JPH03251834A - Magnetic recording device for camera - Google Patents

Abstract

PURPOSE:To perform proper photography by pressing a magnetic head against the surface of a film continuously even after the film travels by one frame if continuous photography is judged, and moving the magnetic head away from the film surface after a picture of one frame is taken at the time of one-frame photography. CONSTITUTION:When the continuous photography is performed, the photography is carried out while the magnetic head 10 is pressed against the surface of the film 2 without being moved away from the film surface every time the film is fed by one frame, and consequently the magnetic head 10 is pressed against and moved away from the surface of the film 2 repeatedly in a short time to eliminate trouble such as the unstableness of the position of the film 2 and a shift in focus position. Then the film 2 is fed intermittently by frames in the film passage 4 consisting of an aperture 3 and a pressure plate 6 on a camera main body side and when the film 2 is wound, the magnetic head 10 records exposure conditions, trimming information, etc. Further, the film 2 is prevented from deflecting by holding the head 10 in a stand-by state at the time of one-frame photography. Thus, the flatness of the film 2 is maintained and focusing on a photography expected surface is securely performed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention involves pressing a magnetic head for magnetic recording onto a magnetic recording medium in which various photographic information such as exposure conditions is formed on the film surface using a magnetic material, while the film is running. Regarding the magnetic recording device in a still camera, which magnetically records the magnetic head by holding the magnetic head in a position retracted from the film surface during normal single-frame shooting, and during continuous shooting (continuous shooting) when shooting multiple frames in succession, ) relates to a drive mechanism for a magnetic head that is controlled to maintain a state in which it is in pressure contact with a film surface.

[Conventional technology]

For example, in a cine camera such as an 8 mm camera, it is common practice to magnetically record ambient sounds and the like during photographing. In such cine cameras, due to the device configuration, such as the fact that it is a moving image and the mechanical arrangement conditions of the image capturing section and the audio recording section that correspond to the shooting optical system, the image capturing part on the film and the image are The corresponding recording portion is located apart in the film running direction. Therefore, in a cine camera, image capture on the film screen and magnetic recording can be considered separately, the arrangement of each part is relatively simple, and there is no mutual interference between both mechanical parts. There is no need to take any consideration to this, and stable image capture and audio recording can be performed on film.

By the way, it is conceivable to apply such a method of magnetically recording information on film to still cameras and the like. In this case, the information to be recorded includes photographic information such as exposure, aperture, film sensitivity conditions, date and time of photographing, and trimming information when printing the photographed screen.

Then, if this information is recorded on the film surface at the time of shooting, this information can be read at a photofinishing laboratory, etc., and the exposure conditions at the time of printing can be set according to the conditions at the time of shooting. You can use a telephoto lens to improve the quality of printed photos, or to take pictures with the premise of enlarging a part of the screen in advance, even if the focal length of the camera's photographic lens is limited. It becomes possible to obtain printed photographs similar to those used in the present invention, and it becomes possible to assist the photographing function.

For this reason, in this type of still camera as well, a magnetic material is provided on the film surface as a magnetic information recording section, and
It is conceivable that a magnetic recording device using a magnetic head or the like for magnetically recording information on the magnetic material be attached to the camera, for example, a configuration as shown in U.S. Pat. No. 4,860,037, etc. Cameras have been proposed in the past.

[Problem to be solved by the invention]

However, in the magnetic recording device of such a still camera, by pressing the magnetic head for recording magnetic information against the magnetic material on the film surface, the flatness of the film, especially in the area of the screen to be photographed, is impaired. There is a risk that such adverse effects may occur, such as being exposed to water, and it is necessary to take some measures to prevent such problems from occurring.

In other words, with a still camera, there is not enough space to separate the image capturing section and audio recording section like in a cine camera (also, after development and printing are completed, it is necessary to separate the image capturing section and the audio recording section). Since the film is generally cut to length, it is important to record the various types of information mentioned above on or near the side edges of the film as close to the photographic screen as possible, so that the handling of the film pieces and the camera will be easier. This is advantageous in terms of space for installing mechanical parts within the camera, as well as in making the camera more compact.For this reason, the magnetic information recording section is placed close to the film's shooting schedule screen, and this It is conceivable to provide a magnetic head for recording information in the magnetic information recording section so as to be pressed against the film surface in a direction perpendicular to the film surface at a portion close to the film path facing the aperture of the camera body.

