JPH1010636A - Camera capable of magnetically recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record data with a desired recording density, even if the resolution of a detecting means for detecting a film speed is changed by correcting the space values of pulse signals generated whenever a film is moved by a specific amount. SOLUTION: Whenever the film 9 is moved for the specific amount, a pulse generating part 1 generates the pulse signals and outputs them to a microcomputer 10. A pulse width measuring part 2 measures the spaces of the pulse signals. A correcting part 3 corrects the time interval data of the measured pulse signals by using the correction data of an EEPROM 8. Time data required for recording the data with a reference recording density and a bit location is read from the table of a data table part 4, based on the corrected data and set in a timing generating part 5. A magnetic head driving part 6 causes a current to flow in a magnetic head 7, in synchronization with the output of the timing generating part 5. Thus, the data is recorded on the magnetic recording layer of the film 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetically recordable camera for recording information such as date data, printing conditions and photographing conditions on a magnetic recording layer on a film by a pulse position modulation method.

[0002]

2. Description of the Related Art Conventionally, various techniques for magnetically recording information such as photographing conditions on a magnetic recording layer of a film have been proposed. As one example, pulse position modulation (PPM; P
ulse Position Modulation) method.

Hereinafter, magnetic recording by the PPM method will be described with reference to FIG. In this figure, it is assumed that the film moves at a constant speed from right to left with reference to the contact position of the magnetic head, and at this time, a current having a waveform as shown in FIG. When the position at which the current is changed from (+) to (-) is indicated by C, and the position at which the current is changed from (-) to (+) is indicated by D, one bit of data is recorded in the region from C to C. Area for The center of this area is set to the position of 50 [%], and if D exists on the left side with respect to the position of 50 [%], it indicates bit "0", and D
Indicates bit “1” if exists. A bit location (abbreviated as BLx) is defined by the following equation as a parameter indicating the position of D.

BLx = Tx / Tbit × 100 [%] Tbit is the time from C to C, and Tx is the time from C to D
Until the time. It should be noted that the bit location can be defined by expressing Tx and Tbit by the length on the film.

FIG. 18 is a diagram showing a change in film speed when the film is wound by one frame. The curve of the speed change shown in FIG. 7 greatly changes due to the fluctuation of the battery voltage which is a power supply applied to the motor and the fluctuation of the load applied to the motor (the amount of film withdrawal which changes mainly due to temperature change). Therefore, if magnetic recording is performed with Tbit and TX shown in FIG. 17 being fixed values, the recording density also changes greatly, making it difficult to use the magnetic recording.

In the technique disclosed in Japanese Patent Application Laid-Open No. 5-165090, for example, a detecting means for detecting a film speed is provided, and a timing signal necessary for data recording is provided based on a pulse signal generated by the detecting means. Has occurred. Since the recording operation is performed in synchronization with the timing signal, data is recorded at a constant speed.

The detecting means comprises a roller member which rotates following the movement of the film, a disk having a slit fixed to the roller member, and a photo interrupter which detects the slit of the disk. The resolution of the detection means (the number of pulses generated by the photo interrupter when the film moves by the unit length) and the required data recording density (data bi to be recorded per unit length of the film)
Once the (t number) is determined, a timing signal can be created.

For example, if the resolution of the detection means is 2 [pulses /
mm] and the recording density is assumed to be 10 [bit / mm]. In this case, the timing signal may be generated by dividing the time interval of the pulse signal of the detection means into five. Then, if the recording operation is performed in synchronization with this timing signal,
A desired recording density is obtained.

[0009]

However, the resolution of the detection means is determined by the diameter of the roller member rotating in contact with the film and the number of slits in the disk. Therefore, if the resolution changes for some reason, for example, a deviation in dimension of the roller member due to manufacturing, a change in dimension due to temperature, or the like, the recording density will deviate from a desired value.

The present invention has been made in view of the above problems, and has as its object to provide a magnetically recordable camera capable of recording data at a desired value even when the resolution of the detection means changes. To provide.

[0011]

In order to achieve the above object, a first aspect of the present invention is to use a film having a magnetic data recording track, and provide a camera capable of magnetic recording on the film. Pulse signal generating means for generating a pulse signal every time the film moves by a predetermined amount in conjunction with the movement, correcting means for correcting the interval value of the pulse signal by the pulse signal generating means, and correction output by the correcting means Timing signal generating means for generating a timing signal based on the value, and in synchronization with the timing signal,
Recording control means for controlling magnetic recording.

According to a second aspect, in a camera using a film having a magnetic data recording track and capable of magnetic recording on the film, a pulse signal generating means for generating a pulse signal with the movement of the film; Measuring means for measuring a signal interval, and correcting means for correcting an output value of the measuring means based on data of the storage means,
A timing signal generating means for generating a timing signal based on a correction output value of the correcting means, and a magnetic control means for controlling magnetic recording in synchronization with the timing signal.

