JP2879750B2 - Camera and cartridge display setting device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a camera capable of using a film cartridge containing a film with an information storage unit and having a display unit for displaying the use state of the film, and a camera therefor. The present invention relates to a cartridge display setting device applied to a kind of film cartridge.

BACKGROUND OF THE INVENTION In recent years, the following has been proposed in US Pat. No. 4,834,306 as a new type of film cartridge.

A film passage slit, a film fixed to one end of the film spool and wound on the film spool, and coaxially disposed on the film spool, the radial extension of the outermost periphery of the film is regulated by the regulating portion, and the outermost periphery of the film is regulated. A pressing member that prevents substantially contacting the inner wall of the film cartridge, and a release member that deforms a part of the pressing member and continuously releases the outermost peripheral portion of the film from the restriction in the radial direction of the pressing member, A guide member that guides the part of the film released from the regulation to the film passage slit is provided, and by the expansion of the outermost periphery due to the loosening of the film caused by the rotation of the film spool in the film extrusion direction,
The outer periphery of the film and the pressing member are kept in a slip-free state, and a driving force is applied in the direction in which the film is pushed out, so that the film can be discharged from the film cartridge. Hereinafter, this type of film cartridge capable of discharging the film by rotation of the film spool will be referred to as a thrust type film cartridge.

10 to 12 show this type of film cartridge. FIG. 10 is a longitudinal sectional view, FIG. 11 is a transverse sectional view, and FIG. 12 is a side view of a main part.

In these figures, 35 is a thrust type film cartridge, 37 is a film passage slit, 38 is a film spool, 38a is a fixing portion for fixing one end of the film 34, 39
Is a pressing member having a regulating portion 39a, 40 is a releasing member, and 41 is a guiding portion.

Unlike the conventional 35 mm film, the film cartridge as described above allows the film to be discharged out of the cartridge again by rotating the film spool in the cartridge even after the film is drawn into the film cartridge. Therefore, by using this film cartridge, it is possible to expose a frame in the middle of the film, rewind the film once, take it out of the camera, load the film again, and perform exposure (photographing) from the remaining frame. Is also possible.

In recent years, a film having an information storage unit (hereinafter, also referred to as a magnetic storage unit) is used, and photographing information such as shutter time, aperture value, date, title, and the like is written to the magnetic storage unit by a magnetic head. A camera that reads out the photographing information as necessary has been proposed in US Pat. No. 4,863,332.

Further, the following is proposed in U.S. Pat. No. 4,780,075. After the exposure is completed, the exposed information is written for each frame by the magnetic head, shooting is performed up to the frame in the middle of the film, rewound once in the film cartridge, and the film cartridge is loaded into the camera again Discriminating whether an exposed frame or an unexposed frame is written in the above-mentioned exposed information or not, and locates the unexposed frame to an aperture in order to enable photographing from an unexposed frame. It is.

Further, U.S. Pat. No. 4,887,110 proposes a film cartridge having a display for identifying whether the film has been used completely or partially.

However, a camera having both the functions proposed in the aforementioned U.S. Pat.No. 4,864,332 and the functions proposed in U.S. Pat.
When using a film cartridge with visible indications to identify whether the film has been completely or partially used as proposed in 4887110, driving a magnetic circuit including a magnetic head for some reason The power supply voltage of the camera has dropped below the voltage required to
Alternatively, the photographing is continued even though the writing of the exposed information to each frame is impossible due to a pressure contact between the magnetic head and the magnetic storage unit provided on the film, and then the film is rewound halfway. Then, if the film is loaded into another camera with the same function or a camera that is operating normally, it is impossible to write the exposed information described above for each frame. There is a problem in that the cueing is performed such that the exposure is performed from the piece which has become a double-exposure, and a piece which is double-exposed appears.

(Object of the Invention) The present invention has been made in view of the above circumstances, and finds an unphotographed frame when reusing a film that has been partially photographed based on information recorded in an information storage unit of the film. It is an object of the present invention to provide a camera and a cartridge display setting device which can prevent the failure of the display.