However, in this way, placing a magnetic material for recording magnetic information close to the scheduled shooting screen on the film surface means that
A new problem that does not occur with the above-mentioned cine cameras is that the pressure contact force of the magnetic head for recording magnetic information is held between the aperture on the camera body side and the pressure plate on the back cover side during shooting. The external force exerts a negative influence on the film, causing the film surface to bend or distort.
It becomes difficult to maintain the flatness of the surface, and a new problem arises in that the focusing position on this surface becomes misaligned. Therefore, according to a still camera, some kind of countermeasure can be taken to record magnetic information to minimize the negative effect of the magnetic head on focusing in the area of the screen where the film is scheduled to be shot, which did not require any consideration at all in the above-mentioned cine camera. It is necessary to take the following measures.

[Means to solve the problem]

In order to meet such demands, the magnetic recording device of the camera according to the present invention is arranged so that it can move forward and backward in a direction perpendicular to the film surface at a portion of the camera body close to the aperture, and is arranged to move forward and backward in the direction perpendicular to the film surface. A magnetic head for magnetic recording that records information magnetically, and a magnetic head drive that holds this magnetic head in a position away from the film surface and presses it against the film surface when the film is running after shooting. a means for determining whether one-frame shooting or continuous shooting is being performed; and, when the determining means determines that continuous shooting is being performed, the magnetic head is maintained in a pressed state against the film surface even after the film has traveled for one frame. On the other hand, when it is determined that one-frame photography is being carried out, the apparatus is configured to include means for controlling the magnetic head driving means so that the magnetic head is retracted from the film surface after the film has traveled for one frame.

[Effect]

According to the present invention, the magnetic head is brought into pressure contact with the film surface while the film is traveling during winding operation to record the required magnetic information, and the normal single frame recording is performed by a means for determining whether single frame shooting or continuous shooting is being performed. When it is determined that shooting is being performed, the magnetic head is held in a retracted position so as not to come into contact with the film surface, and when it is determined that continuous shooting is being performed, the magnetic head is held in a retracted position so as not to come into contact with the film surface. , without retracting the magnetic head.
It maintains the state in which it is pressed against the film surface.

〔Example〕

1 to 4 show an embodiment of a magnetic recording device for a camera according to the present invention. In these figures,
Reference numeral 1 denotes a film cartridge containing a film 2 wound therein, and on the surface of the film 2 there is a well-known shooting schedule screen, which is a recording medium for optically recording information by shooting, and a screen below it. A magnetic information recording section (both not shown) made of a magnetic material is formed close to the edge portion, etc., and serves as a recording medium for magnetically recording various photographic information. The cartridge 1 as described above is loaded into a camera body (not shown) constituting a still camera, and the film 2 pulled out from the cartridge 1 is inserted into the aperture 3 of the camera body (see FIGS. 1 and 2). The film passes through the film passage 4 (see Fig. 4) facing the sea urchin (indicated by the dotted chain line in Fig. 2), and is sequentially wound onto the film winding spool (not shown) provided at the other end of the camera body. configured to be used. As shown in FIG. 4, the film passage 4 mentioned above is formed by opening in a part of the camera body 5, and directs light incident from a photographing lens system (not shown) to the scheduled photographing screen of the film 2 (after photographing). There is an aperture 3 that guides the film to the camera (which becomes the photographic screen) and determines the photographic screen.
The pressure plate 6 is biased by springs 6a, 6a so as to press the pressure plate 6. Here, the film passage 4 formed between these apertures 3 and the pressure plate 6 is
The film 2 is formed with a margin greater than the thickness of the film 2, so that the film 2 can take a somewhat free shape within this gap. The film 2 cannot maintain a perfectly flat state by itself due to its own curling, etc., and ideally, the central part in the width direction (including the part that will become the screen to be photographed) is in contact with the pressure plate 6. In addition, it is desirable that both end edge portions contact the inner rail portions 7a, 7a (the lower side is not shown) on the camera body 5 side, thereby forming a substantially flat surface. In the figure, 7b and 7b are springs 6a.

An outer rail portion (the lower side is a recess shown in the figure) for locking the pressure plate 6 urged by 6a to the aperture 3 with a predetermined gap,
The film passage 4 is formed in a gap between the pressure plate 6 supported by the outer rail parts 7b, 7b and the inner rail parts 7a, 7a.

