JPH0468329A - Camera provided with magnetic head - Google Patents

Abstract

PURPOSE:To rapidly and surely set a frame which has not been photographed at a photographing position by reading all the photographic data recorded on a magnetic surface when a film is taken up to a spool from a cartridge and setting the frame which has not been photographed at the photographing position based on the data. CONSTITUTION:When a cartridge 6 is loaded, a magnetic head part 1 reads the photographic data recorded in the film by every frame by interlocking with the film's temporarily being taken up to the spool 7 by a pre-winding mechanism, all the photographic data are stored in a memory. And a controlling means 4 discriminates the frame which has not been photographed based on the presence or absence of the photographic data, the film is fed by driving the pre-winding mechanism in such a way that the frame which has not been photographed is set at the photographing position. Thus, even though the film loaded has been photographed halfway of the frames, the frame which has not been photographed is surely set at the photographing position.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a camera equipped with a magnetic head for writing and reading data on a film having a magnetic surface for recording photographic data.

[Conventional technology]

Conventionally, a film having a magnetic surface made of a magnetic material has been disclosed in JP-A-59-79236 and JP-A-60-17447 so that photographic data can be read and written. ing. When using such films, the camera is equipped with a magnetic head for processing the data. In addition, this film can be used by recording the film's sensitivity and number of frames in advance on the magnetic surface, and having the camera read this data when loading the film, or by recording the shooting data for each frame on the magnetic surface at the time of shooting. One possibility is to record the film on the screen and use it when printing, but there are also other possibilities, such as rewinding the film before the specified number of shots have been taken and leaving some unshot frames or frames remaining. The camera and film cartridge are configured so that they can be loaded, and when reloading, the camera reads whether shooting data has been recorded for each frame, and based on the determination of whether or not shooting data has been recorded, unshot frames are It is conceivable to make it possible to take pictures only in . It is preferable to use a film having a magnetic surface for the purpose of reloading from the viewpoint of eliminating wasted film and allowing the film to be easily replaced even during shooting.

[Problem to be solved by the invention]

However, when using film with a magnetic surface for this purpose, it would be necessary to wind the film one frame at a time from the cartridge to the spool and judge whether or not there is shooting data each time, just as in normal shooting. For example 24
If the 24th frame of the film has not yet been photographed, it takes a considerable amount of time to set that frame, which is extremely troublesome for the photographer, as it takes time to determine whether there is photographic data or not. become. Therefore, although it is possible to reload the film and take pictures with unshot frames with such a camera, it can be said that it is extremely impractical. On the other hand, to prevent such problems from occurring,
Is it possible to configure the camera to read the data for each frame while winding the film at high speed? If so, it would be very difficult to accurately stop the film at an unshot frame. . Therefore, the technical problem to be solved by the present invention is that when reloading a film that has been shot up to the middle frame,
The object of the present invention is to quickly and reliably set an unphotographed frame to a photographing position, and to put into practical use a camera with a magnetic head capable of reloading such a film.

[Means to solve the problem]

In order to solve the above technical problem, the camera with a magnetic head according to the present invention adopts a prewind method, and in prewind cameras, magnetic All the shooting data recorded on the screen is read,
The configuration is such that an unphotographed frame or a photographing position is set based on the presence or absence of the data. A specific configuration for this purpose includes a magnetic head section for writing and reading data on a film having a magnetic surface for recording photographic data;
A prewind mechanism that winds the film from the cartridge onto the spool in advance before starting shooting, and winds the film onto the cartridge in order from the photographed frame, and a prewind mechanism that works in conjunction with the winding operation of the film onto the spool. A control device that reads photographic data for all frames of the film from the magnetic head, and also uses the prewind mechanism to run the film in order to distinguish unphotographed frames from the data and set the unphotographed frames at the photographing position. and means. Further, it is preferable that this camera is provided with a memory divided into areas for recording photographic data read from the magnetic head section in a memory area corresponding to each frame of the loaded film.

