JPH1031264A - Magnetic recording rewritable camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording rewritable camera capable of surely erasing magnetic data already recorded and magnetically recording new magnetic data again. SOLUTION: The perforation of film 25 is detected by a photoreflector 26 and the movement of the film 25 is detected by a photointerrupter 27. Furthermore, this camera is provided with an information holding means holding information recorded in a magnetic recording area on the film 25 and changing the recorded information held according to an instruction by a photographer. In the case the recorded information in the information holding means is changed, a recording start position is decided by rewinding the film 25 by one or more frames and then winding it by specified amount based on output from the photoreflector 26 and the photointerrupter 27 by a microcomputer 11. When the film 25 reaches the recording start position, the information in the information holding means is magnetically recorded on the film 25 by a magnetic head 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable camera capable of recording data on a magnetic recording portion of a film. The present invention relates to a camera capable of rewriting magnetic recording.

[0002]

2. Description of the Related Art Cameras capable of recording photographic data such as date and printing conditions on a magnetic recording portion of a film are already known. In this camera,
After the photographing is completed, the exposure frame is wound up. In general, during this winding operation, the magnetic head provided in the camera is driven to record the photographed data at a predetermined position of the magnetic recording section of the film.

In a conventional camera having no magnetic recording means as described above, information is optically printed on a film. Therefore, the information once recorded cannot be corrected. Further, even if a problem occurs in the recording operation, it is not possible to execute the recording operation again to correctly record information. However, the magnetically recorded information described above can be changed by repeating the recording operation.

In recent years, various proposals have been made for cameras capable of recording photographic data on the magnetic recording portion of the film. For example, Japanese Unexamined Patent Publication No.
Japanese Patent Application Laid-Open Publication No. H11-163873 discloses a method for coping with a case where desired data cannot be recorded in a magnetic recording operation during film winding. In this proposal, after the film is rewound by one frame, the recording conditions are changed and magnetic recording is performed again.

Japanese Patent Application No. 7-267042 describes a method of performing magnetic recording during a winding operation after an exposure operation using two sensors provided in a camera. One sensor is used to detect the position of the film and generates a detection signal, and the other sensor generates a pulse signal in conjunction with the movement of the film. Magnetic recording is
It is executed in synchronization with this pulse signal.

[0006]

However, when correcting the magnetic data recorded in the magnetic recording section, it is necessary to correctly control the position of the film when the film is rewound. That is, the magnetic head and the position where the magnetic data is recorded must be matched with a predetermined accuracy. Otherwise, when you perform magnetic recording again,
Problems such as destruction of data that does not need to be changed and inability to change the target data occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in view of the above circumstances. It is an object of the present invention to provide a rewritable magnetic recording camera capable of securely erasing data and magnetically recording new magnetic data again.

[0008]

In order to achieve the above object, a magnetic recording / rewritable camera according to the present invention comprises a first detecting means for detecting film perforation and a second detecting means for detecting movement of the film. Detecting means, while holding the information to be recorded in the magnetic recording area on the film, the information holding means capable of changing this recording information by the photographer's instruction, if the information holding means is changed,
The film is set to one based on the output of the first and second detecting means.
After rewinding more than one frame, positioning means for winding up by a predetermined amount to determine a recording start position, and magnetic recording means for magnetically recording information of the information holding means on the film when the film reaches the recording start position. It is characterized by having.

Further, in the rewritable camera for magnetic recording according to the present invention, the positioning means determines the recording start position based on the perforation of the photographing frame one frame before in the film rewinding direction as a reference position. .

Further, the magnetically rewritable camera of the present invention starts the film winding operation after the photographing operation is completed, and responds to the output of the first detecting means for detecting the perforation defining the photographing frame, thereby winding the film. Upon completion of the operation, in conjunction with this winding operation, based on the output of the second detecting means for generating a pulse signal with a predetermined resolution in accordance with the movement of the film, a magnetic recording area provided on the film is formed. The magnetic recording start timing is determined, and the information recorded in the magnetic recording area of the film can be recorded again in order to change the information.

That is, in the magnetic recording / rewritable camera of the present invention, when the exposure frame is wound after the exposure to the film is completed, the film for one frame is wound based on the output of the first detecting means. . The first detecting means detects perforations formed on the film to determine the position of each frame. During the one-frame winding operation, the start of the magnetic recording operation is determined by the positioning means based on the output of the second detecting means, and data is recorded in the magnetic recording area on the film by the magnetic recording means. . The second detection means generates a predetermined number of pulse signals each time the film moves by a unit length.

When changing the data recorded on the film, the film is moved in the rewinding direction based on the output of the first detecting means. The moving amount at this time is larger than the length of one frame. Further, the film is wound up by the same length as this moving amount. During this winding operation, a magnetic recording operation is performed, and data already recorded is erased by the magnetic recording means, and new data is recorded at the same time. At this time, the start of the magnetic recording operation is determined based on the output of the first detecting means and the output of the second detecting means.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a magnetic recording / rewritable camera according to an embodiment of the present invention.

In this camera, the operation of the entire camera is controlled by a microcomputer 11. The microcomputer 11 has a photometric circuit 12, a distance measuring circuit 13, a shutter control mechanism 14, a focus adjustment mechanism 15, and a display circuit for displaying various information such as shooting information, date, and camera operation mode. 1
6, and a storage circuit 17 which is composed of an EEPROM and stores the number of film frames, camera adjustment data, and the like.

