JPH06266000A - Camera with magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] The unexposed frame can be positioned accurately and quickly when the film is taken out halfway, and the film can be taken out halfway quickly. [Structure] Arbitrary frames are exposed during film winding.
Information can be reproduced from the magnetic recording area of the frame immediately before facing the char, and magnetic recording of the frame when the frame facing the aperture during film rewinding is fed to the cartridge side. The magnetic head 102 arranged at a position where information can be recorded with respect to the area, the rewinding of the film is started in response to the midway rewinding command, the unexposed frame information is recorded for the first frame, and the subsequent frames are recorded. Storage means 1 for pieces
First control means 105 for recording the information stored in 03.
And second control means 106 that reproduces information from the magnetic recording area of the film in synchronism with the initial winding of the loaded half-taken film and stops the initial winding when the unexposed frame information is reproduced. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a magnetic head capable of recording / reproducing information on / from a magnetic recording area of a film.

[0002]

2. Description of the Related Art In Japanese Patent Laid-Open No. 3-223736, a film provided with a magnetic recording area corresponding to each photographing frame is used. A camera that records information such as an exposure value (hereinafter, referred to as shooting information) with a magnetic head is disclosed.
The photographing information recorded on this film is read in a laboratory and printed as characters on the back surface of the print, for example.

FIG. 7 shows a conventional camera having a magnetic head, 1 is a camera body, 2 is a film cartridge loaded in the camera body, 3 is a film drawn from the cartridge, and 4 is an aperture. Reference numeral 5 is a magnetic head. By the magnetic head 5, the above-mentioned photographing information and unexposed frame information are recorded in the magnetic recording area 3a (see FIG. 8) provided corresponding to each frame of the film 3, or the information recorded in the magnetic recording area 3a is recorded. Can be played. Conventionally, the magnetic head 5 is arranged at a position closer to the film winding direction (on the left side in the drawing) with respect to the aperture 4, and according to this, one frame is facing the aperture 4. It is possible to record the photographing information in the magnetic recording area 3a of the frame when it is wound up.

On the other hand, the loaded film is exposed up to a halfway frame, the film is rewound once with the unexposed frame left and taken out from the camera, and the halfway taken film is loaded again into the camera and exposed. May continue. In this case, it is conceivable to perform the following control in order to allow only unexposed frames to be exposed without performing double exposure when reloading the film. That is, first, when the film is taken out on the way, information indicating the unexposed frame (hereinafter, unexposed frame information) is recorded in the magnetic recording area of the unexposed frame by the magnetic head. Then, when the film taken out halfway is loaded into the camera again, the information is reproduced from the magnetic recording area of each frame by the magnetic head along with the initial film winding (winding), and the unexposed frame is reproduced only on the frame after the reproduced frame. Allow exposure.

[0005]

However, in the arrangement of the magnetic head as shown in FIG. 7, when the above-mentioned unexposed frame information is reproduced when the information is reproduced on the film taken out in the middle, the corresponding unexposed frame is not reproduced. The exposure frame has already passed through the aperture 4, and it is necessary to rewind one frame after stopping film winding in order to start shooting from that frame. For this reason, it takes time to position the unexposed frame, and there is a risk of missing a photo opportunity. In addition, since the feeding system is generally different between winding and rewinding the film, winding the film to position an arbitrary frame,
The time from when the motor is stopped until the film is stopped is slightly different from when the film is rewound and positioned. Therefore, it is necessary to change the timing of stopping the motor between winding and rewinding, which requires complicated control. In particular, when the film is rewound by one frame and positioned, if the film overruns, a part of the positioned frame may overlap with the exposed frame in front of it, which may result in double exposure. Therefore, it is necessary to strictly control the motor stop time.

On the other hand, when the unexposed frame information is recorded for the unexposed frame when the film is taken out halfway, the film is not wound immediately in response to the halfway out (rewind) command but is wound up once. On the other hand, since the unexposed frame information is recorded in the magnetic recording area of the unexposed frame and the film is rewound after that, it takes time to take out the film, which is a problem when the film needs to be replaced promptly. .