[Action/effect]

In a camera configured in this way, when the cartridge is loaded, the film is once wound up by the prewind mechanism, and the shooting data recorded on the film is transferred from the magnetic head section for each frame. It is read and, if a memory is provided, all photographic data is recorded there. Then, the control means determines the unphotographed frame based on the presence or absence of the photographic data, and drives the prewind mechanism to advance the film so as to set the unphotographed frame at the photographing position. Therefore, even if the loaded film has already been shot up to the middle frame and is L,
This ensures that only unshot frames are set to the shooting position. In this way, with the above configuration, time is not required only for reading the photographic data, and the photographic data for all frames is read when the film is wound onto the spool, which is an operation that is always performed in the prewind method. Only one reading is performed. Also, based on the data read at that time, the film is only advanced so that only the unshot frames are set to the shooting position, which is different from searching for unshot frames while advancing frames. Setting is quick, and at the same time, setting of unshot frames is reliable, unlike searching for unshot frames while advancing the film at high speed. As a result, it is possible to easily and reliably photograph only the unphotographed frames even if the film has been partially photographed, making it very practical as a camera for effectively utilizing film. (L + person “to margin”)

【Example】

Embodiments of the camera with a magnetic head according to the present invention will be described in detail below with reference to FIGS. 1 to 27. Although the details will be described later, in the camera of this embodiment, when the film is stored inside the case and placed in a predetermined position in the body, the film can be driven by the camera and sent out to be wound around the spool. A cartridge configured as follows is used. This camera uses a magnetic head 2 fixed to the body of the camera, and a magnetic head 2, as shown in Fig. The magnetic head part 1 includes a pad 3 that is driven by a drive mechanism 4 and moves between a position pressed against the pad 2 and a position slightly separated from the position. The magnetic head unit 1 reads and writes photographic information on the film at the data processing position where the butt 3 is pressed against the magnetic head 2 and the film is sandwiched between them. The "magnetic head section" is set at a retracted position where the pad 3 is located away from the magnetic head 2 so that the film can be moved freely between the pads 3 and the magnetic head 2. The magnetic head section 1 is provided at a predetermined position between the cartridge 6 of the film and the spool 7 on which the film is wound. A drive mechanism 4 that moves the pad 3 between the above positions and sets the head unit 1 to either the data processing position or the retreat position is fixed to one end of the pad 3 and is moved in a direction perpendicular to the film surface. No. 10 configured to be movable
8, a 20th socket 9 for moving this 10th socket 8 and setting its position, and further this 20th socket 9.
It is composed of a drive lever 1O that swings to move the 20th stop 9, and a stopper 11 that restricts the movement of the 20th stop 9 against the driving force of the drive lever 10. The tenth button 8 has an elongated hole 13 into which two fixing pins 12 provided on the body side are fitted.
At the same time as the direction of movement is regulated, the difference between the distance between each bin 12 and the length of the elongated hole 13 is set as the amount of movement. Further, since a tension spring 14 is provided between the tenth body 8 and the body 5a, the bat 3 is normally set at a position away from the head 2 due to the action of the spring 14. The 20th sword 9 has two fixing pins 15
By being installed so that it fits into the elongated hole 16,
The direction and amount of movement are regulated. Also, this 20th
The prong 9 is formed by bringing the claw 8a formed on the tenth prong 8 and the prong 9a formed on the twentieth prong 9 into contact with each other.
It is connected to the first rod 8 via a tension spring 17 so as to restrict the relative positional relationship with the rod 8 in one direction. The drive lever 10, which moves the 20th lever 9 toward the magnetic head 2 along the length 16, is driven by a motor (see numeral 24 in FIG. 2) as a drive source via a friction transmission mechanism. It is composed of The stopper 1 is composed of a 30th stop 18, a lever 22, and a plunger 23. The 30th pin 18 is a pawl 1 that restricts movement of the 20th pin 9 by engaging with a pawl 9b formed on the 20th pin 9.
8a, and an elongated hole 20 into which two fixing pins 19 are fitted in order to restrict the direction and amount of movement of these claws 9b and 18a so as to mutually lock and release them. have. The 30th lever 18 is a lever 22 that swings around the fulcrum 21 in order to actually perform such an operation.
It is connected to the plunger 23 via. This camera employs a prewind method in which the film stored in the cartridge 6 is wound onto a spool in advance, and then the film is wound into the cartridge 6 in order from the photographed frames. Each operation of prewinding and winding the film, and the drive mechanism 4 described above.
These operations are performed by the same motor, and the configuration of the drive system for the prewind and winding operations, including the motors that drive these operations, is shown in FIG. 2, so the configuration will be explained here. In the figure, 24 indicates a motor that is a drive source for each of the above-mentioned operations. This motor 24 is connected to an input gear 26 via a reduction gear system 25 (in the figure, only the pitch circle diameter of all gears is shown by a solid line for simplicity)
. An output gear 27 having the same rotation center as the input gear 26 is attached to the input gear 26 . input gear 26
As shown in FIG. 3, which shows a cross section taken along the line ■-■ in FIG. The output gear 27 is formed with a hole 27a that fits into the protrusion 26a, and an arcuate groove 27b that follows the trajectory of the protrusion 26b as the input gear 26 rotates. The rotation of the output gear 27 is controlled by the input gear 28 for driving the spool.
and are transmitted to each of the drive input gears 39 of the fork 36 that operate the film via a gear train (not shown) (shown by broken lines). A planetary carrier 31 holding a planetary gear 29 with this gear 28 as a sun gear is rotatably attached to a shaft 37 that supports the input gear 28 for the spool. It is configured such that driving or non-driving of the spool 7 can be selected by engaging or disengaging the planetary gear 29 or the spool gear 30. Further, on the shaft 38 supporting the fork input gear 39, an L-shaped planetary carrier 3 holding two planetary gears 32 and 33 with this gear 39 as a sun gear is attached.
