JPH04178637A - Camera using film provided with magnetic storing part - Google Patents

Abstract

PURPOSE:To prevent the action of a camera accompanied with the erroneous writing or readout of information and troubles which occur at the time of post-processing a film by providing a means for discriminating whether or not a pressing member is in a 1st press-contact state at the time of writing or reading out the information by a magnetic head, a head driving controlling means for controlling the driving of the magnetic head and a warning means for warning in the case of discriminating by the discriminating means that the pressing member is not surely in the 1st press- contact state. CONSTITUTION:At first, the power source of a camera is turned on, and a film cartridge is loaded, and then, a pad motor driving circuit 24 is driven so as to normally rotate a pad driving motor 10, then, a pad 4 is brought into press-contact with the film 2. Next, a film feeding driving circuit 17 is driven so as to bring the 1st frame of the film to an aperture position, and the press-contact state of the magnetic head 1 and the magnetic storing part of the film 2 is discriminated by a switch 12, and in the case that the press-contact state is not normal, the motor 19 is reversely rotated so as to retreat the pad 4 and the driving of the magnetic head driving circuit 22 is inhibited, the inaccurate writing of the information is stopped, and furthermore, a warning display circuit 23 is driven so as to warn that the film is in the original state where the information is as it is.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a magnetic head for writing information to or reading information from a magnetic storage section provided on a film, and a pressure contact between the magnetic head and the magnetic storage section of the film. When information is written or read by the pressure contact member and the magnetic head, the suppression member is moved to a first state in which the magnetic head and the magnetic storage portion of the film are brought into pressure contact, and at other times,
The present invention relates to a camera using a film with a magnetic storage section, including a pressing member moving means for moving the magnetic head to a second state in which pressure contact between the magnetic head and the magnetic storage section of the film is released.

(Background of the Invention) In recent years, film having a magnetic storage section is used, and photographic information such as shutter speed, aperture value, year, month and day, cropping magnification, title, etc. is written in this magnetic storage section using a magnetic head.
A camera is proposed in US Pat. No. 4,864,332, etc., in which this photographic information is read out as necessary.

When writing or reading information to or from a film with a magnetic storage section as described above using a magnetic head, in order to do this accurately, the magnetic storage section of the film and the magnetic head must be brought into pressure contact with each other with a certain pressure to ensure that the magnetic head is It is necessary to have a structure that allows contact with the film magnetic storage section. For this purpose, it is necessary to arrange a film pressing member such as a pad at a location facing the magnetic head holding the film. Further, the film pressing member needs to have a structure in which it is retracted from the film in order to prevent it from adversely affecting the flatness of the film during photographing.

From the above, if the film pressure contact member is switched between the state in which it is in pressure contact with the film and the state in which it is not in contact with the film by the camera sequence, it will fail for some reason and the magnetic head will not be able to write or read information on the film. In some cases, the film pressing member may not be able to press the magnetic storage portion of the film and the magnetic head. In such a case, the magnetic head cannot make reliable contact with the magnetic storage portion of the film and can only correctly write or read information.

If the information is not written correctly, when printing the film, the print may not be as desired (because printing is done based on the information), the printing device may have trouble, or the U.S. Patent No. When applied to the following camera proposed in No. 4878f175, it may cause camera malfunction (described later).

The camera proposed in U.S. Patent No. 4,878,075 is that after photographing (exposure), each frame is stored in a corresponding magnetic memory section.
"Exposed" information is written by a magnetic head,
When a frame in the middle of the film is rewound once into the film cartridge and the film cartridge is loaded into the camera again for use, it is detected whether the frame is exposed or unexposed based on the "exposed information", This is to cue the unexposed frame to the aperture so that it can be photographed from the unexposed frame.

In the case of the above-mentioned camera, if the film is rewound in the middle of the film even though the "exposed" information is not written correctly, if the user reloads the film cartridge into the camera, the double 6 In addition, if you load a film that has been accurately recorded to show that it has been exposed up to a certain frame, if the readout is not performed accurately, the exposed frame may be left unused. There is a possibility that an erroneous operation may occur, such as determining whether the image is exposed or not.

