JP3103798B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a film having a magnetic recording medium, and more particularly to a camera capable of displaying in real time the reproduction output of a magnetic head or the noise level of a magnetic signal reproduction circuit in a predetermined operation mode. About.

[0002]

2. Description of the Related Art In an apparatus for reproducing magnetically recorded information using a magnetic head, it is necessary to accurately evaluate a magnetic information reproduction level and a noise level of a processing circuit, and various techniques have been proposed.

For example, in azimuth adjustment of a magnetic head, it is necessary to monitor a magnetic reproduction signal level in real time.

[0004]

However, in a magnetic reproducing apparatus for a camera, very small electronic components such as a magnetic head are generally used, and high-density mounting is performed.

[0005] Under such circumstances, it is not only difficult to provide a test terminal or the like for monitoring the magnetic reproduction signal, but also in order to ensure the accuracy of the magnetic reproduction signal level monitor, an extra probe or the like is required. It is desired to perform measurement without using a simple member.

The present invention has been made in view of the above technical problem, and provides a camera using a film with a magnetic recording section, which can evaluate a magnetic reproduction signal level in real time and accurately. The purpose is to do.

[0007]

In order to achieve the above object, the present invention provides a camera using a film having a magnetic recording medium and having a plurality of operation modes,
Display means for displaying various information of the camera, driving means for winding or moving the film in the winding direction, and reading means for reading signals recorded on the magnetic recording medium, in a predetermined operation mode, A camera for displaying the output signal level of the reading means on the display means in real time is provided.

According to the camera having the above-described configuration, the magnetic reproducing signal level is accurately displayed on the display means in real time.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a schematic configuration of a camera according to an embodiment of the present invention, which will be described.

In this camera, a central processing unit (CPU) 1 for controlling the components of the camera is provided. The CPU 1 is connected to a photometric circuit 2, a distance measuring circuit 3, a shutter control mechanism 4, and a focus adjustment mechanism 5 having a known configuration. Further, the CPU 1 includes a display circuit 6 for displaying various information such as photographing information and date, a timekeeping circuit 7 for forming date data, and a storage circuit for temporarily storing information for magnetic recording ( (EEPROM) 8 and a magnetic information control circuit 9 for recording and reproducing magnetic information.

A magnetic head 10 connected to the magnetic information control circuit 9 records data from the magnetic information recording / reproducing circuit 9 on a magnetic recording unit on the film 11 with a magnetic recording unit, or records data on the magnetic recording unit on the film. In order to read the signal recorded in the magnetic information recording / reproducing circuit 9. The magnetic head 10 is provided with a gap tilt angle adjusting mechanism (not shown) of the magnetic head described later. The film feeding mechanism 14 is for feeding the film 11 with a magnetic recording section based on a drive control signal from the drive circuit 13.

The CPU is provided with a plurality of switches. When a release switch (REL) 15 is turned on, the CPU 1 performs an exposure operation. The back cover detection switch (BK) 16 is a switch for detecting opening and closing of the back cover. Rewind switch (REW) 17
Is turned on, the CPU 1 causes the film to rewind to the cartridge. The adjustment switch (ADJ) 18 is a switch operated when adjusting the azimuth of the magnetic head. The power switch (PW) 19 is a switch linked to the power supply of the camera, and the camera operates only when the switch is turned on.

FIG. 2 shows a configuration in which the film feeding mechanism is seen through from behind, and will be described. This configuration is a state immediately after the film cartridge is loaded in the camera body. FIG.
Shows the structure of the film cartridge.

A pinion gear 23 is provided on the output shaft of a film winding / rewinding motor 21 (M1) provided on the main body of the camera, and the pinion gear 23 meshes with a sun gear 24. Further, this sun gear 24
The planetary gear 25 meshes with the planetary gear 25, and the planetary gear 25 is supported via a gear arm 26 so as to revolve around the rotation axis of the sun gear 24.

A take-up spool 27 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, and an upper end surface of the take-up spool 27 is provided. Is provided integrally with a spool gear 27a that meshes with the planetary gear 25 when the planetary gear 25 revolves counterclockwise.

Further, a perforation locking claw 27b that engages with a perforation of a film described later projects from a lower outer peripheral surface of the take-up spool 27.

When the planetary gear 25 revolves clockwise, the idle gear 37 is brought into a position where it meshes with the planetary gear 25.
In this case, the planetary gear 25 is connected to a coupler gear 33 to be described later via idle gears 37, 36, 35, and 32.

