correction on the perforation detection result and starting the subtraction counting, the subtraction counting process is the same as in the case of rewinding from the last frame before the last frame. , The subtraction count is correctly performed.

[0009]

FIG. 1 is a view showing a film used for a camera according to the present invention, and shows a state in which a part of a film 100 is pulled out from a cartridge 151. FIG. Film 10
In 0, two perforations are provided for each frame in which one exposure is scheduled. For example, for frame 202, perforations 102a and 10
2b. Further, the film 100 has a magnetic track, and a magnetic recording allowable range for recording data of each frame is defined. For example, frame 20
The magnetic recording unit 302 corresponds to 2. Each magnetic recording unit has a length Ls and a length Ls from the boundary position of each frame.
Both ends are regulated at positions inside by e. A groove is formed in the shaft end of the cartridge 151, and the structure is such that the film 100 is wound or pushed out by rotating the groove.

FIG. 2 is a diagram showing the structure of the peripheral portion of the film of the camera according to the embodiment. The film and cartridge are the same as those shown in FIG. Reference numeral 71 denotes an aperture unit of the camera, and 74 denotes an aperture for exposing a subject image to each frame of the film 100.
72 is an upper rail for regulating the position of the film 100 in the optical axis direction, and 73 is a similar lower rail. 81 is a pressure plate of the camera, and 82 and 84 are openings formed in the pressure plate. Reference numeral 85 denotes a photo reflector, and 87 denotes a magnetic head, which are disposed in the openings 82 and 84, respectively, and directly face the film 100.

The aperture portion 71, the film 100, and the pressure plate 81, which are illustrated separately in a separated form, are actually placed in close contact with almost no gap, and the photoreflector 85 is in contact with the film 10 as indicated by a dashed line 401.
It is arranged to detect a reflectance of 0 or a reflectance of the upper rail 72 through the perforation of the film 100. The photoreflector 85 outputs an H-level digital signal when facing the upper rail 72 having a high reflectance through the perforation of the film 100, and outputs an L-level digital signal when facing the film 100. From the output signal of the photoreflector 85, the position of the opening end of the perforation can be detected.

The magnetic head 87 is disposed at a position facing a magnetic recording unit such as 302, and can be moved in the direction of an arrow 404 perpendicular to the film 100 by the driving force of a motor 88. The motor 88 and the magnetic head 87 are connected by a transmission system (not shown). The forward rotation of the motor 88 moves the magnetic head 87 in close contact with the film 100, and the reverse rotation moves the magnetic head 87 away from the film 100. I do. Reference numeral 51 denotes a spool for winding the film 100. When this spool rotates clockwise when viewed from above, the film 100 moves in the winding direction. The motor 61 provides this rotational driving force.
And the spool 51 are connected by a driving force transmission system (not shown).

A fork 52 is connected to the groove 151a at the shaft end of the cartridge 151. When the fork 52 rotates counterclockwise as viewed from above, the film 100 is rewound into the cartridge 151. Conversely, when the fork 52 rotates clockwise, the film 100 is fed out of the cartridge 151. The fork 52 is driven by a motor 62, and both are connected by a driving force transmission system (not shown).
And the film 100 is rewound into the cartridge 151 by the reverse rotation.

FIG. 3 is an electric circuit diagram of one embodiment. M
CU is a microcomputer. The photo reflector 85 is connected to an interrupt input terminal INT1 of the MCU. The motor driver U1 for driving the film winding motor 61 (M1) includes output terminals P1 and P2 of the MCU.
, And controls the motor 61 (M1) to rotate normally, short-circuit, and open. The motor driver U2 that drives the film feed / rewind motor 62 (M2)
U is connected to the output terminals P3 and P4 of the motor U, and the motor 62 (M
2) is controlled to forward rotation, reverse rotation, short circuit and open state. A motor driver U3 that drives the magnetic head moving motor 88 (M3) is connected to the output terminals P5 and P6 of the MCU, and controls the motor 88 (M3) to rotate forward, reverse, short-circuit, and open.