4 is rotatably attached, and the fork manual gear 3
These planetary gears 32 and 33 engage and disengage from the fork gear 35 in accordance with the rotation of the fork 3.
It is configured such that driving/non-driving and rotation direction when driven can be selected. The operational states of the mechanism described above are shown in Figure 1 from Figure 4.
Although FIG. 7 shows the prewind and winding states of the film, in order to explain these operations using the flowcharts shown in FIGS. 23 to 27,
First, the configuration of the electric circuit of this camera will be explained using the block section shown in FIG. CP shown in the center of the figure represents a microcomputer (hereinafter referred to as a microcomputer) that controls the operation of this camera. FLS shown above the microcomputer CP is a flash control section, and controls the light emission operation of the flash through the microcomputer CP. Furthermore, LM and AP shown at the lower right of the flash control FLs represent a photometry section and a distance measurement section, respectively, which perform photometry and distance measurement according to commands from the microcomputer CP, and send measurement data to the microcomputer CP. give feedback. DS further below indicates a display control section, which controls the display of various data in a display window provided on the body of the camera. S shown below the display control section DS. to S9 indicate various switches, and the operation of the camera is determined depending on the on/off states of these switches. So is the main switch to operate the camera in the on state,
I is a photometry switch that performs photometry when in the on state, and S is a release switch that performs shutter release when in the on state. Also, this camera is a camera that performs zooming electrically, and the S is turned on by operating the zoom switch button on the camera body to the wide-angle side, and the viewfinder is moved from the telephoto side to the wide-angle side. It is a zoom out switch that changes to the side, S4
is a zoom-in switch that is turned on by operating the zoom switch button in the opposite direction to the telephoto side, changing the viewfinder from the wide side to the telephoto side. In addition, since the photographing range changes according to the operation of the finder, the photographing lens may also be zoomed accordingly, or the photographing lens itself may not be zoomed and the print area may be limited to accommodate the changing photographic range. Trimming information is given to the film at the time of shooting. Also,
S5 shown below S4 indicates a cartridge lid switch that is turned on when the opening/closing lid for inserting the cartridge into the body is closed. S6 is a film winding detection switch that is turned on when the film is wound around the spool by a signal from a detection means provided to detect the state in which the film is wound around the spool, and S7 is a film winding detection switch that is turned on when the film is wound around the spool. This is a magnetic head position detection switch that turns off when the magnetic head is in the position. S8 is a flash switch that controls the flash on/off depending on the on/off state, and S9 is off when the loaded film is unused and when it is used. This is a film use display detection switch that turns on. Here, a configuration for detecting whether or not a film has been used by turning on and off the film usage indication detection switch will be explained together with the film cartridge used in this camera. First, the cartridge 6 used in this camera has an external shape as shown in FIG.
A film status display means 50 indicating whether the film has been used or not is provided at one end of the film. This film status display means 50 allows the photographer to distinguish between used and unused film at a glance, and allows the microcomputer CP to determine whether the film is used or not, and performs operations according to the status. It will be done. This film status display means 50 has a concave portion 5 as shown in FIGS.
1, and a slide member 52 that is movable laterally within the slide member 52.
Whether the above-mentioned film is used or not is determined according to the position of this slide member 52. A detection means 55 provided on the camera side for detecting the position of the slide member 52 is a film use display detection switch 58 (indicated by S in FIG. 18).
A protrusion 53a is provided on the body 53 so as to be inserted into the recess 51 with the cartridge 6 attached, and a detection piece 54a is protruded from the through hole 53b toward the cartridge 6 when attached to the body 53. and an L-shaped detection lever 54. The detection lever 54 is
The fixing bottle 57 is fitted into the elongated hole 56 and the body 53 is pushed along the elongated hole by the tension spring 59.
The film display detection switch 58 is mounted on the film display detection switch 58.
is provided immediately to the side of this lever 54. Figure 20 shows how to insert an unused cartridge into the camera body 53.