Further, the microcomputer 11 has a release switch (RELSW) 1 for starting an exposure operation.
8 and a rewind switch (REWSW) 19 which is operated when rewinding the film after the photographing to the patrone.
And a patrone detection switch (PTSW) 20 that is turned on when the patrone is loaded into the camera, a power switch (PWSW) 21 linked to the power supply of the camera, and print number data, one of the magnetic data, are set. And a rewrite switch (RWSW) 23 that is operated when the magnetic recording operation is performed again.

The magnetic head 24 records data on a magnetic layer on the film 25. 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, FIG.
In order for the current to flow in the direction ((+) direction) shown in FIG.
The potential of −MG (+) is changed from “Low (Lo)” to “Hig
h (Hi) ”. Then, the limiting resistance Rb
The transistor Q1 is turned on by the current flowing through the transistor and current flows in the direction shown in FIG. Then, the magnetic material of the magnetic layer on the film 25 is magnetized in a predetermined direction. The resistance Rg is provided to limit the current flowing through the magnetic head 24. In order to flow a current in the direction opposite to the direction shown in FIG.
G (−) may be set from “Lo” to “Hi”.

The film 25 is provided with a perforation for defining and detecting the position of the film. The perforations are detected by a photo reflector (hereinafter referred to as PR) 26. A photo interrupter (hereinafter, referred to as PI) 27 measures the moving amount and moving speed of the film 25. At this time, the disk with slit 28 rotates in conjunction with the movement of the film 25 and the PI 27
To change the output signal. A bar code 30 is formed on the spool shaft of the cartridge 29. The barcode 30 stores the sensitivity of the film 25 and the number of shots. The data of the barcode 30 is detected by PR31.

The output signals of PR26, PI27, and PR31 are converted into signals that can be input to the microcomputer 11 by a signal processing circuit 32. The output signal of PR26 is output to an input port P-PR, and the output signal of PI27 is input. The signal is output to port P-PI, and the output signal of PR31 is output to input port P-BPR.

The control of the winding and rewinding of the film 25 is performed via a drive circuit 33 by the film feeding mechanism 3.
4 by a motor connected to the motor. The film feeding mechanism 34 will be described later.

The clock circuit 35 creates data of “year”, “month”, “day”, “hour”, and “minute” magnetically recorded on the film 25. The communication circuit 36 is used when the camera and the external control device 37 communicate with each other. External control device 37
Is a personal computer used in a camera production line or the like. The adjustment data stored in the storage circuit 17 can be changed by the personal computer. The temperature measurement circuit 38 outputs temperature data of the camera to the microcomputer 11.

Next, the film feeding mechanism 3 of the present camera
4 will be described. FIG. 2 is a perspective view of the film feeding mechanism 34 seen from behind the camera. The state of the film feeding mechanism 34 is shown immediately after the film cartridge 29 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.
Are in mesh with the sun gear 43. Further, the sun gear 43 meshes with the planetary gear 44, and the planetary gear 4
4 is supported by the gear arm 45 so as to revolve around the rotation axis of the sun gear 43.

A take-up spool 46 for taking up a film is rotatably provided in a film take-up chamber provided on the right side as viewed from the rear of the camera body.
The upper end surface of the take-up spool 46 has the planetary gear 44
Is revolved in the counterclockwise direction, a spool gear 47 meshing with the planetary gear 44 is provided integrally. The film pressing plate 48 presses the film against the take-up spool 46 by the tension of the spring 48a.

When the planetary gear 44 revolves clockwise, the idle gear 49 is brought into a position where it meshes with the planetary gear 44.
Is provided. This idle gear 49 is 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 cartridge storage chamber for storing the cartridge 29. Above the cartridge storage chamber, the coupler gear 53 having a coupler 55 whose tip projects in a “-” shape is rotatably provided.
As shown in FIG. 3, the coupler 55 is engaged with a groove provided on an upper end surface of a feed spool 57 provided in the cartridge 29, and is integrated with the feed spool 57 around the axis.

The camera main body is provided with a film delivery motor (M2) 58. A pinion gear 59 is provided on the output shaft of the film delivery motor 58. The pinion gear 59 meshes with a sun gear 60, and the sun gear 60 meshes with a planetary gear 61. The planet gear 61 is supported by 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 5 only when the film feed motor 58 (M2) rotates counterclockwise.
2 meshes. The film 25 is exposed with light from the opening 64 of the camera body.

On the other hand, the PR 26 is for detecting perforations provided on the film 25. As shown in FIG. 3, perforations 25a are provided on the right and left of the exposure area 25b of each frame of the film 25. The magnetic head 24 is arranged near the opening 64. A pad 65 is arranged so as to face the magnetic head 24 and sandwich the film 25 therebetween. This pad 65 is a leaf spring 6
6 and is pressed against the film 25 by the tension of the spring. Then, the magnetic head 24 records data in a magnetic data recording area 25c provided below the exposure area 25b.

The roller member 67 has an outer periphery made of rubber or the like, and rotates in conjunction with the movement of the film 25. A disk 28 with a slit is integrated with the rotation shaft of the roller member 67. Therefore, when the roller member 67 rotates, the slit disk 28 rotates. Each time the slit of the slit disk 28 crosses the PI 27, a signal serving as a reference for the timing of the recording operation is output from the PI 27.

Next, the operation of the magnetic recording / rewritable camera of this embodiment will be described. FIG. 4 is a flowchart showing a main routine of the operation of the magnetic recording / rewritable camera. In the following description, the reference numerals of the components shown in FIG.

First, when the power switch (PWSW) 21 is turned on, the microcomputer 11 is reset by power-on. Then, the microcomputer 11 initializes an I / O port, initializes a memory, and the like (step S1).

