JPH095858A - Magnetic recorder for camera - Google Patents

Abstract

PURPOSE: To accurately record magnetic data in a limited region on a film by a PPM recording system, even if the feeding of a film becomes irregular, at the time of feeding the film. CONSTITUTION: This magnetic recorder for a camera is constituted to provide at least a driven roller rotation detecting circuit 2 for generating an encode pulse signal, in accordance with a fed film quantity, a timer part 19 which is updated in response to the period of the encode pulse signal and generate a synchronous clock signal for recording data, a magnetic head 6 for recording the data in a magnetic recording part on the film 11, according to the synchronous clock signal and the data to be recorded and a CPU 1 for permitting the updating of the period of the synchronous clock signal, when the recording of minimum unit data is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording apparatus of a camera for magnetically recording photographing information such as date and exposure value on a film by a pulse position modulation recording system or the like.

[0002]

2. Description of the Related Art Heretofore, various techniques have been proposed for a magnetic recording device for a camera which records various kinds of information at the time of photographing by a camera on a magnetic recording layer of a film and employs the information for exposure control at the time of printing. . As an example of such a magnetic recording method, for example, pulse position modulation (PPM; Pulse Position Mo
dulation) There is a recording method.

FIG. 22 shows the signal waveform of the PPM recording method, which will be described. In this PPM recording method, "0" and "1" are discriminated by the position where the signal waveform changes in one signal cycle, that is, the trailing position of the signal waveform in FIG. Specifically, the case where there is a change in the signal waveform from the beginning of the signal cycle to the half of the signal cycle is "0", and the case where there is a change in the signal waveform after the half is "1". As a result, even if the signal cycle varies due to, for example, uneven feeding of the film, the data is "1" or "0" depending on whether the change in the signal waveform is in the first half or the second half of the signal cycle. It is possible to determine whether or not. Further, according to this PPM recording method, even if the position of the change of the signal waveform during the signal period is slightly deviated, it is "1" or "0" if the position of the change of the signal waveform is in the first half or the latter half. It is possible to determine

On the other hand, in Japanese Patent Laid-Open No. 165090/1993, a "data recording device for a camera for performing a magnetic recording by synchronizing a time width of a signal of a film driven roller into N equal parts to create a synchronous clock and synchronizing with the synchronous clock. Is disclosed.

The operation of the "camera data recording apparatus" of the PPM recording system according to this conventional technique will be described below with reference to the schematic configuration diagram of FIG. 1 and the flowchart of FIG. When a release button (not shown) is pressed and the exposure is completed, the feeding of the film 11 is started. The driven roller 8 rotates in response to the movement of the film 11, is detected by the driven roller rotation detection unit 7, is processed by the driven roller rotation detection circuit 2, and the encode pulse is input to the CPU 1. The CPU 1 waits until a predetermined number of encode pulses are input, and when a predetermined number of encode pulses are input, predicts the time width of the next encode pulse from the input encode pulse, A timing is set in which the time width of the predicted encode pulse is 1 / N, and the magnetic head 6 is driven based on the timing.
Magnetic data is recorded on the upper side, and magnetic recording is performed based on the above timing until N-bit magnetic data is recorded.
When the recording of the N-bit data is completed, the rotation of the driven roller 8 is detected again, the timing by the new encode pulse is created, and the magnetic recording is performed based on the timing. The above steps are repeated until the recording of all data is completed. When the recording of all data is completed, the film 11 is fed and stopped until the next frame is set at the exposure position (steps S301 to S318).

[0006]

However, as shown in FIG. 24, the magnetic data recording apparatus disclosed in Japanese Unexamined Patent Publication No. 5-165090 must record N-bit magnetic data during one cycle of the encode pulse. Although it has to be done, as shown in FIG. 25, the timing of magnetic recording is actually created by the preceding encoding pulse.

Therefore, as shown in FIGS. 26A to 26D, when the time width of the encode pulse varies due to uneven feeding of the film 11, the uneven feeding is taken into consideration. Since it seems impossible to predict the next encode pulse, an area in which no data is recorded occurs in one cycle of the encode pulse, and all data cannot be recorded in the limited recording area.

Further, as shown in FIGS. 26 (c) and 26 (d), N bits of data cannot be recorded within one cycle of the encode pulse and the area of the next encode pulse is reached. In this case, recording of the bit protruding in the next area is not reflected in the change in the time width of the encode pulse and is recorded at the old timing. That is, the protruding bit should be recorded at the timing of B / N, but is recorded at the timing of A / N.