It is an object of the present invention to accurately and quickly position an unexposed frame when a film is taken out halfway without performing complicated film stop control, and to take out a film halfway quickly. It is to provide a camera having.

[0008]

The present invention will be described with reference to FIG. 1, which is a diagram corresponding to the claims. In the present invention, a camera in which a film cartridge containing a film having a magnetic recording area corresponding to each frame can be loaded is mounted. Applied to. Then, the film feeding means 10 for winding and rewinding the film
1 and the information can be reproduced from the magnetic recording area of the frame immediately before the arbitrary frame faces the aperture when the film is wound, and the frame facing the aperture when the film is rewound is the card. A magnetic head 102 arranged at a position where information can be recorded in the magnetic recording area of the frame when fed to the trench side; and storage means 103 for storing information to be recorded in each frame for each frame. , A command means 104 for instructing the midway rewinding of a film in a state where an unexposed frame is left on the film, and the rewinding of the film is started in response to the midway rewinding command, and the frame which first passes through the magnetic head 102 is Information is recorded in the magnetic recording area, and each piece of information stored in the storage means 103 is associated with each piece for the pieces that pass through the magnetic head 102 thereafter. The first control means 105 for controlling the feeding means 101 and the magnetic head 102 for recording and the initial winding of the loaded intermediate take-out film are performed, and the information is reproduced from the film magnetic recording area in synchronization with the initial winding. When the unexposed frame information is reproduced, the second means for controlling the feeding means 101 and the magnetic head 102 so as to stop the initial winding in a state where the frame corresponding to the magnetic recording area faces the aperture. The control means 106 is provided to solve the above problems.

[0009]

When the midway rewinding command is issued in order to take out the film midway, the film rewinding is started, and the film which has passed through the magnetic head 102 (the unexposed frame closest to the leading end) is not yet recorded in the magnetic recording area. The exposure frame information is recorded. That is, the magnetic head 102 is arranged at a position where information can be recorded in the magnetic recording area of the frame when the frame facing the aperture at the time of film rewinding is fed to the cartridge side. At the time of rewinding, the unexposed frame information can be recorded in the unexposed frame closest to the leading end, and the conventional operation of winding the film once is unnecessary. Further, with respect to the frame (exposed frame) that passes through the magnetic head 102 after that, each information stored in the storage means is recorded in association with each frame. That is, in the present invention, the information is not recorded for each frame feed after shooting, but is recorded collectively at the time of rewinding. On the other hand, when a film taken out on the way is loaded into the camera, the film is initially wound, and in synchronization with this, information is reproduced from the film magnetic recording area. When the unexposed frame information is reproduced, the initial winding is stopped with the frame corresponding to the magnetic recording area facing the aperture. That is, since the magnetic head 102 is arranged at a position where information can be reproduced from the magnetic recording area of the frame immediately before the arbitrary frame faces the aperture during film winding, the magnetic head 102 is most rewound without performing rewinding. The unexposed frame near the tip can be positioned.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 2 shows a camera according to the present invention, and the same parts as those in FIG. 7 are designated by the same reference numerals. 1 is a camera body, 2 is a film cartridge loaded in the camera body, 3 is a film drawn from the cartridge, 4 is an aperture,
5 is the magnetic recording area 3 of the film in synchronism with the film rewinding.
It is a magnetic head for recording information in a and reproducing the information recorded in the magnetic recording area 3a (FIG. 8) along with film winding.

The magnetic head 5 of the present embodiment is provided on the cartridge chamber side with respect to the aperture 4 as shown in the drawing, and therefore, when winding the film, an arbitrary piece is arranged as an aperture.
The reproduction of information on the magnetic recording area 3a of the frame is started before facing the aperture 4, and the reproduction is completed immediately before facing the aperture 4. On the other hand, when the film is rewound, information is recorded in the magnetic recording area 3a of the frame when the frame facing the aperture 4 is fed to the cartridge side.