Subsequently, the microcomputer 11 controls the external control device 37.
Is determined (step S2). Here, when there is a communication request, the microcomputer 11 receives the address and data of the storage circuit 17 from the external control device 37 (steps S3 and S4), and updates the data of the storage circuit 17 (step S5). When the data update is completed in this way, the process returns to step S2, and the processes after step S2 are repeated. By the processing of steps S2 to S5,
The adjustment data stored in the storage circuit 17 can be arbitrarily changed. The adjustment 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 (PTSW) 20 (step S6).
Then, when the PTSW 20 changes from “off” to “on”, the process proceeds to step S7. In step S7, the film sensitivity and the number of frames are read from the barcode 30. Subsequently, the microcomputer 11 transfers the film 25 from the cartridge 29.
Is pulled out and wound around the take-up spool 46. Then, the film 25 is moved so that the exposure area of the first frame of the film 25 matches the opening 64 of the camera body (step S8). Further, the microcomputer 11 clears (← 0) the rewrite permission flag (F-RWEN) (step S9). Here, when the rewrite permission flag is “0”, the rewrite operation is prohibited, and when the rewrite permission flag is “1”, the rewrite operation is permitted. The rewrite operation will be described later. Then, the process returns to step S6, and
The processing after 6 is repeated.

In step S6, the PTSW 20
If there is no change in the state, the microcomputer 11 determines the state of the rewind switch (REWSW) 19 (step S10). Here, when the REWSW 19 changes from “off” to “on”, an operation of rewinding the film 25 to the cartridge 29 is executed (step S1).
1). Thereafter, the process returns to step S6, and returns to step S6.
The subsequent processing is repeated.

On the other hand, when there is no change in the REWSW 19, the process proceeds to step S12. Then, it is determined whether or not the state of the print number setting switch (PQSW) 22 has changed (step S12). Here, PQSW
When the number 22 has changed from "off" to "on", the print number data, which is one of the magnetic data, is changed (step S13), and thereafter, the process returns to step S6 and repeats the processing from step S6. . The print number data cyclically changes each time the PQSW 22 is operated as shown in FIG.

When there is no change in PQSW22,
Move to step S14. Then, it is determined whether or not the state of the rewrite switch (RWSW) 23 has changed (step S14). Here, when the RWSW 23 changes from “off” to “on”, the state of the rewrite permission flag (F-RWEN) is determined (step S1).
5). When the rewrite permission flag is “0”, RW
Even if SW23 is operated, the rewrite operation cannot be executed.
Therefore, the process returns to step S6, and the processes after step S6 are repeated.

Here, in order to execute the rewrite operation, it is necessary to rewind the film 25. However, when this flag is "0", it indicates that the film 25 is at the initial position (the first frame is opposed to the aperture of the camera), and that the film is at the initial position means that the film 25 is at the initial position. This indicates that no frame has been wound up (magnetic recording has not been performed). Therefore, a rewrite operation for re-recording data is not required. If executed, the film 25 wound around the take-up spool 46 may come off when the film 25 is rewound. Therefore, if the rewrite permission flag is “0”, the rewrite operation is prohibited.

In step S15, when the rewrite permission flag is "1", the rewrite operation is permitted,
The following operation is performed. First, a subroutine "rewind one frame" is executed (step S16). This subroutine will be described later. Subsequently, data to be magnetically recorded (re-recorded) is created (step S17). FIG. 6 shows an example of data created at this time. Then, a subroutine "rewrite" is executed (step S18), and the magnetic recording data on the film 25 is rewritten. This subroutine "rewrite" will be described later. afterwards,
Returning to step S6, the processing from step S6 is repeated.

If there is no change in the RWSW 23 in step S14, the process proceeds to step S19. And
The state of the power switch (PWSW) 21 is determined (step S19). Here, when the PWSW 21 is “OFF”, the microcomputer 11 ends the main routine and stops the operation of the camera.

On the other hand, when the PWSW 21 is "ON",
Move to step S20. Then, the microcomputer 11 receives the temperature data from the temperature measurement circuit 38 (Step S)
20). Subsequently, the microcomputer 11 determines the shutter speed Tv and the aperture value Av based on the luminance data received from the photometry circuit 12 and the sensitivity data read in step S7.
Is calculated (step S21). Then, the calculated shutter speed Tv and aperture value Av are displayed on the display circuit 16 (step S22).

Next, the microcomputer 11 determines the state of the release switch (RELSW) 18 (step S2).
3). Here, when there is no change in the RELSW 18, the process returns to the step S6, and the processes after the step S6 are repeated.

On the other hand, when the RELSW 18 is "ON", the microcomputer 11 calculates the distance to the subject (subject distance) based on the data output from the distance measuring circuit 13 (step S24). Then, the focus adjustment mechanism 15 is controlled based on the data of the subject distance (step S25),
Further, based on the already calculated Tv value and Av value, the shutter control mechanism 14 is controlled to perform exposure to the film 25 (step S26).

When the exposure operation is completed, the microcomputer 11 creates data to be recorded on the magnetic layer of the film 25 (step S27). FIG. 6 shows an example of the data created in step S27 at this time. These data are stored in a predetermined code (for example, ISO code, etc.)
The data converted by the table is used, and the microcomputer 11
Is stored in the RAM. Here, address # ADst ~
#ADend data is decomposed into bit data,
Magnetic recording is performed in conjunction with the film winding operation after photographing in the next step.

After the completion of the recording data creation in step S27, a subroutine "winding up one frame" is executed (step S28). In this subroutine "winding up one frame", the film 25 is wound up by one frame, and the data created in step S27 is magnetically recorded. Subsequently, the microcomputer 11 sets the rewrite permission flag (F-RWE).
N) is set (← 1) (step S29). Thereafter, the rewrite operation can be executed. After that, the process returns to step S6, and the processes after step S6 are repeated.