The present invention has been made in view of the above problems, and an object of the present invention is to provide photographic information such as a date and an exposure value to the PPM even when film feeding unevenness occurs during film feeding. It is to accurately record as magnetic data in a limited area on the film by the recording method.

[0010]

In order to achieve the above object, in a magnetic recording apparatus for a camera according to a first aspect of the present invention, an encode pulse signal generating means for generating an encode pulse signal according to a film feed amount. A synchronous clock signal generating means for generating a synchronous clock signal for recording data, which is updated in response to the cycle of the encode pulse signal, and the synchronous clock signal on the film according to the synchronous clock signal and the data to be recorded. The magnetic recording unit is provided with magnetic recording means for recording data, and recording control means for permitting updating of the cycle of the synchronous clock signal when recording of the minimum unit of data is completed.

In the magnetic recording device for a camera according to the second aspect, in the magnetic recording device for a camera for recording data on a photographic film, an encode pulse signal generating means for generating an encode pulse signal according to a film feeding amount. A sync clock signal generating means for generating a sync clock signal in response to the cycle of the encode pulse signal, and a data recording means for recording data by a pulse position modulation method. It is characterized in that updating of the cycle of the synchronous clock signal is prohibited.

Further, in the magnetic recording device for a camera according to the third aspect, the synchronous clock signal generating means includes a timer means for dividing the cycle of the encode pulse signal.

[0013]

That is, in the magnetic recording apparatus for a camera according to the first aspect of the present invention, the encode pulse signal is generated by the encode pulse signal generating means according to the film feed amount, and the encode pulse signal is generated by the synchronous clock signal generating means. A synchronous clock signal for data recording is generated in response to the cycle of, and the magnetic recording means records data in the magnetic recording portion on the film according to the synchronous clock signal and the data to be recorded. When the recording of the minimum unit of data is completed by the recording control means, updating of the cycle of the synchronous clock signal is permitted.

In the magnetic recording apparatus for a camera according to the second aspect, the encode pulse signal generating means generates the encode pulse signal according to the film feed amount,
The synchronous clock signal generating means generates a synchronous clock signal in response to the cycle of the encode pulse signal, the data recording means records the data by the pulse position modulation method, and at least one bit of data is recorded in the cycle of the synchronous clock signal. Updates are prohibited.

Further, in the magnetic recording device for a camera according to the third aspect, in the above-mentioned synchronous clock signal generating means,
The timer means divides the cycle of the encode pulse signal.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a magnetic recording device for a camera of the present invention, and FIG. 2 is a partly shown in perspective view. As shown in FIG. 1, the film 11 pulled out from the film cartridge 10 is held by the pressure plate 13 at its flat surface and is wound by the film winding shaft 12. A magnetic head 6 is disposed at a predetermined position in contact with the film 11, and the input of the magnetic head 6 is connected to the output of the magnetic data recording circuit 4. A perforation detection unit 9 is arranged at a predetermined position near the film, and the output of the detection unit 9 is connected to the input of the perforation detection circuit 3.

A driven roller rotation detecting section 7 is provided at a predetermined position near the film 11, and its output is connected to the input of the driven roller rotation detecting circuit 2 and the driven roller rotation detecting circuit 2 outputs the same. The output is the CPU via the clock unit 19.
1 input. The outputs of the driven roller rotation detection circuit 2, the perforation detection circuit 3, and the clock signal generation unit 20 are connected to the input of the CPU 1, and the CPU
The output of 1 is the magnetic data recording circuit 4, the motor control circuit 5,
It is connected to the input of the clock signal generator 20. The magnetic head 6, the driven roller rotation detection unit 7, the driven roller 8, and the perforation detection unit 9 are arranged in the positions shown in detail in FIG.

In such a configuration, according to the control of the CPU 1, the driven roller rotation detecting section 7 detects the rotation of the driven roller 8 to form an encode pulse, and each time the encode pulse is generated, the CPU 1 causes the magnetic recording timing. And the magnetic recording data is continuously recorded up to the last data. Further, the CPU 1 updates the timing of magnetic recording by the magnetic head 6 each time the encode pulse is generated. However, if each bit of magnetic data is being recorded at the time when the encode pulse occurs, The timing of magnetic recording is not updated at least until the end of recording of that bit, the timing of magnetic recording is updated after the end of recording of that bit, and magnetic recording data is continuously recorded up to the last data.