Therefore, if accurate reading and writing cannot be performed,
It is necessary to inform the user of this fact.

(Objective of the Invention) The object of the present invention is to solve the above-mentioned problems, and to prevent the writing or reading of erroneous information. It is an object of the present invention to provide a camera using a film with a magnetic storage unit that can prevent the information from being read out from the SV, and can notify the SV that the information cannot be read.

(Features of the Invention) In order to achieve the above object, the present invention provides a first state in which a pressing member reliably presses the magnetic head and the magnetic storage portion of the film when writing or reading information by the magnetic head. a determining means for determining whether or not the material is present, and when it is determined by the determining means that the first state of secure pressure contact is not established;
head drive control means for setting the magnetic head in a non-driving state; and warning means for issuing a warning when it is determined by the determination means that the first state of secure pressure contact is not established; If the pressing member is not in the first state where writing or reading cannot be performed accurately, is it possible to write or read information to or from the magnetic head? -1j, and also to issue a warning.

(Embodiment of the invention) FIGS. 1 to 4 show a first embodiment of the invention.

3 and 4 are plan views showing the film pressing member and its moving means. In these figures, 1 indicates information to the magnetic storage section of the film 2 traveling in the direction of the arrow (see FIG. 3). A magnetic head for recording and reading information from the magnetic head, which is attached to the camera body, base plate, film pressure plate, etc. (not shown). 3 is configured so that its elongated holes 3a, 3b fit into protrusions 9a, 9b provided on the base plate (not shown), and can be slid in the direction of arrow B (see Fig. 3). be. 4 presses the lever 3 onto its protrusion 4
a is rotatably mounted, the pressing member is a bat that moves in conjunction with the lever 3, and the film contact portion 4b,
Among 4c and 4d, the film contact portion 4b has a concave shape;
The film contact portions 4e, 4b, and 4d have a U-shape. Reference numeral 5 denotes a spring, one end of which is attached to a base plate (not shown), and the other end of which is attached to a spring hook portion 30 of the lever 3, which urges the lever 3 upward in FIG. 3. 6 is a protrusion 9C on the base plate (not shown).

The rack lever is constructed such that its elongated holes 6a and 6b are fitted into the rack lever 9d so that it can slide in the direction of arrow B.
In the case of pressing C, engagement with the arm portion 3d of the lever 3 is possible. A worm member 7 is rotatably attached to a base plate (not shown), and is composed of a worm hole portion 7a that engages with the rack portion 6d of the rack lever 6 and a gear portion 7b.

A spur gear 8 meshes with the gear portion 7b of the worm member 7, and is fixed to a rotating shaft of a bat driving motor 10 attached to a base (not shown).

The pad drive motor 10 is capable of forward and reverse rotation, and when it rotates in the forward direction, the rack lever 6 moves upward in FIG.
It is configured to move downward in reverse.

11 is a switch attached to a ground (not shown), and contact piece 1
1a and the contact piece 11b can be brought into contact with the arm 3c of the lever 3, and when the contact piece 1a and the contact piece 11b are electrically connected, rotation of the rack lever 6 of the butt drive motor 10 is prohibited. Become.

12 is a switch and a contact piece attached to a ground (not shown)
,, 2 a can be pressed against the arm 3C of the lever 3,
When the contacts 12a and 1.2b are electrically connected, rotation of the rack lever 6 of the pad drive motor 10 to move it upward is prohibited.

In the above configuration, FIG. 3 first shows the positional relationship of each member when the magnetic head 1 is not driven. In this case, the arm 6c of the rack lever 6 and the arm 3d of the pressing lever 3 are engaged. Therefore, during pressing, the movement of the lever 3 in the upward direction in FIG. At this time, contact pieces 1 ], a and llb are electrically connected, and the rack lever 6 is prohibited from moving further downward in the figure.

In this state, film exposure operations are generally performed.