According to a third aspect, in a camera using a film having a magnetic data recording track and capable of magnetic recording on the film, a magnetic head for performing magnetic recording on the track, Pulse signal generating means for generating a pulse signal with a predetermined amount of movement of the film, and measuring means for measuring the interval of the pulse signal,
First storage means for storing a data table summarizing first data referred to in accordance with the pulse signal interval, and arbitrarily writing and storing second data for correcting a measurement value of the measurement means A second storage unit that corrects the measurement value of the measurement unit based on the second data to obtain a corrected measurement value, and a correction measurement value obtained by the correction unit and the first storage unit. Recording control means for controlling a recording current flowing through the magnetic head.

That is, in the first aspect of the present invention, the pulse signal is generated by the pulse generation means every time the film moves by a predetermined amount in conjunction with the movement of the film, and the pulse signal is generated by the pulse signal generation means by the correction means. The timing signal is corrected to a signal interval value, and a timing signal is generated by the timing signal generation means based on the correction output value by the correction means,
Magnetic recording is controlled by the recording control means in synchronization with the timing signal.

In the second aspect, a pulse signal is generated by the pulse signal generation means along with the movement of the film, the interval between the pulse signals is measured by the measurement means, and the correction means based on the data in the storage means. The output value of the measuring means is corrected, a timing signal is generated by the timing signal generating means based on the corrected output value by the correcting means, and the magnetic recording is controlled by the magnetic control means in synchronization with the timing signal.

In the third aspect, magnetic recording is performed on the track by a magnetic head, and when the film is fed by the pulse signal generating means, a pulse signal is generated with a predetermined amount of movement of the film, and the measuring means , The interval between the pulse signals is measured, the first storage unit stores a data table summarizing the first data referred to in accordance with the interval between the pulse signals, and the second storage unit stores the data table. Second data for correcting the measurement value is arbitrarily written and stored, and the correction unit corrects the measurement value of the measurement unit based on the second data, and the recording control unit corrects the measurement value of the correction unit by the recording control unit. The first
The recording current flowing through the magnetic head is controlled based on the storage means.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a magnetically recordable camera according to the first embodiment. As shown in FIG. 1, a pulse generator 1 is provided at a position facing the film 9, and an output of the pulse generator 1 is a pulse width measuring unit (including a first timer counter) 2.
Connected to the input. And the pulse width measuring unit 2
The output of the EEPROM 8 is connected to the input of the correction unit 3, and the output of the correction unit 3 is connected to the input of the data table unit 4. The output of the data table 4 is connected to the input of a timing generator 5 (including a second timer counter), and the output of the timing generator 5 is connected to a magnetic head 7 via a magnetic head driver 6. ing.
The pulse width measurement unit 2, the correction unit 3, the data table unit 4, and the timing generation unit 5 are all included in the microcomputer 10.

In such a configuration, each time the film 9 moves by a fixed amount, the pulse generator 1 generates a pulse signal and outputs it to the microcomputer 10. The pulse width measuring unit 2 including the first timer counter measures the interval between the pulse signals. The correction unit 3 corrects the time interval data of the measured pulse signal using the correction data of the EEPROM 8. Based on the corrected data, time data necessary for recording data at a reference recording density and a bit location is read from the table of the data table unit 4. This data is set in the timing generator 5 including the second timer counter. The magnetic head drive unit 6 supplies a current to the magnetic head 7 in synchronization with the output of the timing generation unit 5. Thereby, data is recorded on the magnetic recording layer of the film 9.

Next, FIG. 2 shows a detailed configuration of the magnetically recordable camera according to the first embodiment and will be described. In FIG. 1, a microcomputer (hereinafter abbreviated as a microcomputer) 11 controls the entire camera. The microcomputer 11 includes a photometry circuit 12, a distance measurement circuit 13, a shutter control mechanism 14, and a focus adjustment mechanism 1 having a known configuration.
5. A display circuit 16 for displaying various information such as photographing information, date, and operation mode of the camera, and a storage circuit 17, which is composed of an EEPROM and stores film frame numbers, camera adjustment data, and the like, are connected.

The microcomputer 11 has a release switch (REL SW) 18 for starting an exposure operation,
A rewind switch (REW SW) 19 which is operated when rewinding the film after the shooting to the patrone;
A patrone detection switch (PT SW) 20 that is turned “ON” when a patrone is loaded in the camera, and a power switch (PW SW) 21 linked to the power supply of the camera are provided.

The magnetic head 24 records data on a magnetic layer on the film 23. The current flowing to the magnetic head 24 is controlled by the output port P-MG (+) or P-MG (-) of the microcomputer 11. For example, in order to allow a current to flow in the direction ((+) direction) shown in FIG.
(+) May be set from Lo to Hi. Then, the transistor Q1 is turned on by the current flowing through the limiting resistor Rb, and the current flows in the direction shown in the figure. Then, the magnetic material on the film is magnetized in a predetermined direction. The resistance Rg is provided to limit the current flowing through the magnetic head 24. In order to allow a current to flow in a direction opposite to the illustrated direction, P-MG (-) may be set from Lo to Hi.

