JPS60173530A - Blind exposure mechanism of stand-by wind type camera - Google Patents

Abstract

PURPOSE:To execute blind exposure even when a film does not exist in a film running path, by providing the first film detecting switch for making the operation of a counter switch impossible, and the second film detecting switch for making the operation of a mode changeover switch impossible. CONSTITUTION:When a blind exposure is executed in a state that a cartridge 32 is not loaded and a rear cover is closed, an initial switch SH for holding an initial state of a frame feed turns on, and a relay RL connects a relay switch RLS to normally opening contact NO. A current flows through a rear cover switch SC, the second film detecting switch SF2 connected to the second contact S, a mode changeover switch 400 connected to a stand-by wind contact R, a driving motor 2, and the relay switch RLS connected to the normally opening contact NO. That is to say, although the mode changeover switch 400 is connected to the stand-by wind contact R, a current flows to the driving motor 2 in the same direction as the time of a photographing mode. The driving motor 2 turns in the photographing mode direction, an arm member 18 turns, and the second planet gear 20 moves to the position shown by an imaginary line 20' and is engaged to a transfer gear train 30.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an aerial photographing device for a pre-wound camera, and more particularly, to an aerial photographing device for a pre-winding camera, and more particularly, to an aerial photographing device for a pre-winding camera. The present invention relates to a copying device for a pre-winding type camera capable of copying, that is, shirt release and straw light emission.

[Prior art]

In conventional pre-winding type cameras, there is a problem that ・Aerial photography is not possible because the camera is in pre-winding mode when the mother trone is removed, and the shutter system and strike t2 system cannot be checked. [Objective of the Invention] The present invention was made in view of the above-mentioned problems of the conventional pre-winding type camera. To provide an aerial copying device for a pre-winding second camera which is capable of copying even when no film is present and has an extremely simple electrical configuration.

[Structure of the invention]

The present invention has the following structural features to achieve the above object. In other words, one aspect of the present invention is a pre-winding mode in which the film is continuously wound onto a stool after loading the film and prior to shooting, and a shooting mode in which the film is rewound one frame at a time onto the cutrone using a mode changeover switch after the pre-winding is completed. It is a pre-winding type camera that switches to a pre-winding mode, and detects that there is no film in the film travel path by operating a counter switch that turns ON at the count position from the last frame to #I, where all the film has been rewound to 9 Torones. The film detection switch is configured to include a first film detection switch that disables the operation of the mode changeover switch by detecting that there is no film on the film travel path, and a second film detection switch that disables the operation of the mode changeover switch by detecting that there is no film on the film travel path. If the camera back is closed without the Torone being loaded, the drive motor is essentially connected to the shooting mode and the flash material is emitted during the shutter release.
This makes it possible to

〔Example〕

Practical examples of the present invention will be explained below based on the drawings.

In this example, when a cartridge is loaded into the cartridge chamber,
This is a film drive system used in cameras that automatically sends the leading edge of the film coming out of the roller to the stool and starts pre-winding. It is composed of a frame advance system, a counter system, a mode changeover switch section for switching between a pre-winding mode and a shooting mode for rewinding, and an electric circuit that limits these means.

[Film drive system]

The film drive system meshes with a drive motor 2 disposed inside one spool 1, an output gear 6 attached to an output shaft 4 of the drive motor 2, and an output gear 6, as shown in FIG. 1 in pre-winding mode. It includes a reduction gear train 8 . The film drive system also includes a torque sensing lever 12 coaxially supported by a first sun wheel 14 and a second sun gear 16 that are integrally mounted.
and a terminal member 18. The torque detection lever 12 is
The first planetary gear 11t that meshes with the first sun gear 14, the first arm portion 15 that is pivotally supported, and the torque detection lever 12 m1
It has a biasing element 24 that is engaged with a coil spring 26 for biasing rotation in the counterclockwise direction in the figure, and an operating arm 17 that engages with a mode locking lever 312 that will be described later. The arm member 18 pivotally supports a second idler Mta wheel 20, and the second idler gear 20 meshes with the drive gear 22 of the spool 1 in the preliminary winding mode shown in FIG.

