JPS5816221A - Automatic winding device of camera - Google Patents

Abstract

PURPOSE:To prevent a film end from being detected erroneously, and to reduce power consumption, by providing a latency time switching means, and varying the latency time length of said means. CONSTITUTION:When there is a great difference in the time from the starting of film feeding to the ending of winding owing to a difference in the kind of a film, for example, when the drawing-out torque of a film is large, the time from the starting of film feeding to the generation of a winding completion signal is set long with a changeover switch 6 to lower the possibility that a part other than a film end is recognized as the film end erroneously. When the drawing-out torque of a film is small, the latency time is set short to reduce the power consumption even if the film is tensed at its film end.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic film winding device for a camera, and relates to an automatic film winding device for a motor-driven camera, in which the film winding operation and the shutter release operation are reversed by <9 by electric drive.

In conventional automatic film winding cameras, this signal is used to start the next winding operation.

Generally, the film winding operation by this motor is completed in a substantially constant time, and upon completion of this winding operation, a winding completion signal is generated and the next operation is started.

In cameras where the automatic winding operation of the camera is performed by a built-in motor or an external motor drive device, when the film winding operation is completed, the motor is mechanically rotated with the drive current flowing. Since the motor is stopped, if this state continues for a long time, the power consumption of the motor will increase, which will not only increase the consumption of the power supply battery, but also cause the motor and battery to generate heat, which is inconvenient and can cause failure. It is.

This kind of situation generally does not occur when the motor is operating the cameral under normal conditions, and the winding completion signal is not received even after a certain period of time has passed after the motor started the winding operation. Various methods have been proposed to prevent the above-mentioned problems, but an example of such methods is as follows: However, if the winding completion signal is not output, the power supply to the motor is automatically cut off or the motor is moved to the next operation, and a display device, such as a light emitting diode, is used to warn of this condition. This is what I did. In conventional cameras configured in this way, if a film winding completion signal is not issued within a certain amount of time from the start of film winding, the film automatically moves to the next sequence operation, but the film winding is stopped during the time before moving to the next sequence operation. Since it is kept constant from the time when the start signal is generated, if the film unwinding torque is large or the power supply voltage drops and the winding speed decreases, the generation of the winding completion signal will be delayed from the above fixed time. In some cases, the warning signal as described above is generated even when the film is not finished, and the automatic winding operation shifts to the next operation, for example, the automatic rewinding operation, in the middle of winding.

The present invention is intended to eliminate the drawbacks of the conventional device as described above, and is intended for use in a camera that automatically winds the film by an electric drive.
If the winding completion signal is not output after the start of winding, the circuit is switched depending on the operating conditions of the camera to determine the time it takes to move on to the next operation. Even if the pull-out torque is different or the torque changes due to temperature changes, etc., by changing the setting time, you can change the setting time from the start of winding to the next one! By appropriately setting the time until the transition to operation, the winding completion signal is always obtained at times other than when the film is finished, and the motor does not stop for a long time to avoid excessive power consumption. This was done to prevent it from happening.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a circuit connection diagram showing an embodiment of an automatic winding device according to the present invention. [Sequence controller in Figure 1] sequentially controls the operating modes of the camera, and when the camera enters the hoisting mode, it gives a motor energization signal to the hoisting circuit 2 including the electric motor. The switch 7 is closed when winding is started, and is opened when winding is completed, and is a switch for giving a winding completion signal B to the sequence controller 1.

The winding completion signal B is connected to the -C power supply VDD through a resistor 9. Further, the sequence controller 1 gives a reset signal 0 to the counter 3. When the reset is released by the signal 0 from the circuit 1, the 0 counter 3 counts the clock signal from the clock failure circuit 4, and outputs the count output E and Outputs count output F. switch 6
is a switch for changing the time from the start of film feeding to the next operation. The contact piece 6a of the switch 6 is grounded,
The contact piece 6b is connected to the power supply VDD through a resistor 8. The input of the inverter 1o is connected to the contact piece 6b.

The AND gate 11 receives the output of the inverter 10 and the count output E of the counter 3 as inputs. and gate 1
2 inputs are the contact piece 6b and the counter 30 count output F. The OR gate 13 inputs the output of the AND gate 11 and the output of the AND gate 12 manually. The output H of the mere gate I3 is input to the sequence controller 1. FIG. 2 is a timing chart for explaining the operation of the circuit shown in FIG.

The operation shown in FIG. 1 will be explained in more detail below according to the timing chart shown in FIG. When the continuous winding operation is performed normally, as shown in FIG. 2(a), the sequence controller 1 outputs the winding signal A to the winding circuit 2, and the reset signal 0 to the counter 3 is turned off. 0 counter 3 counts the clock signal from clock oscillation circuit 4, but in normal winding state, winding is completed before count output E and count output F are output from counter 3, so switch 7 is opened and winding is started. The completion signal B changes from the #L" level to the "H" level. This change actually includes chattering, so after absorbing the -to chattering, the sequence controller 1 turns off the winding signal and resets the counter 3. However, at the end of the film, when the winding completion signal remains at the #L" level, the counter output E is first output from the counter 3, as shown in FIG. 2(b). At this time, the switch 6 is opened and Then, the input of the inverter 100 is grounded through the switch 6, and becomes 'L level.Therefore, the output of the inverter 10 becomes the "H" level.As a result, the two inputs of the AND gate 11 both become "H#", and the counter output from the AND gate 11 becomes "H" level. Output E is outputted and sent to the sequence controller 1 via the OR gate 13. Sequence controller 1 (or game) 130 When the output H reaches "H level", the film end (
When it is determined that the film has ended (the film has ended), the winding signal is turned off and the counter 3 is reset. Further, when the switch 6 is open, the power of the inverter 100 is pulled up to the power supply VDD through the resistor 8, so it becomes the #H" level, and the output of the inverter IO becomes the #L# level.