This shows the state immediately before installation. In an unused cartridge, the slide member 52 is located on the side of the protrusion 53a of the body 53, so as shown in the figure, the slide member 52 is located on the side of the protrusion 53a.
comes into contact with the tapered portion 52a of the slide member 52, and at the same time, the detection piece 54a of the detection lever 54 or the recess 5 of the cartridge
It is inserted into 1. Therefore, as shown in FIG. 21, when the cartridge 6 is further installed, the slide member 52 moves under the action of the protrusion 53a and presses the detection lever 54 toward the detection switch 58.
8 changes to the on state. Further, FIG. 22 shows the installed state of a used cartridge in which the film has been partially photographed or a used cartridge in which the film has been photographed to the end. Therefore, when the cartridge 6 is installed, the slide member 52 comes into contact with the detection piece 54a and tilts the detection lever 54, and the detection switch 58 is not operated, so the detection switch 58 is maintained in the OFF state. be done. In this way, the film status display means 50 detects when the film is attached to the camera in an unused state.
When the film is in use or has been used, the detection means 55 is not operated and the state of the film itself does not change. has been done. On the other hand, in the block diagram shown in FIG.
The DTC shown below P is a data control section connected to the magnetic head HD for processing photographic data for film. Further, AC shown on the left side of the microcomputer CP is an actuator drive unit, and a first motor M for prewinding and winding the film and driving the magnetic head unit 1.
, (numeral 24 in FIG. 2), a second motor M7 that operates the finder between the wide-angle position and the telephoto position, and a plunger PL (the first
23) in the figure are controlled respectively. Incidentally, the plunger PL is activated by applying a positive pulse voltage to the second.
The engagement between Tanikaze 9b and 18a of the 30th point 9.18 is released to allow the bat 3 to move toward the head 2 side, and a negative pulse voltage is applied to Tanikaze 9b. +8a is engaged to prohibit the pad 3 from moving toward the head 2 side. Further, EX shown below AC is an exposure control section, which controls the operation of the third motor M3 that focuses the photographing lens and drives the camera. EN shown further below is a tanu zoom encoder that detects the zoom position of the finder. The PI below it indicates a photo interrupter for detecting whether or not the film has been advanced for each frame. Next, the operation of this camera configured as described above will be explained using the flowcharts shown in FIGS. 23 to 27 and the operation state diagrams shown in FIGS. 4 to 17. Note that in these flowcharts, each operation step is indicated by the symbol S. FIG. 23 shows the main routine for the overall operation of this camera. In step 001, the camera is in a stopped state and is waiting for human input. If any operation is performed in this state, it is determined in step 002 whether the cartridge lid switch S has been switched from OFF to OFF, that is, whether the cartridge lid has been closed. If the switch S5 changes from off to on as the cartridge lid is closed, then in step 003, the film is prewinded according to the prewind subroutine shown in FIGS. 24 to 26. After this prewind, and if switch S5 has not been turned on, in step 004, main switch S is turned on. It is determined whether or not the button is on and the shutter release is possible. And main switch S. is off or the release prohibition flag is set, a display indicating that the main power is off is made in step 005, and then the process returns to step 001 and the state is again set to wait for input. On the other hand, as a result of the determination in step 004, the main switch S. If it is determined that the camera is off and the release is possible, a display indicating that the main power is on is displayed in step 006, and then it is determined whether the metering switch S1 has been switched from off to off. (Step 0
07). If there is no change in the photometry switch S, it is determined in step 008 whether the zoom out switch S3 is on, and if it is on, a zoom out subroutine is executed accordingly, and the viewfinder zooms. Out is performed (step 009). on the other hand,
If zoom out switch S3 is off, step 0
At step 10, it is determined whether the zoom-in switch S4 is on. If it is determined that it is on, a zoom-in subroutine is executed in step 11 to zoom in the finder. These switches S,,S
, are off, the data is displayed in step 012, and then the process returns to step 001 to return to the input waiting state. When it is determined in step 007 that the photometry switch Sl has been switched from off to on, a subroutine for photometry is executed in step 013. Then, in step 014, it is determined whether the photometry switch S is still maintained in the on state after photometry is performed, and if it is turned off, the process returns to step 001 via step 012,