A perforation for detecting the position of the film is provided on the film 23. The perforation is a photoreflector (hereinafter referred to as PR).
33). A photo interrupter (hereinafter, referred to as PI) 32 measures a moving amount and a moving speed of the film. The slit disc 31 rotates in conjunction with the movement of the film, and changes the output signal of the PI 32.

The output signals of PR33 and PI32 are converted into signals that can be input to microcomputer 11 by signal processing circuit 25, the signal of PR33 is output to input port P-PR, and the signal of PI32 is input to input port P-PI. Is output. The control of film winding and rewinding is performed by the drive circuit 2
7 is carried out by a motor connected to the film feeding mechanism 26 via the motor 7. The film feeding mechanism will be described later.

The clock circuit 28 creates data of "year", "month", "day", "hour", and "minute" to be magnetically recorded on the film. The communication circuit 29 is used when the camera and the external control device 30 communicate. The external control device 30 is, specifically, a personal computer used in a camera production line or the like. The adjustment data of the storage circuit 17 can be changed by this personal computer. The temperature measurement circuit 31 is for measuring the temperature of the camera. Data relating to the temperature of the camera is used in the detection of the subject distance and the magnetic recording operation.

Next, FIG. 3 is a perspective view showing the film feed mechanism 26 of the camera as seen through from the rear, and will be described.
This state of the film feeding mechanism is shown immediately after the film cartridge is loaded in the camera body.

A pinion gear 42 is provided on an output shaft of a film winding / rewinding motor (M1) 41 provided in the camera body.
It is in mesh with the sun gear 43. Furthermore, this sun gear 4
3 is in mesh with the planetary gear 44,
Are supported so as to revolve around the rotation axis of the sun gear 43 via the gear arm 45. In a film winding chamber provided on the right side as viewed from the rear of the camera body, a winding spool 46 for winding a film is rotatably provided. A spool gear 47 that meshes with the planetary gear 44 when the planetary gear 44 revolves counterclockwise is provided integrally. The film holding plate 40 is for pressing the film against the take-up spool 46 by the tension of the spring 39.

When the planetary gear 44 revolves clockwise, the idle gear 49 is moved to a position where it meshes with the planetary gear 44.
The idle gear 49 is provided with a gear 5
Via 0, 51, 52, it is connected to a coupler gear 53 described later. On the left side from the rear of the camera body, there is a patrone storage room for storing the patrone 54. Above the storage chamber, a coupler gear 5 having a coupler 55 whose tip projects in a “-” shape
3 is provided rotatably. This coupler 55
As shown in FIG. 4, the cartridge is engaged with a groove provided on the upper end surface of a feed spool 57 provided on the patrone 56 and integrated with the feed spool 57 around the axis.

The camera main body is provided with a film feed motor (M2) 58. A pinion gear 59 is provided on an output shaft of the film delivery motor 58, and the pinion gear 59 is meshed with a sun gear 60. Further, the sun gear 60 meshes with a planetary gear 61, and the planetary gear 61 is supported via a gear arm 62 so as to revolve around the rotation axis of the sun gear 60. Since the tension of the spring 63 acts on the gear arm 62, the planetary gear 61 and the idle gear 52 mesh only when the film feed motor 58 (M2) rotates counterclockwise. The film 66 is exposed with light from the opening 64 of the camera body.

On the other hand, the PR 33 is for detecting perforations in the film 66. As shown in FIG. 4, perforations 66a are provided on the right and left sides of the exposure area 66b of each frame of the film. The magnetic head 24 is arranged near the opening 64. The pad 38 is arranged so as to face the magnetic head 24 and sandwich the film 66 therebetween. This pad 38 is a leaf spring 37
And is pressed against the film 66 by the tension of the spring.

The outer periphery of the roller member 72 is formed of rubber or the like, and rotates in conjunction with the movement of the film 66. The disk with slits 31 is integrated with the rotation shaft of the roller member 72. When the roller member 72 rotates, the slit disk 75 rotates. Each time the slit crosses the PI 32, the PI 32 outputs a signal serving as a reference for the timing of the recording operation.

Next, the operation of the main routine of the magnetically recordable camera according to the first embodiment will be described with reference to FIG. In the following description, the reference numerals of the components shown in FIGS.

When the power switch 21 is turned "ON" by the operator, the microcomputer 11 is power-on reset. Then, the microcomputer 11 initializes the I / O port,
The memory is initialized (step S1). Subsequently, the microcomputer 11 determines whether there is a communication request from the external control device 30 (Step S2).

If there is a communication request, step S
Move to 3. Then, the address and data of the storage circuit 17 are input from the external control device 30 (steps S3 and S3).
4), update the data in the storage circuit 17 (Step S)
5). When the data update is completed, the process returns to step S2. By the processing of steps S1 to S5, the storage circuit 1
7 can be arbitrarily changed.
Note that this data also includes parameters for setting conditions for magnetic recording.

On the other hand, if there is no communication request in step S2, the microcomputer 11 determines the state of the cartridge detection switch (PT SW) 20 (step S2).
6). Then, the PT SW 20 changes from “off” to “on”
When it changes to, the film is taken out from the patrone and wound around the take-up spool. Then, the microcomputer 11 moves the exposure area of the first frame to the opening 64 of the camera body,
It returns to step S6 (step S7).

