JPH0545719A - Information recording method - Google Patents

Abstract

PURPOSE:To obtain the information recording method which can decrease the generation of the reproduction defect of recorded information. CONSTITUTION:The 1st signal 100 having a 1st part changing in a prescribed direction and a 2nd part changing in the direction different from the changing direction of the 1st part upon lapse of the prescribed time from the point of the time when the 1st part changes is corresponded to the bit of a value '0'. The 2nd signal having the 1st part changing in the prescribed direction, the 2nd part changing in the direction different from the changing direction of the 1st part upon lapse of the prescribed time from the point of the time when the 1st part changes, a 3rd part changing in the direction different from the changing direction of the 1st part between the 1st part and the 2nd part, and a 4th part changing in the same direction as the changing direction of the 1st part between the 3rd part and the 2nd part is corresponded to the bit of a value '1'. The information is recorded in the magnetic recording part of the photographic film by the writing signal formed by combining the 1st signal 100 and the 2nd signal 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording method for recording information on a magnetic recording section.

[0002]

2. Description of the Related Art A photographic film, particularly a negative film, is coated with a transparent magnetic material to form a magnetic recording portion along the transport direction of the negative film. It has been proposed to record information on the printed image in the magnetic recording section (for example, International Publicat
ion Number WO 90/04205). According to this, the information about the image can be recorded in the magnetic recording portion of the portion physically corresponding to the image frame in which the image is recorded, and thus the trouble of searching for information can be saved. In the magnetic recording unit, for example, the shooting date and time of each image, the shooting location, the shooting conditions, and the like can be recorded when shooting with a camera. Also, in the laboratory, the image frames were tested with a negative tester and the correction values for the exposure conditions were recorded in the magnetic recording section, or the printing conditions and correction values were taken into consideration when printing on photographic paper with a printer or the like. It is possible to record the exposure conditions and the like for each image frame. Therefore, at the time of reordering, the printing process can be performed under the same conditions by reading the recorded exposure conditions and the like.

Information is recorded in the magnetic recording portion by, for example, as shown in FIG. 10 (A), a signal 2 in which a falling pulse exists before 1/2 of the interval between two rising pulses.
00 and a signal 202 in which a falling pulse exists after ½ of the above interval, a so-called tri-bit method is used. In the tri-bit method, the signal 200 is associated with "0" and the signal 202 is associated with "1", and a write signal representing the information to be recorded is created by combining the two signals. The created write signal is supplied to the magnetic head,
Magnetic recording of the information is performed. When the information recorded in the magnetic recording unit is reproduced, the signal 200 is reproduced as the reproduced signal 204 and the signal 202 is reproduced as the reproduced signal 206, as shown in FIG. Playback signal 204, 2
The pulses 208 and 210 of 06 are used as a clock for synchronization, and the value of the bit corresponding to each reproduction signal is “0” or “1” depending on the position of the pulse 212 existing between the pulse 208 and the pulse 210. Is determined.

By the way, when reproducing magnetically recorded information on a magnetic recording medium, unevenness in the conveying speed of the magnetic recording medium, information dropout (bit loss) due to defects or dust on the medium, noise from the outside, etc. As a result, data may be lost, data may be garbled, and reproduction failure such as synchronization error may occur. In particular, when a synchronization error occurs in which a clock is deviated during reproduction and during recording, a large amount of data may be lost due to reproduction failure. In order to solve this, in each field of digital audio, wireless communication, and computer, information is recorded by PLL, clock detection, etc.
The unevenness of transport during reproduction is suppressed to a certain level or less, and the error detection and error correction techniques typified by parity check and the like are incorporated to reduce the occurrence of reproduction defects as described above.

However, in the field of photographic processing, recording and reproduction of information on the magnetic recording portion of photographic film is performed by each device in each step of photographic processing, but the standards of each device are not unified, etc. Disturbances such as uneven transport speed during reproduction and recording and noise mixing are likely to occur. On the other hand, information recording by the tri-bit method is easily affected by disturbance such as uneven transportation, and there is a high possibility that defective reproduction will occur.