In the above configuration, the drive motor 2 rotates counterclockwise in FIG. 1 to perform preliminary winding of the film. When the preliminary winding is completed, that is, when the film 34 is no longer fed out from f) the roller 32, the rotation of the spool 1 is stopped by the film 34. As a result, the rotation of the reduction gear train 8 is stopped, and the first planetary gear 1
1 moves in the clockwise direction in FIG. moves to the position shown by the imaginary line 20' in the ta1 diagram.

Subsequently, when the electric circuit is controlled to switch to the photography mode, the drive motor 2 rotates in the opposite direction to that in the preliminary winding mode. The film rewinding mechanism that operates in the shooting mode transfers the driving force from the reduction gear train 8 to the m1 planetary gear train 11. It is configured to communicate to a transmission gear train 30 via first and second sun gears 14, 16 and a gear 20 located at the position shown in phantom 20'. The last gear 36 of the transmission gear train 30 meshes with a cartridge drive gear 40 for rotating the winding 1dla8 of the arm trone 32. Further, one gear 42 of the transmission gear train 30 meshes with a counter drive gear 44 for driving a film counter system.

On the other hand, below the spool l and the film 34,
A film feeding device [50] is provided to feed the leading end of the film 34 to the stool 1 at the beginning of the preliminary winding mode. Send the film! i[50 is a gear 52 attached to the lower end of the spool 1, an idle gear 54 that meshes with the gear 52, a one-way gear device #56 that meshes with the idle gear 54, and an output gear 58 of the one-way gear device 56. Idle gear 60 and idle gear 6 that mesh with each other
and a drive belt assembly M62 driven by a motor.

The drive belt device 62 is configured to run parallel to the film 34 a portion of an endless belt 74 having a plurality of protrusions 72 that fit into the four-fold formations 70 of the film 34 . The one-way gear device 56 has an input gear 64 and an output gear 58 coupled via a one-way clutch 66.

In the above configuration, when the cartridge 32 is loaded into the camera and the preliminary winding mode starts, the drive motor 2 and the spool 1 rotate, and at the same time the drive belt device 62 feeds the film 34 to the spool 1.

Then, when the leading end of the film 34 reaches the stool 1 and the spool 1 winds up the leading end of the film 34 by a device (not shown), the film 34 is wound up by the stool 1 without being restricted in any way by the drive belt device 62.

[Frame feeding system]

The frame feed system rewinds the film by one frame each time it is taken, and when pulling out the film from the cartridge and cutting it, the exposure position of the first film is adjusted by approximately one frame or more to avoid cutting the image. This is to feed the film in order to move it away from the cartridge, and to output the number of film runs to the counter system, as shown in Figure 2. The sprocket shaft 100 has a sprocket shaft 100 that is pivotally supported by a shaft (not shown), and a sprocket 102 that is fixed to the lower end of the sprocket shaft 100. The sprocket 102 is arranged so as to engage the arm-to-leg of the loaded film, and the sprocket 1111100 is rotated to follow the travel of the film.

The operating mechanism of the air-fed 9 switch S is the sprocket 102.
a cam member 104 fixed to the upper surface of the cam member 104;
The swing arm device 106 engages with the swing arm device 106. The swinging arm device 1106 includes a first swinging member 110 which is pivotally supported by a pin 107, is urged to rotate clockwise in FIG. , is pivotally supported by a pin 105 on one arm portion of the first swinging member 110, and has a coil spring 112.
The second swing member 114 is biased to rotate in the counterclockwise direction in FIG.
Switch connection piece 11 fixed to the other arm of 10
It consists of 6. The swing arm device [106 is the cam member 10
4, when the first swinging member 110 is not swinging, the coil spring 108 and the arm pin 111 urge the switch connection piece 116 to be positioned above the air feed switch S, and the air feed switch S, becomes ON.

In the above configuration, in the preliminary winding mode in which the sprocket 102 rotates counterclockwise in FIG. It only swings around the pin 105 on the member 110, but the first swinging member 110#'i does not swing, and the switch connecting piece 116 is connected to the O of the idle feed switch S1.
Hold N.

On the other hand, in the shooting mode, if the second swinging member 114 is swinging by the cam member 104, first, as the cam member 104 rotates clockwise in FIG. The swinging movement of the moving member 114 is at /f11.5
It is fixed to the swinging member 110 by engaging with.