In the figure, reference numeral 10 denotes a magnetic head disposed facing the lower edge of the film 2 near the aperture 3 for magnetically recording various photographic information on the film 2, and 11 denotes the magnetic head 10. A magnetic head drive mechanism for advancing and retracting the film from a direction substantially perpendicular to the two sides of the film,
This drive mechanism 11 normally holds the head IO in a position retracted from the second surface of the film as shown in FIG. 1 and FIG. As shown in FIG. 3(b), the film 10 is driven so as to come into pressure contact with two surfaces of the film. When the magnetic head 10 is pressed against the film 2, as shown in FIG. As will be described later, the film is constructed so that magnetic information can be recorded appropriately during film running.

Describing the configuration of the magnetic head drive mechanism 11 in detail, in these figures, reference numeral 12 denotes a magnetic head holding lever rotatably supported by a rotating shaft 13. The head 10 is fixedly held together with its fixing bracket 14. Note that this head 10 has its fixing bracket 14 attached to the lever 12.
The two screws 14ay and 14a are used to fix the position of the inclination and the like so that the position thereof can be adjusted.

The magnetic head holding lever 12 is biased by a tension spring 15 attached to the other end in the counterclockwise direction in the figure, that is, in the direction in which the magnetic head 10 comes into pressure contact with the film 2 surface. Note that 15a and 15b in the figure are springs 15 provided on the lever 12 and at a fixed part inside the camera (not shown).
The hook that is passed is a pin, and its biasing force is head 10.
It is set as appropriate depending on the pressing force on the two sides of the film, the positional relationship of each part, etc.

16 has an engaging rod 16a that selectively engages with the other end of the lever 12.
A plunger such as an electromagnetic solenoid that serves as a magnetic head driving means to drive the magnetic head in a direction where it is retracted away from the rod and maintain it in that state. 16a is held in the protruding state shown in FIG. 1, etc., the lever 12 is prevented from rotating counterclockwise in the drawing, and the head 10 is maintained in the retracted state from the film 2. Furthermore, when energized, the movable iron core inside the plunger 16 is attracted and driven in the direction of the broken line arrow in FIG.
5 is allowed, and the head 10 is rotated so as to come into pressure contact with the two surfaces of the film. Then, the head 10 is moved by such a rotational movement of the lever 12.
The film is brought into pressure contact with the two sides of the film as shown in FIGS. 2 and 3(b), and is maintained in that state. On the other hand, when the power to the plunger 16 is cut off in this state, the engagement rod 16a becomes in a protruding state again due to the urging force of an internal spring, etc., and engages with the lever 12.
2 against the biasing force of the spring 15, and the lever 12 is rotated clockwise in the figure so that the head 10 is retracted from the film surface 2, returning to the state shown in FIG. The structure is as follows.

Next, a drive control circuit for controlling the drive of the magnetic head drive mechanism 11 having the above configuration and its drive control sequence will be described in detail with reference to FIGS. 5 and 6.

That is, FIG. 5 is a circuit block diagram for driving the magnetic head drive mechanism 11, in which 30 is a microcomputer (hereinafter referred to as CPU), 31 is a battery for power supply, and 32 is a circuit for detecting the film 2. This is a film detection switch that is turned on when the film path 4 is turned on, and is configured to be operated in conjunction with a film detection member (not shown) provided facing a part of the film path 4, for example. Note that this switch 32 has one end grounded, the other end connected to the input port 11 of the CPU 30, and connected to the battery 31 via a pull-up resistor 32a.
It is connected to the.

33 is a release switch that is turned on in conjunction with the pressing operation of a release button (not shown); one end of this switch 33 is grounded, the other end is connected to the input capacitor (I2) of the CPU 30, and is connected to a pull-up resistor. It is connected to the battery 31 via 33a. Note that the operation of turning on the release switch 33 will be referred to as a release operation in the following explanation, and it is well known that a photographing operation is started by this operation.

Reference numeral 34 denotes an exposure control device such as a shutter, an aperture, or an aperture control device, and is configured to control the shutter speed and aperture according to commands from the CPU 30 to perform desired photography.

A film winding device 35 is composed of a motor, a gear train, a sprocket, a spool, etc., and controls the winding start and winding stop operations of the film 2 according to commands from the CPU 30.