The operation of the magnetic recording device for a camera having such a structure according to the first to eighth embodiments will be described below with reference to flowcharts and timing charts. First, the operation of the first embodiment will be described with reference to the timing chart of FIG. 3 and the flowcharts of FIGS. 7 to 9. When a release button (not shown) is pressed and the shooting of one frame is completed, the feeding of the film 11 is started (step S1). CPU1
While measuring the number of encode pulses generated by the driven roller rotation detection circuit 2 and the time width of one cycle according to the movement of the film 11, this loop is repeated until a predetermined number of encode pulses are detected. (Steps S2 and S3).

In step S2, as shown in detail in the flowchart of FIG. 9, the CPU 1 detects each rising edge of the encode pulse (step S40).
1) The counter for the number of encode pulses is incremented by 1 (step S402), and the counter measuring the time width is updated every time the rising edge of the encode pulse is detected (step S403).

When a predetermined number of encode pulses are detected in step S3, the CPU 1 divides the time width (assuming A as shown in FIG. 3) of the detected predetermined number of encode pulses into N equal parts A. The timer is set so that it will overflow when the time of / N has elapsed (step S4), and the timer is started (step S4).
5). Subsequently, the CPU 1 determines whether the timer has overflowed (step S6). When the timer overflows, it is determined that the time A / N has elapsed, and whether the data to be magnetically recorded is "0". It is determined whether it is 1 "(step S7).

When the data to be recorded is "0" in step S7, the CPU 1 determines whether or not the recording is the 1/3 bit (step S8). In step S8, 1
If it is the third bit (YES), the magnetic recording signal HI is sent to the magnetic data recording circuit 4, and the magnetic head 6 starts recording the first third bit of the PPM recording method on the film 11 (step S9). Next, the CPU 1 measures the number and width of the encode pulse (step S10), sets a timer according to the time width of the encode pulse (step S11), and restarts the timer (step S1).
2). If a new rising edge of the encode pulse is not detected in step S10, the CPU 1 sets the same timer as the previous time (step S11), restarts the timer (step S12), and executes the above step S
Return to 6.

On the other hand, if it is not the 1/3 bit at the step S8 (NO), the CPU 1 judges whether the recording is the 2/3 bit (step S13), the 2/3 bit.
If it is the eye (YES), the magnetic recording signal LOW is sent to the magnetic data recording circuit 4, the recording of the 2/3 bit of the PPM recording system on the film 11 is started by the magnetic head 6 (step S14), and the process proceeds to step S10. , 1/3 after that
This is the same as when recording the bit eye.

In step S13, 2 / 3bi
If it is not the t-th time (NO), the CPU 1 causes the magnetic recording signal L
The OW is sent to the magnetic data recording circuit 4, and the magnetic head 6 starts recording the third third bit of the PPM recording method on the film 11 (step S15). Then CPU1
Judges whether the recording is completed (step S16). If the recording is not completed (NO), it is set whether the data to be recorded next is "0" or "1", and the process proceeds to step S10 (step S17). . After that, it is the same as the recording at the 1/3 bit. As described above, the data "0" of the PPM recording method is recorded.

On the other hand, if the data to be recorded is "1" at the step S7, the CPU 1 judges whether or not the recording is the 1/3 bit (step S18), and if the recording is the 1/3 bit (YES). , The magnetic recording signal HI is sent to the magnetic data recording circuit 4, and the magnetic head 6 drives the film 11
The recording of the 1/3 bit of the PPM recording method is performed on the upper side, and the process proceeds to step S10 (step S19). In step S18, if it is not the 1/3 bit, (N
O) It is determined whether or not it is the 2/3 bit (step S2
0) If it is the 2/3 bit (YES), the magnetic recording signal HI is sent to the magnetic data recording circuit 4, the recording of the 2/3 bit of the PPM recording method is started on the film by the magnetic head 6, and the above step S10 is performed. Move to.

If it is not the 2/3 bit at the step S20 (NO), the CPU 1 sends the magnetic recording signal LOW to the magnetic data recording circuit 4, and the magnetic head 6 causes the magnetic head 6 to write on the film 11 at the 3/3 bit of the PPM recording system. Recording is started (step S22). Then, the CPU 1 determines whether or not the recording is completed (step S23), and if the recording is not completed (NO), sets whether the data to be recorded next is "0" or "1" and moves to step S10 (step S10). S24). Since step S10 and subsequent steps are the same as the above-described recording of "0", description thereof will be omitted here.