As a result, by the subsequent clockwise rotation of the cam member 104, the m1 swing member 110 is rotated counterclockwise in FIG. 2 via the second swing member 114, and the 1@switch So Immediately before turning OFF, the switch connection piece 116 separates from the pneumatic feed switch S, and the pneumatic feed switch S turns OFF.
It becomes F.

That is, at the time when the preliminary winding mode ends, the cam member 104 swings the second swinging member 114 clockwise in FIG. 2, that is, the second swinging member 11
4 is not locked by the stopper pin 115 but is locked by the cam member 104, even if the cam member 104 initially rotates clockwise in FIG. 2 due to the next shooting mode, The second swinging member 114 only swings with respect to the first swinging member 110 to a position where it engages with the stop horn mother pin 115 by the coil spring 112.
The swinging member 110 is not swung, and the idle feed switch S1 is kept ON.

Then, the cam member 104 rotates approximately once and iE2. It is not until the first swing member 110 is rotated counterclockwise in FIG. 2 via the i-movement member 114 that the air feed switch S
Turn off. Therefore, at the beginning of the photographing mode, the sprocket 102 rotates at an angle exceeding approximately one turn, more precisely at an angle at which the second rocking member 114 swings (approximately 300 degrees) at which the first swinging member 110 swings. After the film has been rotated by an angle of +°), that is, the film has been rewound by approximately one frame, the blank feed switch S is turned off.

On the other hand, when the second swinging member 114 is not swinging by the cam member 104, the first swinging member 110 moves in the opposite direction in FIG. 2 as the cam member 104 rotates clockwise in FIG. It is rotated clockwise, and just before the 1-piece switch SQ is turned OFF, the switch connection piece 116 is separated from the feed switch S1, and the air feed switch S is turned OFF.
It becomes F.

1 piece switch S. The operating mechanism is arranged on the sprocket shaft 100 so that the operating arm 122, which is biased to rotate counterclockwise in FIG. It consists of four parts 120 provided. 1 piece switch S. teeth,
When the protrusion 124 falls into the recess 120, the operating arm 1
The engagement with the protrusion 12 is disengaged and the switch is turned off, while the protrusion 12
4 is in contact with the outer surface of the sprocket 1141100 other than the concave @120, the operating arm 122 is a single-piece switch S. Turn on. Therefore, 1 piece switch S. is 1
It is turned off every time a frame of film is fed and the sprocket shaft 100 rotates once.

Note that in the above configuration, the idle feed switch S.

operating mechanism and one-piece switch S. In the operating mechanism, in the shooting mode, that is, when rewinding the film, the time when the air feed switch S is turned off is the same time as the time when the single frame switch S1) is turned off, as described above. 1 piece switch S. is adjusted so that the timing at which it turns off is slightly delayed. Therefore, in this embodiment in which the air feed 9 switch S and the 1-frame switch So are wired in parallel, the time when the parallel wiring is turned off during shooting is the 1-frame switch S. This is no different from when the switch is turned off.

Therefore, in the above configuration, if the second swinging member 114 is swinging by the cam member 104 at the time when the preliminary winding mode ends, the first one-frame switch S
The OFF of Q is disabled by the ON of the blank feed switch S, and the film for (1 frame 10 α) is rewound by the electric circuit described later. Meanwhile, at the same time, the second
When the swinging member 104 is not swinging by the cam member 10, the blank feed switch S1 is also turned off immediately before the one-frame switch So is turned off, so that rewinding by approximately one frame is performed.

The Komagome-type film running number output mechanism has a small diameter portion 130 provided at the upper end of a sprocket shaft 100, on which the film counter drive gear 44 shown in FIG. A counter gear 132 is solidly mounted on the upper end, and a spring 134 is disposed between the film counter drive gear 44 and the counter gear 132 to form a friction clutch. Film counter drive gear 44 provides driving force for sprocket shaft 100.

[Counter system]

As shown in FIG. 3, the counter system includes the counter gear 132 shown in FIG. Integrated and idle gear 2
02 and a counter plate 210 having a gear 208 on its outer periphery that meshes with the one-tooth rotating member 204. The counter feed gear 206 has pin 2
12 and is supported by a swinging member 352 which is biased counterclockwise in FIG. 6 by a coil spring 350. Therefore, when the counter plate 210 is locked by the stopper pin 216, the 1 m rotating member 204 can idle relative to the counter plate 210. A bottle 214 is installed on the lower surface of the counter plate 210, and a stopper pin 216 is installed on the camera side (not shown).
16, the initial position C of the counter plate 210, which indicates E, ie, no film, is determined.