On the right side from the back of the camera body,
There is a patrone storage room for storing patrone.
Above this storage chamber, a coupler gear 33 having a coupler 34 whose tip projects in a “-” shape is rotatably provided. As shown in FIG. 3, the coupler 34 fits into a groove provided on the upper end surface of a feed spool 71 provided on the film cartridge 70, and is integrated with the feed spool 71 around the axis.

The camera body has a film feeding motor 2
2 (M2) are provided. A pinion gear 28 is provided on the output shaft of the film delivery motor 22, and the pinion gear 28 meshes with a sun gear 29. Further, the sun gear 29 meshes with a planetary gear 30, and the planetary gear 30 is supported via a gear arm 31 so as to revolve around the rotation axis of the sun gear 29. Since the tension of the spring 41 acts on the gear arm 31, the planetary gear 30 and the idle gear 32 mesh only when the film feed motor 22 (M2) rotates counterclockwise.

The photo reflector 39 is provided for detecting the perforation of the film. The magnetic head 20 is provided for reproducing data from a magnetic track of the film and for recording data on the magnetic track.

FIG. 4A shows a conceptual configuration of a mechanism for adjusting the gap inclination angle of the magnetic head with respect to the running direction of the magnetic band-equipped film mounted in this embodiment. FIG. 2B shows a front view near the magnetic head, and FIG. 2C shows a top view of the head pointing member.

The substrate 54a of the gap tilt angle adjusting mechanism
, A spring 56 and an actuator 55 such as a solenoid are arranged on the opposite side of the magnetic head 62 about the support shaft 57.
The magnetic head 62 is brought into contact with the magnetic band-attached film 53 by the pulling force of the spring 56, and the magnetic head 62 is retracted by the actuator 55.

A head support member 60 is welded to the magnetic head 62. The head support member 60 is attached to the substrate 54a by the support shaft B61 and the eccentric pin 59 so that the magnetic head 62 contacts the magnetic band of the film 52. The head support member 60 urges the eccentric pin 59 about the support shaft B61 by the tension of the spring 58.

By rotating the eccentric pin 59, the inclination of the head gap is adjusted. The eccentric pin 59 is
It has a length that can be adjusted from outside the camera. On the film winding side of the magnetic head 62, a position regulating member 54b in the film vertical direction, which is slightly wider than the film width,
54c are arranged. Furthermore, the pressure pad 63 is opposed to the magnetic head 62 and sandwiches the film 52 with a magnetic band.
Is arranged.

FIG. 5 shows the driving circuit 13 shown in FIG.
And the specific configuration of the magnetic information control circuit 9 will be described.

First, the CPU 1 has D / A converters 65a and 65a used for setting the film moving speed.
5b are provided.

The film moving speed determined by the CPU 1 is converted into an analog signal and converted into an analog signal.
a is output to one input terminal of the differential amplifier 66. The other input terminal of the differential amplifier 66 has f / v
The analog signal output from the converter 67 is input.

The f / v converter 67 receives a clock signal obtained by converting a signal output from the photoreflector 68 by a waveform shaping circuit 69. This clock signal is
Each time the perforation 70 of the film 81 passes in front of the photoreflector 68, it is output from the waveform shaping circuit 69. The frequency of the clock signal is proportional to the moving speed of the film. The clock signal is also output to the CPU 1.

The CPU 1 detects the amount of film movement by counting this clock signal.

Therefore, the differential amplifier 66 is connected to the D /
The difference between the output of the A converter 65 a and the output of the f / v converter 67, that is, an error signal of the film moving speed is output to the comparator 71. The comparator 71 is connected to the differential amplifier 6
The triangular wave oscillator 72 sets the error signal from
, And generates a PWM (pulse width modulation) signal.

Then, the transistor Q1 is generated by the PWM signal.
On / off control. The power output from the battery 73 through this transistor Q1 is
Film winding / rewinding motor (M) through a smoothing circuit A composed of a choke coil 75 and a capacitor 76
1) Transistors Q2, Q3, Q for driving 77
4 and Q5.

The output voltage of the smoothing circuit A is proportional to the on / off ratio of the transistor Q1. And a bridge C composed of transistors Q6, Q7, Q8 and Q9.
Drives the film delivery motor (M2) 78.