It will be waiting for input again. Conversely, if the photometry switch S is maintained in the on state, it is determined in step 015 whether the release switch S has been turned on, and if it is off, steps 013 to 015 are repeated. On the other hand, when the release switch S is set to ON, a focus detection routine is performed in step 016 as an operation immediately before the shutter release in order to ensure focusing, and then the third motor M described above is activated. Then, the photographic lens is focused in accordance with the detected focal position (step 017), and the shutter is driven to perform exposure control (step 018). When the exposure control is completed, in step 019, the film is wound one frame and the shooting information is recorded on the film according to the subroutine shown in FIG. Become. Next, the film prewind operation shown in step 003 in this main routine will be explained using the flowcharts shown in FIGS. 24 to 26 and the operation state diagrams shown in FIGS. 1 to 13. . When the prewind routine is executed, first, in step 101, two types of error counters EFLI and EFL2 are reset to 0 in order to count the number of errors during automatic film loading. Then, in order to prohibit photographing during prewind, a release prohibition flag is set in step 102. Next, in step +03, it is determined whether the loaded film is unused or already used, and in order to distinguish between used and unused film,
The flag NFL is set to 0 if the cartridge is an unused cartridge, and to l if the cartridge is a used cartridge. However, it is detected that the film has already been used and the
Even if the film is set to FL or I, it is unclear at this point whether the film was taken out and reloaded during shooting, or whether all frames have been shot or reloaded. When the above settings are completed, in step +04, it is determined whether the magnetic head flft (I) is in the data processing position or in the retreat position from the on/off state of the magnetic head position detection switch S7. If it is on, that is, if it is determined that the magnetic head portion l is in the retracted position, a negative pulse voltage is applied to the plunger PL in step +05, thereby first causing the pad 3 to move toward the head 2 side. The head portion l and the drive mechanism 4 shown in FIG. 1 motor M1 starts normal rotation.As shown in FIGS. 4 and 5, the operating state at this time is that the drive lever 10 swings due to the rotation of the motor 24 (first motor M,). 20th point 9 head 2
However, due to the engagement between the claws 9b and 18a, the friction transmission mechanism slips, and the 20th prong 9 remains in that position, maintaining the retracted position of the head l. On the other hand, the rotation of the motor 24 is also transmitted to each input gear 28, 39, and the spool gear 30 and fork gear 35 rotate via the planetary gear 2932 in accordance with the rotation, so that the spool 7 and the fork 36 are rotated. Driven. Therefore, as the fork 36 rotates, the film is gradually pushed out from the cartridge 6 and passes between the magnetic head 2 and pad 3 toward the spool as shown in FIG. Subsequently, in step 107, a timer is started to detect whether a loading error occurs within a predetermined time. Then, in step 108, it is determined from the state of the magnetic head position detection switch S7 whether or not the magnetic head unit 1 is still maintained at the retracted position, and further, in steps +09 and 110, the film winding detection switch is It is determined whether Sm is turned on, that is, whether the film is wound around the spool 7. As a result, when it is detected that the film is wound around the spool 7, the first motor M1 is temporarily stopped in step 111. Then, in step 112, a positive pulse voltage is applied to the plunger PL, and the 30th step! 8 retreats from the engagement position with the 20th bolt 9, and in step 113, the PI counter interlocked with the photointerrupter PI is reset to 0, and in step 114, the first motor M1 starts normal rotation again. (Figure 6.7). At this time, the 30th Tudo I
8 has been retracted from the engagement position with the 20th bolt 9,
Driven by the rotation of motor M)<-10, the second
The head 9 moves toward the magnetic head 2, and the springs 14 and 17
Due to this action, the magnetic head 2 and pad 3 are pressed against each other with a predetermined force, and the magnetic head portion l moves to the data processing position (FIG. 8.9). The spool 7 is driven by a gear train so that its circumferential speed is always faster than the circumferential speed of the fork 36, and the film is driven by the spool 7.
After the planetary carrier 32 is wound around the fork gear 35, the meshing state between the planetary carrier 32 and the fork gear 35 is released as shown in FIGS. 7 and 9. In addition, in order to check whether the magnetic throat section 1 has been set to the data processing position within a predetermined time by normal rotation of the motor, the magnetic head position is set within the time set by the timer in steps 115, 116, and 117. It is determined whether the detection switch S7 is turned off. If this switch S7 is turned off, it means that the positioning of the magnetic head l to the data processing position during prewinding has been completed, or if it remains on and does not change, it is assumed that an abnormality has occurred and the process proceeds to step 118. Camera stops working. In this way, in the above configuration, when the cartridge 6 is loaded and the film is fed out, the head section 1 is set to the retracted position through which the film can easily pass through, and is set to the data processing position after the film is reliably wound around the spool 7. Ru. Therefore, it is effectively possible to prevent the leading edge of the film from being caught by the magnetic heads 2 to 3 constituting the magnetic head section l or the pads 3 during feeding, thereby effectively preventing errors in film loading. By the way, after entering this prewind subroutine, after the error counter etc. are set as described above, if it is determined in step 104 that the magnetic head section 1 is at the data processing position, first in step 119. The first motor M starts reverse rotation, simultaneously starts a timer, and detects the state of the magnetic head position detection switch S to determine whether the head l has moved to the retracted position within a predetermined time. It is determined (step 120.