Next, the operation of the subroutine "winding up one frame" will be described with reference to the flowchart shown in 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 by utilizing the interrupt function of the microcomputer 11.

When the subroutine "winding up by one frame" is started, the microcomputer 11 reads the parameters relating to magnetic recording from the storage circuit 17 and the winding / rewinding motor (M
1) Read out 41 control parameters (step S3)
0) Further, the registers PICNT and PRCNT are cleared (← 0) (step S31). Where PICN
T is a register for counting the pulse signal output from the PI 27, and PRCNT is a register for counting changes in the signal of the PR 26.

Subsequently, the microcomputer 11 controls the motor (M1)
An application voltage (Vm1) of 41 is set (step S32),
The motor (M1) 41 is turned on (step S33). This operation is performed at the timing of * 1 on the timing chart shown in FIG. 8, whereby the film 25 starts to move.

Immediately after the motor (M1) 41 is turned on, a current is supplied to the magnetic head 24 in the (+) direction (step S34). Subsequently, a first timer counter (T1)
Is started (step S35). This first timer counter (T1) is used to measure the interval of the pulse signal of the PI 27. T1 on the timing chart shown in FIG. 8 is the interval of the pulse signal.

Next, the microcomputer 11 sets the input port P-PI
It is determined whether a PI pulse has been input from the state (1) (step S36). When the PI pulse signal is input, the data of the first timer counter (T1) is recorded in the register TFV (step S37), and the first timer counter (T1) is used to measure the interval of the next pulse signal.
The value of 1) is cleared (← 0) (step S38).

Subsequently, based on the data of the register TFV, the parameters Tbitf and Tbit necessary for magnetic recording
r is read from the data table existing in the program memory (step S39). FIG. 9 shows an example of the data table. Here, it is assumed that the pulse of PI 27 is generated every time the film moves by 0.5 [mm]. Then, magnetic recording is performed at a recording density of 10 (bits / mm).

Here, a method of creating data to be stored in the data table will be described with reference to a timing chart shown in FIG. Since the pulse of the PI 27 is emitted every time the film moves 0.5 [mm], in order to make the recording density (WD) of the film 10 (bits / mm), 5 bits are generated during one pulse. You just have to record the data. Therefore, the recording time (Tbit) of 1-bit data is T1 / 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) xTbit. When the current of the magnetic head 24 is controlled at a time interval between Tbitf and Tbitr, bit “1” is recorded on the film.

The value of the first timer counter (T1) changes according to the speed of the film 25. Therefore, assuming the maximum value and the minimum value of the film speed in advance and calculating Tbitf and Tbitr for T1 in this range, FIG.
It is a data table shown in FIG. In addition, film speed 10
The data table corresponds to 0 to 50 [mm / sec].

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 the flowchart shown in FIG.
Tbitf and Tbitr are read using the data recorded in the register TFV as the address of the data table (step S39). Subsequently, the microcomputer 11 multiplies Tbitf read from the data table by the correction value Cf and stores it in the register TBF, and multiplies Tbitr by the correction value Cr and stores it in TBR (step S40). The correction values Cf and Cr have been read from the storage circuit 17 in step S30.

Here, as shown in the timing chart of FIG. 8, the time for reversing the current direction of the magnetic head 24 is determined based on the data of TBF and TBR.
Specifically, the data of TBF and TBR is set in a second time counter (T2) for generating an interrupt operation. The magnetic recording conditions (WD
= 10 [bits / mm], BL1 = 75 [%], BL
0 = 25 [%]) can be changed. An example is shown below.

WD is set to 20 without changing BL1 and BL0.
To change to [bits / mm], Cf = Cr =
It may be set to 0.5. On the other hand, if you want to change BL1 to 60% and BL0 to 40% without changing WD,
Cf = 0.8 and Cr = 1.6 may be set. That is, it is understood that the recording conditions can be arbitrarily changed by changing the correction values of Cf and Cr with the recording conditions of the data table as the center.

Next, the microcomputer 11 increments (+) the register PICNT for counting the number of PI pulses.
1) (Step S41), it is determined whether or not PICNT is equal to a predetermined number PST (Step S42). This predetermined number PST indicates the magnetic recording start position on the film (corresponding to the timing of * 2 on the timing chart shown in FIG. 8). Note that the predetermined number PST is determined in step S30.
Is read from the storage circuit 17.

In the above step S42, PICNT
Is equal to PST, the process proceeds to step S43 to start magnetic recording. Then, the head address #ADst of the data to be magnetically recorded is set in the register ADRS (step S43). Subsequently, the data at the address specified by the ADRS is read and stored in the register dataX (step S44), the data of dataX is decomposed by one bit (step S45), and the divided bit is “1” or “0”. Is determined (step S46).

In this step S46, when the bit is "1", the data of TBF is set to the second timer counter (T2) (step S47), and when the bit is "0", the second timer counter (T2). Then, the data of TBR is set (step S48). Thereafter, the counting operation of the second timer counter (T2) is started (step S4).
9) The current direction of the magnetic head 24 is changed from (+) to (−).
(Step S50). This operation is performed at the timing of * 3 on the timing chart shown in FIG.

When the set time (TBR or TBF) elapses, the second timer counter (T2) generates an interrupt request signal (corresponding to * in the timing chart shown in FIG. 8). When this signal occurs, a subroutine "interrupt" shown in FIG. 11 is called.