Therefore, as shown in FIG. 2 (0), the counter output Ed7
There is no output from the gate 11. Next, when the count of the counter 3 progresses and the counter output F is output, since the ant game (12) is selected by opening the switch 6, the counter output F is sent to the sequence controller via the AND gate 12 and the OR gate 13. 1. Similarly to the sequence controller net (FIG. 2), the winding signal is turned off and the counter 3 is reset.

As described above, in the embodiment shown in the first diagram, when the winding completion signal is not obtained at the end of the film, the time from the start of film feeding until the winding is stopped can be shortened or extended by turning the switch 6 on or off. It will be switched. Furthermore, by making the switch 6 a switch linked to the film counter, the time can be changed to a long time at the beginning of the film to prevent false film end warnings and automatic film rewinding. It goes without saying that by providing a plurality of switches 6, it is possible to set the time in three or more stages.

Next, FIG. 3 is a circuit connection diagram showing an embodiment of the pond of the present invention. The same parts in the figure as in FIG. 1 are designated by the same reference numerals [7
It is. In the figure, a winding completion detection device 5 provides a winding completion signal B to the Seacare X-1 controller 1 indicating that winding has been completed by film feeding.

The comparator 21 supplies the power supply voltage v to the drive motor.
M is compared with a reference normal pressure V⇠HP obtained by dividing the foot voltage KVO by the resistors 22 and 23. The comparator 21 outputs resistors No. 7 OKi and OK2. Note that the synchronization of OK2 is set longer than the cycle of OKr. In the circuit shown in the figure, the sequence controller 1 outputs the signal A for hoisting, and when the signal A is sent to the counter 3 and the serator g is released, the power supply voltage VM changes to the reference voltage Vl(f(f(F'). , the output of the comparator 21 is at the '1-■' level, so the AND gate 26 is selected, and the clock signal OKi is connected to the AND gate 26 and the OR gate VRE.
I? j If Ct is low, the output of the comparator 21C) becomes "L# level", so the output of the inverter 25 becomes #H"
level, and the AND gate 27 is selected, and the -C clock signal OK2 is output to the AND gate 27 and the OR gate 28.
Since the period of OK2 is longer than the period of the 0 clock signal OKi which is input to the counter 3 via the clock signal -C, when the power supply voltage VM is low, the output H of the counter 3 is ``/''/ The time it takes for the film to reach the HI'V level is short. Therefore, it is possible to prevent erroneous film end detection due to the lengthening of the winding time when the power supply voltage drops.

As described above in detail with respect to the embodiments, in the present invention, by varying the waiting time from the start of film feeding until the winding completion signal is obtained, the following effects can be obtained. Depending on the difference between the 4 types - [
If there is a large difference in the time from the start of film feeding to the winding completion signal, for example when the film has a large pull-out torque, the wait time from the start of film feeding until the winding signal is obtained may be longer. By doing this, the probability that something other than the film end will be mistaken as the film end is reduced. Also, when the pull-out torque of Fill J is small, you can switch the waiting time to a shorter one.
Even when the film is stretched at the end of the film, less power is consumed.

2. Interlocking with the film feeding counter t, -c By changing the waiting time from the start of film feeding until the winding completion signal is obtained, erroneous recognition of the end of the film does not occur in the early stages of film winding. For example, if the number of films being fed is 10 or less, it is not normal to tension the film at the end, so it is best to wait long enough from the start of film feeding until the winding completion signal is obtained. become.

3. If the power supply voltage drops below a certain level due to low temperatures or wear and tear, film winding will start from the start of film feeding.
By increasing the amount of time it takes to wait for a completion signal,
This device can provide many effects such as 0, which can prevent the film end from being mistakenly recognized, and can be made into a device that can achieve great effects with a simple circuit configuration.

[Brief explanation of the drawing]

FIG. 3 is a circuit connection diagram showing another embodiment of the present invention. 1... Sequence controller, 2... e upper circuit,
3... Counter, 4... Clock signal excavator, 5
...Hoisting completion detection circuit, 6...Waiting time changeover switch, 7...Hoisting switch, 8, 9, 22, 23.2
4... Resistor, 10.25... Inverter, 11.
12゜26.27...AND gate, 13.28...
・OR Gate, 21... Kono Valley Me. vZ2 (Ku) (Sh) Ha - -1 (C) A , -1 1 ----Lo H-"' -+ 129-

Claims (1)

[Claims] (1) In an electric drive camera that performs a film winding operation etc. by electric drive, in an automatic winding device of a camera that moves to the next sequence operation in response to a winding completion signal after a winding start signal is generated, the winding camera moves after the winding start signal is generated. Automatic winding device O for a camera (2. Automatic winding device for a camera characterized by the above in the device described in claim (1) 0 (3) Claim fl), in which the circuit switching means is electrically operated. An automatic winding device for a camera, characterized in that the waiting time length is varied in relation to the drive power supply voltage.