In step S6, when there is no change in the state of the PT SW 20, the microcomputer 11 sets the REW SW
The state of No. 19 is determined (step S8). And RE
When the WSW 19 changes from “off” to “on”, an operation of rewinding the film 23 to the cartridge is performed, and the process returns to step S6 (step S9).

In step S8, the REW SW19
When there is no change, the microcomputer 11 determines the state of the power switch (PW SW) 21 (step S1).
0). When the PW SW 21 is “OFF”, the operation of the microcomputer 11 is stopped.
The processing shifts to the processing after step 1.

In the processing after step S11, first, the shutter speed Tv and the aperture value Av are calculated based on the luminance data and the film sensitivity data input from the photometry circuit 12 (step S11), and the calculation results are output to the display circuit 16. (Step S12), the release switch (REL)
SW) 18 is determined (step S13). If it is determined that the REL SW 18 is “OFF” (NO),
It returns to step S6.

On the other hand, if the REL SW 18 is "ON" (YES), camera temperature data is input from the temperature measurement circuit 31 (step S14). And the distance measuring circuit 13
Then, the subject distance is calculated based on the data output from (step S15). Then, the focus control mechanism 15 is controlled based on the distance data (step S16), and the shutter control mechanism 14 is controlled based on the already calculated Tv value and Av value.
To expose the film 23 (step S1).
7). When the exposure operation is completed, data to be recorded on the magnetic layer of the film 23 is created (step S1).
8).

FIG. 6 is a diagram showing an example of data created in step S18. These data are recorded in the RAM of the microcomputer 11, and data converted by a predetermined code (for example, an IS0 code) table is used. The data at the addresses #ADst to #ADend are decomposed into bit data, and are magnetically recorded in conjunction with the film winding operation.

Subsequently, a subroutine "winding up" is executed (step S19). In this subroutine, the film is wound up by one frame, and the data created in step S18 is magnetically recorded. Thereafter, the process returns to step S6, and the sequence is repeated.

Next, the operation of the subroutine "winding up" will be described with reference to the flowcharts of FIGS. 7 and 8, and the time chart of FIG. In this subroutine, the exposed film is wound up by one frame. Further, during execution of this subroutine, the magnetic recording operation is executed utilizing the interrupt function of the microcomputer 11.

When the operation of this subroutine "winding up" is started, the microcomputer 11 stores in the storage circuit 17 (EEPROM)
From the correction data (Ct, Cf, Cr,
Pst) is read (step S20). FIG. 11 shows an example of the correction data stored in the storage circuit 17. Details of each parameter will be described later.

Subsequently, the microcomputer 11 sets the register PIC
Clear NT and PRCNT. This PICNT is PI
32 is a register for counting the pulse signal output, and PRCNT is a register for counting the signal change of PR33 (step S21).

Next, the microcomputer 11 sets the applied voltage (Vm1) to the motor (step S22), and sets the motor (M
1) 41 is turned ON (step S23). This behavior is
This is performed at the timing of * 1 on the time chart of FIG. 12, whereby the film 6 starts to move. Immediately after the motor (M1) 41 is turned on, the magnetic head 24 (+)
A current is supplied in the direction (step S24).

Subsequently, the microcomputer 11 starts counting of the first timer counter (T1). The first timer counter is used to measure the interval of the pulse signal of the PI 32 (Step S25). T1 on the time chart in FIG. 12 is a pulse signal interval.

Next, the microcomputer 11 sets the input port P-
It is determined whether a PI pulse has been input based on the state of the PI (step S26). Here, when the pulse signal is input, the process proceeds from step S26 to S27. Then, the data of the first timer counter is recorded in the register TFV (step S27), and the value of the first timer counter is cleared to measure the interval of the next pulse signal (step S28).

The processing in steps S281 to S284
It is to check whether the FV is between the upper limit (#Tmax) and the lower limit (#Tmin). That is, step S281
If it is determined that the TFV is larger than #Tmax in step (S), the flow shifts to step S282. Then, the microcomputer 11 sets #Tmax in TFV. If the contact between the roller member 72 and the film is poor and the roller member does not rotate smoothly, the pulse width of the PI becomes very wide. At this time, if magnetic recording is performed based on the data recorded on the TFV, the recording density will be much lower than the desired value.

Even if such a situation occurs, in order to secure the minimum necessary recording density, steps S281 and S28 are executed.
2 is required. In step S283, it is determined whether TFV is smaller than #Tmin. And TFV is #Tmi
If it is smaller than n, the flow shifts to S284, and #Tmin is set to TFV.

This #Tmin is determined by the processing capability of the microcomputer 11 for controlling the camera. An interrupt operation is generated based on the value of TFV. Timer counter 2
The value to be set to (T2) is determined. As the value of TFV decreases, the number of operations of the interrupt processing routine (FIG. 13) increases. When the TFV becomes smaller than a certain value, the microcomputer exclusively uses the operation of the interrupt processing routine and cannot perform the processing of the "winding up" routine. Then, the control of the camera fails. In order to prevent such a situation from occurring, steps S283 and S284 are required.