(Features of the Invention) In order to achieve the above object, according to the present invention, in a camera using a film cartridge having a display unit for displaying a use state of a film, information is stored in a film information storage unit. A recording head, and a determination unit that determines that predetermined recording cannot be performed by the head,
When the film is rewound during use without the determination unit determining that the predetermined recording cannot be performed by the head, the display unit of the film cartridge is displayed with a display indicating that the film is partially used. In addition to the setting, when the film is rewound during use by the determination means determining that the predetermined recording cannot be performed by the head, the display unit of the film cartridge is set to display that the film has been completely used. This is a camera having setting means.

According to a second aspect of the present invention, there is provided a cartridge display setting device applied to a film cartridge having a display unit for displaying a use state of a film, wherein a head for recording information in an information storage unit of the film; A determination unit that determines that the predetermined recording cannot be performed by the head; and a case where the film is rewound during use without the determination unit determining that the predetermined recording cannot be performed by the head. The display unit is set to display that the film is partially used, and the film is rewound during use when the determination unit determines that the predetermined recording cannot be performed by the head and the film is rewound during use. Setting means for setting the display section of the cartridge to an indication that all the film has been used. It is an location.

(Embodiment of the Invention) FIGS. 1 to 6 show a first embodiment of the present invention.

In FIGS. 3 and 4, reference numeral 1 denotes a magnetic head for recording information to and reading information from a magnetic storage unit of the film 2 running in the direction of arrow A. Installed. Reference numeral 3 denotes a pressing lever which is configured so that its long holes 3a, 3b are fitted to protrusions 9a, 9b provided on a base plate (not shown) and are slidable in the direction of arrow B. Reference numeral 4 denotes a pad whose protrusion 4a is rotatably attached to the pressing lever 3 and moves in conjunction with the pressing lever 3. Of the film contacting portions 4b, 4c, and 4d, the film contacting portion 4b is a concave. 4c and 4d are formed in a convex shape, respectively, and these film contact portions 4c, 4b and 4d are formed.
Has 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 3c of the pressing lever 3, and biases the pressing lever 3 upward in FIG.

Reference numeral 6 denotes a rack lever which is configured to be slidable in the direction of arrow B by fitting its elongated holes 6a, 6b to projections 9c, 9d of a base plate (not shown). Engagement with the part 3d is possible. Reference numeral 7 denotes a worm member rotatably attached to a base plate (not shown), and includes a worm wheel portion 7a meshing with a rack portion 6d of the rack lever 6 and a gear portion 7b. Reference numeral 8 denotes a spur gear that meshes with the gear portion 7b of the worm member 7, and is fixed to a rotation shaft of a pad driving motor 10 mounted on a base plate (not shown). Reference numeral 11 denotes a switch mounted on a base plate (not shown). The contact piece 11a can be brought into contact with the arm 6e of the rack lever 6, and the rotation of the pad driving motor 10 is stopped when the contact pieces 11a and 11b conduct. Then, the downward movement of the rack lever 6 is stopped.
Reference numeral 12 denotes a switch mounted on a base plate (not shown),
Can contact the arm 6e of the lock lever 6, and the contact pieces 12a and 12b
Is conducted, the rotation of the pad driving motor 10 is stopped, and the upward movement of the rack lever 6 is stopped.

The pad driving motor 10 is capable of normal rotation and reverse rotation, and the rack lever 6 is configured to move upward in FIG. 3 by normal rotation and move downward by reverse rotation.

In the above configuration, FIG. 3 shows the positional relationship between the members 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, the upward movement of the pressing lever 3 in FIG. 3 is restricted, and therefore, the film 2 and the pad 4 are not in contact with each other, so that the flatness of the film 2 is not affected. At this time, the contact pieces 11a and 11b are conducted, and the switch 11 is turned on, so that the further movement of the rack lever 6 downward is prohibited.

In this state, a photographing (exposure) operation on the film 2 is generally performed.