The decoder 79 selects one of the bridges B and C based on the motor drive signal from the CPU 1. Then, one of four signals (OFF, brake, CW rotation, CCW rotation) for controlling the motors 77 and 78 is output to the selected bridge.

The reason for adding a function for keeping the film moving speed constant to such a film winding / rewinding motor driving circuit is that when data is recorded on the magnetic track 81a of the film 81, the film 81 moves. If the speed is not constant, the recording density becomes uneven. However, since the film delivery motor drives the film from the patrone to the take-up spool, a function for controlling the moving speed of the film is not required.

The magnetic head 82 is used for recording data on the magnetic track 81a and reproducing data from the magnetic track 81a. Data recorded on the magnetic track 81a is output from DOUT of the CPU 1.

The buffer 83 supplies a current to the magnetic head 81a according to the output signal of the DOUT. The data recording method is a bi-phase recording method. In this recording method, frequencies corresponding to 0 bits of data and 1 bit of data are determined. Here, FIG. 6A shows continuous 0-bit data, and FIG. 6B shows continuous 1-bit data.
Indicates bit data. For example, the 8-bit data “100”
When recording 11101 ″, the CPU 1 outputs an output signal as shown in FIG. 6C from the DOUT terminal.

The magnetized magnetic material is used as the magnetic head 8
When the magnetic head 82 moves before the magnetic head 82, the magnetic flux passing through the magnetic head 82 changes, and the magnetic head 82 generates a signal corresponding to the data recorded on the magnetic material. This signal is amplified by the head amplifier 84 and input to the reproducing circuit 85. Reproduction circuit 85
Reproduces data from the signal of the head amplifier 84 and
Output to U1.

The output signal of the head amplifier 84 is output to a signal terminal 89 that can be contacted from outside the camera. This terminal 89 is used to adjust the magnetic head 8 during azimuth adjustment.
2 can be used to monitor the reproduced signal. The output signal of the head amplifier 84 is shaped into a waveform by the envelope detection circuit 86, and the A / D converter 65 of the CPU 1
b.

The buffer 87 drives a solenoid 88 used when the magnetic head 82 is retracted.

Next, the operation of the camera thus configured will be described with reference to the main flowchart of FIG. Here, the reference numerals of the constituent members use the reference numerals shown in FIGS. 1 to 5.

First, when the power switch (PW) is turned on, the CPU 1 resets the power ON. And I
The initialization of the initialization memory of the / O port is executed (step S1).

Next, the on / off state of the BK switch 16 is determined (step S2). The BK switch is activated by the user loading the film and closing the back cover.
Switches from off to on. When this switching (rising) is detected (YES), a subroutine "idling" is executed (step S3).

In the idle feed subroutine of step S3, the film 40 is pulled out of the cartridge 39 and wound around the take-up spool 27 by a predetermined amount. However, when the switching of the BK switch is not detected (NO), the rewind switch (REW) 17 is turned on / off.
An off state is determined (step S4).

In this determination, the rewind switch 17
Is turned on, a subroutine "rewind" is executed (step S5). In this rewind subroutine, the film 40 on the take-up spool 27 is
9 is performed. However, when the wind switch 17 is off (NO), the on / off state of the ADJ 18 switch is determined (step S6).

When the ADJ switch is turned on in the determination in step S6 (YES), a subroutine "azimuth" which is an operation necessary for adjustment is executed (step S6).
7). However, when the ADJ switch 18 is off (NO), the on / off state of the PW switch 19 is determined (step S8).

If it is determined in step S7 that the PW switch 19 is off (NO), the operation of the camera is prohibited and the operation of the CPU is stopped. However, when the PW switch 19 is on (YES), the photometric circuit 2
Is performed (step S9). Based on the data from the photometric circuit 2, the shutter speed and the shutter speed are calculated.

Next, photometric data, the number of frames to be photographed, and the like are displayed using the display circuit 6 (step S10), and the on / off state of the release switch (REL) 15 is determined (step S11). With this determination, the release switch 15
If is turned off (NO), the process moves to step S2 and returns to the beginning of the main routine. However, when the release switch 15 is on (YES), the subject distance is calculated based on the data from the distance measurement circuit 3 (step S12). The CPU 1 controls the focus adjustment mechanism 5 to focus on the subject. And step S
Based on the shutter speed and the shutter speed calculated in step 9,
The exposure is controlled by controlling the shutter control mechanism 4 (step S1).
3).