121, 122). When the head portion l changes to the retracted position, the first motor M is activated in step 123. After the camera stops, the operations from step 105 onward are carried out as described above, but if the head section 1 does not change to the retracted position, it is assumed that an abnormality has occurred, and all functions of the camera are stopped at step 124. Also, in step +08, the film spool 7
When it is determined that the head l has changed to the data processing position even though the head l has not been wrapped around the head l, the error counter EFL1 is counted by one in step 125, and if the counted number becomes four or more? Step 12:
It is determined by 6. If the error occurs less than 4 times, step 119 jumps and the subsequent operations described above are performed; if the error occurs on the same side 4 times, step 12
At step 7, an abnormality occurs and the operation stops. Also, in step 108, it was confirmed that the head section 1 was maintaining the retracted position, but the next step! If it is determined in step 09 that the film has not been wound around the spool 7 within the predetermined time, another error counter EFL2 is counted by one (step 128).
). In this case as well, it is determined in step 129 whether the error has occurred four or more times, and if it is determined that the error has occurred four or more times, the camera function is stopped in step +33 as an abnormality. do. On the other hand, if the error occurs less than 4 times, there is a possibility that the film has been advanced a little by the subsequent operations, so in steps 130, 131, and 132, the motor M is reversed for a predetermined period of time, and then the film is fed out again. The operations after step 104 are executed. In the above-described flow, the magnetic head l moves to step 116.
When the data processing position is set and prewind is started, operations thereafter are sequentially performed according to the flowchart shown in FIG. First, in step 134, a data reading/processing subroutine is entered, where data such as film sensitivity and number of shots are read into the microcomputer and processed. Then step 114
The photointerrupter PI is switched by the operation of the motor at step 135 and 136 to determine whether or not the film has been advanced by one frame, and in that case, whether or not the film has reached the specified number of sheets. If not, the PI counter is counted by one (step 137). For film that has been shot once, data to that effect is written in the frames that have been shot, so step +
At step 38, it is detected whether photographic data has been recorded for the switched frame, and at step 139, it is determined whether or not the data exists. As a result, if it is confirmed that no photographic data is recorded in that frame and that it can be photographed, in step 140, a memory map is created to remember that the frame corresponding to the PI counter can be photographed. A shooting permission flag is set in a predetermined memory area in the memory divided into areas,
The operations from step +35 onward are repeated until the specified number of sheets is reached. On the other hand, if it is recognized in step 139 that data is recorded in that frame, step 1
Depending on whether the flag NFL is 1 in 41,
A check is made to see if the cartridge has been reloaded. If it is a reloaded cartridge, it is natural that shooting data is recorded in that frame (L), so in step 142, the frame corresponding to that PI counter is stored in the memory in order to memorize that it cannot be shot. After the photographing permission flag is reset in a predetermined memory area, the operations from step +35 onwards are executed again until the prescribed number of images is reached. When the film is pre-wound to the specified number of sheets while reading the photographic data in this manner, the motor M is activated in steps 143 and 144. After stopping for -1 time, it starts reversing for normal winding. In this case, as shown in FIG. 11, the spool gear 30 becomes free when the planetary gear 29 is separated, and the fork gear 35 is reversed by the action of the planetary gear 33 so that the film can be wound up. At the same time, in step 145, the presence or absence of a photographable flag in the memory is checked to see if there are any frames on the loaded film that can be photographed. If there is a photographing permission flag, the number of frames to be fed up to that frame is set in step 146, and the film is fed by that number in steps 147-149. This state is shown in FIG. 10, or as shown in FIG.
, (24), the 20th column 9 is pressed against the head 2 side to maintain the head portion 1 at the data processing position. With this configuration, data is read for all frames of the film during prewind, so a frame that can be filmed is reliably detected and shooting continues from that frame, so no film is wasted. Even if you change the film in the middle of shooting, you can easily take the next shot. Further, since the prewind is used to determine whether or not each frame can be photographed, no special time is required for this detection. When the film is advanced to a frame that can be photographed in the above manner, the motor M is activated at step +50. starts rotating forward, and at the same time step 151.152153
Then, it is determined whether the head portion l has been switched to the retracted position within a predetermined time. If the head part l does not switch to the retracted position, all functions of the camera are stopped as an abnormality in step 154, or if the head part is not switched normally,
In step 155, motor M is stopped, and then in step 156, the release prohibition flag is reset. The setting of the photographing state is thus completed, and as a result, the mechanism section is set to the state shown in FIGS. 12 and 13. In addition,
The head portion 1 is set to the retracted position by moving the groove 27 without rotating the output gear 27, as shown in the operating state in FIG.