That is, in the tri-bit method, the position of the pulse 212 of the reproduction signals 204 and 206 easily moves due to uneven carrier speed. Therefore, FIG. 11 (A)
If the position of the pulse 212 of the reproduction signal 204 corresponding to “0” is in the area E as shown in (4), it is determined that the bit value is “0”, but if it moves into the area F due to uneven transportation, etc. It becomes impossible to judge the value of the bit, and one bit of data is lost. Also, the pulse 21
When the position of 2 moves into the area G, the bit value becomes "1".
An error (garbled data) that is erroneously determined to be occurs. This also applies to the reproduction signal 206 corresponding to "1" shown in FIG.

In addition, in the tri-bit system, FIG.
In the reproduction signal as shown in (C), when the pulse 216 or the pulse 220 is dropped out (disappeared), the value of the bit corresponding to the corresponding reproduction signal 204 or reproduction signal 206 cannot be determined. When the pulse 218 representing the clock drops out, the position of the pulse 218 can be estimated from the pulses 214 and 222 before and after representing the clock.

Further, when only the noise 224 is mixed in as shown in FIG.
It is possible to determine that 04 is "0", but if noise 226 is further added, 1-bit data "0" is erroneously determined to be 2-bit "10", and 1-bit data is inserted. become. When only the noise 226 or the noise 228 is mixed, the corresponding reproduction signal 2
04 or the value of the bit corresponding to the reproduction signal 206 cannot be determined. Further, when only the noise 230 is mixed, it can be estimated that the reproduction signal 206 is “1”, but when the noise 228 is further added, the reproduction signal 206 is erroneously determined as “10”.

As described above, in the tri-bit method, when a disturbance such as uneven transport, dropout, or noise occurs, there is a high probability that an error such as data loss or data corruption will occur. Was not preferable as the recording method.

Further, there is a frequency modulation system (hereinafter referred to as FM system) as a recording system other than the tribit system.
In this FM system, as shown in FIG. 12 (A), a signal 23 composed of a pair of pulses which are separated by a constant interval and have different changing directions.
2 and a signal 234 in which a pulse that changes in a direction different from the predetermined direction is inserted between a pair of pulses that change in a predetermined direction and are separated by a constant interval. Information is recorded in the same manner as above with 234 corresponding to "1". As shown in FIG. 12B, when the information recorded in the magnetic recording unit is reproduced, the signal 2
32 is a reproduction signal 236, and signal 234 is a reproduction signal 2
Played as 38.

In this FM system, the value of the corresponding bit is determined by determining whether or not a pulse is present between the pulse pair representing the clock of the reproduction signal, so the value is determined from the position of the pulse. Compared to the tribit method, it is less affected by uneven transport speed. For example,
In the reproduction signal by the FM system as shown in FIG. 13A, the pulse 240 of the reproduction signal 236 corresponding to “0”.
When the position of is in the area H, the bit value is determined to be "0", and the bit value is estimated to be "0" even if the bit moves to the area I due to uneven transportation. You can The area consisting of the area H and the area I is obviously larger than the area E in the above-mentioned tri-bit method, and it can be said that the area is less susceptible to the uneven transport speed.

When the position of the pulse 240 moves into the area J, the pulse 242 of the reproduction signal 238 is determined to be a pulse representing a clock, and the bit value is erroneously determined to be "1", and the clock is set to "1". A synchronization error occurs in which a pulse existing between the represented pulses is erroneously recognized as a pulse representing a clock, but the occurrence of the synchronization error is detected when a bit having a value of "0" is present in the subsequent bit string. can do. Even if the position of the pulse 242 of the reproduction signal 238 moves within the area K, the bit value of the reproduction signal 238 is determined to be "1".

Further, in the case of the reproduced signal by the FM system as shown in FIG. 13B, when the pulse 248 drops out, the reproduced signal 252 has an impossible waveform, so that the dropout can be detected. .. Also,
Similarly, when the pulse 246 or the pulse 250 is dropped, the reproduced signal 254, 252 or the reproduced signal 252, 256 respectively has an impossible waveform, and the dropout can be detected. However, the pulses 246, 2
When 48 disappears at the same time, the position of the pulse 246 can be estimated by the pulse 244 and the pulse 250, and the position of the pulse 248 can be estimated by the estimated pulse 246 and the pulse 250. 2 bits corresponding to the reproduced signals 254 and 252 may be regarded as 1 bit, and "01" may be erroneously determined as "0". In this case, 1-bit data is lost.
However, by inserting data (eg, a reproduction signal corresponding to “0”) representing a delimiter at a predetermined interval, it is possible to prevent the data from being lost.