FIG. 3 is a block diagram showing the control system of the camera. The magnetic head 5 is transferred to the CPU 11 via the serial / PPM conversion circuit 12 and the magnetic recording circuit 13.
Are connected. The magnetic head 5 also has a CP via a reproducing circuit 14 and a PPM / serial converting circuit 15.
It is connected to U11. Serial / PPM conversion circuit 12
Converts the recording serial signal from the CPU 11 into a PPM signal and outputs the PPM signal to the recording circuit 13. The recording circuit 13 drives the magnetic head 5 to record the PPM signal in the film magnetic recording area 3a. On the other hand, the reproduction circuit 14
Drives the magnetic head 5 to reproduce the signal input to the film 3, and inputs the reproduced PPM signal to the PPM / serial conversion circuit 15. PPM / serial conversion circuit 15
Converts the input PPM signal into a serial signal and C
Input to PU11.

The CPU 11 is also connected to a film use state detection circuit 16, a photo interrupter 17 for perforation detection, a memory 18 and a motor driver 19, and a film feeding motor 20 is connected to the motor driver 19. ing. Film usage condition detection circuit 1
Reference numeral 6 is for detecting the film use state from a film use state display mechanism provided on the cartridge 2. The state of use of the film is an unused film in which no film 3 is exposed, or a film taken out halfway unwound in a state of being exposed to an intermediate frame and leaving an unexposed frame,
Alternatively, it indicates whether the film has been exposed for all frames. Details of such a usage status display mechanism and its detection circuit are omitted because they are not directly related to the present invention.
For example, a mechanism disclosed in Japanese Patent Laid-Open No. 4-76526 by the present applicant may be used.

The memory 18 also stores shooting information (for example, shooting date and exposure value) for each frame of the film in association with each frame. This is because the photographing information is recorded by the magnetic head 5 in the magnetic recording area 3a of each frame in synchronization with the film rewinding. Further, in this embodiment, the magnetic head 5 can record the unexposed frame information in the magnetic recording area 3a of the unexposed frame. Further, the CPU 11 performs an operation member 22 for changing (adding, deleting, correcting) the information stored in the memory 18, and changes the information stored in the memory 18 in accordance with the operation of the operating member 22. Information change circuit 21
And a liquid crystal display device (hereinafter, LC
(Referred to as D) is connected and is turned on in conjunction with the half-press operation of a release button (not shown)
A release switch SW2 that is turned on by fully pressing the release button and a midway rewind switch SW3 are also connected. Here, the operating member 22 includes a plurality of switches, and the information changing circuit 21 can add information such as arbitrary characters to the information recorded in the memory 18 according to the operation of the operating member 22. it can.

Next, the procedure of control by the CPU 11 will be described with reference to the flowcharts of FIGS. Figure 4
In step S1, the process waits until the cartridge chamber is closed. When it is closed, the presence or absence of cartridge loading is detected in step S2. If it is not loaded, the process ends, and if it is loaded, the process proceeds to step S3. In step S3, the film use state is determined based on the output of the film use state detection circuit 16. Here, in the present embodiment, the used film is prevented from being loaded into the camera. Therefore, in step S3, it is determined whether the film is an unused film or a film taken out in the middle. And
If it is an unused film, in step S4, the film feeding motor 20 is rotated in the forward direction through the motor driver 19 to start the initial feeding (winding) of the film. In step S5, the first frame is set (opposed to the aperture 4), and when it is set, the motor 2 is set in step S6.
0, that is, the initial film feeding is stopped, and then the process proceeds to step S13.