In the above configuration, the display on the counter changes by one each time the film is advanced by one frame in both the preliminary winding mode and the photographing mode.

[Mode changeover switch section]

The mode changeover switch section is shown in Figures 4 to 6. Figure 4 shows the pre-winding mode, Figure 5 shows the shooting mode, and Figure 6 shows the mode when the cartridge is removed. This shows a state where the shooting mode changes to the pre-winding mode.

・The loading and unloading υ of the mother Torone 32 are as shown in Figure 6, camera? 10 of the loaded mother trone 32.
On the 11th side, there is provided an arm draw tree passage detection lever 304 which is pivotally supported by the bottle 302. A swinging lever 308 is pivotally supported at the upper end of the main draw wood passage detection lever 304 via a bottle 306, and the swinging lever 308 is supported by a spring member 310.
4 in the clockwise direction in FIG.

A protrusion 3 is provided at the bottom of the mother torone passage detection lever 304.
12 are provided, as shown in FIG. ? ) When loading and dispersing the Rohne 32, the protrusion 312 is ? The lever 304 comes into contact with the trolley 32 and is pushed away and rotated clockwise in FIG.

The mode changeover switch section is further configured as shown in FIGS. 4 to 6.
As shown, it includes a mode selector switch 400 and a generally L-shaped mode selector switch 406 which is pivotally supported by a pin 402 and biased counterclockwise in FIG. 4 by a coil lever 404.

The mode switching lever 406 is the mode switching switch 40
It consists of an 8g lever part 407 that presses 0, and a second lever part 409 of 1ill opposite to this. The mode switching lever 406 is rotated between a shooting mode position where the first lever part 407 presses the mode switching switch 400 to connect to the shooting mode, and a pre-winding mode position where the 2-mode switching switch 400 is released and the pre-winding mode is connected. move.

A protrusion 408 is provided at the tip of the lever fls407, and a protrusion 416 of a locking lever 410 can engage with the protrusion 408 in the preliminary winding mode position. Locking lever 4
10 is pivotally supported by a pin 412 and a coil spring 414
The opposite end of the locking lever 410 to the protrusion 416 is biased clockwise in FIG.
-12 working arms 17 are configured to engage.

Mode switching lever 406 year 2 L/bar flB 4
09 is pivotally supported by the bin 420 and has a coil nozzle (the screw 4).
22 engages the lower protrusion 426 of the charge lever 424 which is biased counterclockwise in side 4 view. A protrusion 427 at the end opposite to the lower protrusion 426 of the charge lever 424 is configured such that the upper end of the swinging leno<-aos6 comes into contact with it.

In the above configuration, the nosotrone 32 is
When K is loaded, as shown in FIG. 4, the locking lever 410 locks the switching lever 406 in the pre-winding mode position, and the mode changeover switch 400 is connected to the pre-winding mode.

When the back cover is closed, a back cover switch S, which will be described later, is turned on and preliminary winding is automatically performed.

When the preliminary winding is completed and the rotation of the spool 1 is stopped by the film 34, the torque detection lever 12 rotates clockwise in the figure as shown in FIG. rotate counterclockwise. As a result, the locking lever 410 and the mode switching lever 4
06 is released, and the mode switching lever 406 is moved to the mode switching switch 40 by the biasing force of the coil spring 404.
0 is the shooting mode connection◎ In this shooting mode, as described above, 1@ worth of film is sequentially rewound into the cartridge 32 for each shooting. Further, even if the back cover is opened by mistake in the photographing mode, there is no change in the mechanical configuration of the mode changeover switch section, and the photographing mode is maintained as long as (4) the Ronne 32 is not removed.

On the other hand, when all of the loaded film has been photographed and all of the film has been rewound to the arm trone 32, the rotation of the drive motor 2 is stopped under the control of an electric circuit, which will be described later. At the same time, the torque detection lever 12 is rotated counterclockwise in the figure by the action of the coil spring 26, as shown in FIG.
The locking levers 410 are rotated clockwise in the figure by the action of the coil springs 414, and the locking levers 410Fi
The mode switching lever 406 is moved to a pre-winding mode position where tfK can be locked.