When noise 258 or noise 260 is mixed in the FM system reproduction signal 236 as shown in FIG. 13C, it can be determined that the noise is noise. However, when noises 258 and 260 are mixed in at the same time, and uneven transport occurs (see FIG. 13D).
, The reproduction signal 236 corresponding to “0” is erroneously determined to be “1”, the noise 260 is erroneously recognized as a pulse representing a clock, and a synchronization error occurs.

The following table shows the reproduction failure that occurs depending on the disturbance in the tri-bit system and the FM system.

[0016]

[Table 1]

As described above, the FM system is less affected by the uneven transport speed as compared with the tri-bit system, but a large amount of data is lost when the uneven transport and dropout or noise mixing occur at the same time. There may be a synchronization error that leads to it.

The present invention has been made in view of the above facts, and an object thereof is to obtain an information recording method capable of reducing the occurrence of defective reproduction of recorded information.

[0019]

The invention according to claim 1 is
A first part that changes in a predetermined direction; and a second part that changes in a direction different from the changing direction of the first part after a predetermined time elapses from the time when the first part changes A signal, a first portion that changes in a predetermined direction, a second portion that changes in a direction different from the changing direction of the first portion after a predetermined time elapses from the time when the first portion changes, and the first portion A third portion that changes in a direction different from the changing direction of the first portion between the first portion and the second portion;
A fourth portion that changes in the same direction as the changing direction of the first portion between the second portion and the second portion.
When the first signals are adjacent to each other, one first portion and the other second portion are common,
When the second signals are adjacent to each other, one first portion and the other second portion are common, and when the first signal and the second signal are adjacent to each other, the first signal Information is written in the magnetic recording portion by a write signal created so that the second portion and the first portion of the second signal or the first portion of the first signal and the second portion of the second signal are common. To record.

According to a second aspect of the present invention, there is provided a first portion which changes in a predetermined direction and a first portion which changes in a direction different from the changing direction of the first portion after a lapse of a predetermined time from the time when the first portion changes. A first signal having a second portion, a first portion that changes in a predetermined direction, and a direction different from the changing direction of the first portion after a predetermined time has elapsed from the time when the first portion changed. A second portion that changes, a third portion that changes between the first portion and the second portion in a direction different from the changing direction of the first portion, the third portion, and the third portion. Second
And a second signal having a fourth portion that changes in the same direction as that of the first portion between the first signal and the second signal. One first portion and the other second portion are common, and when the second signals are adjacent to each other, one first portion and the other second portion are common, The second part of the first signal and the first part of the second signal or the first part of the first signal and the second part of the second signal when the signal and the second signal are adjacent to each other A plurality of signal groups consisting of a predetermined number of signals are made common such that the first portion is common to the second portion at the rear end of the signal group, and the second portion is the next signal group. Information is recorded in the magnetic recording portion by a write signal created by inserting the first signal so as to be common to the first portion of the.

[0021]

According to the first aspect of the invention, as shown in FIG. 1A, the first portion changes in a predetermined direction and the first portion after a predetermined time elapses from the time when the first portion changes. A first signal 100 having a second part that changes in a direction different from the direction of change, a first part that changes in a predetermined direction, and a predetermined time after a time when the first part changes. A second portion changing in a direction different from the changing direction of the first portion, and a third portion changing between the changing direction of the first portion and the changing direction of the first portion between the first portion and the second portion. And a fourth portion changing between the third portion and the second portion in the same direction as the changing direction of the first portion. Write signals are created in combination.

First signal 100 and second signal 102
Respectively correspond to 1 bit of binary data, for example, the first
Of the second signal 102 to the bit of the value “0”
By associating with the bit of the value “1”, the information to be recorded in the magnetic recording portion can be expressed by the combination of the first signal 100 and the second signal 102. Further, since the second portions of the first signal 100 and the second signal 102 change after a predetermined time elapses from the time when the first portion changes, the first portion and the second portion are used as clocks. Can be adapted.