This is done by rotating the input gear 26 within the range in which the protrusion 26b of the input gear 26 slides within b.If the input gear 26 rotates further, the output gear 27 rotates simultaneously with the input gear 26 to advance the film. At the same time, the drive lever 10 also swings so as to press the 20th arm 9 toward the head 2 side. By the way, if it is determined that there are no frames that can be photographed as a result of the determination in step 145, this means that the photographed film has been loaded by mistake, and the reversal of the motor M1 started in step 144 will cause the film to be reloaded. 4"I'll have to rewind the film until the PI count reaches 0 (
Steps 157-159). Then, in steps 160 and 161, one film fed during autoloading is rewound for a predetermined time, and then, in step 162, a warning is displayed as to whether the cartridge is loaded or used. After one time, the program returns to the main routine. Therefore, in this case, the photographer can remove the cartridge and load a new cartridge. On the other hand, when determining the data for each frame when prewinding the film, it is determined in step +39 that there is shooting data for that frame, but if it is determined in step +41 that the flag N F L is not l. This means that photographic data is recorded even though the film status display means 50 of the cartridge indicates that it is unused. This happens because the camera is equipped with a
Is it possible that the cause is that the means 55 for detecting whether the film has been used or not is not operating properly, or that the slide member 52 of the display means 50 provided on the cartridge has been moved by mistake? However, if the image is taken as it is, there is a risk that a mistake will be made, such as double photography.In such a case, the following steps will be taken. That is, at steps +63 and +64, the motor M1 is stopped and reversed, and the film is rewound by the number of frames that have been fed from that frame to the frame where the PI counter becomes 0 (steps 165 to 167). Then, in steps 168 and 169, the film fed during autoloading is further rewound, and step 1
At 70, after an indication that the loaded cartridge is not suitable, the process returns to the main routine. Therefore, in this case as well, the photographer can take out the cartridge (-1) and load a new cartridge, thereby preventing photographic errors. In addition, it is possible to program the cartridge so that it can perform photographing even if it is determined that photographic data is recorded even though the cartridge is unused. The flow in that case is shown in FIG. 26, and the operation is either L or the operation is completely the same as that shown in FIG. 25 except for the different parts. Further, the same operation is shown in the same number of steps as in FIG. 25. In this flow, when such contradictory judgments are made in steps +39 and 141, step 171 is performed.
, it will be displayed that there is such an abnormality in the film. Following this display, in step +42), a frame corresponding to the PI counter is memorized to indicate that it cannot be photographed.Secondly, a photographable flag is set in a predetermined memory area in the memory. Then, the operations from step 135 onward are executed again until the specified number of sheets is reached. That is, in this flow, a tentative warning is given to the photographer, but priority is given to the determined data and settings are made to enable photography. By programming in this way, even if a cartridge 6 is loaded in which the film status display means 50 has been moved by mistake,
You can continue shooting as usual. That's it, this power...
This is the prewind operation in Mera. Next, regarding the one-frame winding and information processing subroutine executed as step 019 in the main routine shown in FIG. 23, the follow chart shown in FIG. This will be explained in detail using the following sections. First, in order to prevent release from occurring during film winding, an L/release prohibition flag is set in step 201. Next, in step 202, the motor M starts to rotate in reverse, and at the same time, in step 203, a timer is started. Then, in steps 204' and 205, it is checked whether the head section I is set at the data processing position by determining the state of the magnetic head position detection switch S7. If the head portion l has not moved from the retracted position, in step 206, all functions of the camera are stopped as an abnormality has occurred. On the other hand, when the head section 1 is set at the data processing position, in step 207, photographing information is written onto the film. This state is shown in FIGS. 14 and 15. Then, as shown in steps 208 and 209, when it is determined that the film has been advanced one frame by switching the PI double signal, the motor M is stopped. Depending on whether the film is pre-wound before being shot or when it is taken normally without pre-winding, shooting starts from the opposite end of the film. In the case of a film that was shot halfway through the film, or a film that was shot at both ends of the film by performing both normal shooting and shooting after prewinding, the next frame after winding one frame may have already been shot. There are cases. Therefore, whether or not the frame can be photographed is determined based on the presence or absence of a photographable flag in the memory (step 210). As a result, if the shooting flag is set, it is determined in step 21 whether or not all the film in that cartridge has been taken.
