JP2532225B2 - Film feeding status detector - Google Patents

Description

Description: (a) Technical Field The present invention relates to a film feeding state detection device, and more specifically, when winding a film loaded in a camera by a motor, every one screen of the film. The present invention relates to a film feeding state detecting device for detecting a change in feeding state of the film.

(B) Conventional technology In a camera having an automatic winding mechanism that automatically winds a film of one screen by a motor after the exposure operation of the shutter is completed, conventionally, the film winding (feeding) of one screen is completed. The detection is performed by rotating the dummy sprocket by perforation of the film and counting the electric signals (pulses) output from a switch or the like interlocking with the dummy sprocket. And the detection of the end of the film winding, for example, the detection by the clutch switch utilizing the tension applied to the film and the rotation stop of the dummy sprocket is detected,
On the other hand, the detection of the end of film rewind has been detected by stopping the rotation of the dummy sprocket or turning on or off the film detection switch.

Particularly, when the end of film winding is detected by stopping the rotation of the dummy sprocket, that is, when the film end is detected by the presence or absence of a pulse generated by the dummy sprocket, no pulse is generated from the time when the winding operation is started ( It is necessary to have a standard for the time to reach the time when the dummy sprocket is judged to have stopped) and the rewind operation is started. In the past, the reference time used as the reference for this determination was fixed to a predetermined time in advance.

However, in order to set the reference time as in the conventional example described above, the rotational force of the motor, that is, the winding time, depends on whether the battery used in the camera is old or new (consumed state), the environmental temperature at which the camera is used, etc. Since it fluctuates greatly, a huge amount of basic data is required to determine the optimum reference time, and extremely complicated work including analysis work of these basic data is required. further,
It is impossible that even the reference time set in this way can meet all conditions.

If the reference time is shorter than the true reference time that is most suitable for the condition, as described above, the winding diameter becomes large and the stronger torque is generated by the motor when the battery is exhausted, the temperature changes, and especially near the film end. For example, even though the film end has not been reached yet, a malfunction occurs and the film moves from the winding operation to the rewinding operation, and the film that has been shot only halfway is rewound. This is extremely inconvenient.

On the contrary, if it is longer than the true reference time, it is possible to surely prevent the above-mentioned malfunction, but when the film reaches the film end, it takes a longer time than necessary from the winding operation to the rewinding operation. Since the drive current in the winding direction continues to be supplied to the motor during this period, problems such as overheating of the motor, exhaustion of the battery, and excessive load on the members constituting the winding mechanism such as gears and the film, etc. Occurs. In particular, these problems are serious when the battery used is new, that is, when the electromotive force is large.

(C) Purpose The present invention has been made in view of the above circumstances, and an object of the present invention is to realize a compact structure and a reduction in size and weight, and to reduce the influence of the exhausted state of the battery and the environmental temperature. In this way, the film winding operation can be accurately and smoothly transitioned from the film winding operation to the rewinding operation, regardless of the accidental or sudden fluctuation of the feeding load. You shouldn't move to the return operation,
It causes a malfunction that shifts to the rewinding operation and wastes the remaining unexposed film, or conversely continues to energize the motor unnecessarily for a long time from the time when winding is completed, damaging the motor etc. Another object of the present invention is to provide a film feeding state detection device that does not cause inconvenience such as wasteful draining of the battery.