After the exposure of the film is completed, the film is wound up by one frame (step S14). At the time of this winding, the film counter FCo is incremented,
The photographing data is stored in the storage circuit 8.

Next, with reference to the flowchart of FIG. 8, the above-described subroutine "idling" will be described.

First, an actuator 55 such as a solenoid
A current is caused to flow (step S21), and a gap is created between the pressure bonding pad 63 and the magnetic head 62. The magnetic head 62
Is pressed against the crimping pad 63 by the tension of the spring 56.

Therefore, in this pressed state, the film 52 cannot pass through, and the actuator 55 is energized to form a gap.

Next, the clock counter (CL) of the CPU 1
K) to count the clock signal input to
CLK is initialized to "0" (step S2)
2).

The counting operation of the counter (count U
P) is started (step S23). The clock signal is generated each time the perforation 70 passes in front of the photoreflector 68. Therefore, the movement amount of the film can be detected by counting the clock signal.

Next, the film feeding motor is rotated counterclockwise (step S24). As a result, the coupler 42 of the film cartridge 39 rotates, the film is wound, and moves toward the spool. Then, it waits until the value of the counter reaches N1 (step S2).
5). The value N1 is a numerical value determined by the positional relationship between the take-up spool and the photoreflector 68. When the value of the counter reaches N1 (YES), it is determined that the leading end of the film has reached the take-up spool.

Next, the motor M2 is braked for a predetermined time (for example, about 100 msec) to stop the movement of the film (steps S26 and S27), and the motor is turned off (step S28).

Then, in preparation for the next operation, the counter is initialized again to start counting (step S29,
S30). Then, the moving speed Vo of the film is set in the D / A converter (step S31). This moving speed Vo is a value suitable for the operation of winding the film around the spool. Then, the film winding / rewinding motor M
1 is rotated clockwise (step S32). As a result, the film is wound on the spool and the value of the counter becomes N.
_It waits until it reaches ₂ (step S33). The value N
₂ indicates the amount of film wound around the spool.

Next, when a predetermined amount of film has been wound (YES), the moving speed of the film is set to "0" (step S34).

Then, in order to stop winding the film, a brake is applied to the motor for a predetermined time (for example, about 100 msec) (steps S35 and S36), and the motor M1 is turned off (step S37).

Thereafter, the current to the actuator 55 (solenoid) is turned off to press the magnetic head 62 against the film (step S38), the film counter FCo is cleared (step S39), and the routine returns.

Next, the above-described subroutine "rewind" will be described with reference to the flowchart of FIG.

First, the moving speed Vo of the film is set in the D / A converter (step S41). Here, the moving speed Vo is determined as Vo, which is the fastest speed within a range that does not interfere with recording data on the magnetic track of the film in conjunction with the operation of rewinding the film to the cartridge.

Next, the film winding / rewinding motor is rotated counterclockwise (step S42), and the film is wound on the cartridge. The counter is cleared in order to count the clock signal input to CLK of the CPU 1 (step S43). Then, the counting operation of the counter (count UP) is started (step S44).

Then, the data corresponding to the film counter FCo is read out from the storage circuit 8, and this data is recorded on the magnetic track of the film (step S45).
It waits until the value of the counter reaches "8" (step S46).

When the value of the counter reaches "8" (YE
S) Since one frame of film has been wound, the film counter FCo is decremented (step S).
47).

Then, the film counter FCo is set to "0".
Is determined (step S48). If it is not "0" (NO), the process returns to step S43 to continue the operation. When the film counter FCo is "0" (YES), the process stands by until there is no clock signal input to CLK (step S4).
9). Here, the state where no clock signal is generated is a state where the film is detached from the spool. If it is determined that no clock signal is generated in this determination (YE
S), and waits for a predetermined time (for example, 500 msec) (step S
50), it is assumed that the film is completely stored in the patrone. Then, the motor M1 is turned off (step S5).
1) Return.

Next, referring to the flowchart of FIG.
The subroutine "azimuth" will be described.

First, "0" is set to the direction flag (step S61). This direction flag is a flag for determining the moving direction of the film, and when the flag is “0”,
The film is driven toward the take-up spool, and when the flag is "1", the film is driven toward the cartridge.

The subroutine "azimuth" is called after the operation of the subroutine "idling" is completed.
Immediately after the azimuth subroutine is called, the film is wrapped around the spool so that it does not come off. Therefore, the first film drive needs to be executed toward the take-up spool.