U4 is a drive circuit connected to the output terminals P7 and P8 of the MCU for controlling the current flowing through the recording coil H1 of the magnetic head 87 in the forward direction, short circuit, and reverse direction.
U5 is an amplifier circuit that amplifies the current generated in the reproducing coil H2 of the magnetic head 87 and converts it into a voltage signal.
It is connected to the U event counter input terminal CNT.

Here, the magnetic recording system for data in this embodiment is a system in which the falling phase is changed according to the value of 1 or 0 for each bit of the digital data binarized to 1/0, Photographing data is recorded according to a predetermined format for each frame. The photographing data includes the photographing date, aperture value, shutter speed, and the like as described above, and the minimum photographing data for the exposure frame is determined in advance. That is, at least the minimum photographing data is magnetically recorded for the exposure frame. Therefore, if magnetic data having the number of bits or more corresponding to the minimum photographing data is recorded, it can be determined as an exposed frame, and if it is less than that, it can be determined as an unexposed frame.
In this embodiment, the minimum number of bits of the photographing data is set to, for example, 150 bits, and the number of bits for the determination of the exposed / unexposed frame is determined based on the number of bits of the minimum data. For example, it is set to 100 bits slightly smaller than the number of bits of the minimum data. In this way, no matter how much noise is mixed in the magnetic recording data, it is impossible to reproduce magnetic recording data exceeding the number of reference bits in the unexposed frame, and the exposed / unexposed frame can be accurately determined. Can be. If the number of determination reference bits is set to a value that is too small, the mixed noise is erroneously recognized as photographed data and erroneously determined as an exposure frame as described above.
It is desirable that the value be slightly smaller than the number of bits of the minimum data.

Next, the operation of the embodiment will be described with reference to flowcharts of FIGS. 4 to 7, time charts of FIGS.
This will be described with reference to the state diagrams of FIGS. Before describing the operations during film loading and rewinding, the variables CNT1F and CNT1R will be described. The variable CNT1F is a variable indicating the number of times of detection of the falling edge of the output pulse when the photoreflector 85 detects perforation in accordance with the film feeding, that is, the number of times of passage at the end of the perforation aperture. FIG. 7 shows the counting process of the variable CNT1F. At the falling edge of the output pulse of the photoreflector 85, a falling interrupt occurs in the MCU, and the MCU executes the interrupt processing shown in FIG. In step 701, the variable CNT1F is incremented and the routine returns.

The variable CNT1R is the value of the photoreflector 85.
Is a variable indicating the number of times the rising edge of the output pulse is detected when perforation is detected during film feeding, that is, the number of times the leading edge of the perforation opening has passed. FIG. 6 shows the counting process of the variable CNT1R.
At the rising edge of the output pulse of the photoreflector 85, a rising interrupt occurs in the MCU,
U executes the interrupt processing shown in FIG. Step 60
In step 1, the variable CNT1R is incremented and the process returns.

FIG. 4 is a flowchart showing the operation when loading a film. Here, a case will be described as an example in which a halfway-extracted film that has been exposed up to the eighth frame and in which photographic data has been magnetically recorded is reloaded into the camera. In step 101, the variable CNT1F is cleared to 0.
In the following steps 102 and 103, the motor 61 (M1),
The normal rotation drive of 62 (M2) is started (point a in FIG. 8). As a result, as shown in FIG.
(M2) rotates clockwise, the leading end of the film 100 is sent out from the cartridge 151, and the leading end is wound around the winding spool 51 soon. Then, the film 100
Is wound by the take-up spool 51 and moves from right to left in FIG.

In step 104, a timer counter TM
R is cleared to 0 and time measurement by this timer is started. In the following steps 105 and 106, the variable CNT
1F and the value of the timer counter TMR are checked, and the variable CN
Until T1F becomes 3, that is, until the first frame is wound up at a position facing the aperture 402, 1000
If it takes longer than ms, it is determined that a film feeding error has occurred, and in steps 161 to 163, the motor 61 (M1),
62 (M2) is released to display an error.