The above-described loop is repeated until recording is completed (YES) in steps S16 and S23, and CP
U1 changes the magnetic data recording signal as needed every time the timer overflows, and performs magnetic recording by the PPM recording method. Then, it is determined whether or not the timer overflows (step S25), and if it does not overflow (NO), the process is repeated until the timer overflows in step S25. When the timer overflows (YES), magnetic recording is terminated (step S26),
The film 11 is fed to a predetermined position (step S2
7) The feeding is stopped (step S28).

As described above, the magnetic data P is transferred at the timing corresponding to the moving amount of the film 11 during the film feeding.
It is possible to record by the PM recording method. In the above-described first embodiment, the time width of the encode pulse is N
The magnetic data recording signal is changed and recorded at the overflow timing of the equally divided timer. In other words, the magnetic data is recorded using the overflow timing of the timer as a synchronous clock for magnetic data recording. It will be.

In the above description, the data is recorded by the 1-bit PPM recording method with the synchronization clock of 3 pulses (3 cycles), but the flow chart is not limited to 3 pulses and may be 4 pulses, 5 pulses or any number of pulses. Although it may be somewhat complicated, the same effect can be obtained.

The operation of the second embodiment will be described with reference to the timing chart of FIG. 4 and the flow charts of FIGS. 10 and 11. Similar to the first embodiment, when a release button (not shown) is pressed and one frame of photographing is finished, the feeding of the film 11 is started (step S30), and thereafter, step S3.
Since steps 6 to 6 are the same as steps S1 to S7 of the first embodiment described above, description thereof will be omitted here (step S30).
~ S36).

If the data to be recorded in step S36 is "0", it is judged whether or not the first half bit is recorded (step S37), and if it is the first half bit (YES),
The magnetic data recording signal HI is sent to the magnetic data recording circuit 4, and the magnetic head 6 starts recording the HI portion of the first half bit of the PPM recording method on the film 11 (step S38). Next, the CPU 1 sets the shorter timer according to the time width of the encode pulse (step S39) and starts the timer (step S4).
0). Subsequently, as shown in FIG. 4A, the number and width of the encode pulses are measured, and the process returns to step S35 (step S41).

If it is not the first half bit in step S37 (NO), the magnetic data recording signal LOW is sent to the magnetic data recording circuit 4, and the magnetic head 6 causes the film 11 to move.
Recording of the LOW portion of the latter half bit of the PPM recording method is started (step S42), and the longer timer corresponding to the time width of the encode pulse is started (steps S43 and S44). Then, it is judged whether or not the recording is completed (step S45), and if the recording is not completed (NO),
The data to be recorded next is set to "0" or "1", and the process proceeds to step S41 (step S46). In this way, as shown in FIG. 4C, "0" of the PPM recording method in which the HI of the first half bit is short and the LOW of the second half bit is long is recorded.

On the other hand, when it is judged as "1" in the above step S36, it is judged whether or not the first half bit is recorded (step S47), and if it is the first half bit (YES), the magnetic data recording signal HI is set to the magnetic data. Sent to the recording circuit 4,
Recording of the first half HI portion of the PPM recording method is started on the film by the magnetic head 6 (step S48), a longer timer is set according to the encode pulse width (step S49), and the timer is started (step S48). S5
0).

If the bit is not the first half bit in step S47 (NO), the magnetic data recording signal is set to LOW (step S51), the shorter timer corresponding to the encode pulse is set (step S52), and the timer is started. (Step S53), it is judged whether or not the recording is completed (Step S54), and if the recording is not completed (NO),
Next, whether the data to be recorded is "0" or "1" is set, and the process proceeds to step S41 (step S55). In this way, the HI of the first half bit is long and the HI of the second half bit is LOW.
However, a short "1" is recorded. Repeating the above, PPM
When recording methods "0" and "1" are recorded and it is determined that the recording is completed in step S46 and step S54, step S
Move to 56. Since the subsequent steps are similar to those of the first embodiment, the description thereof is omitted here.