FIG. 4 shows the positional relationship of each member when information is being written to or read from the magnetic storage section (not shown) of the ROM 2 by the magnetic NUT 1, and the state shown in FIG. 3 is shown. This state is achieved by rotating the bat driving motor 10 in the normal direction.That is, when the bat driving motor 10 rotates in the normal direction, the rack lever 6 moves upward in FIG. 3 via the worm member 7. Since the lever 3 is no longer restricted in position by the rack lever 6, it moves upward according to the biasing force of the spring 5, and the butt 4 rotatably attached to the tip of the lever 3 presses the film 2 against the magnetic head 2. In this state, the contact piece]
, 2a and the contact piece 12b are electrically connected, so the power to the pad drive motor 1o is cut off, the motor 10 stops, and the rack lever 6 stops at the position shown in FIG. 4. ing.

In this state, the film 2 is correctly pressed against the magnetic head, so it is difficult to reliably write and read information to and from the magnetic storage section of the film 2 before IJT. It goes without saying that when writing or reading this information, the film 2 is fed in the direction of the arrow in FIG.

When the writing and reading of the information is completed, the pad drive motor 10 is reversely energized. As a result, the motor 10 rotates in the reverse direction, and the rack lever 6 begins to move downward in FIG. Therefore, upon pressing, the lever 3 also begins to move downward in the figure, resisting the biasing force of the spring 5. Therefore, the pad 4 becomes separated from the second surface of the film. After that, contact piece 1.1
Due to the conduction between the pad drive motor 10 and the contact piece 11b, the power supply to the pad drive motor 10 is cut off, and each member returns to the state shown in FIG. 4.

FIG. 1 shows a circuit block diagram of a camera having the above-mentioned film pressure contact member, where 16 is a control circuit composed of a microcomputer, etc., and controls various operations of the camera, and 17 is a film feeding circuit (not shown). 18 is a film feed drive circuit that drives the motor; 18 is an A/F/E control circuit that controls the focusing of the photographic lens and the operation of the exposure control shutter; 19 is turned on by the first stroke of the release button.
When this switch is turned on, the camera is released. 20 is a switch that is turned on when a film cartridge (not shown) is loaded into the camera, and 21 is a switch that is turned on when the back cover is closed. When both of these switches are turned on, the control circuit 16 is turned on when a film cartridge (not shown) is loaded into the camera. Drive the feeding drive circuit 17,
Start cuing to the first frame of the film.

22 is a magnetic head drive circuit that drives the magnetic head 1 to perform write and read operations; 23 is a display means using an LED, sound, liquid crystal display, etc., and is driven by a signal from a control circuit 16; A warning display circuit, 24 is a bat motor drive circuit for driving the pad drive motor 10, and 25 is a circuit for setting information to be written in the magnetic storage section of the film, such as shutter speed, trimming magnification, etc., by the photographer's operation. This is the write information setting section.

Next, the operation of the control circuit 16 will be explained according to the flowchart shown in FIG.

"Step 101" When the power of the camera is turned on, the operation proceeds to step 102.

"Step 102" By turning on both the film cartridge loading switch 20 and the back cover switch 21,
Assuming that the camera is loaded with a film cartridge, proceed to step 1.03.

"Step 103" The pad motor drive circuit 24 is driven to rotate the pad drive motor 10 in the forward direction, and the pad 4 is pressed against the film 2 as shown in FIG.

"Step 104" The film feeding drive circuit 17 is driven to cue the first frame of the film to the aperture position using a film feeding motor (not shown), thereby performing a so-called film feeding operation.

"Step 105" In this case, the pad drive motor] is actually rotated in the normal direction so that the pad 4 pushes the film 2, and the switch 12 is checked to see if the magnetic head 1 and the magnetic storage part of the film 2 are in pressure contact. It is determined based on the state, and if the pressure welding is performed normally, the process proceeds to step 117. On the other hand, if the pressure contact is not performed normally, that is, if the bat 4 is not pushing the film 2 due to a failure of the bat motor 10 or a catch in the various levers for some reason,
Because the contact between the magnetic head 1 and the magnetic storage portion of the film 2 is unstable, information can only be written accurately. Therefore, in such a case, the process advances to step 106.