When the normal operation is performed, the operation shown in FIG.
At this point, the film 100 is fed to the position of the state A shown in FIG. 12, and the output of the photoreflector 85 falls because the leading end of the film passes through the photoreflector 85. When the film 100 is further wound up, the state becomes the state B in FIG. 12 at a point c in FIG.
The second perforation, that is, the end of the perforation 101 a on the front end side of the first frame passes through the position of the photoreflector 85. At this point, the variable CNT1
When F becomes 3, the routine proceeds to step 107, where the motor 62 (M
2) Open. To open the motor 62 (M2)
At this point, the leading end of the film 100 has already been wound around the take-up spool 51, and the film feeding force of the cartridge 151 becomes unnecessary. here,
The film 100 is located at a shooting position where the first frame faces the aperture 74, and the magnetic recording unit 3 of the first frame
01 is immediately before the magnetic head 87. At step 108, 1 is set to the film counter FCNT, and at step 109, the contents of the film counter FCNT are set to EEPRO.
Store it in M.

The film 100 is continuously moved in the winding direction by the forward rotation of the motor 61 (M1). In step 111, the variable CNT1F is cleared to 0. In the following step 112, the content of the timer counter TMR is cleared to 0, and time counting by the timer counter TMR is started. Further, in step 113, the variable CNTH is cleared to 0, and counting of the number of pulses input to the CNT terminal is started. Here, the variable CNTH is a predetermined area of the RAM that stores the number of pulses input to the CNT terminal without software intervention. This pulse is generated by the reproduction coil H of the magnetic head 87 as the film moves.
2 is obtained by amplifying the magnetic data detected by the amplifier circuit U5.

At steps 114 and 115, the variable CNT1
If it takes 1000 ms or more until F becomes 2, that is, until the next frame faces the aperture 74, it is determined that a film feeding error has occurred, and the motors 61 (M1) and 62 (M2) are opened in steps 161 to 163. Perform error display. If the variable CNT1F becomes 2 within 1000 ms and the next frame is wound up to the aperture 74, it is determined in a step 116 whether or not the variable CNTH exceeds 100. At this point, the variable CNTH indicates the number of pulses of the magnetic reproduction signal generated during the transmission of one frame of the film. If the frame is an exposed frame, the variable CNTH exceeds 100; The variable CNTH is equal to or less than 100 because the number of pulses is counted by the following equation. If the frame sent immediately before is an unexposed frame, the process proceeds to step 121, and if it is an exposed frame, the process proceeds to step 117. Here, since the explanation is made by taking as an example a film which has been exposed up to the eighth frame, the first frame has been exposed, and as shown at points d to e in FIG. A magnetic reproduction signal is generated at the CNT terminal. Therefore, the determination in the first step 116 is always affirmative, and the process proceeds to step 117.

In step 117, the film counter FC
NT is counted up and the routine proceeds to step 118, where the contents of the film counter FCNT are stored in the EEPROM. Thereafter, the process returns to step 111, and the above processing is repeated. In this way, the processing of steps 111 to 118 is repeated, and when the unexposed frame finishes passing for the first time, the variable CNTH becomes less than 100 in step 116, and the process proceeds to step 121. In the time chart shown in FIG.
Point, g point,... Even if the point i is reached (state C in FIG. 12),
Since a magnetic reproduction signal has been generated, step 116
The determination of ES is continued, but the film reaches state j in FIG. 8 and enters the state D in FIG. 12, and a frame without a magnetic reproduction signal is detected for the first time. Therefore, step 116 is denied,
Proceeding to step 121, a short-circuit brake is applied to the motor 61 (M1). Further, in steps 122 to 123, 20
After waiting for a time of ms, the motor 61 (M
1) is released (point k in FIG. 8).

Here, the position of the film is the state D in FIG.
Is stopped after passing through, the first unexposed frame has passed the predetermined photographing position. Therefore, the process of rewinding one frame is performed from here. In step 131, the variable CNT1
R is cleared to 0, and the motor 62 (M
When the reverse drive is started in 2), the film 100 starts moving in the rewinding direction. Next, in step 133, the timer counter TMR is cleared and the process starts. Step 13
If the value of the variable CNT1R becomes 3 in 4 to 135, that is, if it takes 1000 ms or more to rewind one frame, it is determined that the film feeding is abnormal, and
At 163, the motors 61 (M1) and 62 (M2) are opened to display an error.