Reference numeral 36 denotes a film movement amount detection device consisting of a sprocket, rollers, etc. for detecting the amount of travel of the film 2, and is configured to output a detection signal to the CPU 30 when the amount of winding and travel for one frame of the film 2 is detected. ing.

Further, as shown in FIG. 5, the magnetic head 10 has a C
The circuit is connected so that the output information of the PU 30 is magnetically recorded on the film 2. It goes without saying that the configuration may be such that information magnetically recorded on the film 2 side can be input to the CPU 30.

Furthermore, a plunger 16 which is the magnetic head driving means
is also connected to this CPU 30 via a transistor 37, and when this transistor 37 is turned on, the engaging rod 18a, which operates integrally with the movable iron core in the plunger 16, is activated by being energized as shown in FIG. By performing a retracting operation as shown by the arrow in the middle dashed line, the state shown in FIG. 2 is achieved, and conversely, by turning off the transistor 37, a protruding operation occurs in the direction shown by the arrow in the dashed line in FIG. 2. The state shown in FIG. 1 is reached. Note that the transistor 37
The base of is connected to the output port 01 of the CPU 30,
The collector of the transistor 37 is connected to the battery 31 and the emitter is connected to the plunger 16. And C
When the output port 01 of PU30 becomes high level,
Transistor 37 is turned on.

In the above configuration, when the battery 31 is loaded into the camera, the program starts, and as is clear from FIG. 6, the presence or absence of the film 2 is determined by turning on and off the film detection switch 32 (step 101). If there is no film 2, the process remains in step 101, and if film 2 is confirmed, the process proceeds to step 102.

Further, in step 102, it is determined whether or not a release operation is being performed by turning the release switch 33 on and off. If the release operation is not performed, the process returns to step 101 and the release switch 3
3 is turned on and it is determined that a release operation is being performed, the process proceeds to step 103.

In this step 103, various parameters necessary for exposure calculation, such as subject brightness from a photometer (not shown) and film sensitivity from a film sensitivity setting device (not shown), are taken in, so that shutter speed and aperture are input. An exposure value such as a value is calculated, and the exposure control device 34 is controlled to this value to perform a photographing operation.

Furthermore, following this exposure control during photographing, step 104
The plunger 16 is energized, and the magnetic head 1
The drive control is performed so that the film 0 is brought into pressure contact with the two surfaces of the film from the state shown in FIG. 1 as shown in FIG.

Next, in step 105, a command signal is output to the film winding device 35 to start winding the film 2, and in step 106, an information signal is output to the head 10, and information is magnetically recorded on the running film 2. (Or magnetic recording may be read).

Then, in step 107, the movement amount detection device 36 determines whether or not the film 2 has been fed by the amount of travel for one frame, and magnetic information recording is performed until the amount of travel for one frame is reached. When it is determined that this has been reached, the process proceeds to the next step 108.

In step 108, a command is given to the film winding device 35 to stop the winding operation, and the film 2 is stopped.

Then, in this state, in step 109, it is determined whether the release switch 33 is on, that is, whether or not continuous shooting is required. The switch 33
is on, a release operation is being performed, and it is determined that continuous shooting is in progress, the process returns to step 103 and exposure control is performed, followed by steps 104 to 109.
Repeat the steps up to. On the other hand, when the switch 33 is in the OFF state with no release operation being performed, it is determined that continuous shooting is not being performed (that is, normal single-frame shooting is being performed), and the power to the plunger 16 is cut off in step 110. , the magnetic head 10 changes from the pressure-contact state shown in FIG.
The process returns to the saved state shown in the figure and returns to step 101.

That is, according to the present invention, during the shooting operation described in the above-described embodiment, after the film winding operation for one frame has been stopped, it is determined whether or not the release button is pressed down, and the release operation is performed. When this condition is confirmed and it is determined that continuous shooting is in progress, the magnetic head 10 is kept in pressure contact with the two sides of the film even during shooting, unlike when shooting a single frame. The structure is such that it is maintained.

With such a configuration, during continuous shooting (continuous shooting), the magnetic head 10 presses against and retreats from the film 2 surface in a short period of time, causing the film 2 to
It is possible to prevent problems in which the position of the lens becomes unstable and the focus position is likely to shift, and the advantage thereof is obvious.