Step 106J: Drive the pad motor drive circuit 24 to reverse the pad drive motor 1o, and retract the pad 4 as shown in FIG.

"Step 107" Driving of the magnetic head drive circuit 22 is prohibited to prevent writing of misleading and inaccurate information.

"Step 108" Drives the warning display circuit 23 to inform the user that information such as shutter speed, trimming magnification, title, etc. is not written, and that the information originally contained in the film is left as is. Warning.

"Step 109" Determine the state of switch 19 and turn O
If N, it is assumed that the release has been performed and the process proceeds to step 110.

[Step 1] The OJ A, F/ΔE control circuit 18 is driven to perform photographing operations such as focusing the photographing lens and exposing operations by opening and closing the shutter.

"Step 111" Determine whether there are any remaining frames of film 2 based on the number of releases, etc., and if so, proceed to step 112.
If there is no such information, proceed to step 115.

"Step 112" Winding of one frame of film is started via the film feed drive circuit 17.

"Step 113" Determine whether or not winding of one frame of film 2 is completed, and if it is completed, step 114
Proceed to.

"Step 114" The pad motor drive circuit 24 is driven to rotate the pad drive motor 10 in the forward direction, and the pad 4 is pressed against the film 2 as shown in FIG. Then, the process returns to step 105. If there are no remaining frames of film 2, the process proceeds to step 115 as described above.

"Step 115" Rewinding of the film 2 into a film cartridge (not shown) via the film feed drive circuit 17 is started.

"Step 116" It is determined whether or not the rewinding of the film 2 has been completed, and when the rewinding is completed, the process proceeds to step 130.

If the magnetic head 1 and the magnetic storage portion of the film 2 are normally pressed together in step 105, the process proceeds to step 117 as described above.

"Step 117" The bat motor drive circuit 24 is driven to reverse the bat drive motor 10, and the bat 4 is retracted as shown in FIG.

"Step 118" The writing information manually set via the writing information setting section 25 is read, and the film 2
The information to be written to the magnetic storage unit is stored.

"Step 119" Determine the state of switch 19 and turn O
If N, it is assumed that the release has been performed and the process proceeds to step 120.

``Step 120J: The AF-AE control circuit 18 is driven to perform photographing operations such as focusing the photographing lens and exposing operations by opening and closing the shutter.

"Step 121" The pad motor drive circuit 24 is driven to rotate the pad drive motor 10 in the forward direction, and the pad 4 is pressed against the film 2 as shown in FIG.

"Step 122" Determine whether there are any remaining frames of film 2 based on the number of releases, etc., and if so, step 123
If there is no such information, the process proceeds to step 126.

"Step 123" One frame winding of the film is started via the film feed drive circuit 17.

"Step 124" The magnetic head drive circuit 22 is driven to write information set by the magnetic head 1 and write or read other necessary information.

"Step 125" Determine whether or not winding of one frame of film 2 is completed, and if it is completed, step 105
Return to

If there are no remaining frames of film 2, the process proceeds to step 126 as described above.

"Step 126" Rewinding of the film 2 into a film cartridge (not shown) via the film feed drive circuit 17 is started.

"Step 127" The magnetic head drive circuit 22 is driven to write information set by the magnetic head 1 and to write or read other necessary information. In other words, the information for the last photographed frame is written when the film is rewound.

"Step 128" It is determined whether or not the rewinding of the film 2 has been completed, and when the rewinding is completed, the process proceeds to step 129.

"Step 129" The pad motor drive circuit 24 is driven to reverse the pad drive motor 10, and the pad 4 is retracted as shown in FIG.

“Step 130J ends the series of camera operations.

5 to 7 show a second embodiment of the present invention.

This embodiment has a mechanism in which the magnetic head is movable and brought into pressure contact with the magnetic storage part of the film, and is moved away.The movement of the magnetic head is detected, and the magnetic head drive circuit is accordingly set to either non-drive or drive. It is now possible to issue warnings, etc.