If normal operation is performed, 1000
Within 1 ms, the film 100 is rewound by one frame to reach the state E in FIG. 12 (point m in FIG. 8), and the leading end of the perforation of the third frame passes through the photoreflector 85, so that CNT1R becomes 3. Proceeding to step 141, a short-circuit brake is applied to the motor 62 (M2). Then, a wait of 50 ms is performed in steps 142 to 143, and the motor 62 (M2) is opened in step 144 (point n in FIG. 8). Here, the position of the film is in a state where the unexposed frame is set to a predetermined photographing position for the first time. In step 151, the contents of the film counter FCNT are transferred to the variable SCNT. This means that the number of the first frame shot with the cartridge loaded this time is the frame number of the first unexposed frame. Then, in step 152, the contents of the variable SCNT are stored in the EEPROM, and the unexposure frame cueing process ends.

When the cueing of the unexposed frames is completed, an actual photographing operation is performed, and the film for one frame is wound every time photographing is performed. Since the photographing operation and the film winding operation are not directly related to the present invention, a detailed description is omitted.

FIG. 5 is a flowchart for explaining the film rewinding operation. Here, a case will be described as an example where the exposed halfway take-out cartridge is loaded into the second frame of the film, and the film is photographed and rewinded until the 18th frame. FIG. 9 is a time chart in that case, and FIG. 13 is a diagram showing a film feeding state. FIG.
Immediately before the processing of FIG.
In the state of F shown in FIG. This state F is a state in which the eighteenth frame F18 is photographed, the film winding for one frame is completed, and the nineteenth frame F19 is set at a predetermined photographing position. In FIG. 13, a virtual frame 218 of the film is a frame that has been exposed and wound up immediately before, 31
8 indicates a magnetic recording unit for the frame, and 118
a and 118b are two perforations of the frame. In this state, the photo reflector 85 is just near the right end of the perforation 119a. Further, the magnetic head 87 is located at an intermediate position between the perforation 118b and the perforation 119a of the previous frame in the left-right direction.

From this state (point a in FIG. 9), in step 501 of FIG. 5, the storage contents corresponding to the variable SCNT are read from the EEPROM and stored in the variable SCNT of the RAM. This stored value of the EEPROM stores the number of the frame photographed for the first time after the cartridge is loaded in the above-described cartridge loading process. Step 5
In step 02, the variable CNT1F is cleared to 0, and the subsequent step 50 is executed.
3, when the motor 61 (M1) is driven to rotate forward, the film 1
00 starts to move leftward from the position in the state F of FIG. In steps 504 to 505, 1 is set by the timer TMR.
After waiting for 00 ms, the motor 61 (M1) is short-circuited in step 506 (point b in FIG. 9). Further, in steps 507 to 508, a wait of 50 ms is performed by the timer TMR, and in step 509, the motor 61 (M
1) is stopped (point c in FIG. 9). At this point, the film is stopped in the state G shown in FIG. 13 and both the perforations 119a and 119b of the nineteenth frame F19.
There is a photoreflector 85 at an intermediate point between the two. The operation from the start of the rewinding process to this point is to secure a certain amount of "running section" in order to stabilize the speed of the magnetic recording signal with respect to the film when the film moves in the coming rewinding direction. Is a driving in the opposite direction to the rewinding.

In steps 510 to 511, the variable CNT1
Both R and CNT1F are cleared to 0, and driving of the motor 62 (M2) is started in step 512. As a result, the film starts to move rightward from the state G in FIG.
At step 513, it is determined whether or not the film 100 has been terminated. How to detect the end of the film
The number of frames obtained from the cartridge information is compared with the number of frames counted by the film counter.
In this example, since the film 100 still has an unexposed frame, the process proceeds to step 521 instead of the end.