Then, the value of the counter for counting the clock signal input to CLK of the CPU 1 is cleared (step S62). The counting operation of the counter is started (step S63).

Film moving speed V to D / A converter
_ADJ is set (step S64). The later this V _ADJ is, the more time for adjustment can be secured. Therefore, the moving speed is preferably slower than the moving speed during the film rewinding operation or the moving speed during the single-frame winding operation of the film. It is also important that there is little. However, if the value of the film moving speed V _ADJ is too small, the characteristics of the driving circuit deteriorate, and the fluctuation with respect to the film moving speed increases. That is, if the fluctuation is large, the signal reproduced from the magnetic head also fluctuates, making adjustment difficult.

Therefore, the practical film moving speed V _ADJ
Is determined by the characteristics of the drive circuit, and if the value of the film moving speed V _ADJ is stored in an EEPROM or the like, it can be changed to match the characteristics of each circuit.

Next, the state of the direction flag is determined (step S65). If the direction flag is "0", the film winding / rewinding motor is rotated clockwise (step S).
66) The film is driven toward the take-up spool. However, if the direction flag is "1", the motor is rotated counterclockwise (step S67), and the film is driven toward the cartridge.

In order to prevent the A / D conversion operation from being performed until the moving speed of the film reaches the set film moving speed V _ADJ , a predetermined time (for example, 100 msec) after the motor starts. It waits (step S68).

Next, the value of the AD counter for counting the number of A / D conversions is cleared (step S69), and the register SUMAD is cleared (step S70). The sum of the A / D converted values is stored in the SUMAD.

Then, the reproduction signal from the envelope detection circuit is A / D converted (step S71), and the A / D converted value is converted to SU.
The value is added to the MAD (step S72), and the value of the AD counter is incremented (step S73).

Next, it is determined whether the value of the AD counter has reached a predetermined value N _AD (step S74). The predetermined value N _AD if (YES) in the determination, A / D converted value of the mean from the values of SUMAD and N _AD is calculated (step S7
5) The average value is transferred to the display circuit 6 and displayed (step S76). This display method will be described later. When the display is completed, the process returns to step S69 to obtain the A / D conversion value again. Number of A / D conversions N _AD
Must be determined in consideration of the fluctuation of the moving speed of the film. When the moving speed of the film changes, the signal reproduced by the magnetic head changes in conjunction with the change.

Therefore, the predetermined value _NAD is determined so that this fluctuation can be canceled. When the A / D conversion value is displayed based on the predetermined value N _AD , if the display cycle is too early, a larger value may be used as the predetermined value N _AD .

However, if it is determined in step S74 that the value of the AD counter has not reached the predetermined value N _AD (NO), it is determined whether the value of the counter has reached N _PC (step S77). The counter value N _PC is a numerical value determined from the number of shots of the film. Perforation 8
The length of the film is equivalent to one frame. Therefore, it is sufficient to use 8 × the number of shots as the counter value N _PC .

[0080] In the determination of this step S77, the when the counter value is not N _PC (NO), the operation returns to the step S71 is continued. However, if the counter value is N _PC (YES), set to "0" transition speed of the film (step S78).

Then, the brake is applied to the motor M1 for about 100 msec to stop the film (step S).
79, S80). After the film stops, the ADJ switch 18 is turned off.

Next, the on / off state of the ADJ switch 18 is determined (step S81). ADJ switch 1
If 8 is off (NO), a master film is not required and must be wound on a patrone. Therefore the moving speed of the film is set to V _MAX of the maximum value (step S83), to rotate the motor in the counterclockwise direction (step S84). Therefore, the film is rewound to the patrone.

However, if the determination in step S81 is ON (YES), the direction flag is inverted (step S81).
82), proceed to step S62. By this operation, the moving direction of the film is reversed. That is, AD
While the JSW is on, the film reciprocates.
Then, the reproduced signal is displayed.

After the film has been rewound on the cartridge, it waits until there is no clock signal input to CLK (step S85). The state where the clock signal is not generated indicates that the film has come off the spool.

If the clock signal disappears (YES), it is determined that the film is completely stored in the cartridge by waiting for a predetermined time, for example, 500 msec, and the motor M1 is turned off (step S87). ),
To return.

Next, FIG. 11 shows an example of a display member provided outside the camera, and the display of a reproduced signal obtained by A / D conversion will be described.

