JPH06325505A - Data reading/writing device - Google Patents

Abstract

PURPOSE:To enable magnetic data, which are not recorded properly, to be in an improved recording state. CONSTITUTION:A signal conversion part 17 decodes data, which are read by a reading head HR, and at the sage time corrects the error of data by an error correction code when reading data from magnetic recording regions MR. When recording data into a magnetic recording medium digitally, error-corrected data are encoded and at the same time, an error correction code is added. Data, which are read by a read head HR while rolling a film FL in the direction of an arrow mA, are written at the same position as that where the data are recorded using a write head HW.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data reading / writing device, and more particularly to a data reading / writing device which can be suitably used for a film having a magnetic recording portion.

[0002]

2. Description of the Related Art A camera capable of writing data relating to photographing (for example, photographing mode, number of prints, shutter speed, aperture value; hereinafter also referred to as "photographing data") in a magnetic recording section provided on a film. , U.S. Pat. No. 4860037, etc. As a result, various data is read from the magnetic recording unit in the laboratory on the magnetically recorded film, and a photograph is printed according to the data.

[0003]

However, the data recorded by the camera in the magnetic recording section (hereinafter also referred to as "magnetic data") is recorded during film feeding or film rewinding. Therefore, the recording may not be normally performed due to the variation of the film feeding speed due to the fluctuation of the battery voltage and the wow flutter of the film feeding due to the low mechanical accuracy. Therefore, the recording state of the data written in the magnetic recording portion cannot be said to be good.

A data reading device installed in a laboratory or the like has a standard range set so that the magnetic data can be read normally, but the magnetic data is read by a household device (for example, on a film). If a normal image is to be read out by a device for displaying the image on a TV), the data reading performance equivalent to that of the data reading device installed in the laboratory is required, and as a result, the cost of the device increases.

Further, when performing digital recording of data,
Error correction codes are usually added to the data. When data is read using this error correction code, data can be read normally even if some signals are lost due to dropout or the like. However, as the number of missing signals increases,
The reading device of the device cannot read normal data.

The present invention has been made in view of this point, and an object of the present invention is to provide a data read / write device capable of making magnetic data in a poor recording state into a good recording state.

[0007]

In order to achieve the above object, a data reading / writing apparatus according to the present invention comprises a reading means for reading data digitally recorded on a magnetic recording medium and data for the magnetic recording medium. When the data is read from the magnetic recording medium with the writing means for digital recording, the data read by the reading means is decoded and the error correction of the data is performed using the error correction code, and the data is written to the magnetic recording medium. When digitally recording, the signal conversion means that encodes the error-corrected data and adds an error-correction code to the data, and the data read by the reading means with the position where the data was recorded. Control means for controlling to write again by the writing means are provided at substantially the same position, That.

[0008]

When the data is read from the magnetic recording medium, the signal conversion means decodes the data read by the reading means and corrects the error of the data using the error correction code. Even if the signal is lost, the data can be read normally.

When the data is digitally recorded on the magnetic recording medium, the signal converting means encodes the data which is error-corrected and normally read, and adds the error correction code to the data to record the data. To write again at the same position as the former position with the writing means,
Since it is controlled by the control means, for example, the data read from the film provided with the magnetic recording portion is rewritten in a normal recording state.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described.
The present embodiment is a magnetically recordable camera capable of reading / writing (that is, reproducing / recording) data relating to photographing with respect to a magnetic recording portion of a film, and FIG. 1 shows a schematic configuration thereof. .

In FIG. 1, a photometric device 3 measures the subject brightness, and an exposure device 2 controls the exposure based on the measured subject brightness. The memory 6 comprises a non-volatile memory,
The shooting mode and the number-of-prints data of the shooting data are electrically stored for each shooting of each frame of the film.

The film FL which can be used in each of the embodiments of the present invention will be described with reference to FIG. Film FL has two perforations P per frame.
Equipped with F. Perforation PF is each frame F
It is on both ends of the upper part of R and is used for detecting the film feed amount at the time of film feed. That is, the film reflector FL is moved from the position of the perforation PF by the photo reflector PR.
The frame position of is detected. In FIG. 2, there is a film cartridge (not shown) on the left side and a take-up spool (not shown) on the right side. When the film FL is wound up, the film FL moves in the direction of arrow m _A, and when the film FL is unwound, the film FL moves in the direction of arrow m _M.

Under each frame FR on which a subject image is formed, a magnetic recording portion MR (hatched portion) corresponding to it is provided. Data (shooting mode, number of prints, shutter speed, and aperture value) relating to shooting is magnetically recorded in the magnetic recording unit MR. High-definition shooting mode
There are three types (aspect ratio is 9:16), normal (aspect ratio is 2: 3) and panorama (aspect ratio is 1: 3). In the laboratory, the magnetic data of the photographing mode is read from the magnetic recording unit MR, and printing is performed in a size according to the photographing mode.

That is, when the photographing mode is normal, the normal print is the high-definition print range FH.
The area FN is obtained by trimming the left and right portions (the shaded portion of the central frame FR) of and the area FN. When the shooting mode is Panorama, the panorama is printed in the upper and lower parts of the high-definition print range FH (the right frame F
It is obtained by trimming (shaded portion of R) and printing the range FP.