FIG. 4 shows the positional relationship of each member when writing or reading information to or from a magnetic storage unit (not shown) of the film 2 by the magnetic head 1. From the state of FIG. This state is achieved by rotating the pad driving motor 10 forward through the driving circuit. That is, when the pad driving motor 10 rotates forward, the rack lever 6 moves upward in FIG. 3 via the worm member 7, whereby the pressing lever 3 is released from the position regulation by the rack lever 6. It moves upward in accordance with the urging force of the spring 5 and stops in a state where the pad 4 rotatably attached to the tip thereof presses the film 2 against the magnetic head 1. When this state is reached, the arms 6e of the rack lever 6 make the connecting pieces 12a and 12b conductive, and the switch 12 is turned on, so that the power supply to the pad driving motor 10 is cut off and the motor 10 stops. Accordingly, the rack lever 6 also stops.

In this state, since the film 2 is correctly pressed against the magnetic head 1, it is possible to reliably write and read information to and from the magnetic storage unit of the film 2. When writing or reading this information, it goes without saying that the film 2 is fed in the direction of arrow A in FIG.

When the writing and reading of the information are completed, reverse energization of the pad driving motor 10 is performed. As a result, the motor 10 rotates in the reverse direction, and the rack lever 6 starts to move downward in FIG. 4, whereby the arm 6c of the rack lever 6 engages with the arm 3d of the pressing lever 3. Therefore, the pressing lever 3 also starts to move downward in the drawing against the urging force of the spring 5. Therefore, the pad 4 comes apart from the film 2 surface. Thereafter, since the contact pieces 11a and 11b are conducted by the arm 6e of the rack lever 6 and the switch 11 is turned on, the power supply to the pad driving motor 10 is cut off, and each member returns to the state shown in FIG. .

5 and 6 are diagrams showing the relationship between the film cartridge and the film leading end detecting means used in the present embodiment, and numeral 13 indicates whether the film has been completely used, or has been partially used, or This is a thrust-type film cartridge containing the above-mentioned film 2 having a magnetic storage unit capable of indicating whether the film is unused. Reference numeral 14 denotes a photo interrupter attached to a camera body (not shown),
Is for detecting the position of.

As a device for feeding the film 2 from the inside of the film cartridge 13, JP-A-2-67535 and JP-A-2-675.
No. 36, etc., and the details are omitted here because they are the same as these.

Here, when the film 2 is not used, the film notch hole
6 is located at the position shown in FIG. 6, and the characters "unused" on the display section 13a of the film cartridge 13 can be seen. When the film 2 is used only halfway, the film cartridge 13 of the film 2 is used.
The rewinding operation is performed until the notch 2b of the film 2 crosses the photo-interrupter 14, that is, the photo-interrupter 14 detects the position of the notch 2b of the film 2 so that the film feeding drive circuit described later The film rewinding operation is stopped, and the cutout hole 2a of the film 2 stops at the position where the character "halfway exposure" on the display unit 13a of the film cartridge 13 can be seen.

Therefore, the user knows whether the film is an unused film or a partially used film by checking the characters written on the display portion 13a of the film cartridge 13 which can be seen from the notch hole 2a of the film 2. be able to.

When the film 2 is completely used, the film notch 2b crosses the position of the photo interrupter 14,
The film rewinding operation is stopped after a lapse of time when the leading end of the film would have been securely wound into the film cartridge 13. Therefore, in this state, the film cartridge
The characters on the 13 display section 13a are all characters of "unused", "intermediate exposure", and "complete exposure", so that the user can easily know that the film 2 has been completely used. The rewinding method for recognizing the user that the film 2 has been completely used will be hereinafter referred to as "A rewinding".

Note that this "A rewind" is detected by the camera when the camera has run out of film residue (for example, a method of comparing the number of frames used with the specified number of frames of the film cartridge, or the last frame at the time of film winding). By using a known detection method such as tension detection, the rewinding may be automatically started or the rewinding may be started manually.

After the exposure is completed by the magnetic head 1, information indicating that the film has been exposed is written in the magnetic storage unit corresponding to each of the photographed frames of the film 2 that have been used halfway.