(D) Structure In order to achieve the above-mentioned object, the present invention detects a change in the feeding state of a film loaded into a camera by a motor for each screen, and the feeding state of the film is detected. In the detection device, pulse generating means for generating a predetermined number of pulses as one screen of the film is fed, and rising edges of the predetermined number of pulses for receiving the output of the pulse generating means and And / or edge detection means for outputting an edge signal each time a falling edge is detected, and the output of this edge detection means is counted to count at least the last edge signal, and the one screen is supplied. Edge counting means for outputting a feeding end signal indicating the end of feeding, shutter operation end detecting means for detecting the end of the exposure operation of the shutter, and this shutter operation ON the motor receives the output from the completion detecting means
The motor O that turns off the motor in response to the feeding end signal
The N-OFF means and the feed end signal and the output from the shutter operation end detecting means for counting the time required to feed the one screen are received from the shutter operation end detecting means. A first timing means for resetting to an initial state at the same time, starting timing from this time, stopping the timing operation at the time of receiving the feeding end signal, and sequentially outputting the timing data; and the first timing means. Output and the feeding end signal, and at the time of receiving the feeding end signal, the first timing data required for feeding one screen before the screen is stored. The timekeeping data holding means for updating the timekeeping data from the first timekeeping means and holding it as the second timekeeping data, and the outputs from the edge detecting means and the shutter operation end detecting means are reset to the initial state at this point. At the same time, the second timing means for starting the timing operation from this time point and sequentially outputting the timing data as the third timing data, and successively comparing the third timing data and the second timing data, 3 is composed of timing data comparing means for outputting a determination signal when the timing data exceeds the second timing data by a predetermined amount or more, and motor polarity switching means for receiving the determination signal and switching the rotation direction of the motor. It is characterized by that. Less than,
The configuration of the present invention will be specifically described based on an embodiment.

FIG. 1 is a circuit block diagram showing an overall configuration of a film feeding state detecting device according to the present invention. In FIG. 1, 1 is a wind pulse generating circuit as a pulse generating means, 1a is a dummy sprocket, 2 is an edge detecting circuit as an edge detecting means, 3 is an edge counter as an edge counting means, and R in the edge counter 3 is Reset input terminal, 4 is a positive logic 2-input AND gate, and 5 is the number 1
00ns delay circuit, 6a and 6b are both positive logic 3 inputs
OR gate, 7 is a cycle timer as a first time measuring means,
8 is a data latch as a time keeping data holding means, 9 is a data switching circuit, 10 is an initial data holding circuit, 11 is a division timer as a second time keeping means, 12 is a digital comparator as time keeping data comparing means, and 13 is a positive signal. Logic 2 input OR
A gate, 14 is a T-type flip-flop (hereinafter simply referred to as "T-FF") as a motor polarity switching means, and 15 is a number 10
Delay circuit of 0 ns, 16a and 16b are both AND gates of positive logic 2 inputs, 17a and 17b are both OR gates of positive logic 2 inputs, 18 is a motor ON-OFF circuit as motor ON-OFF means, 19 is a motor drive A circuit, 20 is a film feeding motor, 21 is a shutter close detection circuit as shutter operation end detection means, 22 is a manual rewind input circuit for inputting a manual rewind operation instruction, 23 is a back cover close detection circuit, 24 is a frame counter, 25 is a switching circuit, 26 is a positive logic 2 input
It is an AND gate.