On the other hand, if it is determined in step S3 that the film is taken out in the middle, the process proceeds to step S7, in which the initial feeding is started in the same manner as described above, and in step S8 the magnetic head 5 is provided with the magnetic recording area 3a of the film 3. Abutting against the exposed part (head touch). In step S9, the magnetic head 5 is driven through the reproducing circuit 14 to move the magnetic recording area 3
Information for one frame is reproduced from a, and it is determined in step S10 whether the reproduced information is unexposed frame information. If step S10 is negative, the process returns to step S9 to continue information reproduction, and if unexposed frame information is detected, the magnetic head 5 is retracted from the film 3 (head detachment) in step S11, and is fed in step S12. The motor 20 is stopped to stop the initial film feeding.

Here, in this embodiment, as described above, the magnetic head 5 is arranged so that the information reproduction for an arbitrary piece is completed just before the arbitrary piece faces the aperture 4 when the film is wound. , The above steps S7 to S1
By the control of 2, the winding is stopped while the unexposed frame closest to the tip is positioned in the aperture 4.

Next, in step S13, it is determined whether the midway rewind switch SW3 is on or off, and if it is off, it is determined whether the halfway press switch SW1 is on or off in step S14. If the half-push switch SW1 is off, step S1
Returning to step 3, if it is on, the process proceeds to step S15 in FIG.
In step S15, photometry and distance measurement are performed via a distance measuring device and a photometric device (not shown), and the process waits until the release switch SW2 is turned on in step S16. When the release switch SW2 is turned on, an exposure process (photographing) is performed in step S17, the process proceeds to step S18, and photographing information regarding the photographing frame is stored in the memory 18. In step S19, film winding is started, and in step S20, the process waits until the winding of one frame is completed.
Stop winding with. Next, in step S211, the information for magnetic recording stored in the memory 18 is displayed on the LCD 23.
To display. In step S212, it is determined whether information change is designated. This determination is made based on whether or not the operating member 22 has been operated within a predetermined time. If step S212 is denied, the process proceeds to step S22, and if affirmative, the process proceeds to step S213. Step S213
Then, according to the operation of the operation member 22, the above step S1
The information recorded in 8 is changed (added, deleted, corrected), and then the process proceeds to step S22.

In step S22, it is determined whether or not the photographing frame is the last frame. If the result is negative, the process returns to step S13 in FIG. 4, and if the result is affirmative, the process proceeds to step S23. Step S2
In 3 the film rewinding is started, then step S24
The head is touched in step S25, and the shooting information for one frame recorded in the memory 18 in step S25 is recorded in the film magnetic recording area 3
Record in a. In step S26, it is determined whether or not the winding is completed. If it is not completed, the process returns to step S25, and if it is completed, the process proceeds to step S27 to stop the rewinding.

By the control of steps S23 to S27, each information stored in the memory 18 is sequentially recorded in the magnetic recording area 3a of each frame in synchronization with the film rewinding. Since the information in the memory 18 is the information stored at the time of shooting each shooting frame, if the magnetic recording is performed in the reverse order of the stored order, the shooting information of that frame will be surely recorded in the magnetic recording area 3a of each frame. Can be recorded. Then step S
The head is detached at 28, and the used film is displayed at step S29. That is, the used state display mechanism of the cartridge is driven to display that the film is a used film.

On the other hand, if it is determined in step S13 in FIG. 4 that the midway rewind switch SW3 is ON, the process proceeds to step S30 in FIG. 6 to determine whether or not one or more frames have been photographed since the film was loaded. To judge. If no frame has been photographed, the process proceeds to step S31 to start film rewinding. In step S32, it waits until the rewinding is completed, and when it is completed, the rewinding is stopped in step S33.
In step S34, it is determined whether the loaded film is an unused film or a half-taken film. If the film is an unused film, the cartridge display mechanism is left as it is in the unused film display in step S35, and the half-taken film is taken. In the case of, the half-taken-out film display is left as it is in step S36. After steps S35 and S36, the process ends.