In the subroutine "interrupt", 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. TBF and TBR are determined in steps S36 to S49.
As a result, the film speed and the magnetic recording speed move in conjunction with each other. Therefore, even if the film speed changes, the recording density does not change. The above is the processing in the microcomputer 11 when the PI pulse is input.

Next, the processing when the perforation provided on the film 25 is detected will be described. If the PI pulse signal is not input in step S36, or if the register P
When ICNT is not equal to the predetermined number PST, or after the processing in step S50, the process proceeds to step S51.

In step S51, the microcomputer 11 determines whether or not there is a change in the signal of PR26 from the input port P-PR. Here, if a change is detected, PR26
Is incremented (+1) in the register PRCNT that counts the signal edge of (step S52). continue,
It is determined whether the value of PRCNT is equal to # 2 (step S53), and when it is equal to # 2, the process proceeds to step S54.

When the signal of * 4 on the timing chart shown in FIG. 8 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 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.

In step S54, the microcomputer 11
Timer counter (T1) and the second timer counter (T
Stop the operation of 2). As described above, by stopping the second timer counter (T2), the interruption request signal is not generated, so that the magnetic recording is stopped. Further, since it is not necessary to measure the time interval of the PI pulse, the first timer counter (T1) is also stopped.

Subsequently, a short brake is applied to the motor (M1) 41 for a predetermined time (Ts1 on the timing chart shown in FIG. 8) (step S55).
The applied voltage 41 is decreased (Vm2 on the timing chart shown in FIG. 8) (step S56). As described above, the speed of the film 25 is rapidly reduced by reducing the short brake and the voltage. Thereafter, in step S51, when there is no change in the signal of PR26, the process returns to step S36, and the processes in step S36 and thereafter are repeated.

In step S53, the PRC
If the value of NT is not equal to # 2, it is determined whether the value of PRCNT is equal to # 4 (step S57). If it is not equal to # 4, the process returns to step S36.
On the other hand, when it is equal to # 4, the winding operation ends,
The microcomputer 11 stops the current to the magnetic head 24 (corresponding to * 5 on the timing chart shown in FIG. 8).
(Step S58).

Subsequently, a short brake is applied to the motor (M1) 41 for a predetermined time (Ts2 on the timing chart shown in FIG. 8) (step S59). Further, a negative voltage is applied to the motor (M1) 41 for a predetermined time (TR on the timing chart shown in FIG. 8) (step S6).
0). Further, a short brake is applied to the motor (M1) 41 for a predetermined time (Ts3 on the timing chart shown in FIG. 8) (step S61). The film 25 is completely stopped by the processing in steps S59 to S61. As described above, the subroutine "wind one frame"
Is ended (step S62).

Note that Vm1 and Vm1, which are parameters related to the speed control of the film on the timing chart shown in FIG.
m2, Ts1, Ts2, Ts3, and TR should be stored in the storage circuit 17 in advance. As a result, optimal parameters can be set in accordance with the manufacturing characteristics of the film feeding mechanism 34 and the environment in which the camera operates.

FIG. 12 is a diagram showing an example of setting these parameters. In this setting example, it is set so that an optimum parameter can be selected according to the temperature (t). The microcomputer 11 may read out a predetermined parameter from the storage circuit 17 based on the temperature data input from the temperature measurement circuit 38. Further, if the optimum parameters are obtained, it is necessary to set the above parameters in consideration of the type of the film and the voltage of the battery for operating the camera.

Next, the operation of the subroutine "interrupt" will be described with reference to the flowchart shown in FIG. When the count operation of the second timer counter (T2) starts in step S49 of FIG. 7 described above, the subroutine “interrupt” is called every time the time set in the counter elapses (see FIG. 8). The * on the timing chart shown indicates the point at which the "interrupt" is called).

When the subroutine “interrupt” is started, the microcomputer 11 outputs the output port PM of the microcomputer 11.
The state of G (+) and P-MG (-) is determined (step S70). Here, when P-MG (+) is “Hi”, the microcomputer 11 changes P-MG (+) from “Hi” to “L”.
o ”, and P-MG (−) is changed from“ Lo ”to“ Hi ”.
(Step S75). Thereby, the direction of the current of the magnetic head 24 changes from (+) to (−).

Subsequently, it is determined whether the recorded bit data is "1" or "0" (step S7).
6). If the bit data is "1", the data of TBF is set in the second timer counter (T2) (step S2).
77) On the other hand, if it is "0", the data of TBR is set in the second timer counter (T2) (step S7).
8). Thereafter, the present subroutine ends (step S
85).

When the subroutine "interrupt" is called, in step S70, P-MG
When (−) is “Hi”, the microcomputer 11 performs the P-M
G (-) is changed from “Hi” to “Lo”, and P-MG
(+) Is changed from “Lo” to “Hi” (step S
71). As a result, the direction of the current of the magnetic head 24 changes from (-) to (+).

Subsequently, it is determined whether the recorded bit data is "1" or "0" (step S7).
2). When the bit data is "1", the data of TBR is set in the second timer counter (T2) (step S2).
73) On the other hand, if it is "0", the data of TBF is set to the second timer counter (T2) (step S7).
4).

When the processes in steps S71 to S74 are completed, data recording for one bit has been completed, and the next bit data must be read. Then, the microcomputer 11 determines whether or not the data recording for one byte has been completed (step S79). If the data recording for one byte has not been completed, step S
The process jumps to step 84, where the register dataX is disassembled and set to bitX (step S84), and this subroutine ends (step S85).