Therefore, with such a configuration, the magnetic recording section and the film 2 that are intermittently fed frame by frame through the film path 4, which is composed of the aperture 3 and the pressure plate 6 on the camera body side, are located in the vicinity of the photographing screen. The magnetic head 10 magnetically records exposure conditions, trimming information, etc. during winding of the film 2, and also records information such as exposure conditions and trimming information on the scheduled shooting screen of the film 2, which may occur due to bending of the film 2 due to this magnetic recording section. By keeping the magnetic head 10 in a retracted state during normal single-frame shooting, the negative effects such as deflection and distortion of the film 2 can be avoided, ensuring the flatness of the film 2 and ensuring that the film 2 is focused on the scheduled shooting screen. to take appropriate photographs.

On the other hand, during continuous shooting, the magnetic head 10 is not retracted every time the frame is advanced, but the magnetic head 10 is kept in pressure contact with the two sides of the film during shooting.
By repeating the pressing and retracting operations of the film 2 on the film 2 surface, it is possible to prevent problems such as instability of the film 2 position and deviation of the focus position, which are likely to cause problems, and to take appropriate photographs.

Further, the drive control circuit for controlling the drive of the magnetic head drive mechanism 11 described above and its drive control order are as follows:
A second embodiment as shown in FIGS. 7 and 8 is also conceivable. Here, in these figures, the same or corresponding parts as in FIGS. 1 to 6 described above are given the same numbers, and detailed explanations will be omitted.

FIG. 7 shows only the changed part in the block diagram of FIG. 5 showing the above-mentioned embodiment, and C
Only the input capacitor (I3) is added to a part of the PU. 4
0 is a drive mode switching dial, and by aligning the pointer 40a with the index S or index C shown on the camera body, the drive mode switch 41 is turned on and off, and the CP
The mode switching state can be input to U30.

That is, one end of the drive mode switch 41 is grounded, and the other end is pulled up to the power supply by a pull-up resistor 41a and connected to the input port I3 of the CPU 30. The drive mode switch 41 is turned on or off by rotating the drive mode switching dial 40, thereby allowing the CPU 30 to set the setting position (S or C) of the drive mode switching dial 40, that is, the drive mode. Note that S indicates single-frame shooting mode, and C indicates continuous shooting mode.

FIG. 8 is a flowchart for explaining the drive control operation of the magnetic head drive mechanism 11 equipped with such drive mode switching means. To explain this simply, when the parts teller 31 is loaded into the camera, the main program starts and, as is clear from FIG. (step 201). Here, flag H
is "1" when the magnetic head 10 is in pressure contact with the film surface of the film 2, and becomes "0" when the magnetic head 1O is not in pressure contact with the film surface of the film 2. This is to show the state of the head 10.

After the above-mentioned initial reset is performed, FIG.
As is clear from a), in step 202, the presence or absence of the film 2 is determined by turning on and off the film detection switch 32. And if there is no film 2, step 20
2, and if film 2 is confirmed, step 203
Proceed to. Further, in this step 203, the drive mode is determined by turning on/off the drive mode switch 41, and when the continuous shooting mode is "C", the process proceeds to step 204.
Step 205 when in single-frame shooting mode rSJ
Step 3 sets flag F to "1" or "0", respectively. This flag F is set to "
When the flag is set to "1", and when the flag is set to "0" in the single-frame shooting mode, it is a flag indicating the drive mode.

Next, in step 206, the measured time is determined, and T is a predetermined time of 8 degrees, for example, to prevent the head 10 from being pressed against the film surface of the film 2 for a long time after shooting. This is the set time, and is preferably about 1 minute or less. Then, when t>T, proceed to the next step 207, and when t≦T, proceed to step 2, which will be described later.
Proceed to step 12.

In step 207, a release routine 213 to be described later is performed.
The time measurement started in step 260 is stopped, and the time measurement t is reset to "0" in step 208.

Next, in step 209, the magnetic head 10 is
If H=1 and the magnetic head 10 is in pressure contact, the process proceeds to step 210, and the plunger 16
By cutting off the power to the magnetic head 10, the magnetic head 10 is returned from the pressed state to the retracted state. And this magnetic head 1
In step 211, the flag H is set to rOJ according to the state of 0.
and proceeds to step 212.

That is, as is clear from these steps 206 to 211, when the measured time t is less than or equal to the predetermined time T,
The clock is not stopped and the magnetic head 10 is not retracted. On the other hand, if the clocked time t becomes longer than the predetermined time T, the clock is stopped, the clocked time t is reset to O, and the magnetic head 10
If it is in pressure contact with the surface of the film 2, control is performed to return it to the retracted state.