Furthermore, open the camera back and check the i'? ) When the Rohne 32 is removed, the swinging lever 308 is swung clockwise in FIG. 6, and the charge lever 424km is pivoted counterclockwise in FIG. 6. This is K] Mode switching lever 4
06 is moved to the preliminary winding mode position, the mode changeover switch 400 is connected to the preliminary winding mode, and the locking lever 410 locks the mode changeover lever 406 in the preliminary winding mode position.

〔electric circuit〕

As shown in Fig. 7, the electric circuit includes a power source E, a back cover switch Sc1 that turns on and off when the cover is opened and closed, a drive motor 2, a relay RL and a relay switch RLS, a mode changeover switch 400, and a film. A first film detection switch SF that is turned on when the film is on the road and acts to disable the operation of a counter switch S, which will be described later.
1. The first contact point F, depending on the presence or absence of the film on the travel path.
Film detection second switch SF2 switched to second contact S
, empty feed switch S, , counter switch S5 which turns on between I and E, initial switch sH2 which holds the initial state of frame feeding, and one-frame switch s (1, including back cover switch S0, relay RL and relay Switch RLS.

The initial switch SO and the counter switch SE are the first
Not shown in Figure 6. The first film detection switch SF and the second film detection switch SF2 are
As shown in FIG. 1, it is operated by a lever 500 that is slid by a film 349.

In the above circuit, when opening the back cover to load the cartridge 32, the mode switching lever 406 is normally charged by the previous removal of the cartridge 32, and the mode switching switch 400 is connected to the pre-winding contact R. , and the second film detection switch SF2 is connected to the second contact S.

Next, when the ) f trone 32 is loaded, the film is placed on the film travel path, and the back cover is closed, the back cover switch S is turned on, and the first film detection switch SF detects the presence of film and is turned on. Similarly, the second film detection switch SF2 is connected to the first contact F. As a result, the current flows through the camera back switch Sc and the IJ relay switch RL.
S normally closed contact NC.

Drive motor 2, film detection second connected to preliminary winding mode contact R1 first contact F of mode changeover switch 400
Switch SF2 and ON film detection first switch S
F, and pre-winding is performed.

0 When the preliminary winding is completed, the film stops rotating the spool 1, so the torque detection lever 12 rotates clockwise in FIG. 1, rotates the mode locking lever 410 counterclockwise, and the mode Rotate the switching lever 406 to the shooting mode position and press the mode switching switch 40025i.
Connected to photographing contact T. On the other hand, as mentioned above, the air feed system switch S1 is ON at this point, so the relay RL connects the relay switch RLS to the normally open contact No. The current flows through the motor 2 and the normally open contact NO of the relay switch RLS, and the drive motor 2 rotates in the shooting mode direction, and is driven when the air feed 9 switch S1 is turned OFF and the 1 frame switch Sg is turned OFF. The motor 2 stops, the blank feed ends, and preparations for photographing the first frame are completed. Thereafter, by turning on the 1-frame switch S, one frame of film is fed each time a photograph is taken.

Even if the camera back is accidentally released in this shooting mode, there will be no change in the mechanical configuration of the mode changeover switch section as described above, and the electrical circuit connections will not change except for the camera camera back switch SC being turned OFF. By closing the back cover again, the J&lid switch Sc is turned on, the circuit connection for the photographing mode is established, and photographing can be continued again.

Again, if the film counter of this camera is configured to return to zero when the back cover is opened,
1 because the counter switch SE is turned on when the back cover is opened and the first film detection switch SF1 is also turned on.
The frame switch So and the air feed switch S are disabled, and when the back cover is closed again, all remaining films are rewound to the cartridge 32, and the shot film is protected.

In this embodiment again, when the shooting progresses and the last frame of the film has been shot and the counter switch SE is turned ON, the 1-frame switch is activated by the ON counter switch S and the first film detection switch SF. S. and air feed switch S, are disabled, and the first film detection switch SF is turned off, that is, all the films are rewound to the roll and no longer exist on the film travel path. The film is rewound until the end.

When there is no longer any film on the film travel path, the first film detection switch SF is turned off (9), and the second film detection switch SF2 is connected to the second contact S.

As a result, the rotation of the motor 2 is stopped, and the relay switch RLS is connected to the normally closed contact NC.