In FIG. 1, a film feeding device 5 winds and rewinds the film FL. The feed amount detection device 4 is composed of the photo reflector PR (FIG. 2) and the like, and detects the feed amount of the film FL by detecting the perforation PF.

The magnetic recording device 8 magnetically records data relating to photographing (that is, photographing mode, number of prints, shutter speed and aperture value) for each frame FR of the film FL while winding the film FL by the film feeding device 5. It records in the section MR. The magnetic reproducing device 7 rewinds (or winds up) the film FL by the film feeding device 5 and outputs data relating to photographing from the magnetic recording portion MR of the film FL (that is, photographing mode, print number data, shutter speed and aperture value). ) To play. Display device 9
Is the shooting mode, number of prints, shutter speed,
Displays shooting data such as aperture value.

The magnetic recording device 8 is composed of the erasing head HE and the writing head HW shown in FIG. 2, and the magnetic reproducing device 7 is composed of the reading head HR shown in FIG. For example, the frame FR showing the range FN in FIG.
If the position of is the frame FR exposed in the next shooting (the first frame FR of the unexposed frames FR), the frame F
On the winding side of the film FL of the magnetic recording portion MR of R (on the right side of FIG. 2), the read head HR and the erase head H are arranged in order from the left.
E, the write head HW is arranged. The read head HR may be in any position with respect to the other heads,
As will be described later, data writing is performed while winding the film FL in the m _A direction, so that the erasing head HE needs to be arranged on the left side of the writing head HW.

FIG. 3 shows a form of magnetic recording data recorded in the magnetic recording portion MR by the write head HW. The magnetic data (shooting mode, number of prints, shutter speed, and aperture value) of one frame FR are, in order from the film winding side (right side of FIG. 3), a start bit BS, a data type determination bit BK, a data section BD, and an end. It is composed of bits BE. Further, the date, comments, etc. may be recorded.

The magnetic recording data reader used for development in the lab first detects the start of the data by detecting the start bit BS, and the data type discrimination bit BK.
Determines the type of data (shooting mode, number of prints, shutter speed, aperture value, etc.). Then, the subsequent data portion BD is read, and the end bit BE is used to detect the end of one piece of data relating to the shooting of one frame FR.

In FIG. 1, a data change switch S _CHG is a switch for instructing a change in data relating to photographing for a predetermined photographed frame FR of the film FL, and rewrites the data regarding the photographing mode and the number of prints that have been recorded once. Sometimes used. Then, the switch for setting the data related to shooting is the print number setting switch S
_{The CNT} and the photographing mode selection switch S _MOD are set, and the set data relating to photographing is magnetically recorded in the magnetic recording unit MR by the magnetic recording device 8.

The print number setting switch S _CNT is
It is a switch to set the number of prints when printing,
By turning it on, the specified number can be cyclically changed. In other words, it is usually set to one,
Each time it is turned on, the number of sheets increases by one, and when the number of sheets reaches nine, the number of sheets returns to zero. It should be noted that the image is reset to one at the end of shooting. The shooting mode selection switch S _MOD
Is a switch for setting the photographing mode, and by turning it on, the designated photographing mode can be cyclically changed. In other words, the mode is switched from high-definition to normal to panorama to high-definition each time it is turned on.

When the release switch S _REL is turned on, a series of operations including photometry, exposure, film feeding and the like are performed. The data change switch S _CHG , the number of prints setting switch S _CNT, and the shooting mode selection switch S _MOD are all turned ON when one push button is pressed, and O
It is a switch in the FF state. The switch S _CHG ,
Based on the states of S _CNT , S _MOD , and S _REL , the microcomputer (microc
omputer) 1 controls each of the above blocks.

FIG. 4 and FIG. 5 are flowcharts of the first embodiment in a normal state. When the power switch (not shown) is turned on, the control operation by the microcomputer 1 is started. At this time, the frame FR exposed in the next shooting is at the position where the subject image is projected.

First, in step # 5, the photographing mode and the number of prints stored in the memory 6 and the number of frames exposed in the next photographing (that is, data indicating what frame) are displayed on the display device 9. The shooting mode and the number of prints displayed at this time are, for example, data set in the initial setting (
(Shooting mode: normal mode, number of prints: 1) may be used. If the power switch is turned off and then turned on again after the predetermined number of images have been taken, the power is turned off.
The data from the last shooting before F may be used. The display of the number of frames is set to 1 when no image has been taken yet after the film is loaded. If the power switch is turned off after the specified number of shots have already been taken, the power switch will turn off.
The number of frames FR to be exposed next in the state immediately before is set. Then, what is detected by the feed amount detection device 4 is stored in the memory 6 before the power is turned off, and this is read and displayed.

Next, in step # 10, it is determined _whether the release switch S _REL is ON or OFF. Release switch S
_{When REL} is ON, photometry (that is, measurement of subject brightness) is performed in step # 20. Then, exposure is performed based on the obtained subject brightness (# 30).

In step # 40, the shooting mode and the number of prints of the shooting data are stored in the memory 6. The shutter speed and the aperture value are not stored in the memory 6 because there is no need to change them after shooting. However, in order to magnetically record on the film FL (step # 60 described later), the shutter speed and aperture value determined based on the subject brightness measured by the photometric device 3 are temporarily stored in the memory in the microcomputer 1. When newly released, the previously stored data is erased and new data is stored.