After that, it is determined whether or not a release operation is being performed by turning on and off the release switch 33, and if the release switch 33 is turned on, step 21 is performed.
If the release routine is off, the process returns to step 202, and the subsequent step operations are repeated.

Here, this release routine 213 is shown in FIG. 8(b).
will be explained in detail using First, various parameters necessary for exposure calculation, such as subject brightness from a photometer (not shown) and film sensitivity from a film sensitivity setting device (not shown) are input, and exposure values such as shutter speed and aperture value are calculated. A photographing operation is performed by controlling the exposure control device 34 so that this value is achieved (step 251).

Then, in step 252, the magnetic head 1 according to the flag H is
0 state is determined, and when H=1, in which the magnetic head IO is in pressure contact with the film surface, step 2, which will be described later, is performed.
55, when the magnetic head 10 with H=0 is in the retracted position and in a non-pressure contact state, the plunger 16 is energized in step 253, and the magnetic head 10 advances to the state shown in FIG. Then, drive control is performed so as to bring the magnetic head 10 into pressure contact with the surface of the film 2 shown in FIG.

That is, if the magnetic head 10 is not in pressure contact with the film surface, it is controlled to be in pressure contact with the film surface.

When the magnetic head 10 is in pressure contact with the film surface as described above, a command signal is output to the film winding device 35 in step 255 to start winding the film 2, and a necessary information signal is output in step 256. magnetic head 1
0 and perform magnetic information recording on the running film surface (or magnetic recording may be read)
.

Then, in step 257, it is determined by the movement amount detection bag W136 whether or not the film 2 has been fed by the amount of travel for one frame, and until the amount of travel for one frame is reached, information is magnetically recorded, and When it is determined that the goal has been reached,
Proceeding to the next step 258, a command is given to the film winding device 35 to stop the winding operation, and the film 2 is stopped.

Thereafter, in step 259, it is determined whether or not the measured time t is 1=0, and if t=0, step 26
A detour is made to step L 262 to stop timing and reset the clocked time t to 0 before proceeding to step 260. Further, when it is determined in step 259 that the clocked time 1=0, the process directly advances to step 260,
Start timing.

Then, in step 263, the drive mode is determined based on the flag F, and when it is the C mode where F=1, the process returns to the main program shown in FIG. 8(a) described above.
Also, if the S mode is F=O, step 26
4, the power to the plunger 16 is cut off, and the magnetic head 10 is returned from the press-contact state shown in FIG. 2 to the retracted state shown in FIG. 1. When the magnetic head 10 reaches the retracted position, the flag H is reset to O in accordance with this state.

Next, in step 266, it is determined by turning off the release switch 33 whether or not the release button (not shown) is no longer pressed and the release operation is released. The process remains at step 266 until it is determined that it is off, and when it is determined that it is off, it returns to the main program. That is, when the camera is in the single-frame shooting mode (S mode), it is determined that the release routine is in progress, that is, photography is in progress, until it is determined that the release button (not shown) is released.

In other words, in the C mode, after the winding is stopped and timing is started, the program returns to the main program without retracting the magnetic head 10.

In addition, in the S mode, after the winding is stopped and timing is started, the magnetic head 10 is retracted, and it is determined that the release button has been pressed down, and the process returns to the main program.

That is, in the second embodiment with the drive control operation as described above, in the C mode, the magnetic head 10 is not retracted immediately after film winding is completed, but after a predetermined period of time has elapsed, and in the S mode. Sometimes the magnetic head 10
The drive is controlled so that the retraction is performed immediately after film winding is completed.

FIGS. 9(a) and 9(b) show a third embodiment for controlling the drive of the magnetic head drive mechanism 11, in which the same drive control circuit as in the second embodiment described above is used. explain.

In these figures, the main program shown in FIG. 9(a) will be explained. When the battery 31 is loaded into the camera, in step 301, when the magnetic head 10 is in pressure contact with the film surface, "1" is generated. Then, the flag H indicating the state of the magnetic head 10, which is "0" when it is not pressed, is reset to zero.