On the other hand, if it is determined in step S30 that one or more frames have been photographed, the head is touched in step S37, and the film rewinding is started in step S38. In step S39, while the film is rewound by one frame, that frame (the frame that first passes through the magnetic head 5,
The unexposed frame information is recorded in the magnetic recording area 3a which is the unexposed frame from the front end. That is, in the magnetic head 5, the frame facing the aperture 4 when the film is rewound is the card.
The magnetic recording area 3a of the frame when it is fed to the trench side
Since it is arranged at a position where information can be recorded in, the unexposed frame information can be recorded in the unexposed frame closest to the front end at the time of rewinding. Here, at the time of film loading, the above steps S7-
Since the unexposed frame closest to the leading end is detected and shooting is allowed from that frame as in S12, it is sufficient here to record the unexposed frame information only for the unexposed frame closest to the leading end. is there.

Thereafter, the photographing information for one frame recorded in the memory 18 in step S40 is recorded in the film magnetic recording area 3a.
To record. In step S41, it is determined whether or not the winding is completed. If it is not completed, the process returns to step S40. If it is completed, the head detachment is performed in step S42, and the rewinding is stopped in step S43. Then, in step S44, the cartridge display mechanism is switched to the film display state on the way and the processing is terminated.

The above is the control procedure by the CPU 11. According to this procedure, some frames are photographed after the film is loaded, and when the midway rewind switch SW3 is turned on, the rewinding of the film 3 is started, and the first frame passing through the magnetic head 5 (most The unexposed frame information is recorded in the unexposed frame near the tip), and the memory 1 is recorded for the frames (exposed frames) that pass through the magnetic head thereafter.
Each shooting information stored in 8 is recorded in association with each frame. Therefore, it is not necessary to wind the film once in order to record the unexposed frame information when the rewind switch SW3 is turned on, and the film can be rapidly rewound. When the exposure of all frames is completed, the film is automatically rewound, and at this time, the shooting information stored in the memory 18 is recorded for each frame.

Further, in this embodiment, 1 is set after the film is loaded.
If no frame is photographed, the unexposed frame information is not recorded. In other words, if one frame is not photographed on an unused film, it is still an unused film, so it is not necessary to record the unexposed frame information, and no film is photographed on the half-taken film. In this case, it is not necessary to newly record the unexposed frame information recorded at the previous shooting. By thus omitting useless magnetic recording, the life of the power supply battery can be extended.

On the other hand, when a half-taken-out film is loaded, the film is initially wound, and in synchronization with this, information is reproduced from the film magnetic recording area 3a. When the unexposed frame information is reproduced, the initial winding is stopped with the frame corresponding to the magnetic recording area 3a facing the aperture 4. That is, since the magnetic head 5 is arranged at a position where information can be reproduced from the magnetic recording area 3a of the frame immediately before the arbitrary frame faces the aperture 4 during film winding, the magnetic head 5 must be rewound each time. Instead, the unexposed frame closest to the tip can be positioned.

In the configuration of the above embodiment, the film feeding motor 20 and the motor drive circuit 19 are the film feeding means 101, the memory 18 is the storage means 103, the midway rewind switch SW3 is the command means 104, and the CPU 11 is the CPU 11. The first and second control means 105 and 106 are respectively configured.

In the above, an example using a cartridge having a film use state display mechanism is shown, but the present invention can be applied to a cartridge having no display means of this kind. In this case, for example, a manual switch is added, the switch is turned off when an unused film is loaded, and turned on when an unloaded film is loaded, the determination in step S3 of FIG. This may be done by turning on / off a manual switch. Therefore, the film use state display processing in the above flow chart is not essential to the present invention.