It is determined by 1. If the film is not finished yet, the head M starts to rotate forward in step 212, and then in steps 213 to 215, the magnetic head position detection switch S7 is turned on within a predetermined time. It is checked whether the magnetic head WIl has been switched to the retracted position. If it has not yet been switched, all functions of the camera are stopped as an abnormality in step 216; on the other hand, if it has been switched, step 217
At step 218, the motor M is stopped, and at step 218, the release prohibition flag is reset, and a photographing possible state is set. This state is shown in FIGS. 16 and 17. As explained above, the head section 1 is normally set at the retracted position and is set at the data processing position only when winding the film (including prewinding) using the driving force of the winding motor. There is no need for special means or electric power to hold the head l at each position, and the position of the head l can be controlled by a simple mechanism, so space and cost can be saved. On the other hand, in step 210 described above, when it is determined whether or not the frame is set and can be photographed, if it is confirmed that the photographable flag is not set, step 2+9
And P! The counter is set to the frame number at that point. Then, between steps 220 and 223, the PI
The film is rewound until the counter reaches 0, and in steps 224 and 225, the amount of advance during autoloading is rewound. Then, a message indicating that the film has ended is displayed (step 226), and the process returns to the main routine. If it is determined in step 2+1 that the film has ended, the process jumps from there to step 227 and step 224, where the amount of advance during autoloading is rewound, and then the film is finished and the film is finished. is displayed (step 226), and the process returns to the main routine. In this way, all unshot frames are detected during prewinding, and based on that data, the film is rewound when all frames have been shot, so even partially shot film is not wasted. , the film can be easily replaced without double exposure. Note that in this camera, the pad 3 of the head portion l is configured to be movable, but it is also possible to configure the pad 3 to be fixed and the magnetic head 2 to be configured to be movable. Further, instead of the planter 23 provided for controlling the position of the head section 1, a mechanism may be provided that detects the amount of film feed and mechanically switches the position.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the head section and drive mechanism of a camera with a magnetic head according to the present invention, FIG. 2 is a configuration diagram of a film prewind and winding drive system, and FIG. Line sectional views, Figures 4 to 17 are visual diagrams of the operating state of the mechanism shown in Figures 1 or 2, Figure 18 is a block diagram showing the electrical circuit of this camera, and Figure 19 is a diagram of this camera. 20 to 22 are partial cross-sectional views showing the structure and operating state of the film used/unused detection unit, and Figs. 23 to 27 show the operation of this camera. FIG. l-Magnetic head section, 2. Magnetic head, 3.. Pad, 4
Drive mechanism, 5.Body, 6.Cartridge, 7...
Spool, 8...10th thread, 9...20th thread, 10
Drive lever, 1] ・Stopper 12 ・Fixing pin,
13 - Long hole, 14 - Tension spring, 15 Fixed pin, 16 - Long hole, 17 - Tension spring, 18 - 30th hole, 19 - Fixed pin, 20 - Long hole, 21 - Fulcrum pin, 22・ Lever 23: Plunger, 24: Motor, 25 Reduction system, 26: Input gear, 27: Output gear,
28... Input gear for spool, 29... Planetary gear, 3
0... Suburkya, 31... Planetary carrier, 32.3
3 Planet gear, 34... Planet carrier, 35... Fork gear, 36... Fork, 37. 38... Shaft, 3
9. Input gear for fork, 50. Film status display means, 51. Recess, 52.. Slide member, 53. Body, 54.. Detection lever, 55. Detection means, 56. Elongated hole.
57・Pin, 58・Detection switch, 5・Tension spring

Claims (2)

[Claims] (1) In a camera equipped with a magnetic head (1) for writing and reading data on a film having a magnetic surface for recording photographic data, the film is placed in a cartridge (6) in advance. ) to spool (7)
A prewind mechanism (24 to 37) for starting shooting after winding the film and winding the film into the cartridge (6) in order from the photographed frame, and a spool of the film by the prewind mechanism (24 to 37). 7
) in conjunction with the winding operation to the magnetic head section (1).
The film is run by the prewind mechanism (24 to 37) in order to read photographic data for all frames of the film from the camera, identify unphotographed frames based on the presence or absence of the data, and set the unphotographed frames at the photographing position. A camera with a magnetic head, characterized in that it is equipped with a control means (CP) for controlling the magnetic head. (2) A memory according to claim 1, further comprising a memory divided into areas for recording photographic data read from the magnetic head section (1) in a memory area corresponding to each frame of the film. Camera with magnetic head.