JPH0733220Y2 - Film winder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Use The present invention relates to a film winding device used for a long film bag or the like.

B. Conventional Technology The long film back can be attached to the back of the camera body by replacing it with the back cover of the camera body, and is used to wind the long film wound around the supply side spool onto the winding side spool. It has a winding motor. Then, the winding motor is driven in response to the winding signal from the camera body side (which is output every time the photographing is completed) to wind one film frame.

In addition, this long film back is equipped with a take-up button that commands film take-up by manual operation, and when this button is pressed when shooting of all film frames is completed, the take-up motor is driven. Thus, the film is wound up to the end on the winding side spool.

C. Problem to be Solved by the Invention However, in the conventional winding device of this type, when the shooting is not completed up to the final frame, that is, when the end of the film is not separated from the supply side spool, the film is mistakenly wound. The film is wound even when the take-up button is operated, which may waste the film.

A technical problem of the present invention is to prohibit winding even if the winding button is operated when the end of the film is not separated from the supply side spool.

D. Means for Solving the Problems A film winding device according to the present invention is a film winding motor, which winds a film whose end is detachable from a supply-side spool from a supply-side spool to a winding-side spool. The end detection switch that outputs the end detection signal by detecting that the end has separated from the supply side spool after the end of the shooting of the last frame, the take-up switch that outputs the take-up signal when manually operated, and the end detection A winding control means for driving a winding motor so as to wind the entire film on the winding side spool by a logical product of the signal and the winding signal is provided, thereby solving the above technical problem. .

Further, in particular, the invention of claim 2 is provided with a clocking means for starting clocking of a predetermined time in response to a logical product of the end detection signal and the winding signal and outputting a clocking completion signal after the clocking is completed, and the clocking completion The winding control means is configured to stop the winding motor in response to the output of the signal.

E. Action The winding control means drives the winding motor by the logical product of the end detection signal and the winding signal, and winds the entire film on the winding side spool. This ensures that when the end of the film is not separated from the supply spool,
That is, when there are still frames that have not been photographed, the film is not wound even if the winding button is operated, and the film is not wasted.

Further, in the invention of claim 2, the winding control means is
The winding motor is stopped in response to the output of the timing completion signal from the timing means. As a result, the winding motor automatically stops after the winding is completed.

F. Embodiment An embodiment of the present invention will be described with reference to FIGS.

Figure 2 shows a long film back 60 on the back of the camera body 50.
It shows a state in which is attached. Inside the long film back 60, a supply side spool 61 and a winding side spool 62 are provided.
The long film FI wound around 61 is wound on the winding-side spool 62 one frame at a time for each shooting.

Also, this long film back 60 has two switch SW
1, SW2 is provided, switch SW1 (end detection switch)
Turns on when the trailing end of the film FI reaches the position of the point P away from the supply side spool 61, and outputs a trailing end detection signal when turned on. The switch SW2 (winding switch) is a switch that is turned on in conjunction with the pressing operation of the film winding button 63 provided on the upper portion of the long film back 60, and outputs a winding signal when turned on.

FIG. 1 is a circuit diagram showing a film winding device inside the long film back 60, and 1 is a power supply battery. Terminal
The DR is connected to the camera body 50 side and is normally set to a high level. When the exposure is completed on the camera body 50 side and an exposure completion signal is output, the terminal DR becomes low level.

Between the power line ₁ and the GND line ₂ , a film winding motor 11, a capacitor 12, PNP transistors 21, 22, 2
3, 24, 25, 26 and NPN transistors 27, 28, 29, 30 are respectively connected, and the winding motor 11 is driven when the transistor 26 is on and the transistor 30 is off. The take-up motor 11 rotates the take-up spool 62 in order to take up the film FI wound around the supply-side spool 61 on the take-up spool 62.

The line connecting the collector of the transistor 21 and the base of the transistor 27 is connected to the ground via the diode 41 and the termination detection switch SW1 described above, and is also connected to the one-shot multicircuit via the diodes 41 and 42 and the winding switch SW2. It is connected to the input terminal TRIG of the vibrator 31. When the switch SW1 is turned on, the base of the transistor 27 is connected to the ground via the diode 41, which turns off the transistor 27.

The input terminal TRIG of the multivibrator 31 is pulled up to the power supply voltage by the resistor 43, and when the switch SW2 is turned on while the switch SW1 is turned on, the input terminal TRIG becomes low level. This triggers the multivibrator 31. When the switch SW1 is off, the input terminal TRIG remains high level even when the switch SW2 is on.

The multivibrator 31 has the characteristics shown in FIGS. 3 (a) and 3 (b). That is, when the input terminal TRIG is changed from the high level to the low level, the output terminal VOUT becomes a low level to a high level, the output terminal VOUT and the predetermined time t _D has elapsed returns to the low level. The predetermined time t _D is set from the state in which the end of the film FI is located at the point P in FIG. 2 to the time when the film is completely wound up on the winding side spool 62 by the motor 11, and its value is the multivibrator.
It is determined by the time constant of the resistor 33 and the capacitor 32 connected to 31.

The output terminal VOUT is connected to the base of the NPN transistor 34, and when the output terminal VOUT becomes high level, the transistor 34
Turns on. The collector of the transistor 34 is connected to the bases of the transistors 22 and 24 described above, so that turning on the transistor 34 turns on the transistors 22 and 24.

Next, the operation of the embodiment will be described.