When the first signal 100 and the second signal 102 are recorded and reproduced in the magnetic recording section, the reproduction signal 104 and the reproduction signal 106 shown in FIG. 1B are obtained. When the first portion and the second portion are made to correspond to the clocks as described above, in the reproduced signals 104 and 106, the pulses 10 generated at the constant intervals corresponding to the first portion and the second portion are generated.
8, 110 represents the clock and pulse 10
Since it is possible to determine the value of the corresponding bit by determining whether or not the pulses 112 and 114 are present between 8 and 110, as compared with the above-mentioned FM method, the carrier speed is compared with the tri-bit method. Less susceptible to unevenness. For example, in the reproduction signal as shown in FIG. 2 according to the present invention, the pulse 1 of the reproduction signal 116 corresponding to “0”
When the position of 18 is located in the area A, the bit value is determined to be "0", and the bit value is estimated to be "0" even if the position is moved to the area B due to uneven transportation. be able to. The area consisting of the area A and the area B is obviously larger than the area E in the above-mentioned tri-bit method, and it can be said that the area is less affected by the uneven transport speed.

When the position of the pulse 118 moves into the area C, the pulse 122 of the reproduction signal 120 is determined to be a pulse representing a clock, and the bit value is erroneously determined to be "1", and the FM method is used. A synchronization error occurs as in, but
Detecting the occurrence of the synchronization error at the time when the reproduction signal (here, the reproduction signal 121 corresponding to the bit whose value is "0") corresponding to the first signal 100 existing in the following signal is reproduced. You can That is, in the reproduction signal 104, the interval between the pulses 108 and 110 is made equal to the clock cycle T, so that the reproduction signal 10 is generated in the state where the synchronization error occurs.
4 is reproduced, a pulse is not detected at the timing recognized as a clock (timing shown by the imaginary line in FIG. 2), but a pulse is detected at a timing different from the above timing, and the signal waveform at that time is also the reproduced signal 104. 10,
It will be different from 6. This makes it possible to detect that a synchronization error has occurred. Even if the position of the pulse 124 of the reproduction signal 120 moves within the area D, the bit value of the reproduction signal 120 is determined to be “1”.

Further, in the reproduction signal shown in FIG. 3, when the pulse 128 representing the clock drops out, the position of the pulse 128 can be estimated by the pulses 126 and 134 also representing the clock. Also,
Playback signal 1 when pulse 130 drops out
36 is an unlikely waveform consisting of pulses 128, 132, 134 and pulse 130 can be estimated.
However, if the pulse 132 is determined to be noise, the value of the bit corresponding to the reproduction signal 136 may be erroneously determined to be “0”. If the pulses 128 and 130 are dropped out, the pulses 128 and
Can be estimated, and the estimated pulse 128 causes the reproduced signal 136 to have an impossible waveform, so that the pulse 130 can be estimated. Also, pulse 13
If 0 or 132 drops out, the playback signal 1
The value of the bit corresponding to 36 is erroneously determined to be "0".

Further, in the reproduction signal as shown in FIG. 4A according to the present invention, noise 138 or noise 140 is generated.
When is mixed, it can be determined that it is noise. Further, even when the noises 138 and 140 are mixed in at the same time, it can be determined that the noise is generated when the conveyance unevenness does not occur. Furthermore, in the above case, when uneven transport occurs (see FIG. 4B), the value of the bit corresponding to the reproduction signal 142 is erroneously determined to be "1". In this case as well, the pulse 144 is a pulse representing a clock. Therefore, unlike the FM method, a synchronization error does not occur and data is not lost. Therefore, it is possible to correct the error by the technique of error detection and error correction. In the present invention, the following table shows the defective reproduction that occurs depending on the disturbance.

[0027]

[Table 2]

As described above, according to the first aspect of the present invention, the tri-bit method and the FM are not affected by the unevenness of the carrying speed, and the synchronization error does not occur when the noise is mixed and the uneven carrying occurs. It is possible to reduce the occurrence of defective reproduction of recorded information as compared with the system.

According to the second aspect of the invention, the writing is made by combining the first signal and the second signal to create a plurality of signal groups and inserting the first signal between the plurality of signal groups. Information is recorded in the magnetic recording unit by a signal. This makes the second
2 is recorded, the reproduction signal pulse is reproduced by the reproduction signal 11 of FIG.
Even if the position moves into the region C and the synchronization error occurs like the pulse 118 of No. 6, the synchronization error occurs at the time when the reproduction signal corresponding to the first signal is reproduced as described above. Can be detected. Therefore, the amount of data lost when a synchronization error occurs is the maximum amount of data corresponding to the single signal group, so that the amount of data lost when a synchronization error occurs can be reduced.