Subsequently, in step S285, the microcomputer 11 multiplies the TFV by the correction data Ct stored in the storage circuit 17 (EEPROM). And this step S
Based on the TFV corrected at 285, the microcomputer 11
The bitf and Tbitr are read from a data table existing in the program memory (step S29).

FIG. 9 shows an example of the data table. Here, it is assumed that the PI 32 generates two pulses each time the film moves by 1 [mm]. The desired recording density is assumed to be 10 [bit / mm]. An example is shown as a condition for generating a pulse signal from the PI 32 with this assumed resolution. For example, assuming that the diameter φ of the roller member 72 is 3.2 [mm] and the disk 31 provided with 20 slits is used, the assumed resolution can be obtained.

Further, a method of creating data to be stored in the table will be described with reference to the time chart of FIG.
Since the pulse of PI32 is emitted every time the film moves 0.5 [mm], the recording density (WD) of the data is 10
(Bits / mm) means that data of 5 bits should be recorded during generation of one pulse. Therefore, the recording time (Tbit) of 1-bit data is T
It becomes 1/5.

Further, when the bit location (BL1) of bit “1” is set to 75 [%], Tbitf is 0.75 · Tbit and Tbitr is (1−0.7
5) It becomes Tbit. When the current of the magnetic head 24 is controlled at time intervals of Tbitf and Tbitr, bit “1” is recorded on the film.

The value of T1 changes according to the speed of the film. Therefore, the table of FIG. 10 is obtained by assuming the maximum value and the minimum value of the film speed in advance and calculating Tbitf and Tbitr for T1 in this range. The table corresponds to a film speed of 100 to 50 [mm / scc].

Here, the bit location (BL0) of bit "0" is set to 25 [%]. The reason for setting to 25 [%] is that the bit locations of bit "1" and bit "0" are symmetric with respect to 50 [%]. Therefore, when the current of the magnetic head 24 is controlled at the time interval of Tbitr and Tbitf, the bit
“0” can be recorded. It is not necessary to provide data tables for bit “1” and bit “0” separately.

Returning to the description of FIG. The correction data Ct used in step S285 is 0.9 from FIG.
It is. This is because the diameter of the roller member was assumed earlier3.
This is a value to be set when it is 3.6 [mm], which is 10 [%] larger than 2 [mm]. Step S285
Is not executed, the value of TFV becomes 10% larger than the original value. If Tbitr and Tbitf are referenced from the table of FIG. 9 based on this TFV, the referenced Tbitr and Tbitf will also be 10% larger. This means that instead of the assumed recording density of 10 [bits / mm],
9 [bits / mm] indicates that magnetic recording is performed.

The value of Ct shown in FIG. 11A is only an example. Even if the diameter of the roller member deviates from the assumed dimension, a desired recording density can be achieved by determining Ct so as to offset this deviation amount.

FIG. 11B shows the correction data Ct in consideration of the influence of temperature. It is beneficial when the diameter of the roller member 72 changes with temperature. Further, even if the dimension (length direction) of the film changes due to the temperature, it can be corrected so as not to be affected by the change. What is necessary is just to select predetermined correction data based on the temperature information input from the temperature measurement circuit 31.

In step S30, Tbitr and Tbitf previously read from the data table in step S29 are used.
Correction. Tbitr is multiplied by the correction value Cr and the register T
Store to BR. Here, as shown in the time chart of FIG. 12, the time for reversing the current direction of the magnetic head 24 is determined based on the data of TBF and TBR. Specifically, the time counter 2 (T
In 2), TBF and TBR data are set. The magnetic recording conditions (WD = 10 [b
its / mm], BL1 = 75 [%], BL0 = 25
[%]) Can be changed. BL1 and B showing examples below
When it is desired to change WD to 20 [bits / mm] without changing L0, it is sufficient to set Cf = Cr = 0.5.

When TBF and TBR are calculated based on Cf and Cr shown in FIG. 11, BL1 is 60% and BL0 is
Can be set to 40 [%]. In this case, W
D does not change, only the bit location changes.

Subsequently, the microcomputer 11 increments (+1) a register PICNT for counting the number of PI pulses (step S31), and determines whether PICNT is equal to a predetermined number PST (step S32). This P
ST indicates the magnetic recording start position on the film (FIG. 1).
(It corresponds to the timing of * 2 on the time chart of 2.) P
ST is read from the EEPROM in step S20.

If the Pst shown in FIG. 11A is used, magnetic recording starts when the PI 32 outputs seven pulse signals after the start of winding. FIG. 11B shows Pst
In addition, the effects of temperature are taken into account. There are two possible reasons for changing Pst depending on the temperature. One is a change in the stop position of the film. The other is a change in the film moving amount with respect to one pulse signal output from the PI 32 due to a change in the diameter of the roller member 72.