First, SEG1 is a segment for displaying the number of frames. The displayed “EXP 19” is 19
This indicates that the frame is being shot.

SEG2 is a segment for displaying the value of the revolution. “FN8.0” indicates that exposure is performed at FNo8.0.

SEG3 is a segment for displaying shutter time. "SS 125" displayed
Indicates that exposure is performed at a shutter time of 1/125 second.

At the time of adjustment, the display is as shown in FIG.

"ADJ" is displayed on SEG1 to notify the adjuster that adjustment is possible. In addition, “AD 196” is displayed in SEG3, and indicates the A / D converted value of the reproduced signal.

FIG. 13 shows an example of a display member provided in the finder. SEG1 is a segment for displaying the value of the shutter speed, and SEG2 is a segment for displaying the shutter speed.

At the time of adjustment, the display is as shown in FIG. Since the playback data is displayed at the bar level, FIG.
, It is easier to detect the maximum value of the reproduced signal.

In this embodiment, the adjustment operation mode is set by the ADJ switch. However, if the camera has many operation switches, the adjustment operation mode may be set by a special switch operation.

The adjustment operation mode may be set by sending a signal from a signal terminal outside the camera to the CPU.

As described above, when the operation mode provided for the adjustment is set, the master film is moved at a constant speed lower than the film speed at the time of normal photographing.
The reproduction signal from the film can be displayed on the display member of the camera.

[0097]

As described above in detail, according to the present invention, in a camera using a film with a magnetic recording portion, an operation mode for displaying a magnetic reproduction signal level in real time is provided in the camera. A camera that can accurately evaluate the image in real time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a camera as an embodiment according to the present invention.

FIG. 2 is a diagram illustrating a configuration in which a film feeding mechanism of the camera as the embodiment is seen through from behind.

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

FIG. 4 is a diagram showing a conceptual configuration of a mechanism for adjusting a gap inclination angle of a magnetic head with respect to a running direction of a magnetic band-equipped film mounted in the embodiment.

FIG. 5 is a diagram showing a specific configuration of a drive circuit and a magnetic information control circuit shown in FIG. 1;

6A is a diagram illustrating an example of continuous 0-bit data, FIG. 6B is a diagram illustrating an example of continuous 1-bit data, and FIG. 6C is a DOUT terminal of the CPU. FIG. 4 is a diagram showing output signals from the STA.

FIG. 7 is a main flowchart showing the operation of the camera of the embodiment.

FIG. 8 is a flowchart showing a subroutine “idle feed” shown in FIG. 7;
It is a flowchart of FIG.

FIG. 9 is a subroutine “rewind” shown in FIG. 7;
It is a flowchart of FIG.

FIG. 10 is a flowchart of a subroutine “azimuth” shown in FIG. 7;

FIG. 11 is a diagram illustrating an example of a display member provided outside the camera of the embodiment.

FIG. 12 is a view showing a display at the time of adjustment on a display member provided outside the camera of the embodiment.

FIG. 13 is a diagram illustrating an example of a display member provided in a viewfinder of the camera according to the present embodiment.

FIG. 14 is a diagram showing a display at the time of adjustment on a display member provided in a viewfinder of the camera according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Central processing unit (CPU) 2 ... Photometry circuit 3 ... Distance measurement circuit 4 ... Shutter control mechanism 5 ... Focus adjustment mechanism 6 ... Display circuit 7 ... Timekeeping circuit 8 ... Storage circuit (EEPROM) 9 ... Magnetic information control circuit 10 ... Magnetic head 11 ... Film with magnetic recording unit 13 ... Drive circuit 14 ... Film feeding mechanism 15 ... Release switch (REL) 16 ... Back cover detection switch (BK) 17 ... Rewind switch (REW) 18 ... Adjust switch (ADJ) 19 ... Power switch (PW).

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hajime Nagata 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (56) References JP-A-3-140935 (JP, A) JP-A Hei 5-313238 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 17/18 G03B 17/24

Claims (1)

(57) [Claims] 1. A camera using a film having a magnetic recording medium and having a plurality of operation modes, a display means for displaying various information of the camera, and a driving means for moving the film in a winding or winding direction. And reading means for reading a signal recorded on the magnetic recording medium, wherein in a predetermined operation mode, the output signal level of the reading means is displayed on the display means in real time. Features camera.