In the above-described first embodiment, clocks having equal intervals according to the width of the encode pulse are created and magnetic data is recorded by the PPM recording method.
In the second embodiment, two clocks, a short clock and a long clock, are created according to the width of the encode pulse, and the PPM is set.
By recording magnetic data by the recording method, S /
Magnetic data can be recorded with an arbitrary N ratio.

The operation of the third embodiment will be described with reference to the timing chart of FIG. 5 and the flow charts of FIGS. 12 and 13. Generally, if the sync clock for magnetic data recording is changed immediately after the encode pulse is detected, for example, if the encode pulse is detected during data recording of a certain bit, the cycle of the sync clock changes from the middle. As a result, the S / N ratio collapses and accurate recording cannot be performed.

In the third embodiment, as shown in FIGS. 5A to 5C, even if the encode pulse B is detected,
The synchronous clock for magnetic data recording is not changed until the recording of 1 bit is completed, and the synchronous clock is changed at the end of recording of 1 bit, that is, the 3/3 bit. The ratio of N is maintained.

That is, 1 in 1 bit of each data
/ 3 bit, 2/3 bit, and 3/3 bit are recorded by using the same synchronous clock, and even if an encode pulse is detected in the middle, the clock is not changed until the 3/3 bit is recorded, and the next 1 bit starts. The clock is changed from (steps S70, S71, S
72) and other steps are the same as those in the first embodiment, and the description thereof will be omitted.

The operation of the fourth embodiment will be described with reference to the timing chart of FIG. 6 and the flow charts of FIGS. 14 and 15. In the fourth embodiment, as soon as the encode pulse is detected, the synchronous clock for magnetic data recording is changed,
The problem is that the S / N ratio of the magnetic data recording signal is lost.

That is, setting of the synchronous clock (long timer,
The short timer) is performed during bit recording of the first half of the data, and even if an encode pulse is detected in the middle of recording, the synchronization clock is changed after waiting for the end of the recording of the second half of the data to be recorded. The first half and the second half of the recording are performed with a long or short synchronization clock created from the same encode pulse, and the S / N of the magnetic data recording signal is recorded.
The ratio of is not destroyed (step S1
01, S111, S112). Since the other parts are the same as those in the second embodiment described above, the description thereof is omitted here.

The operation of the fifth embodiment will be described with reference to the timing chart of FIG. 3 and the flowcharts of FIGS. 16 and 17. First, when a release (not shown) is pressed and the photographing of one frame is completed, the feeding of the film 11 is started (step S120). Next, while measuring the number of encode pulses generated according to the movement of the film 11 and the time width of one cycle, steps S121 to S122 are repeated until the predetermined number of encode pulses are detected (step S121, S122).

At this time, in step S121, the encoder pulse count counter is incremented by 1 each time the encode pulse rise is detected, and the time width measurement counter is updated each time the encode pulse rise is detected. To go. When the predetermined number of encode pulses are detected in step S122, the timer interrupt is permitted (step S123), the timer corresponding to the encode pulse width is set (step S124), and the timer is started (step S125).

Subsequently, the CPU 1 judges whether or not the recording is completed (step S126), and if the recording is not completed (N)
O), measure the number and width of the encode pulse, and step S
It returns to 126 (step S127). The CPU 1 proceeds to step S126 until YES in step S126.
~ Repeat S127. YES in step S126
Then, the CPU 1 inhibits the timer interruption (step S128), feeds the film 11 to a predetermined position (step S129), and stops the feeding of the film 11 (step S130). Interrupt enabled (step S1
Between 23 and step S129), an interrupt is generated each time the timer set according to the encode pulse width overflows, and when the interrupt occurs, the interrupt processing shown in FIG. 17 is performed.

That is, it is judged whether the data to be recorded is "0" or "1" (step S131), and if "0", then 1 / 3b.
It is determined whether or not it is the it-th record (step S132),
If it is the 1/3 bit (YES), the magnetic data recording signal HI is sent to the magnetic data recording circuit 4, and the recording of the 1/3 bit of the PPM recording method on the film 11 is started by the magnetic head 6 (step S133). Then, CPU
1 sets a timer according to the time width of the encode pulse (step S134), restarts the timer, and returns to the interrupt source (step S135). Steps S126 to S127 are repeated until the next interrupt occurs, and when the next interrupt occurs, the interrupt process shown in FIG. 17 is performed again, and the process is appropriately returned to the interrupt source.