[0029]

According to the present invention, when the frame facing the aperture during the film rewinding is fed to the cartridge side, the magnetic recording area of the frame can be recorded with information. Since the magnetic head is arranged, the unexposed frame information can be recorded in the unexposed frame closest to the leading end without winding the film once at the time of rewinding the film on the way, so that the film can be taken out quickly. Further, since the information stored in the storage means is recorded in batch on the exposed frame when the film is rewound, the following effects can be obtained. That is, in general, the film feeding speed is not stable immediately before the film feeding is started and immediately before the film feeding is stopped, and the magnetic recording operation cannot be performed. The recording time during transmission is short and only a small amount of information can be recorded.
On the other hand, when information is recorded collectively at the time of rewinding as in the present invention, it is not necessary to stop the film for each frame, so that magnetic recording can be performed at a stable speed over the whole. In addition to reducing recording errors, the amount of information recorded on each frame can be increased. Further, in the conventional method of recording one frame by one frame at the time of feeding a film frame, when the recorded information is changed, the film is rewound by one frame after the information of the frame is recorded, and then rerecorded while being wound. Such a complicated operation is required. To avoid such complicated operations, it is necessary to specify information change before shooting. In this case, miss the photo opportunity to enter information or change it only after shooting. There is no such information (for example, when a certain happening is photographed and a character or the like indicating the content is recorded) and the like cannot be designated in advance. In that respect, according to the present invention, information is recorded collectively at the time of rewinding, not immediately after shooting,
You can freely change information (stored information) even after shooting each frame without performing complicated feeding control, do not miss a shutter opportunity for information input, and change only after shooting You can freely change the information that you cannot do. On the other hand, since the magnetic head is arranged at a position where information can be reproduced from the magnetic recording area of the frame immediately before the arbitrary frame opposes the aperture when the film is wound, the film after being taken out halfway By stopping the initial winding as the unexposed frame information is reproduced during the initial winding, the unexposed frame closest to the leading end can be positioned without performing rewinding one by one. Therefore, the unexposed frame can be quickly positioned, and complicated control such as changing the feed motor stop timing between winding and rewinding is unnecessary. In particular, when the unexposed frame is positioned, even if the film overruns, it does not overlap the exposed frame, so it is not necessary to strictly control the motor stop timing.

[Brief description of drawings]

FIG. 1 is a complaint correspondence diagram.

FIG. 2 is a diagram showing a configuration of a camera according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a control system of the camera.

FIG. 4 is a flowchart illustrating the operation of the embodiment.

FIG. 5 is a flowchart following FIG. 4;

FIG. 6 is a flowchart following FIG. 4;

FIG. 7 is a diagram showing a configuration of a conventional camera.

FIG. 8 is a view showing a film having a magnetic recording area.

[Explanation of symbols]

 1 camera body 2 film cartridge 3 film 3a magnetic recording area 4 aperture 5 magnetic head 13 recording circuit 14 reproducing circuit 18 memory 19 motor driver 20 film feeding motor SW1 half-press switch SW2 release switch SW3 midway rewind switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriichi Yokonuma 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Nikon Corporation

Claims (1)

[Claims] 1. A camera in which a film cartridge containing a film having a magnetic recording area corresponding to each frame can be loaded, and a film feeding unit for winding and rewinding the film, and the film. Information can be reproduced from the magnetic recording area of the frame immediately before the arbitrary frame faces the aperture during winding, and the frame facing the aperture at the time of film rewinding is on the cartridge side. A magnetic head arranged at a position where information can be recorded in the magnetic recording area of the frame when fed, storage means for storing information to be recorded in each frame for each frame, and unexposed on film Instructing means for instructing the midway rewinding of the film with the frame left, and starting the rewinding of the film in accordance with the midway rewinding command, and first passing through the magnetic head. In order to record the unexposed frame information in the magnetic recording area, the information stored in the storage means should be recorded in correspondence with each frame for the frames passing through the magnetic head thereafter. The first control means for controlling the feeding means and the magnetic head and the initial winding of the loaded intermediate take-out film are performed, and information is reproduced from the film magnetic recording area in synchronization with the initial winding. When the unexposed frame information is reproduced, a second control means for controlling the feeding means and the magnetic head to stop the initial winding with the frame corresponding to the magnetic recording area facing the aperture. A camera having a magnetic head.