In FIG. 7, 201 is a magnetic head, 202 is a film provided with a magnetic storage section, and 203 is a projection 209a, 209b provided on a base (not shown) with its elongated holes 203a, 203.
3b is fitted and configured to be slidable in the direction of arrow B. The pressing part 204 is a spring, one end of which is attached to a base plate (not shown), and the other end is a spring hook of the pressing part 203.
The lever 203 is attached to the 0 section, and the pressing forces the lever 203 upward in the figure. 205 is a protrusion 209 on the base plate (not shown)
The rack lever is constructed such that its elongated holes 205a and 205b are fitted in c and 209d so that it can slide in the direction of arrow B, and its arm 205c is pressed by the arm 2 of the lever 203.
03d is possible. Reference numeral 206 denotes a worm member (not shown) which is rotatably attached to a base, and is composed of a worm wheel portion 206a that engages with the rack portion 205d of the rack lever 205 and a gear portion 206b. 2
A spur gear 07 meshes with the gear portion 206b of the worm member 206, and is fixed to the rotating shaft of a head moving motor 208 attached to a base (not shown).

Reference numeral 211 denotes a switch (not shown) mounted on the ground, and when pressed, the contact piece 211a can come into contact with the arm 203C of the lever 203, and when the contact piece 211a and the contact piece 211b are electrically connected, the rack of the butt drive motor 208 is removed. Rotation that moves the lever 205 downward is prohibited. 212 is a switch attached to a ground (not shown), and the contact piece 212a is pressed! It can come into contact with the arm 203c of the lever 203, and the contact piece 21
When 2a and 212b are electrically connected, rotation of the head moving motor 208 to move the rack lever 205 upward is prohibited.

213 is a bat attached to the camera body, and 214 is an interlocking lever rotatably attached to the camera body.

The pressing member has a groove portion 214a that slidably fits into the bottle portion 203d of the lever 203. 215 is the magnetic head 2
01 is a fixed mounting plate, 216.217 is a shaft whose one end is fixed to the camera body, and the sleeve 21 of the mounting plate 215 is
5a.

215b is slidably fitted. A holding rod 218 is fixed to the mounting plate 215, and its tip 218a can come into contact with the arm 214b of the interlocking lever 214. 219 is a magnetic head 201. This is a compression spring that presses the mounting plate 215 downward in the figure, that is, toward the surface of the film 202.

In the above configuration, FIG. 7 shows the positional relationship of each member when the magnetic head 1 is not driven. In this case, the arm 205C of the rack lever 205 and the arm 205C of the lever 203 are pressed.
03d, the pressing is restricted from moving the lever 203 upward in FIG. 7, and the holding rod 218
is urged upward in the drawing by the interlocking lever 214, so the mounting plate 215 is positioned upward in the drawing against the urging of the compression spring 219. Therefore, the film 202 and the magnetic head 201 are not in contact with each other, and the flatness of the film 2 is not affected. At this time, the contact piece 211
A and 211b are electrically connected, and the rack lever 205 is prohibited from moving further downward in the figure.

When the head moving motor 208 is rotated in the normal direction from the state shown in FIG. 7, the rack lever 205 moves upward in FIG.
05 is lifted, the spring 204
moves upward according to the urging force of. As a result, the interlocking lever 214 rotates to the left and the position of the tip 218a of the holding rod 218 is released, so that the attachment plate 215. magnetic head 2
01 moves downward in the figure in accordance with the bias of the compression spring 219, and the film 202 and the magnetic head 201 are in pressure contact with each other.

FIG. 5 shows a circuit block diagram of a camera having the film pressing member described above, and the same parts as in FIG. 1 are given the same reference numerals.

In FIG. 5, 26 is a head motor drive circuit that drives the head moving motor 208, and 27 is a control circuit that is comprised of a microcomputer or the like and controls various operations of the camera.

Next, the operation of the control circuit 27 will be explained according to the flowchart of FIG.

"Step 301" When the power of the camera is turned on, the operation proceeds to step 302.