In this way, step S12 of FIG.
In step S127, it is determined whether or not recording has ended, and in step S127, when the timer overflows and an interrupt occurs while measuring the number and width of the encode pulses, the interrupt process of FIG. 17 is performed, and steps S126 to S126 of FIG. Returning to S127, step S12
Repeat until it is judged as YES in 6.

The contents of the interrupt processing shown in FIG. 17 include steps S7 to S7 of the flow chart shown in FIG.
S9, steps S11 to S15, steps S17 to S2
2. Since it is the same as step S24, detailed description is omitted here.

As described above, the same effect as the first embodiment can be obtained, but in the above-described first embodiment, the overflow of the timer is detected during the loop processing of steps S6 to S12 of FIG. Therefore, after the timer actually overflows until the timer overflow is detected in step S6,
The processing time of the loop of 6 to step S12 may be added as an error, which may cause a variation in the S / N ratio of the magnetic data recording signal. In the fifth embodiment, it is possible to eliminate an error in processing time due to the loop processing by using the interrupt function.

Next, the operation of the sixth embodiment will be described with reference to the flow charts of FIGS. Steps S150 to S160 of FIG. 18 are the same as steps S120 to S130 of FIG. 16 of the fifth embodiment, and steps S161 to S166 of FIG. 19 are steps S66 to S66 of FIG. 12 of the third embodiment. This is the same as step S68, step S70 to step S75, step S77 to step S82, and step S84, and detailed description thereof is omitted here.

That is, the fifth embodiment is the same as the first embodiment by the C
The sixth embodiment is an embodiment improved by using the interrupt function of the CPU as in the embodiment improved by using the interrupt function of the PU so as to eliminate the error due to the loop processing. In this embodiment, the magnetic data can be recorded more accurately by the PPM recording method.

Next, the operation of the seventh embodiment will be described with reference to the flowchart of FIG. From step S180 of FIG.
S196 is the step S of FIG. 10 in the second embodiment.
36 to S40, steps S42 to S44, step S4
6 to S53 and S55, the detailed description is omitted here. The seventh embodiment is the same as the second embodiment described above.
This is an example improved by using the PU interrupt function, and the same effect as that of the fifth embodiment can be obtained.

Next, the operation of the eighth embodiment will be described with reference to the flowchart of FIG. This embodiment is based on the above fifth and fifth embodiments.
It is an example in which the interrupt processing in the sixth embodiment is modified.
In the same way that the seventh embodiment is an example in which the second embodiment is improved by using the CPU interrupt processing, the eighth embodiment is an embodiment in which the fourth embodiment is improved by using the CPU interrupt function. Therefore, the same effect as that of the sixth embodiment can be obtained.
Although the clock signal is generated inside the CPU 1 in the first to seventh embodiments, it goes without saying that the clock signal may be generated by an external circuit.

According to the above embodiment of the present invention, the following constitution can be obtained. (1) Encoding pulse signal generating means for generating an encoding pulse signal each time the film is fed for a certain length,
And a clock signal generating means for generating a clock signal having a cycle shorter than the cycle of the encode pulse signal according to a result of the time measuring means. A magnetic recording device for a camera, characterized in that the cycle of the clock signal is updated every time a pulse signal is generated, and data is recorded on the film in synchronization with the clock signal. (2) Encode pulse signal generating means for generating an encode pulse signal each time the film is fed for a certain length,
Time measuring means for measuring the cycle of the encode pulse signal; first clock signal generating means for generating a clock signal of a first cycle shorter than the cycle of the encode pulse signal according to the output of the time measuring means; A second clock signal generating means for generating a clock signal having a second cycle shorter than the cycle of the encode pulse signal, the second clock signal generating means being different from the first cycle; The period of the first and second clock signals is updated, either the first clock signal or the second clock signal is selected according to the data to be recorded, and the data is recorded on the film in synchronization with this clock signal. A magnetic recording device for a camera, which records the data. (3) In a magnetic recording device of a camera for recording data on a film by a pulse position modulation method, an encode pulse signal generating means for generating an encode pulse signal every time the film is fed for a fixed length, and the encode pulse signal generating means. And a clock signal generating means for generating a clock signal having a cycle shorter than the cycle of the encode pulse signal according to the result of the time measuring means, and a clock signal generating means for synchronizing with the clock signal. When recording data on a film, even if the encode pulse signal is generated, the cycle of the clock signal is not updated during recording of each bit of data, and at least until the end of recording of the bit being recorded. A magnetic recording device for a camera, characterized in that the cycle of the clock signal is updated after waiting. (4) Data to be recorded having two clock signal generating means of a first cycle shorter than the cycle of the encode pulse signal as the clock signal and a second cycle different from the first cycle. The magnetic recording device for a camera according to (3) above, wherein data is recorded on the film by switching between the first clock signal and the second clock signal in accordance with the above.