Next, at step # 50, film winding is started in the direction of the arrow m _A shown in FIGS. While winding the film FL, the photographing mode, the number of prints, the shutter speed, and the aperture value stored in the memory of the microcomputer 1 are magnetically recorded in the magnetic recording unit MR of the film FL by the magnetic recording device 8 (# 60). In step # 70,
The feed amount detection device 4 determines whether or not the winding amount reaches one frame.
Detect with. Wait for the film winding amount to reach one frame, then stop film winding in step # 80, and then in step # 5.
Return to.

In step # 10, the release switch S _REL
If is OFF, the ON / OFF judgment of the print number setting switch S _CNT is performed in step # 90. If the print number setting switch S _CNT is ON, the number of prints stored in the memory 6 (the number of prints displayed on the display device 9 at this time) is increased by one in step # 100, and the process returns to step # 5. . When the number of prints that has already been set is 9, as described above, 0
Set to one.

If the number-of-prints setting switch S _CNT is OFF in step # 90, ON / OFF determination of the photographing mode selection switch S _MOD is performed in step # 110. If the print count setting switch S _MOD is ON, step #
In 120, the photographing mode stored in the memory 6 (the photographing mode displayed on the display device 9 at this time) is changed, and the process returns to step # 5.

The steps # 100 and # 120 are as follows.
Magnetic recording unit M corresponding to frame FR exposed in the next shooting
The data to be written in R is changed in the memory 6, and the frames FR that have been photographed (for example, the range FN in FIG. 2).
The frame FR showing the
Then, the frame FR on the right side of that corresponds.)
It is not for changing the data recorded in the magnetic recording portion MR corresponding to.

If the photographing mode selection switch S _MOD is OFF in step # 110, it is determined in step # 130 _whether the data change switch S _CHG is ON or OFF. If the data change switch S _CHG is OFF, the process returns to step # 5, and if it is ON, the frame FR exposed in the next shooting in step # 140 (the first frame F of the unexposed frames FR is exposed).
It is determined whether R) is the first frame FR of the film FL. If it is the first frame, there are no frames that have been photographed. Therefore, the process returns to step # 5, and if it is not the first frame, the number of frames exposed in the next photographing is stored in the memory 6 in step # 150.

[0032] In next step # 160, FIG. 2, to initiate film rewinding the arrow m _M direction shown in FIG. While rewinding the film FL, the photographed data (that is, the photographing mode, the number of prints, the shutter speed, and the aperture value) of the frame FR rewound in step # 170 is recorded in the magnetic recording unit MR.
Read into the memory in the microcomputer 1. At this time, since the magnetic data passes through the read head HR from the end bit BE side shown in FIG. 3, the signals read in the reverse order in the microcomputer 1 are changed to the start bit BS.
After that, the line is returned to the lined up state and the subsequent processing is performed.

Further, in # 170, the shutter speed and aperture value without data change are read from the magnetic recording unit MR together with the photographing mode and the number of prints because the shutter speed and aperture value are stored in the memory as described above. This is because it is not stored in 6. in this way,
It is possible to reduce the required memory capacity by storing only a part of the imaging data to be written in the magnetic recording unit MR in the memory 6.

In step # 180, the feeding amount detecting device 4 detects whether the rewinding amount of the film FL has reached one frame. After the rewinding amount reaches one frame, the rewinding is stopped in step # 190. Next, the photographing mode, the number of prints, the shutter speed, and the aperture value read in the memory of the microcomputer 1 in step # 170 are displayed on the display device 9 together with the number of frames (# 20).
0).

The microcomputer 1 determines _whether the switch _SCNT is ON or OFF in step # 210. When the print number setting switch S _CNT is ON, the set print number displayed on the display device 9 is incremented by 1 in step # 220, the number is also written in the memory 6, and the process returns to step # 200.
As in step # 100, if the number of prints that has already been set is 9, it is set to 0.
Setting the number to 0 means that printing is not necessary. For example, if the shooting fails, the number of prints can be set to 0 in this way to easily prohibit printing in the laboratory.

If the number-of-prints setting switch S _CNT is OFF in step # 210, it is determined _whether the photographing mode selection switch S _MOD is ON or OFF in step # 230. If the shooting mode selection switch S _MOD is ON, step #
At 240, the photographing mode displayed on the display device 9 is changed and written in the memory 6, and the process returns to step # 200.

When the photographing mode selection switch S _MOD is OFF in step # 230, ON / OFF determination of the data change switch S _CHG is performed in step # 250. If the data change switch S _CHG is OFF, the process proceeds to step # 270, and if it is ON, it is determined in step # 260 whether or not the frame FR currently subjected to data change is the first frame FR of the film FL. . If it is the first frame, there are no other frames FR that have been photographed, so the flow proceeds to step # 270. If it is not the first frame, the process returns to step # 160 and the data changing operation similar to the above is repeated for the frame FR one frame before. Therefore, frame F that does not change data
Each time the switch S _CHG is turned on (# 250), R is sent one frame at a time (rewound).

Next, in step # 270, it is determined _whether the release switch S _REL is ON or OFF. When the release switch S _REL is OFF, there is a possibility that the data will be further changed, so the process returns to step # 200. If it is ON, it means that the data change in the memory 6 has been completed, and therefore the process proceeds to step # 290 (FIG. 5) to start a series of operations until the next exposure.