[0030]

Embodiments of the present invention will now be described in detail with reference to the drawings. 5 and 6 show a negative film 10 according to this embodiment. The negative film 10 is provided with an emulsion layer 14 on the upper surface of the transparent base 12 in FIG. 6 so that an image is exposed and recorded. On the lower surface of the transparent base 12 in FIG. 6, a magnetic recording layer 16 coated with a transparent magnetic material is provided. As shown in FIG. 5, the magnetic recording layer 16 is provided on the entire surface of the negative film 10, the recording tracks are formed along the longitudinal direction of the negative film 10, and the image frame 1 at the leading end of the negative film 10 is formed.
Tracks S1 and S2 where 0A is not recorded and tracks T1 and T provided corresponding to each image frame 10A
It is composed of two.

The tracks S1 and S2 are areas for recording necessary information for each of the negative films 10, and the track T
Areas 1 and T2 are areas for recording necessary information for each image frame 10A. At the leading and trailing ends of each track, a clock signal created so as to reproduce a reproduction signal in which pulses of a constant cycle are continuous is magnetically recorded in a non-photographed state, that is, in the manufacturing stage. This clock signal is used when recording and reproducing information on each track of the negative film 1
It is used to detect a transport speed of zero. Further, the tip positions of the tracks S1 and S2 and the respective tracks T1 and T2
One perforation 11 is provided at the tip position of each corresponding to the image frame 10A. In addition, the negative film 10 is attached to the tip of the negative film 10.
Is provided with a plurality of perforations 13 for hooking on the claws of a sprocket (not shown) and pulling out.

FIG. 7 shows a camera 50 and a photo printing apparatus 60 according to this embodiment. The camera 50 is equipped with a cartridge 28 on one side of which the negative film 10 is wound around a spool 52 and accommodated therein. The camera 50 is provided with a drive reel 54 driven by the motor 30 (see FIG. 8). Negative film 10
Is transported with its tip portion hooked on the drive reel 54,
The image is taken. The negative film 10 on which the photographing of a predetermined frame is completed is rewound onto the spool 52 of the cartridge 28. As shown in FIG. 8, the motor 30 is connected to the control circuit 32, and the operation is controlled by the control circuit 32.

The control circuit 32 has a lens 34 (see FIG. 7).
An optical system 36 including a shutter (not shown) is connected, and the operation of the optical system 36 is controlled to record an image on the negative film 10. In addition, the control circuit 32 includes
Information representing the shooting conditions for each image frame 10A, such as the aspect ratio of the image frame 10A recorded on the negative film 10, the exposure at the time of shooting, and the light source information, is input by the optical system 36 after the image frame 10A is shot. Further, the camera 50 is provided with an operation unit 38. Information such as a user ID, a name, an address and the like, a title, a keyword, a shooting place and the like is input from the operation unit 38 by a manual operation.

A magnetic head 56 is provided inside the camera 50 so as to correspond to the magnetic recording layer 16 of the negative film 10, that is, each track. The magnetic head 56 is
Control circuit 32 via recording current amplifier 40 and modulator 42
It is connected to the. The control circuit 32 inserts a bit having a value “0” for each byte into the information (binary data) input from the optical system 36 and the operation unit 38, and the modulator 42 when the negative film 10 is conveyed by the motor 30. Output to. In the modulator 42, the input data is expressed as "0" by the first signal 100 and "1" by the second signal 102 (see FIG. 1A described in the section of operation), and the first signal The combination of 100 and the second signal 102 is converted into a write signal expressing binary data. By supplying this write signal to the magnetic head 56 after being amplified by the recording current amplifier 40,
The information is recorded on each track.

The first signal 100 has a first portion that changes to a predetermined polarity and a second portion that changes to a polarity opposite to the predetermined polarity after a lapse of a predetermined time from the time when the first portion changes. And a part. Also, the second signal 102
Is a first portion that changes to a predetermined polarity, a second portion that changes to a polarity opposite to the predetermined polarity after a lapse of a predetermined time from the time when the first portion changes, the first portion and the first portion. A third portion that changes to a polarity opposite to the predetermined polarity between the second portion and a fourth portion that changes to the predetermined polarity between the third portion and a second portion; Is equipped with.