On the other hand, when the data recording for one byte has been completed, the microcomputer 11 sets the register ADRS to #AD.
End is determined (step S80). Here, as shown in the memory map of FIG. 6, #ADend
Is the last address of the memory area where the magnetic data is stored. Therefore, when ADRS is #ADend, data recording has been completed. At this time, the operation of the second timer counter (T2) is stopped (step S81),
This subroutine ends (step S85). By the processing in step S81, no interrupt request signal is generated, and the subroutine "interrupt" is not called.

When the register ADRS is not #ADend, the microcomputer 11 increments ADRS (+
1) (Step S82), the data at the address indicated by the ADRS is read, and set in the register dataX (Step S83). Then, register dataX
Is decomposed for one bit and set to bitX (step S84), and this subroutine ends. (Step S85).

FIG. 13 is a diagram showing the movement of the film. Before describing the subroutine "one frame rewind" and the subroutine "rewrite", the movement of the film will be comprehensively described. FIG. 13A shows a state immediately after the exposure for the frame X is completed. FIG. 13B shows the position of the film immediately after the execution of the subroutine "winding up one frame", and the magnetic data X is the data recorded at this time. In the subroutine "wind one frame",
The winding / rewinding motor (M1) 41 is controlled based on the perforations P1 and P2. P1 and P2 on the timing chart shown in FIG.
1 and P2 correspond to each other.

The camera operator operates the rewrite switch (RW
SW) 23, the microcomputer 11 that detects this
Needs to rewind the film to perform the rewrite operation. FIG. 13C shows a position when the film is rewound. That is, this is the position of the film immediately after the subroutine "one frame rewind" described later is executed. In the subroutine "one frame rewind", the microcomputer 11 controls the hoisting / rewinding motor (M1) 41 based on the perforations P1, P2, P3, P4.

FIG. 13D shows the position of the film when the rewrite operation is performed. That is, the position of the film immediately after execution of a subroutine "rewrite" described later. The position of this film is shown in FIG.
Will be the same as In the subroutine "rewrite", the microcomputer 11 controls the hoisting / rewinding motor (M1) 41 based on the perforations P4, P3, P2 and P1.

Next, the operation of the subroutine "rewind one frame" will be described with reference to the flowchart shown in FIG. When the subroutine "one frame rewind" is started, the microcomputer 11 reads the control parameters of the hoist / rewind motor (M1) 41 from the storage circuit 17 (step S100). Further, the register PRCNT is cleared (← 0) (step S101). Register P
RCNT is a register for counting changes in the signal of PR26.

Subsequently, the microcomputer 11 controls the motor (M1) 4
1 (Vm1r) is set (step S1).
02). Then, the motor (M1) 41 is turned on so as to rotate counterclockwise (step S103). Thus, the film 25 starts moving in the rewinding direction.

Next, the microcomputer 11 sets the input port P-PR
It is determined whether or not there is a change in the signal of PR26 input to (step S104). Here, this determination is repeated until there is a change in the signal of PR26, and when there is a change in the signal, the process proceeds to step S105 and PRCNT is incremented (+1). Further, the microcomputer 11 determines whether the value of PRCNT is equal to # 6 (Step S106). When the value of PRCNT is equal to # 6, the short brake is applied to the motor (M1) 41 for a predetermined time (Ts1r) (step S107). FIG.
(A) is a timing chart showing the operation of this subroutine "1 frame rewind". The operation in step S107 corresponds to * 11 on this timing chart.

Subsequently, the microcomputer 11 controls the motor (M1) 4
The voltage applied to 1 is reduced to a predetermined value (Vm2r) (step S108). Then, the process returns to step S104,
The processing after step S104 is repeated. The film speed is reduced by the operations in steps S107 and S108. P1, P on the timing chart shown in FIG.
2, P3 and P4 are the perforations P shown in FIG.
1, P2, P3, and P4. PR2
6 passes through perforation P3, PRCNT
Becomes # 6.

In step S106, the PRCN
If the value of T is not equal to # 6, the microcomputer 11
Determines whether the value of PRCNT is equal to # 8 (step S109). Here, if the value of PRCNT is not equal to # 8, the process returns to step S104, and the processing after step S104 is repeated.

On the other hand, when the value of PRCNT is equal to # 8, the flow shifts to step S110. In FIG. 15A, P
When R26 passes through perforation P4, PRC
The value of NT becomes # 8. At this time, step S10
The process shifts from S9 to S110. The process of step S110 corresponds to * 12 on this timing chart. In this step S110, the microcomputer 11 applies a short brake to the motor (M1) 41 for a predetermined time (Ts2r).

Subsequently, the microcomputer 11 controls the motor (M1) 4
A positive voltage is applied to 1 for a predetermined time (TRr) (step S111). Further, a short brake is applied to the motor (M1) 41 for a predetermined time (Ts3r) (step S112). Steps S110, S111, S1
By the processing of 12, the film is completely stopped. Thereafter, this subroutine ends, and the routine returns.

The control parameters of the motor (M1) 41, Vm1r, Vm2r, Ts1r, Ts2r, Ts3
r and TRr should be stored in the storage circuit 17 in advance. As a result, optimal parameters can be set according to the manufacturing characteristics of the film feeding mechanism 34. FIG. 16 is a diagram showing a setting example of these parameters.

Next, the operation of the subroutine "rewrite" will be described with reference to the flowchart shown in FIG. FIG. 15B is a timing chart showing the operation of this subroutine "rewrite".

The operation of the subroutine "rewrite" is basically the same as the subroutine "wind one frame" described above, except for the following two points. In the "one frame rewind" described above, the film is rewound for "rewrite". At this time, the length of the rewound film is longer than the length of the film wound in the subroutine "one frame rewind". Therefore, the length of the film wound up in this subroutine is longer than one frame. This is the first point.