After this initial reset is performed, step 30
In step 2, the presence or absence of film 2 is determined by turning on/off the film detection switch 32, and if there is no film 2, step 3
02 and when film 2 is confirmed, step 30
Proceed to step 3. Further, in this step 303, the drive mode is determined by turning on/off the drive mode switch 41, and when the continuous shooting mode rCJ is selected, the process proceeds to step 304, and when the single frame shooting mode rSJ is selected, the process proceeds to step 30.
Step 5 sets the flag F to "1" or "0", respectively. As described above, this flag F is a drive mode that is "1" in the continuous shooting mode and "0" in the single-frame shooting mode.

Next, in step 306, it is determined whether or not a release operation is being performed by turning on and off the release switch 33. If the release switch 33 is turned on, the process proceeds to step 307, release routine B; In some cases, the process returns to step 302 described above and the subsequent step operations are repeated.

Here, this release routine B507 is shown in FIG.
).

First, various parameters necessary for exposure calculation, such as subject brightness from a photometer (not shown) and film sensitivity from a film sensitivity setting device (not shown) are input, and exposure values such as shutter speed and aperture value are calculated. The photographing operation is performed by controlling the exposure control device 34 so that this value is achieved (
Step 351).

Then, in step 352, the magnetic head 1 according to the flag H is
0 state is determined, and when H=1, in which the magnetic head 10 is in pressure contact with the film surface, step 3, which will be described later, is performed.
The process proceeds to step 55, but when the magnetic head 10, which is H2O, is retracted and is in a non-pressure contact state, the plunger 16 is energized in step 353, and the magnetic head 10 advances.
Drive control is performed such that the state shown in FIG. 1 changes to the state of pressure contact with the surface of the film 2 shown in FIG. ” is set.

That is, when the magnetic head 10 is not in pressure contact with the film surface, drive control is performed so as to bring it into pressure contact.

When the magnetic head 10 is in pressure contact with the film surface as described above, a command signal is output to the film winding device 35 in step 355 to start winding the film 2, and a necessary information signal is output in step 356. magnetic head 1
0 and perform magnetic information recording on the running film surface (or magnetic recording may be read)
.

Then, in step 357, the movement amount detection device 36 determines whether or not the film 2 has been fed by the amount of travel for one frame, and magnetic information recording is performed until the amount of travel for one frame is reached. When it is determined that this has been reached, the process proceeds to the next step 358, where a command is given to the film winding device 35 to stop the winding operation, and the film 2 is stopped.

Thereafter, in step 359, the drive mode is determined based on the flag F, and when F=1 (C mode), the process proceeds to step 360 to determine whether the release switch 33 is on or not, that is, after winding is completed, the release switch 33 is turned on. It is determined whether or not the shutter is turned on and a release operation is performed to take continuous pictures.

Then, when the release switch 33 is on, that is, continuous shooting, the process returns to step 351, and the subsequent steps are repeated, and when the release switch 33 is off, that is, continuous shooting is not being performed, the process proceeds to the next step 361.

In this step 361, the power to the plunger 16 is cut off, and the magnetic head 10 is changed from the pressure-contact state shown in FIG.
Return to the evacuation state shown in the figure.

Then, the flag H is set according to the state of the magnetic head 10.
is reset to O and returns to the main program in step 362L of FIG. 9(a).

On the other hand, it is determined that F=0 according to the drive mode determined by the flag F in step 359, and when it is in the S mode, the process proceeds to step 363, where the power to the plunger 16 is cut off and the magnetic head 10 is changed from the state shown in FIG. 2 to the state shown in FIG. The state is returned to the saved state, and the flag H is reset to O in step 364 in accordance with this state.

Then, in step 365, it is determined by turning off the release switch 33 whether or not the release button (not shown) is no longer pressed and the release operation is released. This step 365 remains until it is determined that it is off, and when it is determined that it is off, it returns to the main program. That is, when the camera is in the single-frame shooting mode (S mode), it is determined that the release routine is in progress, that is, photography is in progress, until it is determined that the release button (not shown) is released.

In other words, in C mode (continuous shooting), if the release operation is performed after the film winding is stopped, exposure control is performed without retracting the magnetic head 10, and if the release operation is not performed, the magnetic head Evacuate 10.

In addition, when in S mode (single-frame shooting), after stopping winding, the magnetic head 10 must be retracted, and after determining that the release button has been released, that is, the release operation has been released, proceed to the next operation. This prevents continuous shooting.