The magnetic head 56 is capable of reproducing information magnetically recorded on each track. When reproducing the magnetically recorded first signal 100 and second signal 102,
A reproduction signal 104 and a reproduction signal 106 as shown in FIG. 1B are obtained respectively. The reproduced signals 104 and 106 have pulse pairs 108 and 110 of different polarities which appear at regular intervals, and the pulses 108 and 110 represent clocks. In addition, the reproduction signal 106 is the pulses 108, 11
Pulse pairs 112 and 114 having different polarities are generated between 0, and it is possible to determine whether the binary data is “0” or “1” depending on the presence or absence of the pulses 112 and 114. The reproduction signal is amplified by the amplifier 44 and then input to the control circuit 32.

The negative film 10 for which photographing has been completed is rewound into the cartridge 28, taken out from the camera 50, developed, fixed, washed with water and dried, and then loaded into a predetermined position of the photographic printing apparatus 60.

In the photoprinting apparatus 60, a negative carrier 64 is arranged on the optical axis of a light source 62 which is irradiated during printing. The negative carrier 64 is provided with a drive roller (not shown) that is rotated by the drive force of the drive unit 66 connected to the control circuit 78, and the negative film 10 is moved in the direction of arrow A in FIG. 7 by this drive roller. Be transported. Also,
A solenoid 68 is provided on the negative carrier 64, and the negative film 10 can be clamped and pressed at the printing position by a signal from the control circuit 78.

C is provided between the light source 62 and the negative carrier 64.
Each MY filter 70 is interposed, and each filter appears and disappears on the optical axis according to the exposure amount for each color. The light rays that have passed through the negative film 10 pass through the lens 72 and the photographic paper 7
4 and the image is printed on the photographic printing paper 74. A shutter 76 is interposed between the photographic printing paper 74 and the lens 72 and is retracted from the optical axis at the time of exposure by a signal from the control circuit 78. Further, a reproducing head 80 is arranged on the upstream side of the negative carrier 64 on the conveying path of the negative film 10. The reproducing head 80 can reproduce the information magnetically recorded on each track by the magnetic head 56 of the camera 50. Playback head 80
The output terminal of the reproducing head 8 is connected to the amplifier 82.
The weak signal output from 0 is amplified and output. The output terminal of the amplifier 82 is connected to the control circuit 78.

A recording head 92 for magnetically recording information on each track of the magnetic recording layer 16 is provided downstream of the negative carrier 64. The control circuit 78 is the photoprinting device 6
Information indicating the exposure conditions and the like when the printing process is performed with 0 is output to the modulator 88. The modulator 88 converts the signal "10 ..." From the control circuit 78 into a write signal in the same manner as described above, and outputs the write signal to the recording current amplifier 90. Recording current amplifier 9
At 0, the optimum recording current is supplied to the recording head 92.

Next, the operation of this embodiment will be described. Camera 5
When the cartridge 28 is loaded in 0, the camera 50 pulls out the negative film 10 from the cartridge 28. Next, in the binary data (for example, see FIG. 9A) representing the information about the camera model and the negative film 10 which are magnetically recorded on the tracks S1 and S2, the bit 144 of the value "0" is byte by byte.
Is inserted (see FIG. 9B), and bits for error detection such as parity check are added. In the modulator 42,
A write signal represented by the first signal 100 and the second signal 102 is created based on the data to which the bit for error detection is added (see FIG. 9C). In creating this write signal, when the first signals 100 are adjacent to each other, one first portion is common to the other second portion, and when the second signals 102 are adjacent to each other. One first
Of the first signal 10
0 and the second signal 102 are adjacent to each other, the first signal 1
The second part of 00 and the first part of the second signal 102 or the first part of the first signal 100 and the second part of the second signal 102 are made common.

The write signal generated by the modulator 42 is supplied to the magnetic head 56, and information is magnetically recorded on the tracks S1 and S2. At the time of shooting, a write signal representing information such as shooting conditions is created in the same manner as described above, and is magnetically recorded on tracks T1 and T2 provided corresponding to the shot image frames. Negative film 10 after the number of shots has been taken
Is rewound into the cartridge 28 and brought to a DPE store for development and printing.