In step # 290 shown in FIG. 5, film winding is started in the direction of the arrow m _A shown in FIGS. In step # 300, it is determined whether or not the frame FR to be wound up (the number of frames is determined based on the detection result of the feeding amount detecting device 4) is the frame FR for which the data has been changed. The determination as to whether or not the data has been changed is performed as follows, for example. A correction flag corresponding to each frame FR is provided in the memory 6 storing the shooting mode and the number of prints. This correction flag is changed to data (# 220,
# 240) is set to 1 and 0 is set if data is not changed. In step # 300, it is determined whether or not the data has been changed based on this correction flag.

When it is determined in step # 300 that there is no change, it is determined in step # 400 whether the film FL has been wound up by one frame. After the film FL for one frame is wound up, the process proceeds to step # 380. If it is determined that there is a change in Step # 300, Step #
At 310, the shutter speed and aperture value are read from the magnetic recording portion MR of the film FL (FIG. 2). In this case, the magnetic data is read from the start bit BS side by the head HR shown in FIG.

[0041] to determine whether wound up by one frame at step # 320, waiting to be wound by one frame, the film winding is stopped, FIG. 2, starting film rewinding the arrow m _M direction shown in FIG. 3 Yes (# 330). Note that step #
When it is determined in 320 that the winding of one frame has been completed, it means that the reading of the magnetic data (shutter speed and aperture value) of one frame has been completed.

Next, at step # 340, it is judged whether or not one frame has been rewound, and after waiting for one frame to be rewound, the film rewinding is stopped and the direction of arrow m _A shown in FIGS. Then, film winding is started (# 350). When it is determined in step # 340 that the rewinding for one frame is completed, the erasing head H is moved toward the winding direction (arrow m _A direction) of the start bit BS of the magnetic data as shown in FIG.
E is located.

While winding the film FL in the direction of the arrow m _A , in step # 360, data is recorded in the magnetic recording unit MR (the number of prints read from the memory 6 (# 220) and the photographing mode (# 240) and the magnetic recording unit MR). Shutter speed and aperture value (# 310)}.

Then, in step # 370, it is determined whether or not one frame has been wound, and after waiting for one frame to be wound, in step # 380, the target frame FR stored in the memory 6 (see FIG. 4). It is determined whether or not the film FL has been wound up to # 150). Here, the determination of the target frame for the first time after sending one frame of the frame FR in which the data change has been written (that is, the data modification) is performed only when one frame has been sent until step # 380 to step # 380. This is because there is a possibility that the process proceeds to step 300, the determination is made that there is a change, and the process automatically proceeds to step # 310.

If it is determined in step # 380 that the frame is not the target frame FR, the process returns to step # 300. If it is determined in step # 380 that the frame is the target frame FR, in step # 390 the film winding is stopped, and then step # 5.
Return to (Fig. 4).

In the present embodiment, in order to reduce the memory capacity as described above, only a part of the data to be written in the magnetic recording portion MR of the film FL (shooting mode and number of prints) is stored in the memory 6. ing. When data is written to the magnetic recording portion MR for correction, magnetic recording is performed after the data (shutter speed and aperture value) is once read. However, all write data to the magnetic recording portion MR is stored in the memory 6. If it is configured to be stored in, the data reading and film rewinding in steps # 310 to # 350 are unnecessary.

In the present embodiment, the shooting mode,
The data of the number of prints is always recorded in the magnetic recording unit MR with the photographing, but when these data are not recorded in the magnetic recording unit MR, the normal mode and the number of prints = 1, respectively. By making an agreement, it is possible to omit the data writing operation under such photographing conditions.

FIG. 6 shows the change data write control operation of FIG.
A modification of (# 290 to # 400) is shown. As shown in FIG. 3, each frame FR is recorded in the magnetic recording portion MR of each frame FR.
Start bit B for each type of magnetic data
There is a data portion BD surrounded by S and the end bit BE. In the flowchart of FIG. 5, as described above, each frame F
Read all the magnetic data for each R at once, and rewrite the necessary part on the memory 6 regardless of whether the data is changed,
I try to write them all at once. On the other hand, in the flowchart of FIG. 6, only the data to be corrected is searched from the magnetic recording portion MR of each frame FR, and only the portion of the magnetic data of one frame where the data is changed is rewritten for each type.

The details will be described below. First, step #
At 1000, film winding is started in the direction of the arrow m _A shown in FIGS. In step # 1005, it is determined whether or not the frame FR to be wound up (the number of frame FR is determined based on the detection result of the feeding amount detecting device 4) is the frame FR for which the data has been changed. The determination as to whether or not the data has been changed may be performed in the same manner as in step # 300 in FIG. 5, but here, the determination is performed as follows. That is, since there are two types of data to be corrected, that is, the shooting mode and the number of prints, a memory is reserved for each 2 bits for each frame FR, and it is determined whether 2 bits are all 0 or at least one is 1. If both are 0, it is determined that there is no change, and if at least one is 1, it is determined that there is a change.