In step S32, PICNT and P
If ST matches, step S3 to start magnetic recording
Move to 3. Then, the head address #ADst of the data to be magnetically recorded is set in the register ADRS (step S33). Subsequently, the data at the address designated by ADRS is read and stored in the register datax (step S
34) The data of datax is decomposed by 1 bit (step S35), and it is determined whether the divided bits are "1" or "0" (step S36).

In step S36, if it is "1", the data of TBF is set to the second timer counter (T2) (step S37), and if it is "0", it is set to the second timer counter (T2). Set the TBR data (step S3
8). Thereafter, the counting operation of the timer is started (step S39), and the direction of the current of the magnetic head 24 is reversed from (+) to (-) (step S40). This operation is performed at the timing of * 3 in the time chart of FIG.
The second timer counter counts the set time (TBR or TBR
BF), an interrupt request signal is generated (FIG. 12).
In the time chart of *). When this signal is generated, an interrupt routine of FIG. 13 to be described later is called.

In the interrupt routine, the direction of the current of the magnetic head 24 is reversed. Then, in order to generate the next interrupt request signal, TBF or TBR is set in the second timer counter (T2) according to the data to be magnetically recorded. Since TBR and TBF change according to the film speed by the processing of steps S26 to S30, the film speed and the magnetic recording speed move in conjunction. Therefore,
Even if the film speed changes, the recording density does not change.

The processing when the PI pulse is input has been described above. Next, the processing when the perforation is detected will be described with reference to FIG. First, in step S41, the microcomputer 11 determines whether there is a change in the signal of PR33 from the input port P-PR. Here, when a change is detected, the register PRCNT for counting the signal edges of PR33 is incremented (+1) (step S42). Subsequently, it is determined whether the value of PPCNT has reached # 2 (step S43), and when it is equal to # 2, the process proceeds to step S44.

When the signal of * 4 on the time chart of FIG. 12 is detected, it is understood that the film winding operation is nearing the end. In order to easily stop the film, it is necessary to reduce the speed, and it is necessary to terminate the magnetic recording. This is because a gap is provided between the area where the magnetic data of the next frame is recorded and the current recording area for convenience in reproducing magnetic data. Subsequently, the operations of the first timer counter and the second timer counter are stopped. As described above, when the second timer counter is stopped, the interrupt request signal is not generated, so that the magnetic recording is stopped.

Since there is no need to measure the time interval of the PI pulse, T1 is also stopped (step S44). Next, a short brake is applied to the motor for a predetermined time (Ts1 on the time chart) (step S45), and the voltage applied to the motor is reduced (Vm2 on the time chart) (step S46). As described above, the speed of the film is rapidly reduced by reducing the short brake and the voltage. When the film 23 moves and the PRCNT reaches # 4, the winding operation ends (step S47).

Then, the flow shifts from step S47 to S48 (corresponding to * 5 in the time chart of FIG. 12). In step S48, the current of the magnetic head 24 is stopped.
Subsequently, a short brake is applied to the motor for a predetermined time (Ts2 on the time chart of FIG. 12) (step S4).
9). Further, a negative voltage is applied to the motor for a predetermined time (TR on the time chart of FIG. 12) (step S5).
0). Then, a short brake is applied to the motor for a predetermined time (Ts3 on the time chart of FIG. 12) (step S
51). The film 23 is completely stopped by the processes in steps S49 to S51. Then, the winding subroutine ends (step S52).

Note that parameters relating to film speed control (Vm1, Vm2, Ts1,
Ts2, Ts3, TR) should be stored in the storage circuit 17 in advance. This makes it possible to set optimal parameters according to the performance of each film feeding mechanism.

Next, the subroutine "interrupt" will be described with reference to the flowchart of FIG.
When the count operation of the second timer counter is started in step S39 in FIG. 7 described above, this routine is called every time the time set in the counter elapses (* on the time chart in FIG. Indicates the point where the routine is called).

In this sequence, the output port P-
The state of MG (+) and P-MG (-) is determined (step S100). If P-MG (+) is Hi, the process moves to step S105. Then, P-MG (+) is changed from Hi to Lo, and P-MG (-) is changed from Lo to Hi. As a result, the current direction of the magnetic head 24 changes from (+) to (−).

If the recorded bit data is "1", the TBF data is set in the second timer counter (T2) (step S107). If the bit data is "0", the TBF data is set in the second timer counter (T2). Set TBR data (step S
108).

On the other hand, when the interrupt routine is called, if P-MG (-) is Hi, P-MG (-) is changed from Hi to Lo, and P-MG (+) is changed from Lo to Hi.
(Step S101). As a result, the current direction of the magnetic head 24 changes from (-) to (+).
When the bit data being recorded is "1", the data of TBR is set to the second timer counter (step S1).
03). If it is "0", TBF data is set to the second timer counter (step S104).

When the processing in steps S101 to S104 is completed, the data recording for one bit has been completed, so that the next bit data must be read. It is determined whether data recording for one byte has been completed (step S10).
9). If the data recording for one byte has not been completed, the register datax is decomposed, set to bitx, and the process returns (steps S114 and S115).