``Stella7'302j When both the film cartridge loading switch 20 and the back cover switch 21 are turned on, it is assumed that a film cartridge is loaded in the camera, and the process proceeds to step 303.

“Step 303” The head motor drive circuit 26 is driven to rotate the head moving motor 208 in the forward direction, and the magnetic head 2014 is pressed against the film 202.

"Step 304" The film feeding drive circuit 17 is driven to cue the first frame of the film at the aperture position by means of a film feeding motor (not shown), thereby performing a so-called film feeding operation.

"Step 305" Here, the magnetic head 201 is actually moved toward the film 20 by the forward rotation of the head moving motor 208.
Press switch 2 to check whether the magnetic head 201 and the magnetic storage section of the film 202 are in pressure contact.
The determination is made based on the state of step 12, and if the pressure welding is performed normally, the process advances to step 317. On the other hand, if the pressure contact is not performed normally, that is, for some reason, the head moving motor 208
The magnetic head 2 may be damaged due to malfunction of the
If the film 202 is not pressed, information cannot be written accurately because the contact between the magnetic head 201 and the magnetic storage portion of the film 202 is unstable. Therefore, in such a case, the process advances to step 306.

"Step 306" The head motor drive circuit 26 is driven to reverse the head movement roller 208, and the pad 4 is retracted as shown in FIG.

"Step 307" Driving of the magnetic head drive circuit 22 is prohibited to prevent writing of misleading and inaccurate information.

"Step 308" Drives the warning display circuit 23 to notify the user that information such as shutter speed, trimming magnification, title, etc. is not written, and that the information originally possessed by the film remains written. Warning.

"Step 309" Determine the state of switch ] 9, and
If N, it is assumed that the release has been performed and the process proceeds to step 310.

[Step 310J The AF-AE control circuit 18 is driven to perform photographing operations such as focusing the photographing lens and exposing operations by opening and closing the shutter.

"Step 311" Determine whether there are any remaining frames of the film 202 based on the number of releases, etc., and if so, proceed to step 3.
If there is no such information, the process proceeds to step 315.

"Step 312" Winding of one frame of film is started via the film feed drive circuit 17.

"Step 313" It is determined whether winding of one frame of the film has been completed, and upon completion, the process proceeds to step 314.

"Step 314" The head motor drive circuit 26 is driven to rotate the head moving motor 208 in the forward direction, and the magnetic head 201 is pressed against the film 202. Then, the process returns to step 305.

If there are no remaining frames of the film 202, the process proceeds to step 315 as described above.

"Step 315" Rewinding of the film 2 into a film cartridge (not shown) via the film feed drive circuit 17 is started.

"Step 316" Determine whether or not rewinding of the film 202 is completed, and if it is completed, step 130
Proceed to.

If the magnetic head 201 and the magnetic storage portion of the film 202 are normally pressed together in step 305, the process proceeds to step 317 as described above.

"Step 317" The head motor drive circuit 26 is driven to reverse the head movement motor 208, and the pad 4 is retracted as shown in FIG.

"Step 318" The writing information set manually via the writing information setting section 25 is read, and the film 2
02 is stored in the magnetic storage unit.

"Step 319" Determine the state of switch 19 and
If N, it is assumed that the release has been performed and the process proceeds to step 320.

"Step 320.I The AF-AE control circuit 18 is driven to perform photographing operations such as focusing the photographing lens and exposing operations by opening and closing the shutter.

"Step 321" The head motor drive circuit 26 is driven to rotate the head moving element 208 in the normal direction, and the magnetic head 201 is pressed against the film 202.

"Step 322" Determine whether there are any remaining frames of the film 202 based on the number of releases, etc., and if so, proceed to step 3.
If there is no such information, the process proceeds to step 326.

"Step 323" One frame winding of the film is started via the film feed drive circuit 17.

"Step 324" The magnetic head drive circuit 22 is driven to write information set by the magnetic head 201 and to write or read other necessary information.

"Step 325" It is determined whether or not winding of one frame of the film 202 is completed, and when it is completed, step 3 is completed.
Return to 05.