If it is determined in step # 1005 that there is no change, it is determined in step # 1110 whether the film FL has been wound up by one frame. Film FL for one frame
Wait for the item to be wound up and proceed to step # 1090. If it is determined that there is a change in step # 1005,
While continuing to wind the film, in Step # 1010, film F
Read data from L one by one. In this case, the magnetic data is read by the read head HR shown in FIG. 3 from the start bit BS side.

With the read head HR, the start bit BS,
The data type determination bit BK is read and the data type is determined whether the read data is changed data (target data) (# 1020). The determination as to whether or not it is the target data is performed as follows. Step # 1005
As described above, since there are two types of data to be corrected, that is, the shooting mode and the number of prints, a memory is secured for each 2 bits for each frame FR. If either one is 1, the frame FR has data changed (that is, one of the shooting mode and the number of prints has changed). Therefore, reproduction is performed while waiting for the corresponding data. When both are 1, when the correction of the one read first is completed, the flag is returned to 0, the next data is corrected in the same way, and the flag is set to 0.
Return to.

Note that different flags may be used for the determination in step # 1005 and the determination in step # 1020. That is, 1 bit is reserved in the memory as a dedicated flag indicating whether or not there is a change, and 2 bits are reserved in the memory as a correction flag indicating the target data.
In step # 1005, the determination is made using a dedicated flag indicating the presence or absence of change, and in step # 1020, the correction flag is used to perform the determination in the same manner as described above.

If it is determined in step # 1020 that the data is not the target data, the process returns to step # 1010, and if it is determined that the data is the target data, the process proceeds to step # 1030. Here, the film winding is stopped, and
The film rewinding is started in the direction of the arrow _{M M} indicated by (# 10
30). Playback is performed while rewinding, and it is determined in step # 1040 whether or not the erasing head HE has reached the target position (that is, the start bit BS position of the data to be corrected). For example, if the code of the start bit BS is 1011, 1101 comes from the read head HR, and therefore the position where it is detected is judged to be the target position. The head position of the data portion BD may be set as the target position, but in this embodiment, the film is rewound to the start bit BS position for ease of positioning. After waiting for the erasing head HE to reach the target position, the process proceeds to step # 1050.

Here, the film rewinding is stopped and the film winding is started in the direction of the arrow m _A shown in FIGS. 2 and 3 (# 1050). While winding the film FL in the direction of the arrow m _A , the correction data is written in the magnetic recording portion MR in step # 1060. At this point, the correction of the magnetic data currently targeted for correction is completed. The correction flag is set to 0 upon completion of this correction.

Next, in step # 1070, it is determined whether or not all the corrections on the frame FR which is the current correction target are completed. This determination is performed as follows. As described above, since there are two types of data to be corrected, that is, the shooting mode and the number of prints, two bits of memory are reserved for each frame FR, but since correction is performed one by one, if both are corrected ( (If both are 0 in # 1005)
It is determined that the data correction is completed. If the data correction is not completed, the process returns to step # 1010, and if the data modification is completed, the process proceeds to step # 1080.

Steps # 1080 to # 1100 perform the same operations as steps # 370 to # 390. That is, it is determined in step # 1080 whether or not the film FL has been wound up by one frame, and after waiting for one frame to be wound up, in step # 1090, the target frame FR stored in the memory 6 (see FIG. 4). It is determined whether or not the film FL has been wound up to # 150). Step # 1090
If it is determined that the frame is not the target frame FR in step #
Return to 1005. In step # 1090, the target frame FR
If it is determined that the film winding is stopped in step # 1100, the process returns to step # 5 (FIG. 4).

If the type of data and the order of writing data are fixed in advance (for example, from the right side in FIG. 3, shutter speed, aperture value, photographing mode, number of prints), data reading (# 1010) And discrimination (# 10
20) is unnecessary, the rewinding operation (# 1030, # 1
040) is also unnecessary. Therefore, after step # 1005, the correction data write operation (# 1060 to # 110) is performed.
0) can be performed.

If the film feeding speed is controlled to be constant or a film feeding amount detecting device capable of accurately detecting the moving amount of each frame FR is provided, various data to the magnetic recording portion MR can be obtained. Since the writing position of is determined almost accurately, read the data actually (# 1010- #
It becomes unnecessary to detect the position of the corrected data by 1040).
The film feed amount detection device referred to here is different from the film feed amount detection device 4 (FIG. 1) including a photo reflector PR (FIG. 2) for detecting one frame, and generates 100 pulses per frame, for example. The film feed amount can be detected with such high accuracy. According to this, it is possible to determine at which position in one frame the correction data is located from the number of generated pulses without reproducing. Specifically, it can be configured by using a photoreflector in which a rubber roller is brought into contact with the film FL and a pulse is generated by the rotation thereof.

As described above, one of the features of this embodiment is that
After the user of the camera instructs the data change switch S _CHG to change the data of a predetermined frame FR that has been photographed,
When data relating to a predetermined shooting is reset by the shooting mode selection switch S _MOD or the number of prints setting switch S _CNT , the magnetic recording device 8 rewrites the data recorded in the magnetic recording unit MR to the reset data. To do. Thereby, the user of the camera can easily correct the magnetic data recorded in the magnetic recording portion MR of the film FL before development. Therefore, for example, even if the user takes a picture with the wrong shooting mode or shoots with the wrong number of prints set, the magnetic data can be easily corrected without printing. Further, even if the photographing fails, the printing in the laboratory can be prohibited by a simple operation of setting the number of prints to 0 with the print number setting switch S _CNT .