In step 521, the timer TMR is cleared to 0 and started, and in steps 522 to 523, the variable CN is set.
If it takes 2000 ms or more before T1R becomes 2, the process proceeds to step 561, where the motor 62 (M2) is stopped and the process is terminated. In a normal operation, after the tip of the next perforation 119a passes through the photoreflector 85 (point x in FIG. 9), the perforation 1
Since the leading end of 18b passes, the film position is in the state H in FIG. 13, and the output of the photoreflector 85 is d in FIG.
Show the second rise as a dot. Where variable C
The value of NT1R becomes 2, and the routine proceeds to step 524, where the value of the timer TMR is stored in the variable T1. This corresponds to temporarily storing the passage time at the tip of the perforation 118b.

Next, in steps 525 to 526, the variable CN
If it takes 2000 ms or more before the value of T1F becomes 2, the process proceeds to step 561, where the motor 62 (M2) is stopped and the process is terminated. In the normal operation, the end of the same perforation 118b reaches the photo reflector 85, so that the film position becomes the state I in FIG.
The output of the photoreflector 85 falls as shown at point e in FIG. At this point, the value of the variable CNT1F becomes 2, and the routine proceeds to step 527, where the value of the timer TMR at that point is stored in the variable T2. This is perforation 11
This corresponds to temporarily storing the arrival time at the end of 8b. In step 528, a variable TBR is obtained by the following equation and stored.

## EQU1 ## TBR = K * (T2-T1)

In this calculation, the variable TBR is a signal change time per bit when magnetic recording is performed, that is, a bit rate. K is a coefficient that relates the time required to pass from the beginning to the end of one perforation and the bit rate by a linear function, and the actual value is 1
An optimum coefficient may be set for this camera based on the relationship between the perforation width dimension, the allowable length of the magnetic recording track, and the number of magnetic recording bits. Next, step 529
To count down one film counter FCNT,
In step 530, the contents of the variable FCNT are stored in the EEPROM, and the process proceeds to step 531 to determine whether the variable FCNT is equal to or larger than the variable SCNT. If one or more frames have been photographed since the film was loaded, even if the variable FCNT is decremented by one when the process first comes to step 531, it does not fall below the variable SCNT which is the frame number stored at the time of loading. Therefore, step 531 is affirmed and the routine proceeds to step 532, where magnetic recording of frame data is performed.

The frame data is shooting data for each frame, and differs for each frame. Each frame data is stored in a storage area (not shown) for each frame designated by the film counter FCNT. It is. The operation of magnetically recording this data is
This is an operation of repeatedly reversing the current in the recording coil H1 of the magnetic head 87 in the forward direction and the reverse direction, and one cycle of the rise corresponds to the bit rate TBR. Then, by 1/0 of the bit of the recording data,
A method of recording digital data by changing the phase of the falling waveform is employed. When these operations are repeated for a predetermined number of bits, the magnetic recording of the frame data ends. FIG. 9 shows a period during which the magnetic recording operation is performed from point f to point g.

On the other hand, if the film is rewound without taking any frame, if the film counter FCNT is decremented by one at the first step 531, the frame number recorded at the time of loading is obtained. Is smaller than the variable SCNT, that is, step 531 is negative, and the magnetic recording of the frame data in step 532 is not performed.

In steps 533 to 534, the variable CNT1
R and CNT1F are both cleared to 0, and the process returns to step 521 to repeat the processing of steps 521 to 534. Even if the step 531 is initially affirmed, if the film counter FCNT eventually decreases and falls below the frame number at the time of loading, the step 531 is denied, and processing for not performing magnetic recording of frame data is started. For example, in this operation example, since the cartridge already exposed to the second frame is loaded, the film reaches the point r in FIG.
In the state K of 1 after that, magnetic recording is not performed even if the perforation of each frame is detected, and the magnetic recording originally recorded for the second frame and the first frame is maintained.

As described above, in both the case where the unexposed cartridge is loaded and the case where the halfway exposed cartridge is loaded, the magnetic recording of the frame data is performed only for the frame photographed after the current loading, in other words, This realizes the operation of not destroying the magnetic recording data of the frame already photographed by the halfway exposed cartridge.