Next, when the back cover is opened and the arm trone 32 is removed, the arm trone 32 rotates the arm trone passage detection lever 304 clockwise in FIG. bar 3
08, the charge lever 424 is rotated counterclockwise in the same figure, and then the mode switching lever 406 is rotated clockwise in the same figure to enter the preliminary winding mode position.
, this position is locked by the locking lever 410. The mode changeover switch 400 is a mode changeover lever 406
and is connected to the pre-winding contact R.

In this state, when the back cover is closed again after removing the mother trone 32, both terminals of the drive motor 2 are connected to the mode selector switch 400 connected to the preliminary winding contact R. Since the drive motor 2 is connected via the second film detection switch SF2, which detects the absence of film and is connected to the second contact S, and the relay switch RLS, which is connected to the normally closed contact NCIC, the drive motor 2 does not rotate. do not have.

Next, if you perform a shirt release (that is, aerial copying) with the Torone 32 not loaded and the camera back closed, the initial switch SH for holding the initial state of the Komagome lens will turn OFF.
N, the relay RL connects the relay switch RL8 to the normally open contact NOK. As a result, the current flows through the back cover switch Sc
,, flows through the second film detection switch SF2 connected to the second contact S, the mode changeover switch 400 connected to the pre-winding contact R, the drive motor 2, and the relay switch RLS connected to the normally open contact No. . That is,
Although the mode changeover switch 400 is connected to the preliminary winding contact R, current flows through the drive motor 2 in the same direction as in the photographing mode.

Accordingly, the drive motor 2 rotates in the photographing mode direction, that is, clockwise in FIG. become. Then, the frame feed system is activated by being rotated by the force meter drive gear 44 or one of the gears 42 of the transmission gear train 30, and the 4-piece switch So, in which the sprocket 102 has been rotated by one frame, is turned OFF. The relay switch RLS becomes a normally closed contact NC and the drive motor 2 stops. On the other hand, when the camera back is opened, a 9 Torrone is loaded, and the film is placed on the film travel path, the first film detection switch SF1 is turned on. ON, Gai Tona and film detection second switch S
F2ρ1 is connected to the second contact F. Therefore, current is supplied to the relay switch RLS connected to the normally closed contact NCK of the back cover switch S1, the drive motor 2, and the mode changeover switch 400 connected to the pre-winding contact R. ! The current flows through the second film detection switch 5F2- connected to the 22nd contact F and the first film detection switch SF1 which is ON, that is, the current in the pre-winding mode flows to the drive motor 2, thereby performing pre-winding.

〔Effect of the invention〕

As described above, when the camera back is closed without a mother trone loaded into the camera, the first film detection switch disables the counter switch, and the second film detection switch switches the mode. The operation of the switch is disabled, and the drive motor is essentially connected to the shooting mode, causing the shirt release and stroke? It has the effect of emitting light.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a film drive system according to an embodiment of the present invention, Fig. 2 is a perspective view of a frame feed system, Fig. 3 is a perspective view of a counter system, and Figs. 4 to 6 are mode changeover switches. Fig. 4 shows the preliminary winding mode, and Fig. 5 shows the preliminary winding mode.
The figure shows the photographing mode, FIG. 6 shows the state in which the photographing element is changed to the preliminary winding mode by removing the mother trane, and FIG. 7 is an electric circuit diagram of the embodiment. 1... Stool, 2... Drive motor, 12... Torque detection lever, 14.16... Sun gear, 32...
・Patrone, 50...Film feeding device, 60...
・Drive belt, 100...Sprocket shaft, 304・
...No mother trane passage detection lever, 400...Mode switching switch, 406...Mode switching lever, 4
10...Latching lever. 8 312 Tan 5 Figure 1K 6 Figure

Claims (1)

[Claims] After loading the film and prior to shooting, the pre-winding mode is where the film is continuously wound onto the spool, and after the pre-winding is completed, the mode changeover switch is used to switch to the shooting mode where the film is rewound one frame at a time to 9 trones while shooting. In a winding camera, by detecting that there is no film force in the film travel path, the counter switch, which is turned ON at the count position from the last frame to the position where all the film has been rewound to the armpit, is disabled. 1. An aerial photography device for a pre-wound camera, comprising a first film detection switch for disabling operation of the mode changeover switch, and a second film detection switch for disabling the mode changeover switch.