FIG. 1 is a block diagram showing a circuit configuration of a main part of a camera using a mechanism as shown in FIG. 3 and a thrust type film cartridge as described above.

In FIG. 1, reference numeral 16 denotes a control circuit composed of a microcomputer or the like for controlling various circuits of the camera. Reference numeral 17 denotes a film feed motor (not shown) for winding or rewinding the film 2. Film feed drive circuit,
Reference numeral 18 denotes a release switch that is turned on when a release operation of a release button (not shown) is performed. Reference numeral 19 denotes a cartridge loading detection switch that is turned on when the film cartridge 13 is loaded into the camera. Reference numeral 20 denotes a back cover switch that is turned on when the back cover is closed.
And 20 are connected in series. When both switches are turned on, the control circuit 16 operates the film feed drive circuit 17 to instruct the cueing of the film 2 to a predetermined frame.

Reference numeral 21 denotes a magnetic head drive circuit that controls the driving of the magnetic head 1 when writing information such as shutter time or reading information written therein to a magnetic storage unit provided in the film 2. A pad motor driving circuit for driving the pad driving motor 10 shown in FIGS. 3 and 4 is provided with an LED, a sound or a liquid crystal display for giving a warning when the power supply voltage of the camera falls below a predetermined level. Warning display circuit using
Is an AE / AF control circuit that performs focusing and exposure control of the taking lens.

Next, the operation of the control circuit 16 in FIG. 1 will be described with reference to the flowchart in FIG. The press-contact operation and the press-release operation of the film 2 and the magnetic head 1 have already been described with reference to FIGS.

"Step 101" It is determined whether or not the switches 19 and 20 are ON. When the switches are turned ON, the film cartridge is loaded in the camera and the back lid is closed, and the process proceeds to Step 102.

[Step 102] Using the A / D converter built in the control circuit 16, the magnetic head 1
A battery check is performed to determine whether or not the power supply voltage level is sufficient to drive the power supply. If the power supply voltage is sufficiently high, the process proceeds to step 104; otherwise, the process proceeds to step 103.

[Step 103] Here, the warning display circuit 23 is operated to display a warning indicating that the power supply voltage is not sufficient, and the operation of the camera thereafter is stopped.

[Step 104] The magnetic head 1 is pressed against the magnetic storage unit of the film 2 to detect whether or not the exposed information is written, and it is determined whether the film is an unused film or a partially used film. Make a determination. As a result, if it is determined that the film has been used halfway, step 106
The process proceeds to step 105 if it is determined that the film is unused.

"Step 105" Since film 2 is not used,
The film feed drive circuit 17 is operated to feed the film until the first frame of the film is located at the aperture of the camera.

[Step 106] Since the film 2 has been used halfway, the film feed drive circuit 17 is operated until the magnetic head 1 detects that the unexposed frame has reached the position of the aperture. Stop feeding.

"Step 107" It is determined whether or not the release switch 18 is ON. When the release switch 18 is turned ON, the process proceeds to Step 108.

[Step 108] The AE / AF control circuit 24 is operated.
Thus, a series of photographing operations such as an exposure operation by focusing the photographing lens and opening and closing the shutter are performed.

[Step 109] Here, a battery check is performed again to determine whether or not the power supply voltage level is such that the magnetic head 1 can be driven via the magnetic head drive circuit 21 using the A / D converter built in the control circuit 16. At this point, if the power supply voltage is sufficiently high, the process proceeds to step 114; otherwise, the process proceeds to step 110.

[Step 110] Here, since the magnetic head 1 cannot be driven, the film feed drive circuit 17 is immediately operated to start winding the frame whose photographing has been completed.

"Step 111" It is determined whether or not the winding of one frame has been completed by a known method.

"Step 112" A known method for determining whether or not there is a remainder (unexposed frame) of the film 2, that is, a method of comparing the defined number of frames of the film cartridge 13 with the number of photographed frames as described above, or The determination is made by a method such as film tension detection, and the process proceeds to step 115 by determining that there is no remaining film, and proceeds to step 113 when it is determined that there is an unexposed frame.