Further, since the display device 9 for displaying the data read from the magnetic recording portion MR is provided, it is possible to confirm or change the data already recorded in the magnetic recording portion MR before changing the data. Later data can be confirmed. Therefore, there is an advantage that it is not necessary to re-record the data of the frame FR for which the data need not be changed, to record the data content set at the time of shooting each time the shooting is performed, or to remember it.

The data correction in this embodiment has been described above, but the data in the memory 6 is changed.
If new data can be additionally set and written in the film FL in (# 220, # 240), it is also possible to record a message, comment, date, etc. after shooting.

FIG. 7 is a flowchart for rewinding the film after the shooting of a predetermined number of frames is completed. Here, the film rewinding performed after the shooting of a predetermined number of frames is not only the film rewinding of all the frames performed after the shooting of the final frame of the film FL is finished, but also the shooting of the film FL is performed halfway. It also includes rewinding on the way after performing.

The control operation during film rewinding will be described below with reference to the flowchart of FIG. First, at step # 510, FIG. 2, to initiate film rewinding the arrow m _M direction shown in FIG.

While rewinding the film FL, step #
At 520, the photographing mode, the number of prints, the shutter speed, and the aperture value are read from the magnetic recording unit MR of the film FL into the memory in the microcomputer 1. In step # 520, the photographing mode and the number of prints of the frame FR from which the magnetic data is read are read from the memory 6 into the memory in the microcomputer 1 (# 530).

In step # 540, it is determined whether or not the photographing mode and the number of prints read from the magnetic recording portion MR of the film FL are the same as the photographing mode and the number of prints read from the memory 6. If they match, it is determined in step # 550 whether or not the film rewinding (including data confirmation) for all the frames that have been photographed has been completed. This determination is made based on the number of frames detected by the feed amount detection device 4.

If the film rewinding for all frames has not been completed, the process returns to step # 520, and if the film rewinding for all frames has been completed, the process proceeds to step # 560. In step # 560, the remaining film (that is, the tongue) is wound into a cartridge (not shown). Next, in step # 570, the film rewinding is stopped and the control operation is ended.

If it is determined in step # 540 that they do not match, it is determined in step # 580 whether or not the film rewinding has reached one frame. After the film FL is rewound by one frame, the process proceeds to step # 590. At step # 590, the film rewinding is stopped, and then step # 6.
At 00, film winding is started in the direction of the arrow m _A shown in FIGS.

While winding the film FL, step #
The shooting mode and the number of prints read from the memory 6 in 530, and the shutter speed and aperture value read from the magnetic recording unit MR of the film FL in step # 520 are magnetically recorded in the magnetic recording unit MR of the film FL (#
610). The magnetic recording is performed by the write head HW at the same position as the position of the erased data after erasing the data already recorded by the erase head HE shown in FIGS. 2 and 3. The write position may be substantially the same as or substantially the same as the erased data position. Next, in step # 620, it is determined whether or not the film winding amount reaches one frame. After waiting for the film FL to be wound up by one frame, the process proceeds to step # 630. Step # 630
To stop film winding, return to step # 510,
Confirm whether there is a data write error for the next frame FR,
Make corrections.

As described above, the data already written in the magnetic recording portion MR is reproduced by the magnetic reproducing device 7 while rewinding the film FL, and the memory 6 is taken every time each frame FR is photographed.
The data required for this comparison is compared with the data relating to the photographing which is electrically stored in the film FL in the film feeding device 5 after the photographing of a predetermined number of frames is completed. To rewind. In other words, by collectively confirming whether or not the data has been normally written, the shooting cycle for each frame is prevented from becoming long. In this embodiment, the microcomputer 1
Although the data recorded in the magnetic recording portion MR is rewritten based on the data stored in the memory 6 based on the comparison result output by, for example, a warning signal is issued or a predetermined operation is performed based on the comparison result. May be prohibited.

Next, a second embodiment of the present invention will be described. The second embodiment is the film F shown in FIGS.
This is a data read / write device for reading and re-recording the data written in the L magnetic recording portion MR. Also,
The second embodiment is used as a device other than a camera, for example, a data reading / writing device in a laboratory or a reading / writing device used in a slide projector for projecting a developed film.

FIG. 8 is a block diagram showing a data read / write device of the second embodiment. The microcomputer 1 controls the operation of each part in the figure. The reading unit 16 is a film F.
The data digitally recorded in the L magnetic recording portion MR is read. This data is, for example, shooting data such as shooting mode, number of prints, shutter speed, aperture value, date, comment and message. The erasing unit 15
The data recorded in the magnetic recording portion MR of the film FL is erased. The writing unit 14 digitally records data on the magnetic recording unit MR of the film FL. The microcomputer 11
The data read by the reading unit 16 is controlled to be written again by the writing unit 14 at a position substantially the same as the position where the data was recorded. Film feeding device 13
Performs the feeding (that is, winding and rewinding) of the film FL. The memory 12 temporarily stores the data read from the magnetic recording portion MR of the film FL.