On the other hand, when the data recording for one byte is completed, it is determined whether or not the register ADRS is #ADend (step S110). As shown in the memory map of FIG. 6, #ADend is the last address of the memory area where the magnetic data is stored. When ADRS is #ADend, it means that data recording has been completed. At this time, the second
The operation of the timer counter is stopped, and the process returns (steps S111 and S115). By the processing in step S111, the interrupt request signal is not generated, and the interrupt routine is not called.

When the process proceeds from step S110 to S112, ADRS is incremented (+1) (step S1).
12) Read the data at the address indicated by ADRS and set it to datax (step S113);
The data is divided by bits (step S114), and the process returns (step S115).

In the first embodiment described above, every time a PI pulse signal is input, a correction operation is performed during the interval time of the pulse signal, and Tbitf and Tbitr are read from the data table. Furthermore, Tbitf
And Tbitr were also subjected to a correction operation to produce a timing signal for magnetic recording.

As described above, in the first embodiment,
The correction calculation performed every time a PI pulse is input is stopped. Instead, the correction calculation may be performed collectively before the start of film winding. For this purpose, a slight modification is required to the flowchart of FIG.
The details will be described below.

FIG. 14 is a flowchart illustrating the operation according to the second embodiment. Here, only different points from FIG. 7 will be described. The processing in step S201 is a newly added processing step.

In step S201, correction is performed on all Tbitf and Tbitr on the data table shown in FIG. Then, the corrected data table is stored in the microcomputer 1
1 is stored in the RAM. FIG. 16 is a data table created by correcting the data table of FIG. 9 with Ct, Cf, and Cr of FIG. In step S29, Tbitf and Tbitr are read from FIG. 14 based on the value of TFV.

These Tbitf and Tbitr are set in registers TBF and TBR in S30. Step S30 in FIG.
Does not require the correction operation. Step S in FIG.
The correction calculation for TFV performed at 285 is not required.

Since the points other than the points described here are the same as those in the flowchart of FIG. 7, the description will be omitted. The advantage of the method described here is that the processing by the microcomputer during film driving can be reduced. In the method of FIG.
Each time the pulse signal is input, three correction calculations are required, which imposes a heavy load on the microcomputer.

However, in this case, since there is no correction operation, even if a PI pulse signal is generated with faster synchronization, it is possible to cope with it. That is, when winding the film at a higher speed, the method described here is advantageous. However, since the corrected Tbitf and Tbitr are all mapped on the RAM of the microcomputer, it cannot be realized if the capacity of the RAM is small.

As described in detail above, even if the size of the driven roller that generates the magnetic recording timing signal deviates from a predetermined value, the correction signal stored in the EEPROM is changed to change the timing signal to a predetermined value. Can be certified. This allows magnetic recording at a desired recording density.

The above embodiment of the present invention includes the following inventions. (1) Pulse signal generating means for generating a pulse signal as the film moves, measuring means for measuring the interval between the pulse signals, correcting means for correcting output data of the measuring means, and output of the correcting means Timing signal generating means for generating a timing signal based on data, recording means having a magnetic head for writing data to the film, and recording control for controlling a recording current to the magnetic head in synchronization with the timing signal Means, and a magnetically recordable camera. (2) In a camera using a film having a magnetic data recording track and capable of magnetic recording on the film, pulse signal generating means for generating a pulse signal every time the film moves by a predetermined amount in conjunction with the movement of the film Measuring means for measuring an interval between pulse signals by the pulse signal generating means, a magnetic recording data table having magnetic recording data corresponding to the interval value between the pulse signals, and correcting the interval value between the pulse signals by the measuring means Means for storing correction data for performing the correction, selecting means for determining and selecting the correction data in the storage means, and reading the magnetic recording data from the magnetic recording data table in accordance with the correction data by the selecting means. Reading means; and recording control means for controlling magnetic recording based on the magnetic recording data read by the reading means. Magnetic recordable camera characterized by comprising. (3) In a camera using a film having a magnetic data recording track and capable of magnetic recording on the film, a magnetic head for performing magnetic recording on the track, and a movement of the film by a predetermined amount when the film is fed. A pulse signal generating means for generating a pulse signal in accordance with the above, a measuring means for measuring an interval between the pulse signals, and a data table for storing a data table in which first data referred to according to the interval between the pulse signals is stored. A second storage unit for arbitrarily writing and storing second data for correcting the measurement value of the measurement unit; and correcting the measurement value of the measurement unit based on the second data. Correction means for performing, and a first storage means of the first storage means capable of corresponding to a correction value by the correction means.
A recording control means for controlling a recording current supplied to the magnetic head based on the data of (1). (4) In a camera using a film having a magnetic data recording track and capable of magnetic recording on the film, pulse signal generating means for generating a pulse signal every predetermined rotation in association with movement of the film; Correction means for correcting the pulse signal interval value by the pulse signal generation means,
A recording control means for controlling magnetic recording based on a correction pulse interval value by the correction means; (5) In a camera using a film having a magnetic data recording track and capable of magnetic recording on the film, pulse signal generating means for generating a pulse signal every time the film moves by a predetermined amount in conjunction with the movement of the film Measuring means for measuring an interval between pulse signals by the pulse signal generating means, a magnetic recording data table having magnetic recording data corresponding to the interval value between the pulse signals, and correcting the interval value between the pulse signals by the measuring means Means for storing correction data for performing the correction, selecting means for determining and selecting the correction data in the storage means, and reading the magnetic recording data from the magnetic recording data table in accordance with the correction data by the selecting means. Reading means; and recording control means for controlling magnetic recording based on the magnetic recording data read by the reading means. Magnetic recordable camera characterized by comprising. (6) In a camera using a film having a magnetic data recording track and capable of magnetic recording on the film, a pulse signal generating means for generating a pulse signal according to a predetermined movement of the film as the film moves; Correction means for correcting the fluctuation component of the pulse signal generation means, timing signal generation means for generating a timing signal based on the correction means, recording control means for controlling magnetic recording in synchronization with the timing signal, A magnetically recordable camera comprising: (7) In the above (1) to (6), the magnetically recordable camera records digital data by a pulse position modulation method on the recording track, and the recording control means further comprises one unit. A magnetically recordable camera that controls the timing of deviation of a pulse signal in a bit cell. (8) The camera capable of magnetic recording according to any one of (1) to (6), wherein the pulse signal generating means has a rotating member that rotates following the movement of the film. (9) In the above (6), the pulse signal generating means has a rotating member having a predetermined diameter which rotates in accordance with the movement of the film, and the correcting means has a predetermined diameter of the rotating member. A magnetically recordable camera that compensates for variations and / or variations in actual diameter dimensions relative to dimensions.