Thereafter, when the rewinding proceeds and the perforation for the first frame is completed, no edge input is received within 2000 ms in step 523 or step 526. Therefore, a time-out occurs and the routine proceeds to step 561 where the motor 62 (M2 ) Is stopped, and the process ends.

Next, as another operation example, the second operation of the film will be described.
After reloading the halfway cartridge already exposed to the frame, the camera takes the image up to the last frame, and then performs rewinding. The operation in the flowchart of FIG. 5, the timing chart of FIG. This will be described with reference to a schematic diagram of a transmission state. Assuming that the last frame is the fortieth frame, the position of the film is, for example, in the state L in FIG. In this state, the eighteenth frame F18 shown as an example in FIG.
Although the arrangement relationship is the same as that of the frame F40,
No next frame exists. This state (point a in FIG. 10)
Therefore, steps 501 to 508 in FIG. 5 are the same as the above-described operation example, but the film state at the end of step 509 is a state in which the film is stopped in state M in FIG. 14 (FIG. 1).
(Point c of 0), and the positional relationship is such that the photoreflector 85 is located at a position after a certain amount of the 40th frame F40, which is different from the case where rewinding is started halfway.

Thereafter, steps 510 to 512 are common, and the determination in step 513 is the end of the film.
In steps 514 and 515, the variables CNT1R and C
Write 1 to both NT1F. As a result, the processing after the next step 521 becomes the same as when the film is rewound halfway, so that even if the film is moved in the rewind direction from here,
Since there is no perforation of the frame located next to the last frame in the last frame, the PR1 output pulse at points x to y shown in FIG. 9 is missing. The treatment in steps 514 and 515 is one time less than during rewinding.
This is to make up for the subsequent processing by compensating for the count number of the smallest perforation opening. Then, in the loop of the subsequent processing steps 521 to 534 which are completely common to the halfway rewind, completely common operations including the last frame are performed.

As another example of the operation, a completely unexposed film cartridge is loaded, the camera takes the number of frames, and the film is rewound. This will be described with reference to the timing chart of FIG. FIG. 4 is commonly applied to the MCU program executed when the cartridge is loaded. The difference in the resulting operation is that no magnetic reproduction signal is generated in the first frame because the film is an unexposed film. Therefore, the same waveforms as the points i to j in FIG. 8 are generated at the timing from point c to point f in FIG.
When the program first arrives at step 116, N
The determination is O, and the film is rewound by one frame to stop the film. In other words, the imaging preparation state is set in the first frame, and 1 is stored in the variable SCNT for storing the frame number of the first imaging with this cartridge. Then, when rewinding is started after shooting is performed for a certain number of frames, since this cartridge has been shot with this camera from the first frame, FIG.
In step 531 in the loop of steps 521 to 534 of the rewinding process shown in (1), magnetic recording is performed until the value of the film counter FCNT becomes 1, that is, for all frames. FIG. 11 shows the movement at the end of the operation at that time, and the magnetic recording for all the frames is completed with the magnetic recording of the first frame from the point t. At the time of the second falling of the subsequent perforation (v in FIG. 11)
Point), FCNT = 0, S
Although magnetic recording is not performed due to the relationship of CNT = 1, this is not already the area of the photographing frame.

In the configuration of the above embodiment of the present invention,
Motor drivers U1, U2 and motor 61 (M
1) and 62 (M2) are the feeding means, the microcomputer MCU is the counting means, the film cueing means, the photographing information storage means and the magnetic recording control means, and the magnetic writing circuit U4, the amplification circuit U5 and the air head 87 are magnetic. Record /
The reproducing means and the EEPROM constitute the frame storage means.