If there are no remaining frames of the film 202, the process proceeds to step 326 as described above.

"Step 326" Rewinding of the film 202 into a film cartridge (not shown) via the film feed drive circuit 17 is started.

"Step 327" The magnetic head drive circuit 22 is driven to write information set by the magnetic head 201 and to write or read other necessary information. In other words, the information for the last photographed frame is written when the film is rewound.

"Step 328" Determine whether or not rewinding of the film 202 is completed, and when it is completed, step 329
Proceed to.

"Step 129" The head motor drive circuit 26 is driven to reverse the head movement motor 208, and the magnetic head 201 is retracted as shown in FIG.

“Step 330” Ends the series of camera operations.

According to each of the above embodiments, it is detected whether or not the magnetic storage portion of the film and the magnetic head are securely in pressure contact, and if they are not in secure pressure contact, the drive of the magnetic head drive circuit is stopped. This prevents problems from occurring during subsequent steps on the film, such as printing or reloading after rewinding the film.

In addition, the camera issues a warning at this time, so the user can recognize that it is impossible to write information.

(Effects of the Invention) As explained above, according to the present invention, when writing or reading information by the magnetic head, the pressing member reliably brings the magnetic head and the magnetic storage portion of the film into pressure contact with each other in the first state. a determining means for determining whether or not the material is present, and when it is determined by the determining means that the first state of secure pressure contact is not established;
head drive control means for setting the magnetic head in a non-driving state; and warning means for issuing a warning when it is determined by the determination means that the first state of secure pressure contact is not established; If the pressing member is not in the first state where writing or reading cannot be performed accurately, the magnetic head is prevented from writing or reading information, and a warning is issued. It is possible to prevent troubles during camera operation and subsequent film post-processing due to writing or reading of erroneous information, and to notify that information cannot be written or read.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of a camera according to a first embodiment of the present invention, FIG. 2 is a flow chart showing the operation of the control circuit shown in FIG. 1, and FIGS. 3 and 4 are a circuit block diagram of a camera according to a first embodiment of the present invention. FIG. 5 is a circuit block diagram of the camera in the second embodiment of the present invention; FIG. 6 is a flowchart showing the operation of the control circuit in FIG. 5; FIG. FIG. 2 is a plan view showing a film pressing member and its moving means in a second embodiment of the present invention. j...Magnetic head, 2...Film with magnetic memory section, 3...Lever for pressing, 4...
...Bat, 6...Rack lever, 10...
...Pad drive motor, 11.12...Switch, 16...Control circuit, 22...
magnetic head drive circuit, 23...warning display circuit,
24...Pad motor drive circuit, 26...
... Head motor drive circuit, 27 ... Control circuit, 201 ... Magnetic head, 202 ...
... Film with magnetic memory section, 203 ... Pressing lever, 205 ... Rack lever, 208 ...
...Head movement motor, 211.212...
...Switch, 213...Pad, 214...
...Interlocking lever, 215...Mounting plate, 21
8...Holding rod. Figure 1 Figure 3 Figure 4 Figure 5 Figure 7

Claims (2)

[Claims] (1) A magnetic head that writes or reads information to a magnetic storage section provided on a film; a pressure contact member that presses the magnetic head and the magnetic storage section of the film; At the time of reading, the pressing member is moved to a first state in which the magnetic head and the magnetic storage portion of the film are in pressure contact, and at other times, the pressing member is moved to the first state in which the magnetic head and the magnetic storage portion of the film are in pressure contact. In a camera using a film with a magnetic storage unit, which is equipped with a pressing member moving means for moving the film to a released second state, when the magnetic head writes or reads information, the pressing member moves the magnetic head and the film. a determining means for determining whether or not the magnetic head is in the first state of being in secure pressure contact with the magnetic storage section; 1. A camera using a film with a magnetic storage section, characterized in that it is provided with head drive control means for setting the head to a non-driving state. (2) A camera using a film with a magnetic storage unit according to claim 1, further comprising warning means for issuing a warning when the determining means determines that the first state of secure pressure contact is not established.