Negative film 10 accepted at the DPE store
Has undergone development, fixing, washing, and drying in the lab.
Next, in the case of simultaneous printing, the photo printing device 60 is loaded at a predetermined position.

When the cartridge 28 is loaded, the driving unit 66 of the negative carrier 64 in the photographic printing apparatus 60 starts to convey the negative film 10. When the track S1 reaches the position where the reproducing head 80 is provided, the reproducing head 80 reproduces the clock signal. The control circuit 78 controls the drive unit 66 based on the reproduced clock signal so that the transport speed of the negative film 10 becomes a certain value or more.

When the transport speed exceeds a certain value, the reproduction of the information magnetically recorded on each track is started, whereby a reproduction signal as shown in FIG. 9D is obtained. The control circuit 78 determines whether or not a pulse exists between the pulses representing the clock of the reproduction signal, determines the value of each bit, and reproduces the magnetically recorded information.

Here, as shown in FIG. 9 (E), when the conveyance speed unevenness of the negative film 10 occurs and the interval between the pair of pulses 146, 148 of the reproduction signal corresponding to "0" is shortened. Judges that the pulse 152 of the reproduction signal 150 is a pulse representing a clock and erroneously judges that the bit value is "1", and a synchronization error occurs as in the FM system. However, the occurrence of the synchronization error can be detected at the time when the reproduction signal 154 corresponding to the value “0” bit inserted for each byte is detected. Therefore, only one byte of data is lost at the maximum.

Further, as shown in FIG. 9 (F), noise 1
56 and the noise 158 are mixed, and when the reproduction signal in which the interval between the pulse 160 and the noise 158 is substantially equal to the interval of the clock is obtained due to the uneven transport, the reproduction signal 1
The value of the bit corresponding to 62 is erroneously determined as "1". However, in this case, since the pulse 148 is recognized as a pulse representing a clock, unlike the FM system, a synchronization error does not occur and data is not lost. Therefore, it is possible to correct the erroneous judgment by the error detection bit and accurately reproduce the information.

The control circuit 78 extracts the bit of the value "0" inserted for each byte from the reproduced information, reproduces the information representing the photographing condition, and performs the burning process based on the information. That is, the densities of the image frames are measured by a densitometer (not shown), the exposure conditions are set based on the measured density values and the information indicating the photographing conditions, and the image frames 10A are sequentially positioned at the printing position and set. The image recorded on the negative film 10 is printed on the photographic printing paper 74 under the above exposure conditions.
After the printing process, information such as the exposure conditions and print designation is recorded on each track via the modulator 88, the recording current amplifier 92, and the recording head 92. The information recorded by the photoprinting device 60 is reproduced in the same manner as described above in a post process and used for various processes.

Although the information recording method of the present invention is applied to the camera 50 and the photo printing apparatus 60 in this embodiment, the present invention is not limited to this, and magnetic recording is performed in the photo processing step. It can be applied to each device that reproduces and records information on each track of the layer 16.

In this embodiment, the binary data is represented by associating the first signal 100 with "0" and the second signal 102 with "1". However, the first signal 100 is represented by "0". 1 "
Alternatively, the second signal 102 may be made to correspond to “0”.

Further, in this embodiment, bit 1 of value "0"
However, the present invention is not limited to this, and the bit 144 of the value “0” may be inserted every 2 bytes or every 4 bits. Good.

In this embodiment, the case where information is magnetically recorded in the magnetic recording portion provided on the negative film 10 has been described as an example. However, the present invention is not limited to this, and serially recorded on the magnetic recording medium. It can be applied to all cases in which binary data is recorded.

[0053]

As described above, according to the first aspect of the invention, the first portion changing in the predetermined direction and the changing direction of the first portion after a lapse of a predetermined time from the time when the first portion changes A first signal having a second portion that changes in a different direction, a first portion that changes in a predetermined direction, and a first portion after a lapse of a predetermined time from the time when the first portion changes A second part that changes in a direction different from the direction in which
Between the third portion and the second portion, the third portion changing between the first portion and the second portion in a direction different from the changing direction of the first portion, and between the third portion and the second portion. A fourth signal changing in the same direction as the changing direction of the first part and a second signal having a fourth part are combined to create a write signal,
Since the information is recorded in the magnetic recording portion, it is possible to reduce the occurrence of defective reproduction of the recorded information, which is an excellent effect.