[Step 113] Here, it is determined whether or not an instruction to rewind the film in the middle of the film has been issued based on the state of the film rewind switch (not shown). As a result, if the instruction to rewind the film 2 halfway has not been issued, the process returns to step 107. If the instruction to rewind the film 2 halfway has been issued despite the presence of unexposed frames, the process proceeds to step 115. Then, "A rewind" is performed so that the user can determine that the film 2 has been completely used by looking at the film cartridge 13.

In other words, when the power supply voltage is not high enough to drive the magnetic head 1, the magnetic head 1 does not normally drive, so that it is not possible to write the exposed information to the frame that has been photographed. When the user performs rewind (hereinafter referred to as "B rewind") indicating that unexposed frames remain even though the exposed information has not been normally written (FIG. 6). Next, when the film cartridge 13 is loaded into the camera again, the camera performs cueing so as to start photographing from a frame having no exposed information. Double exposure. Therefore, in such a case, "A rewind" is performed.

If it is determined in step 109 that the power supply voltage is sufficiently high, the process proceeds to step 114 as described above.

[Step 114] Here, it is determined whether or not there is any remaining film 2, and the determination is made that there is no remaining film. Then, the process proceeds to 115 in the same manner as in step 112, and when it is determined that there are still unexposed frames. To step 116.

"Step 115" Since the photographing of the specified number of frames has been completed, the film feed drive circuit 17 is operated to perform "A rewind", and a series of operations of the camera is stopped.

On the other hand, if it is determined in step 114 that there is a remaining film frame number, the process proceeds to step 116 as described above.

[Step 116] The film feed drive circuit 17 is operated to start winding of the frame whose photographing has been completed.

[Step 117] In this step, the magnetic head drive circuit 21 is operated to write (or read) information such as exposed information and shutter time by the magnetic head 1 to the magnetic storage unit for the photographing frame being wound. Do.

"Step 118" It is determined whether or not the winding of the piece has been completed, and the flow proceeds to step 119 by ending.

"Step 119" It is determined from the state of the film rewind switch (not shown) whether or not an instruction to rewind the film has been issued. As a result, if an instruction to rewind halfway through the film has been issued, the process proceeds to step 120; otherwise, the process returns to step 107 to prepare for the next release.

"Step 120" Since the instruction to rewind the film is given, the film feed drive circuit 17 is operated to perform "B rewind", and a series of operations of the camera is stopped.

Although not particularly shown in FIG. 2, the magnetic head 1
The pad driving motor 10 is rotated in the reverse direction except when the information is recorded (at the time of information recording, reproduction, or cueing).
Away from the film 2 so that no pressure is applied to the film 2,
It goes without saying that the flatness of the film 2 is prevented from being deteriorated.

FIG. 7 shows the operation in the second embodiment of the present invention, which is a measure against the case where the exposed information cannot be written because the magnetic storage portion of the film and the magnetic head are not pressed against each other.

The mechanism for pressing the film and the magnetic head against each other and the circuit configuration of the camera are the same as those in the first embodiment, and the description will be made using the same reference numerals.

"Step 201" It is determined whether or not the switches 19 and 20 are ON. When the switches are turned ON, the film cartridge is loaded in the camera and the back cover is closed, and the process proceeds to Step 202.

"Step 202" It is determined whether or not the switch 12 shown in FIG. 3 and FIG. 4 is ON. If the switch 12 is ON, it is determined that the pressure contact between the film 2 and the magnetic head 1 is normally performed. Proceed to 204, and if it is OFF, proceed to step 203.

[Step 203] Here, the warning display circuit 23 is operated to display a warning indicating that the pressure contact between the film 2 and the magnetic head 1 is not performed properly, and the operation of the camera thereafter is stopped.

[Step 204] The magnetic head 1 is pressed against the magnetic storage unit of the film 2 to detect whether or not the exposed information has been written, and whether the film is an unused film or a partially used film is detected. Make a determination. As a result, if it is determined that the film has been used halfway, step 206
The process proceeds to step 205, and if it is determined that the film is unused, the process proceeds to step 205.