When the data is read from the magnetic recording portion MR of the film FL, the signal converting portion 17 decodes the data read by the reading portion 16 and corrects the error of the data by using the error correction code to perform magnetic recording. When the data is digitally recorded in the section MR, the error-corrected data is encoded and an error correction code is added to the data.

FIG. 9 is a diagram showing a signal flow of the data read / write device. The film FL is moved by the film feeding device 13 relative to the read head HR, the erase head HE, and the write head HW whose positions are fixed. Film FL with arrow m
While moving in the _A direction, the reading unit 16 is moved to the magnetic recording unit M.
Read data from R. Since data is digitally recorded in the magnetic recording portion MR as shown in FIG. 3, the read head HR reads each data in the order of the start bit BS, the data type discrimination bit BK, the data portion BD and the end bit BE. To go.

The magnetic data read from the magnetic recording unit MR by the reading unit 16 is decoded by the signal conversion unit 17,
It is stored in the memory 12. At this time, even if incomplete data is read due to magnetic data dropout, reading error, or the like, the signal conversion unit 17 corrects the error during decoding. This is due to the conventionally known error correction control method. In other words, the error correction code added when digitally recording the data is used to correct the error when reading the data, and thus the data can be read normally even if some signals are lost due to dropout or the like. To do so.

When the magnetic recording portion MR of the film FL from which data has been read by the reading portion 16 reaches the position of the erasing head HE, the already recorded data is erased by the erasing head HE. Immediately after that, when the data-erased magnetic recording portion MR reaches the position of the write head HW,
The data temporarily stored in the memory 12 is encoded by the signal conversion unit 17, and is recorded again in the magnetic recording unit MR by the writing head HW by the writing unit 14 together with the error correction code. The magnetic recording portion M of each frame FR for each head
The position of R is the feed amount detecting device 4 in the first embodiment.
Can be carried out using the equivalent of.

Writing is performed at a position substantially the same as the position where the erased data was recorded. It should be noted that when writing is performed, the predetermined data stored in advance in the memory 12 may be added to the read data.

Devices other than the data reading / writing device in the laboratory (for example, a reading device used in a home slide projector) generally have poor magnetic data reading performance. According to this embodiment, magnetic data that is not recorded well can be made into a good recording state. Therefore, the magnetic data written by the camera with low accuracy can be read / written in the lab to which this embodiment is applied. If the device is used to write with high precision and accuracy, it is possible to reduce the reading performance of a home slide projector or the like and reduce the cost. Further, even a film which has already dropped out can be restored to a good recording state.

Next, a third embodiment of the present invention will be described. The third embodiment is a data reading / writing device for reading and re-recording the data written in the magnetic recording portion MR (FIGS. 2 and 3) of the film FL as in the second embodiment. As shown in the block diagram of FIG. 10, the third embodiment has the same configuration as the second embodiment except that an input device 18 and a display device 19 are provided. FIG. 11 shows the signal flow of this embodiment, which is the same as the second embodiment except that an input device 18 and a display device 19 are provided and a read / write head HRW that is used for both reading and writing is provided. Is the flow of signals. The same parts as those in the second embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

The input device 18 corrects data read from the magnetic recording portion MR of the film FL, adds data, and deletes data. Further, the input device 18 outputs a signal instructing the start of data writing. Display device 19
Displays data for all frames read from the magnetic recording portion MR of the film FL.

Data reading is performed as follows.
The film FL is adapted to be moved by the film feeding device 13 with respect to the read / write head HRW and the erasing head HE whose positions are fixed.
While moving the film FL in the direction of the arrow m _A , the reading unit 16 moves the magnetic recording unit MR by the read / write head HRW.
Read data from. Since data is digitally recorded in the magnetic recording portion MR as shown in FIG.
The write head HRW includes a start bit BS, a data type discrimination bit BK, a data section BD and an end bit BE.
Read each data in the order of.

The data read from the magnetic recording unit MR by the reading unit 16 is decoded by the signal converting unit 17 and stored in the memory 12 for all frames of the film FL. The second
Similar to the embodiment, even when incomplete data is read due to magnetic data dropout, reading error, etc.,
Similar to the second embodiment, the signal converter 17 corrects errors during decoding. Then, the data stored in the memory 12 is displayed on the display device 19. When the reading and displaying of the data are completed in this way, the film FL is rewound in the direction of the arrow m _M , and is moved to the winding direction m _A side (the right side in FIG. 11) of the magnetic recording portion MR of the frame FR which is first read. Position the erase head HE. Then, the input device 18 waits for a signal instructing to start data rewriting.

Now, using the input device 18, the memory 12
You can modify, add, or delete the data read in. When correcting, adding or deleting data, the number of frames to be corrected, added or deleted by the input device 18 such as a keyboard,
Enter the correction / addition / deletion contents. The input data is stored in the memory 12 and displayed on the display device 19 together with the uncorrected data of the read data.

For example, if the camera does not have a function for designating the number of prints, the number of prints is not recorded in the magnetic recording unit MR, and a predetermined number (for example, one) is printed in the laboratory. By using the present embodiment, it is possible to additionally specify the number-of-prints data. Further, even when the camera does not have a function of recording shooting date and time, comments, etc., these data can be added, and these data can be deleted after shooting. Further, it is possible to arbitrarily correct the magnetic data such as the photographing mode, the number of prints, the shutter speed, the aperture value, the date, the comment and the message.