[0087]

As described in detail above, according to the present invention,
It is possible to provide a magnetically recordable camera capable of recording data at a desired value even if the resolution of the detection means changes.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a camera capable of magnetic recording according to a first embodiment.

FIG. 2 is a diagram showing a detailed configuration of a magnetically recordable camera according to the first embodiment.

FIG. 3 is a perspective view of the film feeding mechanism 26 of the camera as seen through from behind.

FIG. 4 is a view showing a state in which a coupler 55 is engaged with a groove provided on an upper end surface of a feed spool 57 provided on a patrone 56 and is integrally formed around the shaft with the feed spool 57.

FIG. 5 is a flowchart illustrating a main routine of the camera capable of magnetically recording according to the first embodiment.

FIG. 6 is a diagram showing an example of data created in step S18 of FIG.

FIG. 7 is a flowchart showing an operation of a subroutine “winding-up”.

FIG. 8 is a flowchart showing an operation of a subroutine “winding-up”.

FIG. 9 is a diagram illustrating an example of a data table.

FIG. 10 is a time chart for explaining a method of creating data stored in a table.

FIG. 11 is a diagram illustrating an example of correction data stored in a storage circuit 17;

FIG. 12 is a flowchart showing an operation of a subroutine “interrupt”;

FIG. 13 is a time chart illustrating an operation of the microcomputer 11;

FIG. 14 is an operation flowchart according to the second embodiment.

FIG. 15 is an operation flowchart according to the second embodiment.

FIG. 16 is a diagram showing a data table according to the second embodiment.

FIG. 17 is a diagram for explaining magnetic recording by the PPM method according to the related art.

FIG. 18 is a diagram showing a change in film speed when a film is wound up by one frame according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pulse generation part 2 Pulse width measurement part 3 Correction part 4 Data table 5 Timing generation part 6 Magnetic head drive part 7 Magnetic head 8 EEPROM 9 Film

Claims (3)

[Claims] 1. A camera using a film having a magnetic data recording track and capable of magnetic recording on the film, wherein a pulse signal for generating a pulse signal every time the film moves by a predetermined amount in conjunction with the movement of the film Generating means; correcting means for correcting the interval value of the pulse signal by the pulse signal generating means; timing signal generating means for generating a timing signal based on the corrected output value by the correcting means; And recording control means for controlling magnetic recording. 2. A camera using a film having a magnetic data recording track and capable of magnetically recording on the film, comprising: a pulse signal generating means for generating a pulse signal in accordance with the movement of the film; Measuring means for measuring, a correcting means for correcting an output value of the measuring means based on data of the storing means, a timing signal generating means for generating a timing signal based on a corrected output value by the correcting means, And a magnetic control means for controlling magnetic recording in synchronization with the timing signal. 3. A camera using a film having a magnetic data recording track and capable of magnetic recording on the film, comprising: a magnetic head for performing magnetic recording on the track; and a predetermined amount of film when the film is fed. A pulse signal generating means for generating a pulse signal in accordance with the movement; a measuring means for measuring an interval between the pulse signals; and a data table storing first data referred to according to the interval between the pulse signals. First storage means, second storage means for arbitrarily writing and storing second data for correcting the measurement value of the measurement means, and correction to the measurement value of the measurement means based on the second data And a control unit for controlling a recording current flowing through the magnetic head based on the correction measurement value obtained by the correction unit and the first storage unit. Magnetic recordable camera characterized by comprising a control means.