The dummy sprocket 1a rotates by meshing with the perforation of the film fed by the motor 20, and drives a switch or the like constituting the wind pulse generating circuit 1 to feed one screen of film substantially evenly. It is configured to generate two pulses. The output end of the wind pulse generation circuit 1 is connected to the input end of the edge detection circuit 2, the output end of the edge detection circuit 2 is connected to the input end of the edge counter 3 and the third input terminal of the OR gate 6b. It is connected. Of the output terminals TP1 to TP4 of the edge counter 3, TP4 is the pulse input terminal P of the switching circuit 25.
I, the first input terminal of the AND gate 4, the stop input terminal ST of the cycle timer 7, the latch input terminal L of the data latch 8 and the second input terminal of the AND gate 16a. The output terminal of the OR gate 6a is connected to the reset / start input terminal R of the cycle timer 7, the data output terminal DT of this cycle timer 7 is connected to the data input terminal DI of the data latch 8, and the data output of this data latch 8 is connected. The terminal DO is connected to the data input terminal D1 of the data switching circuit 9, and the data output terminal OUT of this data switching circuit 9 is the digital comparator 1
2 is connected to the comparison input terminal CM1 and the judgment output terminal CMP of the digital comparator 12 is connected to the first input terminal of the OR gate 13, the second input terminal of the OR gate 6b, and the third input terminal of the OR gate 6a. And the second input terminal of the AND gate 16b, the output terminal of the OR gate 13 is connected to the toggle input terminal T of the T-FF 14, and the non-inverting output terminal Q is connected via the delay circuit 15 to the first input terminal of the AND gate 16b. It is connected to the first input terminal and is connected to the polarity input terminal PCH of the motor drive circuit 19, the second input terminal of the AND gate 4 and the switching input terminal of the switching circuit 25.
Connected to HG and inverting output terminals are AND gates 16a and 26
Are respectively connected to the first input terminal and the second input terminal. On the other hand, the output terminals of the manual rewind input circuit 22 and the shutter close detection circuit 21 are connected to the first input terminal and the second input terminal of the OR gate 17b, respectively, and the output terminal of the manual rewind input circuit 22 is connected to the OR gate 13b. Is connected to the second input end of the OR gate 17b, the output end of the OR gate 17b is connected to the ON input terminal ON of the motor ON-OFF circuit 18, and the first input end of the OR gate 6b, the reset input terminal R of the edge counter 3 and It is connected to the second input terminal of the OR gate 6a. Also,
The output end of the back cover close detection circuit 23 that outputs a reset pulse when the back cover of the camera is closed is connected to the reset input terminal R of the frame counter 24 that counts the number of filmed images, and the pulse of the switching circuit 25. The output terminals P1 and P2 are the increment input terminals INC of the frame counter 24, respectively.
And the decrement input terminal DEC, the count output terminal KP is connected to the first input terminal of the AND gate 26, and AND
The output terminal of the gate 26 is the switching input terminal XG of the data switching circuit 9.
It is connected to the. The output terminal of the initial data holding circuit 10 is connected to the data input terminal D2 of the data switching circuit 9. The output terminal of the AND gate 4 is ORed through the delay circuit 5.
The output terminal of the OR gate 6b is connected to the reset / start input terminal R of the division timer 11, and the data output terminal DT of the division timer 11 is connected to the comparison input terminal CM2 of the digital comparator 12. It is connected to the. The output terminals of AND gates 16a and 16b are O
The output terminal of the OR gate 17a is connected to the first input terminal and the second input terminal of the R gate 17a, and the motor ON-OFF circuit 18
Connected to the OFF input terminal OFF of the motor ON-OFF circuit 18, the output end of the motor ON-OFF circuit 18 is connected to the control input terminal CTL of the motor drive circuit 19 and the stop input terminal ST of the split timer 11, The output end is connected to the motor 20.

Next, each signal output from each circuit will be described. (A) is a shutter close pulse output from the shutter close detection circuit 21 at the time when the shutter operation is completed, and (b) is a motor ON-OFF circuit 18. Motor ON-OFF signal which becomes L level when one pulse is applied to the OFF input terminal OFF and becomes H level when one pulse is applied to the ON input terminal ON,
(C) is a wind pulse output from the wind pulse generation circuit 1, and (d) is an edge signal output from the edge detection circuit 2 each time each rising edge and falling edge of the wind pulse (c) is detected. Edge pulse,
(TP1) is output when the first edge pulse (d) is input, and hereafter (TP4) is the count output pulse that is output when the fourth edge pulse (d) is input. In particular, (TP4) is a feeding end pulse as a feeding end signal, (e) is time counting data as second time counting data output from the cycle timer 7, and (f) is first time output from the division timer 11. (G) is a count 1 output signal which becomes H level only when the count value of the frame counter 24 becomes "1" and becomes L level at other count values, (h) is a comparison Judgment pulse as a judgment signal that becomes H level only at the instant when the time measurement data (f) input to the input terminal CM2 exceeds the reference data (l) input to the comparison input terminal CM1 (i)
And (i ′) are OFF pulses applied to the second input terminal and the first input terminal of the OR gate 17a, (j) is a motor drive signal for driving the motor, and (k) is from the manual rewind input circuit 22. Manual input pulse output when manual rewinding is desired, (l) is reference data input to the comparison input terminal CM1, and DP4 is delayed feed end in which the feed end pulse (TP4) is delayed by several hundred ns. Pulse, (Q) is a forward / reverse signal that indicates the motor forward rotation (film winding) at the L level, and a reverse rotation direction (same winding backward) at the H level, and () is the reverse forward / reverse in which the forward / reverse signal (Q) is inverted. The signal (DQ) is a delayed forward / backward signal in which the forward / backward signal (Q) is delayed by several 100 ns.