When the data writing is instructed by the input device 18 after the data is corrected as necessary, the film winding is started when the data writing is instructed. While winding the film FL, the old data already recorded in the magnetic recording portion MR is first erased by the erasing head HE. Immediately after that, the writing unit 14 writes data to the position substantially the same as the position where the old data was recorded by the read / write head HRW. That is, the data for all the frames stored in the memory 12 are encoded by the signal conversion unit 17, and the read / write head HRW is written by the writing unit 14 together with the error correction code to the magnetic recording unit MR of the corresponding frame FR. It is recorded again. The position of the magnetic recording portion MR of each frame FR with respect to each head can be adjusted by using the one corresponding to the feeding amount detecting device 4 in the first embodiment.

As described above, in the second embodiment, reading and writing of signals are performed in parallel (that is, reading and writing while correcting), whereas in the third embodiment, once for all frames ( After reading the data for one film), write the data at another timing. Therefore, the film F
In order to temporarily store data for all frames read from the L magnetic recording unit MR, the memory 12 needs a memory capacity for one film. However, since reading and writing are not performed at the same time, it is possible to integrate the read head HR and the write head HW, and as a result, in addition to the effects of the second embodiment, the device can be made compact. There is an effect that the cost can be reduced.

In the first and second embodiments described above, MD (min
It is also applicable to i disc) and DCC (digital compact cassette tape). Since these devices can perform digital-digital dubbing only once, the signal loss of the dubbed child disk (or tape) can be repaired by once converting it to analog data and dubbing. However, some deterioration of the data recording state cannot be avoided. Even if digital-digital dubbing is possible, two reading / writing devices and two disks (or tapes) are required. However, if the read / write device of the second or third embodiment is used,
It is possible to recover data without dubbing.

[0087]

As described above, according to the present invention, the signal converting means, when reading data from the magnetic recording medium, decodes the data read by the reading means and uses the error correction code to correct the data error. Since the correction is performed, there is no abnormality in data reading due to the loss of some signals, and when digitally recording data on the magnetic recording medium, the error-corrected data is encoded and the error-correction code is added. In addition to the data, the control unit controls the writing unit to rewrite the data read by the reading unit to the substantially same position as the position where the data was recorded, so that the reading device with low reading performance cannot read the data. It is possible to put magnetic data in a poor recording state into a good recording state that can be read by a reader with low reading performance. Kill. For example, even a magnetic recording medium that has already dropped out can be restored to a good recording state without dubbing.

The magnetic recording medium in which the magnetic data is rewritten according to the present invention has a low possibility of dropout. Further, since the performance of the data reading device can be lowered, the cost of the device can be reduced. For example, magnetic data written with low accuracy by a camera
With the laboratory data reading / writing apparatus according to the present invention, if the magnetic recording medium is written with high precision and accuracy,
It is possible to read data normally even with a device for household use with low data reading performance. Therefore, the reading performance of a reading device used in a commonly used household device can be reduced, and according to the present invention, the cost of such a device can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between film frames and shooting modes that can be used in an embodiment of the present invention.

FIG. 3 is a diagram showing a form of magnetic data in a magnetic recording portion of a film used in an embodiment of the present invention.

FIG. 4 is a flowchart showing a part of the control operation of the first embodiment of the present invention.

FIG. 5 is a flowchart showing a part of the control operation of the first embodiment of the present invention.

FIG. 6 is a flowchart showing a modified example of a control operation for writing modified data according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing a rewinding control operation of a film that has already been shot in the first embodiment of the present invention.

FIG. 8 is a block diagram showing the configuration of a second embodiment of the present invention.

FIG. 9 is a block diagram showing a flow of a configuration for reading / writing in the configuration of the second embodiment.

FIG. 10 is a block diagram showing the configuration of a third embodiment of the present invention.

FIG. 11 is a block diagram showing the flow of a configuration for reading / writing in the configuration of the third embodiment.

[Explanation of symbols]

1 ... Microcomputer 2 ... Exposure device 3 ... Photometry device 4 ... Feed amount detection device 5 ... Film feeding device 6 ... Memory 7 ... Magnetic reproducing device 8 ... Magnetic recording device 9 ... Display device 11 ... Microcomputer 12 ... Memory 13 ... Film Feeding device 14 ... Writing unit 15 ... Erase unit 16 ... Read unit 17 ... Signal conversion unit 18 ... Input device 19 ... Display device HW ... Write head HE ... Erase head HR ... Read head HRW ... Read / write head S _CHG … Data change switch S _CNT … Number of prints setting switch S _MOD … Shooting mode selection switch S _REL … Release switch FL… Film MR… Magnetic recording part PR… Photo reflector PF… Perforation

Claims (1)

[Claims] 1. A reading unit for reading data digitally recorded on a magnetic recording medium, a writing unit for digitally recording data on the magnetic recording medium, and a reading unit for reading data from the magnetic recording medium. The data read by is decoded and the error correction of the data is performed using an error correction code, and when the data is digitally recorded on the magnetic recording medium, the error-corrected data is encoded and A signal converting means for adding an error correction code and a control means for controlling the data read by the reading means to be written again by the writing means at a position substantially the same as the position where the data was recorded. Data reading characterized by:
Writing device.