"Step 205" Since film 2 is not used,
The film feed drive circuit 17 is operated to feed the film until the first frame of the film is located at the aperture of the camera.

"Step 206" Since the film 2 has been used halfway, the film feed drive circuit 17 is operated until the magnetic head 1 detects that the unexposed frame has reached the position of the aperture. Stop feeding.

[Step 207] It is determined whether or not the release switch 18 is ON.

"Step 208" The AE / AF control circuit 24 is operated.
Thus, a series of photographing operations such as an exposure operation by focusing the photographing lens and opening and closing the shutter are performed.

[Step 209] As in Step 202, it is determined whether or not the switch 12 shown in FIGS. 3 and 4 is ON. If the switch 12 is ON, the pressure contact between the film 2 and the magnetic head 1 is normal. Since the writing of the exposed information by the magnetic head 1 is performed accurately, the process proceeds to step 214,
If so, the writing of the exposed information by the magnetic head 1 is not performed accurately, so the process proceeds to step 210.

[Step 210] Here, since accurate information cannot be written by the magnetic head 1, the film feed drive circuit 17 is immediately operated to start winding the frame whose photographing has been completed.

"Step 211" It is determined whether or not the winding of one frame has been completed by a known method.

"Step 212" It is determined whether or not there is a remaining film 2 by a known method. If it is determined that there is no remaining film 2, the process proceeds to step 215. If it is determined that there is still an unexposed frame, the process proceeds to step 215. Proceed to 213.

[Step 213] Here, it is determined whether or not an instruction to rewind the film in the middle of the film has been issued based on the state of the film rewind switch (not shown). As a result, if the instruction to rewind the film 2 halfway has not been issued, the process returns to step 207. If the instruction to rewind the film 2 halfway has been issued despite the presence of unexposed frames, the process returns to step 215. Proceed,
"A rewind" is performed so that the user can determine that the film 2 is completely used by looking at the film cartridge 13.

That is, when the film 2 and the magnetic head 1 are not properly pressed against each other, it is not possible to write the exposed information on the frame that has been photographed. If “B rewind” is performed even though the exposed information has not been written normally, the next time the film cartridge 13 is loaded into the camera again,
Since the camera performs cueing so as to start shooting from a frame having no exposed information, a frame for which normal writing could not be performed has double exposure. Therefore, in such a case, "A rewind" is performed.

In step 209, the magnetic head 1 and the film 2
If it is determined that the pressure contact is normally performed, the process proceeds to step 214 as described above.

[Step 214] Here, it is determined whether or not there is a remaining film 2, and it is determined that there is no remaining film. Then, the process proceeds to 215 in the same manner as in step 212, and it is determined that there is still an unexposed frame. To step 216.

[Step 215] Since the photographing of the specified number of frames has been completed, the film feed drive circuit 17 is operated to perform “A rewind”, and a series of operations of the camera is stopped.

On the other hand, if it is determined in step 214 that there is a remaining film frame number, the process proceeds to step 216 as described above.

[Step 216] The film feed drive circuit 17 is operated to start winding the frame whose photographing has been completed.

[Step 217] In this step, the magnetic head drive circuit 21 is operated to write (or read) information such as exposed information and shutter time into the magnetic storage unit for the photographing frame being wound by the magnetic head 1. Do.

[Step 218] It is determined whether or not the winding of the piece has been completed, and the flow advances to Step 219 by ending the determination.

"Step 219" It is determined whether or not an instruction to rewind in the middle of the film is issued based on the state of the unwind switch in the middle of the film (not shown). As a result, if an instruction to rewind in the middle of the film has been issued, the process proceeds to step 220; otherwise, the process returns to step 207 to prepare for the next release.

"Step 220" Since an instruction to rewind the film is issued, the film feed drive circuit 17 is operated to perform "B rewind", and a series of operations of the camera is stopped.

Also in FIG. 7, the operation of reversing the pad driving motor 10 and separating the pad 4 from the film 2 is omitted except when the magnetic head 1 is used (at the time of recording, reproducing or cueing of information). However, in this case, the above operation is performed to prevent the pressure from being applied to the film 2 and to prevent the flatness of the film 2 from being deteriorated.