According to the second aspect of the invention, the writing is performed by combining the first signal and the second signal to create a plurality of signal groups and inserting the first signal between the plurality of signal groups. Since the information is recorded in the magnetic recording portion by the signal, it is possible to reduce the occurrence of defective reproduction of the recorded information, which is an excellent effect.

[Brief description of drawings]

FIG. 1A is a waveform diagram showing a first signal and a second signal according to the present invention, and FIG. 1B is a waveform diagram showing a reproduced signal of the first signal and the second signal.

FIG. 2 is a waveform diagram illustrating an operation when carrier unevenness occurs during reproduction of a signal to which the present invention is applied.

FIG. 3 is a waveform diagram illustrating an operation when dropout occurs during reproduction of a signal to which the present invention is applied.

FIG. 4A and FIG. 4B are waveform charts for explaining an operation when noise is mixed during reproduction of a signal to which the present invention is applied.

FIG. 5 is a plan view of a negative film according to this example.

6 is a cross-sectional view of the negative film taken along line VI-VI of FIG.

FIG. 7 is a schematic configuration diagram of a photographic processing system according to the present embodiment.

FIG. 8 is a block diagram showing a schematic configuration of a camera.

9A and 9B are explanatory diagrams for explaining bit insertion, and FIGS. 9C to 9F are waveform diagrams for explaining the operation of the present embodiment.

10A is a waveform diagram showing a tri-bit type signal, and FIG. 10B is a waveform diagram showing a reproduction signal of the signal.

FIGS. 11A to 11D are waveform diagrams of a reproduction signal for explaining an error that occurs when there is a disturbance in the tri-bit method.

FIG. 12A is a waveform diagram showing an FM system signal;
(B) is a waveform diagram showing a reproduction signal of the signal.

13A to 13D are waveform diagrams of reproduced signals for explaining an error that occurs when there is a disturbance in the FM system.

[Explanation of symbols]

 10 negative film 16 magnetic recording layer 56 magnetic head 80 reproducing head 92 recording head 100 first signal 102 second signal 104 reproducing signal 106 reproducing signal

Claims (2)

[Claims] 1. A first part that changes in a predetermined direction, and a second part that changes in a direction different from the changing direction of the first part after a predetermined time has elapsed from the time when the first part changed.
A first signal that changes in a predetermined direction, and a second signal that changes in a direction different from that of the first signal after a predetermined time has elapsed from the time when the first signal changed. A portion, a third portion changing between the first portion and the second portion in a direction different from a changing direction of the first portion, the third portion and the second portion A second signal having a fourth portion that changes in the same direction as the changing direction of the first portion between, and one of the first signals when the first signals are adjacent to each other. When the first signal and the second signal on the other side are common and the second signals are adjacent to each other, the first signal on one side and the second signal on the other side are common, and the first signal and the second signal are If the two signals are next to each other, the second part of the first signal and the first part of the second signal or the first part of the first signal and the second signal Information recording method for recording information on a magnetic recording unit by a write signal generated as the second portion is common. 2. A first portion changing in a predetermined direction, and a second portion changing in a direction different from the changing direction of the first portion after a predetermined time has elapsed from the time when the first portion changed,
A first signal that changes in a predetermined direction, and a second signal that changes in a direction different from that of the first signal after a predetermined time has elapsed from the time when the first signal changed. A portion, a third portion changing between the first portion and the second portion in a direction different from a changing direction of the first portion, the third portion and the second portion A second signal having a fourth portion that changes in the same direction as the changing direction of the first portion between, and one of the first signals when the first signals are adjacent to each other. When the first signal and the second signal on the other side are common and the second signals are adjacent to each other, the first signal on one side and the second signal on the other side are common, and the first signal and the second signal are If the two signals are next to each other, the second part of the first signal and the first part of the second signal or the first part of the first signal and the second signal A plurality of signal groups consisting of a predetermined number of signals so that the second part of the signal groups is common, the first part is common to the second part at the rear end of the signal group, and the second part is An information recording method for recording information in a magnetic recording section by a write signal created by inserting the first signal so as to be common to the first portion of the signal group.