The second point is that the start timing of magnetic recording is changed. As shown in FIG. 13C, the magnetic head at the start of “rewrite” is positioned not on the (X) frame to be “rewritten” but on the (X−1) frame magnetic data. Therefore, if magnetic recording is started at the same timing as the subroutine "winding one frame", the magnetic data of the (X-1) frame is destroyed. I want to rewrite
(X) Only the magnetic data of the frame. Therefore, it is necessary to change the timing for starting energization of the magnetic head. The two points described above are the differences between the subroutine "wind one frame" and the subroutine "rewrite".

Therefore, in the description of the flowchart of FIG. 17, the description of the same operation as “winding up one frame” in FIG. 7 will be omitted. Steps S120, S121, S1
22 and S123 are performed in steps S30 and S3 in FIG.
Since the processing is the same as steps S1, S32 and S33, the description is omitted.

In step S124, the count permission flag (F-CNTEN) is cleared (0). In "winding up one frame" in FIG. 7, after the motor (M1) is turned on, energization of the magnetic head 24 is started, but this is not executed in "rewrite". As already explained, (X
-1) This is to prevent the magnetic data of the frame from being destroyed. Here, while the count permission flag is “0”, the register PRCNT is not incremented (+1) even if the pulse signal output from the PI 27 is detected. Therefore, magnetic recording does not start.

In step S125, the count of the first timer counter (T1) for measuring the width of the pulse signal of the PI 27 is started. Subsequently, in step S126, the microcomputer 11 determines the PI from the state of the input port P-PI.
It is determined whether or not the 27 pulse signal has been input. If no pulse signal has been input, the process proceeds to step S142. On the other hand, when the pulse signal has been input, the process proceeds to step S127.

Steps S127, S128, S12
9 and S130 are performed in steps S37 and S3 in FIG.
8, the processing is the same as that in steps S39 and S40, and a description thereof will be omitted. In step S131, the microcomputer 11 determines the state of the count permission flag (F-CNTEN). When this flag is "0", the counting of the pulse signal of the PI 27 is prohibited, so that steps S131 to S14 are performed.
Move to 2. On the other hand, if this flag is "1", the flow shifts to step S132 to increment (+1) the register PRCNT. The count permission flag is set (← 1) in step S145, which will be described later. This corresponds to the timing of * 21 on the timing chart shown in FIG.

Subsequently, in a step S133, it is determined whether or not the count value of the register PRCNT is equal to Pstr. When the count value of the register PRCNT is equal to Pstr, the flow shifts to step S134 to start magnetic recording. The processing in steps S134 to S141 is the same as the processing in steps S43 to S50 in FIG.
Description is omitted. This corresponds to the timing of * 22 on the timing chart shown in FIG.

On the other hand, if the count value of the register PRCNT is not equal to Pstr, the process proceeds from step S133 to S1.
Move to 42. The above Pstr is the same as the above step S120
Is a parameter read from the storage circuit 17 in FIG.

In the step S142, the microcomputer 11
Determines whether there is a change in the signal of PR26 from the state of the input port P-PR. When there is no change in the signal, the process returns to step S126, and when there is a change in the signal, the register PRCNT is incremented (+1) (step S143).

Subsequently, in step S144, the microcomputer 11 determines whether or not the count value of the register PRCNT is equal to # 4. When PRCNT is equal to # 4,
The count permission flag is set (← 1) (step S
145). When this flag is set, the pulse signal of the PI 27 can be counted in steps S131 and S132.

Then, in step S146, energization of the magnetic head 24 is started. This corresponds to the timing of * 21 on the timing chart shown in FIG. After that, the process returns to step S126, and returns to step S126.
The processing after 126 is repeated.

On the other hand, if it is determined in step S144 that the count value of the register PRCNT is not equal to # 4, the flow shifts to step S147 to determine whether the count value of PRCNT is equal to # 6. PRCNT is # 6
If it is equal to, the process moves to step S148. Steps S148, S149, and S150 are performed in S5 of FIG.
4, S55 and S56, and the description is omitted. By these processes, magnetic recording is stopped, and the moving speed of the film is reduced. This corresponds to the timing of * 23 on the timing chart shown in FIG. After that, the process returns to step S126, and returns to step S126.
The processing after 126 is repeated.

In step S147, the PRCN
When T is not equal to # 6, the microcomputer 11 further sets P
It is determined whether or not the count value of RCNT is equal to # 8 (step S151). PRCNT count value is # 8
If it is equal to, the process proceeds to step S152, while #
If it is not equal to 8, the process returns to step S126, and
The processing after step S126 is repeated.

The processing in steps S152 to S155 is the same as the processing in steps S58 to S61 in FIG.
Description is omitted. With these processes, the magnetic head 24
Is stopped, and the movement of the film 25 is also stopped. This corresponds to the timing of * 24 on the timing chart shown in FIG. Thus, the present subroutine ends and returns.

Pstr (step S133) for determining the start timing of magnetic recording is Pst (step S42 in FIG. 7) used in the subroutine "winding up one frame".
It will be a larger value. This is because the rewrite operation is not affected by the overrun of the film generated by the one-frame winding operation. Lor shown in FIG. 13B is the overrun amount. In the rewrite operation, as shown in the timing chart of FIG.
The number of pulses of PI 27 is counted based on 3 to determine the start of magnetic recording. Therefore, Pstr must correct the number of PI27 pulses corresponding to the overrun amount.

In the above embodiment, the input port P
The number of PI27 pulses was counted based on the fourth transition of -PR. However, the pulse number may be counted on the basis of any transition indicated by * 25 on the timing chart of FIG. However, Pstr requires correction of the amount of overrun and correction in consideration of the position of each transition on the film.