FIGS. 8 and 9 show a film cartridge according to a third embodiment of the present invention. Reference numeral 25 denotes a film cartridge having a display portion 25a, and reference numeral 26 denotes photosensitive paper adhered to the film cartridge 25. .

"A" indicating to the user that the film has been completely used
In the `` rewind '' state, the film is
After all the sheets have been stored in the camera, a circle is placed on the photosensitive paper 26 at the “completely exposed” position as shown in FIG. 8 by a heating unit (not shown) of the camera, and unexposed frames remain on the film. In the "B rewind" state shown to the user, after all the film is stored in the film cartridge 25, the heating unit (not shown) of the camera puts the photosensitive paper 26 on the photosensitive paper 26 at the "halfway exposure" as shown in FIG. Mark ○.

The method of displaying whether the film in the film cartridge has been completely used or whether there is a remaining unexposed frame is not limited to this.

According to the above embodiments, the power supply voltage of the camera does not have a voltage level necessary to drive the magnetic head,
Alternatively, it is impossible to write exposed information to a frame after shooting (exposure), for example, because the pressure contact between the magnetic head and the film is defective due to a mechanical cause. In the state, when the film is rewound before the shooting of all the frames is completed, so-called midway rewinding is performed, the indication that the film has been completely used is displayed on the surface of the film cartridge. This prevents the user from reloading the film cartridge in the middle of rewinding state in which the exposed information has not been written normally and performing double exposure.

(Effects of the Invention) As described above, according to the present invention, the cueing of an unphotographed frame when reusing a film that has been partially photographed based on the information recorded in the information storage unit of the film can be prevented. It is possible to provide a camera and a cartridge display setting device which can prevent the camera and the cartridge display.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a camera showing a first embodiment of the present invention, FIG. 2 is a flowchart showing the operation of a control circuit shown in FIG. 1, and FIG. FIG. 4 is a plan view showing the positional relationship of members, FIG. 4 is a plan view showing the positional relationship of each member when information is written or read on a film by a magnetic head, and FIG. 5 is used in this embodiment. FIG. 6 is an enlarged view showing a main part of the film cartridge and the film leading end detecting means, FIG. 7 is a flowchart showing the operation in the second embodiment of the present invention, and FIGS. Is a perspective view showing a film cartridge according to a third embodiment of the present invention, FIG. 10 is a longitudinal sectional view of a thrust type film cartridge used in the present embodiment, FIG. 11 is a transverse sectional view thereof, and FIG. Haso It is a side view. 1 ... magnetic head, 2 ... film with magnetic storage, 3 ...
... pressing lever, 4 ... pad, 5 ... rack lever,
11,12 ... Switch, 13 ... Film cartridge, 16
... Control circuit, 17 ... Film feeding drive circuit, 21 ... Magnetic head drive circuit, 22 ... Pad motor drive circuit, 25
…… Film cartridge, 25a …… Display part.

Claims (2)

(57) [Claims] 1. A camera using a film cartridge having a display unit for displaying a use state of a film, a head for recording information in an information storage unit of the film,
Determining means for determining that the predetermined recording cannot be performed by the head; and the film when the film is rewound during use without the determining means determining that the predetermined recording cannot be performed by the head. When the display portion of the cartridge is set to display indicating that the film has been partially used, and when the determination means determines that the predetermined recording cannot be performed by the head and the film is rewound during use, Setting means for setting the display section of the film cartridge to display that all the film has been used. 2. A cartridge display setting device applied to a film cartridge having a display unit for displaying a use state of a film, wherein a head for recording information in an information storage unit of the film and a predetermined recording by the head are performed. And a display unit of the film cartridge when the film is rewound during use without the determination unit determining that the predetermined recording cannot be performed by the head. When the film is rewound during use while the display is set to indicate that the portion has been used, and the determination unit determines that the predetermined recording cannot be performed by the head, the display portion of the film cartridge is set to the film position. Setting means for setting a display used for all cartridges. .