In the third embodiment using the drive control operation as described above, if the release operation is performed immediately after the winding stops in C mode (continuous shooting), the next shooting is performed without retracting the magnetic head 10. will be held. In addition, this continuous shooting mode (
Even in C mode), if the release operation is not performed immediately after winding, or if the single-frame shooting mode (S mode) is selected, the drive control is performed so that the magnetic head 10 enters the retracted state immediately after winding is stopped.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part may be modified and changed as appropriate. For example, in the first embodiment described above, a case will be described in which the magnetic head 10 is provided on the magnetic head holding lever 12 and is configured to be selectively moved forward and backward toward the two sides of the film using the spring 15 and the plunger 16. However, the present invention is not limited to this, and various magnetic head drive structures are possible. In short, any configuration is sufficient as long as it allows the head to be pressed into contact and retracted in the desired state.

〔Effect of the invention〕

As explained above, according to the magnetic recording device for a camera according to the present invention, the magnetic recording device is disposed in a portion of the camera body close to the aperture so as to be able to move forward and backward from the direction perpendicular to the film surface. A magnetic head that magnetically records information, a magnetic head drive means that holds the magnetic head in a position away from the film surface, and drives the magnetic head so that it comes into pressure contact with the film surface when the film runs after shooting, and A means for determining whether shooting is continuous shooting, and when it is determined by this means that shooting is continuous shooting, the magnetic head is kept in pressure contact with the film surface even after the film has traveled for one frame; Although the structure is simple, the structure includes a means for controlling the magnetic head driving means so that the magnetic head is retracted from the film surface after one frame of the film has been traveled when it is determined that the film has run. During normal single-frame shooting, the head is maintained in a state where it does not come into pressure contact with the film surface, ensuring the flatness of the film's scheduled shooting screen, and eliminating the risk of misalignment of the focus position (this ensures that the film's scheduled shooting screen does not come into contact with the film surface). On the other hand, during continuous shooting (continuous shooting), the head is pressed against the film surface without retracting each frame. By shooting with the head in contact with the film surface and retracting the film surface in a short period of time, you can prevent problems such as instability of the film position and deviation of the focus position, which are more likely to cause problems, and ensure proper adjustment. There are various excellent effects such as being able to take photographs.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a magnetic head drive mechanism showing one embodiment of a magnetic recording device for a camera according to the present invention, FIG. 2 is a schematic perspective view for explaining its operation, and FIGS. b)
4 is a schematic plan view showing the movement of the magnetic head toward and away from the film surface, FIG. 4 is a schematic cross-sectional view showing the film path corresponding to the aperture of the camera, and FIG. 6 is a flowchart for explaining the operation of the device; FIG. 7 is a circuit block diagram showing another embodiment of the present invention; and FIG. 8(a) and (b) are flowcharts for explaining the second embodiment of the drive control of the device of the present invention, and FIGS. 9(a) and (b) are flowcharts for explaining the third embodiment of the drive control of the present invention. It is a flow chart for explanation. 1...Film cartridge, 2...Film, 3...Aperture, 4...Film passage, 8
... Crimping pad, 10 ... Magnetic head for magnetic recording, 11 ... Magnetic head drive mechanism, 12 ... Magnetic head holding lever, 13 ... Support shaft, 15 ... Bow 1 tension spring, 16... plunger (magnetic head driving means), 16a... engaging rod, 30... microcomputer (CPU; control means), 32... film detection switch, 33...Release switch,
34...Exposure control device, 35...Film winding device, 36...Film movement amount detection device, 4o...
... Drive mode switching dial, 41... Drive mode switch.

Claims (1)

[Scope of Claims] A still camera in which a film having a recording medium on which various types of information are recorded optically and magnetically by photographing is loaded into the camera body and used, comprising: A magnetic recording head that is arranged to move forward and backward from the direction perpendicular to the film surface and magnetically records information as the film travels when pressed against the film surface; a magnetic head driving means for holding the magnetic head in a fixed position and driving the magnetic head so as to press the magnetic head against the film surface when the film runs after shooting; a means for determining whether single-frame shooting or continuous shooting is being carried out; When the device determines that continuous shooting is being performed, the magnetic head remains in pressure contact with the film surface even after one frame of the film has finished traveling, while when it is determined that continuous shooting is being performed, the magnetic head continues to press the film for one frame of the film. 1. A magnetic recording device for a camera, comprising means for controlling the magnetic head driving means so that the magnetic head retracts from the film surface after completion of travel.