[0053]

As described above, according to the present invention, even when the film is unevenly fed during the feeding of the film, the PPM recording method allows the magnetic field to be accurately recorded in a limited area on the film. A magnetic recording device for a camera capable of recording data can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a magnetic recording device of a camera of the present invention.

FIG. 2 is a perspective view showing in detail a part of the magnetic recording device of the camera of the present invention.

FIG. 3 is a timing chart for explaining data recording according to the first embodiment.

FIG. 4 is a timing chart for explaining data recording according to the second embodiment.

FIG. 5 is a timing chart for explaining data recording according to the third embodiment.

FIG. 6 is a timing chart for explaining data recording according to the fourth embodiment.

FIG. 7 is a flowchart for explaining data recording according to the first embodiment.

FIG. 8 is a flowchart for explaining data recording according to the first embodiment.

FIG. 9 is a flowchart for explaining data recording according to the first embodiment.

FIG. 10 is a flowchart for explaining data recording according to the second embodiment.

FIG. 11 is a flowchart for explaining data recording according to the second embodiment.

FIG. 12 is a flow chart for explaining data recording according to the third embodiment.

FIG. 13 is a flowchart for explaining data recording according to the third embodiment.

FIG. 14 is a flowchart for explaining data recording according to the fourth embodiment.

FIG. 15 is a flow chart for explaining data recording according to the fourth embodiment.

FIG. 16 is a flowchart for explaining data recording according to the fifth embodiment.

FIG. 17 is a flowchart for explaining data recording according to the fifth embodiment.

FIG. 18 is a flow chart for explaining data recording according to the sixth embodiment.

FIG. 19 is a flow chart for explaining data recording according to the sixth embodiment.

FIG. 20 is a flow chart for explaining data recording according to the seventh embodiment.

FIG. 21 is a flow chart for explaining data recording according to the eighth embodiment.

FIG. 22 is a diagram for explaining a PPM recording method according to a conventional technique.

FIG. 23 is a flowchart showing a data recording operation according to a conventional technique.

FIG. 24 is a timing chart for explaining problems of the conventional technique.

FIG. 25 is a timing chart for explaining problems of the conventional technique.

FIG. 26 is a timing chart for explaining problems of the conventional technique.

[Explanation of symbols]

1 ... CPU, 2 ... Driven roller rotation detection circuit, 3 ... Perforation detection circuit, 4 ... Magnetic data recording circuit, 5 ...
Motor control circuit, 6 ... Magnetic head, 7 ... Followed roller rotation detecting section, 8 ... Followed roller, 9 ... Perforation detecting section, 10 ... Film cartridge, 11 ... Film, 1
2 ... Film winding shaft, 13 ... Pressure plate, 14 ... Feed motor,
Reference numeral 15 ... R fork, 16 ... Photographing lens, 17 ... Gear unit, 18 ... Spool shaft, 19 ... Timekeeping section, 20 ... Clock signal generating section.

Claims (3)

[Claims] 1. An encode pulse signal generating means for generating an encode pulse signal according to a film feed amount, and updated in response to a cycle of the encode pulse signal,
Synchronous clock signal generating means for generating a synchronous clock signal for data recording, and according to the synchronous clock signal and the data to be recorded,
Magnetic recording means for recording data on the magnetic recording portion on the film; and recording control means for permitting updating of the cycle of the synchronous clock signal when recording of the minimum unit of data is completed. Magnetic recording device for camera. 2. A magnetic recording device of a camera for recording data on a photographic film, comprising: encode pulse signal generating means for generating an encode pulse signal according to a film feed amount; and synchronization in response to a cycle of the encode pulse signal. A synchronous clock signal generating means for generating a clock signal and a data recording means for recording data by a pulse position modulation method are provided, and it is prohibited to update the cycle of the synchronous clock signal during recording of at least 1-bit data. Characteristic camera magnetic recording device. 3. The magnetic recording apparatus for a camera according to claim 1, wherein the synchronous clock signal generating means includes a timer means for dividing a cycle of the encode pulse signal.