The start of energization of the magnetic head was performed with reference to the fourth transition of the input port P-PR.
1) Any transition may be used as a reference as long as the magnetic data of the frame is not destroyed.

As described above, according to the present embodiment, the photoreflector (PR) 26 for detecting perforation used in a conventional magnetically recordable camera is used.
The magnetic data of a desired frame can be rewritten only by two detecting means, that is, a photo interrupter (PI) 27 for detecting the moving amount and the moving speed of the film.

According to the above embodiment of the present invention, the following configuration is obtained. (1) The film winding operation is started after the photographing operation is completed, and the film winding operation is ended in response to the output of the first detecting means for detecting the perforation defining the photographing frame, and is linked with the film winding operation. A camera capable of magnetic recording that determines a magnetic recording start timing in a magnetic recording area provided on a film based on an output of a second detection unit that generates a pulse signal with a predetermined resolution as the film moves. Changing means for changing recording data held in the camera in response to a photographer's instruction; and data re-writing for instructing re-recording of data recorded on the film in response to the change in the recording data. The first predetermined amount of the film is moved in a direction opposite to the winding direction in response to the output of the recording instruction means and the data re-recording instruction means. Then, the film moving means for moving the film in the winding direction by a second predetermined amount, and the change in accordance with the output of the first and second detecting means in accordance with the movement of the film moving means in the winding direction. Means for determining a start timing for magnetically recording the recorded data, wherein the camera is capable of rewritable magnetic recording.

[0109]

As described above, according to the present invention, magnetic recording can be performed from a precise position with respect to a predetermined magnetic recording area on a film, so that already recorded magnetic data can be reliably recorded. And a magnetically rewritable camera capable of magnetically recording new magnetic data again.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a magnetically rewritable camera according to an embodiment of the present invention.

FIG. 2 is a perspective view of the film feeding mechanism viewed from behind the camera.

FIG. 3 is a diagram illustrating a configuration of a film cartridge and a film.

FIG. 4 is a flowchart showing a main routine of the operation of the magnetic recording / rewritable camera.

FIG. 5 is a diagram illustrating a state in which print number data changes cyclically by operating a print number setting switch (PQSW).

FIG. 6 is a diagram showing an example of data to be magnetically recorded (re-recorded).

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

FIG. 8 is a timing chart at the time of the operation of “winding up one frame”.

FIG. 9 is a diagram illustrating an example of a data table existing in a program memory.

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

FIG. 11 is a flowchart showing an operation of a subroutine “interrupt”.

FIG. 12 is a diagram showing an example of setting parameters relating to film speed control.

FIG. 13 is a view showing a state of movement of a film.

FIG. 14 is a diagram showing an operation of a subroutine “rewind one frame”.

FIG. 15 is a timing chart at the time of an operation of “rewind one frame” and “rewrite”.

FIG. 16 is a diagram showing a setting example of a control parameter of the motor (M1).

FIG. 17 is a timing chart showing an operation of a subroutine “rewrite”.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Microcomputer (microcomputer) 12 Photometry circuit 13 Distance measurement circuit 14 Shutter control mechanism 15 Focus adjustment mechanism 16 Display circuit 17 Storage circuit 18 Release switch (RELSW) 19 Rewind switch (REWSW) 20 Patrone detection switch (PTSW) 21 Power switch ( PWSW 22 Print number setting switch (PQSW) 23 Rewrite switch (RWSW) 24 Magnetic head 25 Film 25a Perforation 25b Exposure area 25c Recording area 26 Photoreflector (PR) 27 Photointerrupter (PI) 28 Disk with slit 29 Film cartridge 30 Bar code 31 Photoreflector (PR) 32 Signal processing circuit 33 Drive circuit 34 Film feeding mechanism 35 Clock circuit 36 Communication circuit 37 External control Device 38 Temperature measurement circuit 41 Film winding / rewinding motor (M1) 42 Pinion gear 43 Sun gear 44 Planetary gear 45 Gear arm 46 Take-up spool 47 Spool gear 48 Film holding plate 48a Spring 49 Idle gear 50, 51, 52 Gear 53 Coupler gear 55 Coupler 57 feed spool 58 film delivery motor (M2) 59 pinion gear 60 sun gear 61 planetary gear 62 gear arm 63 spring 64 opening 65 pad 66 leaf spring 67 roller member

Claims (3)

[Claims] 1. A first detecting means for detecting perforation of a film, a second detecting means for detecting a movement of the film, and information to be recorded in a magnetic recording area on the film, and An information holding means capable of changing the recording information in accordance with the instruction of the above; and if the information holding means is changed, after rewinding one or more frames of the film based on the output of the first and second detecting means, Positioning means for determining a recording start position by winding up by a fixed amount, and magnetic recording means for magnetically recording the information of the information holding means on the film when the film reaches the recording start position. Magnetic recording rewritable camera. 2. The rewritable magnetic recording according to claim 1, wherein the position determining means determines the recording start position based on a perforation of a photographing frame one frame before the film rewinding direction as a reference position. camera. 3. A film winding operation is started after the photographing operation is completed, and the film winding operation is terminated in response to an output of a first detecting means for detecting a perforation defining a photographing frame, and is linked with the film winding operation. Then, based on the output of the second detecting means that generates a pulse signal with a predetermined resolution as the film moves, the timing of starting magnetic recording on the magnetic recording area provided on the film is determined. A rewritable magnetic recording camera characterized in that information recorded in a recording area can be re-recorded in order to change the information.