In the normal state, that is, when the film is not wound, the terminal DR is at high level and all the transistors 21 to 30 are off. Camera body 50 (Fig. 2)
When the exposure is completed on the side, the exposure completion signal is output and the terminal DR
Changes from high level to low level. This turns on transistor 21, followed by transistors 27,22,24,29,26.
Turn on in sequence. At this time, since the transistor 23 is turned on and the transistors 23, 28, 25, 30 are turned off, the winding motor 11 is driven and the film FI is wound on the winding side spool 62. At this time, the capacitor 12 is discharged by turning on the transistor 22.

When the camera body 50 detects that one frame of film FI has been wound, a winding stop signal is output and the terminal DR
Changes from low level to high level. This turns off transistor 21, followed by transistors 27,22,24,29,26.
Turns off. In addition, turning off the transistor 22 causes the resistance 13
The capacitor 12 is charged via the transistor, and a current flows through the base of the transistor 23 until the charging is completed, so that the transistor 23 is turned on, and then the transistors 28, 25, 30 are turned on. As a result, both ends of the winding motor 11 are short-circuited, and as a result, the motor 11 is braked and the motor 11
Stops. The above operation completes the winding of one frame of film. When the charging of the capacitor 12 is completed, the transistors 23, 28, 25, 30 are turned off again, which returns the circuit to the initial state.

Also, during the film FI winding operation described above, the film
When the terminal end of FI leaves the supply side spool 61 and reaches the point P (FIG. 2), the switch SW1 is turned on, a terminal end detection signal is output, and the transistor 27 that was in the on state is turned off. As a result, the transistors 22, 24 and 26 are turned off, and the motor 11 is stopped as described above. In this state, the take-up button 63 (second
When the switch SW2 is turned on and the input terminal TRIG of the multivibrator 31 changes from high level to low level, the output terminal VOUT changes to high level as shown in FIGS. 3 (a) and 3 (b). Become. This makes the transistor
34 turns on, followed by transistors 22, 24, 29, 26 turning on. Since the transistor 30 is off now, the motor 11 is driven. Output terminal of multivibrator 31 Output terminal when a predetermined time t _D elapses after VOUT goes high
Since VOUT becomes low level and the transistor 34 is turned off, the transistors 22, 24, 29 and 26 are turned off. When the transistor 22 is turned off, the capacitor 12 is charged and the transistors 23, 28, 25, 30 are turned on, and the motor 11 is braked and stopped. After that, the initial state is returned when the charging of the capacitor 12 is completed.

When the take-up button 63 is operated while the switch SW1 is off, the switch SW2 is turned on, but the input terminal TRIG remains at high level and the output terminal VOUT remains at low level. Therefore, the transistor 34 is not turned on and the motor 11 is not driven. That is, when the film FI is wound around the supply side spool, the film is not wound even if the winding button 63 is operated.

The circuit configuration for realizing the above operation is not limited to that of the embodiment. Further, for example, the above-mentioned both switches SW1 and SW2 and the winding motor 11 are respectively connected to a microcomputer, and the microcomputer detects that both the switches SW1 and SW2 are turned on and drives the motor 11 as well. The effect of is obtained.

Further, although the example in which the long film back 60 is used is shown above, the present invention is not limited to this, and the present invention can be applied to a camera adopting a preliminary winding method. The pre-winding method is a method in which after mounting the cartridge, the film is once wound up on the winding spool and the film is rewound one frame at a time on the cartridge shaft for each shooting. The shaft corresponds to the spool on the take-up side, and the leading end of the film corresponds to the end of the film. That is, the film may be rewound when the leading end of the film is separated from the winding spool by winding the last frame and the rewind button (rewind button) is operated.

G. Effect of the Invention According to the present invention, the logic of the end detection signal that is output when the end of the film moves away from the supply side spool and the take-up signal that is output when the film winding is commanded by manual operation Since the take-up motor is driven by the product, when the end of the film is not separated from the supply side spool, that is, when there are still frames that have not been photographed, the film can be operated even if the take-up button is operated. The film is prevented from being wasted because the film is not wound.

Further, in particular, the invention of claim 2 is adapted to measure the predetermined time in response to the logical product of the end detection signal and the winding signal, and to stop the winding motor in response to the completion of the timing. Therefore, when winding is completed, the winding motor automatically stops, and the battery is not wastefully consumed.

[Brief description of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a circuit diagram showing a film winding device of a long film back 60, and FIG. 3A and 3B are time charts showing the signal levels of the input / output terminals of the multivibrator 31. FIG. 21-30: Transistor 31: One-shot multivibrator 50: Camera body 60: Long film back 61: Spool on supply side 62: Spool on take-up side 63: Take-up button, FI: Film SW1: End detection switch SW2: Take-up switch

Claims (2)

[Scope of utility model registration request] 1. A winding motor that winds a film whose end is detachable from a supply-side spool from the supply-side spool to a winding-side spool, and the end is the supply after the end of photographing of the last frame of the film. An end detection switch that outputs the end detection signal by detecting the separation from the side spool, a winding switch that outputs a winding signal when manually operated, and a logic of the end detection signal and the winding signal. A film winding device, comprising: winding control means for driving the winding motor so as to wind all of the film on the winding side spool by stacking. 2. A winding means for starting timing of a predetermined time in response to a logical product of the end detection signal and the winding signal, and outputting a timing completion signal after completion of the timing, wherein the winding control means. The film winding device according to claim 1, wherein the winding motor is stopped in response to the output of the timing completion signal.