[0043]

As described above, according to the present invention, when a film is loaded in a camera, an unexposed frame is detected based on the reproduction result of information magnetically recorded in each frame while winding the film. The cueing is performed by setting the unexposed frame as the photographing position, and the frame value at the end of the cueing is stored. Next, when exposure is performed, shooting information of the exposed frame is stored. When the film is rewound, the photographic information of the currently exposed frame is read out, and the photographic information is magnetically recorded in each frame. At this time, magnetic recording is not performed on a frame smaller than the cue frame value. I made it. This prevents any magnetic information from being overwritten on the frame exposed before loading. In addition, since the cue frame value and count frame value are stored in the non-volatile memory, even if the battery is changed while reloading the film taken out halfway and taking a picture, the magnetic field of the frame exposed before loading is removed. Overwriting of information can be prevented. Further, when the completion of exposure of the last frame is detected, a predetermined correction is made to the perforation detection result, and then the subtraction count is started. Since there is no perforation after the last frame on the film, a count error occurs when rewinding from the last frame and subtracting and counting the number of frames. Therefore, in the case of rewinding from the last frame after exposure, by performing a predetermined correction on the perforation detection result and starting the subtraction counting, the subtraction counting process is the same as in the case of rewinding from the last frame before the last frame. , The subtraction count is correctly performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a film used in one embodiment.

FIG. 2 is a diagram showing a configuration of a film peripheral portion of one embodiment.

FIG. 3 is an electric circuit diagram of one embodiment.

FIG. 4 is a flowchart showing a film loading process.

FIG. 5 is a flowchart showing a film rewinding process.

FIG. 6 is a flowchart showing INT1 rising interrupt processing.

FIG. 7 is a flowchart showing INT1 falling interrupt processing.

FIG. 8 is a time chart showing the operation of each unit when a film is loaded.

FIG. 9 is a time chart showing the operation of each unit when the film is rewound.

FIG. 10 is a time chart showing another film rewinding operation.

FIG. 11 is a time chart showing another film rewinding operation.

FIG. 12 is a diagram showing a position of a film when the film is loaded.

FIG. 13 is a diagram showing the position of the film when the film is rewound.

FIG. 14 is a diagram showing a film position in another film rewinding operation.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 film 101a to 104a, 100b to 103b perforation 151 film cartridge 201 to 204 shooting frame 301 to 304 magnetic recording unit 61 (M1), 62 (M2) film feed motor 85 photoreflector 87 magnetic head 88 (M3) magnetic head drive Motor H1 Recording coil H2 Reproduction coil U1, U2, U3 Motor driver U4 Magnetic writing circuit U5 Amplifier circuit MCU Microcomputer

Claims (4)

[Claims] 1. A feeding unit for feeding a film, an exposing unit for exposing a frame set at a shooting position by the feeding unit, a perforation detecting unit for detecting a perforation of the film, and the perforation detecting unit Counting means for adding and counting the number of winding frames when the film is wound by the feeding means, and subtracting and counting the number of rewind frames when the film is rewound by the feeding means, based on the detection result; and magnetic recording of information in each frame. Magnetic recording / reproducing
Reproducing means; detecting means for detecting an unexposed frame based on reproduction information by the magnetic recording / reproducing means; and when the film is loaded in the camera, the feeding means while detecting the unexposed frame by the detecting means. Film cueing means for winding the film and setting the first unexposed frame detected at the photographing position; cueing frame storage means for storing the count value of the counting means at the end of cueing by the film cueing means A photographing information storage unit that stores photographing information of a frame exposed by the exposure unit; and a photographing information of the frame exposed by the exposure unit while rewinding a film to a cartridge by the feeding unit. Magnetic recording which is read from a storage means and magnetically recorded on the frame by the magnetic recording / reproducing means And a magnetic recording / reproducing camera comprising: a magnetic recording / reproducing device, wherein the magnetic recording control device is configured to control a frame whose count value is smaller than a count value stored in the cue frame storage device. A magnetic recording / reproducing camera characterized by not performing magnetic recording. 2. The magnetically recordable / reproducible camera according to claim 1, wherein said cue frame storage means is a nonvolatile memory. 3. The magnetically recordable / reproducible camera according to claim 1, wherein said counting means stores a count value in a nonvolatile memory. 4. The magnetically recordable / reproducible camera according to claim 1, further comprising: a last frame detecting unit that detects completion of exposure of a last frame, wherein the counting unit includes the last frame. A magnetically recordable / reproducible camera, wherein when the detection means detects the completion of exposure of the last frame, a predetermined correction is made to a perforation detection result by the perforation detection means, and then a subtraction count is started.