When the pulse signal is applied to the reset / start input terminal R, the cycle timer 7 and the division timer 11
At that time, the timekeeping data (e) and (f) are cleared to zero and the timekeeping operation is restarted, and the cycle timer 7 starts the timekeeping operation when the feeding end pulse (TP4) is applied to its stop input terminal ST. Stopped and timed data at that time (e)
When the motor ON-OFF signal (b) applied to the stop input terminal ST thereof becomes H level, the divided timer 11 stops the timing operation at that time and retains the timing data (f) at that time. It is configured.

The data latch 8 is the first timekeeping data required for feeding one screen before the one which is already held when the feeding end pulse (TP4) is applied to the latch input terminal L. Is configured to update the reference data (the content is time Twn- ₁ ) as time reference data (e) and latch it as new reference data. From the data output terminal DO,
The latched data is always output.

The data switching circuit 9 connects the data input terminal D2 to the data output terminal when the signal applied to the switching input terminal XG is at the H level.
When it is connected to OUT and is at L level, the data input terminal D1 is connected to the data output terminal OUT.
The initial data output from the initial data holding circuit 10 is set to 1 second in this example, and this initial data is always output.

The T-FF 14 is configured to reset the forward / reverse signal (Q) to the L level in the initial state and invert the output each time one pulse is input to the toggle input terminal T. The motor drive circuit 19 turns on the motor when the motor ON-OFF signal (b) applied to the control input terminal CTL is at the H level,
When the L level is OFF, and when the motor is ON, the forward / reverse signal (Q) applied to the extreme positive input terminal PCH is the L level, the motor 20 is normally rotated (winded up), and when the H level is the reverse rotation (winded). It is configured to be returned) to control the motor 20.

The switching circuit 25 connects the pulse input terminal PI to the pulse output terminal P1 when the forward / reverse signal (Q) applied to the switching input terminal HG is L level, and conversely when it is H level.
It is configured to connect PI to the pulse output terminal P2. The frame counter 24 has an increment input terminal IN
The count value is incremented by 1 each time a pulse is applied to C, the count value is decremented by 1 each time a pulse is applied to the decrement input terminal DEC, and the reset pulse is applied to the reset input terminal R. It is configured to clear the count value to zero at the point of time.

2 to 6 are timing charts showing operation waveforms of respective parts in FIG. 1, FIG. 2 shows a winding operation, and FIG.
The figure shows the automatic rewinding operation, FIG. 4 shows the manual rewinding operation, FIG. 5 shows the operation of the edge counter 3, and FIG. 6 shows the operation of the division timer 11. 2 and subsequent figures, the same or equivalent signals, times, and timings as those in FIG. 1 are designated by the same reference numerals as those used above, and a duplicate description will be omitted. Also, the number of film shots of the film used in this embodiment is 36, that is, a so-called 36-shot film.

In Figure 2-Figure _{6, T 0, T 2, T} 4, T 6 each photographing operation when the (shutter operation) is completed winding operation is _{started, T 1, T 3, T} 5, T ₇ is the time when the winding operation ends, T _{0 to} T ₁ are the first winding operation, T _{2 to} T ₃ are the second winding operation, T _{4 to} T ₅ are the third winding operation, and T ₆ to T ₇ indicates the period of the last 35th winding operation. Therefore, the photographing operation of the first image is performed before time T ₀ , T _{1 to} T ₂ is the second image, T _{3 to} T ₄ is the third image, and the middle is omitted and T ₇ to T are omitted. ₈ is the last
The period of the 36th image capturing operation is shown. ts is the half cycle of the wind pulse (c), t ₁ , t ₂ , t ₃ , t ₄ are the rising edges of the first, second, third and fourth edge pulses (d), respectively.
The TW indicates the feeding time for one screen (winding time in FIG. 2), and the subscripts indicate the number of shots. Therefore, TW ₁ is the feeding time of the first sheet, and TWn is the feeding time of the n-th sheet. However, in this embodiment, n =
36, and n = 35 in the periods T _{6 to} T ₇ .

T ₈ is the time to start the winding operation of the 36th sheet, T ₉ is the time to move from the winding operation to the rewinding operation, that is, the time to start the rewinding of the 36th sheet, T ₁₀ is the 35th sheet, and T ₁₁ is 34th, T ₁₂
Is the 1st sheet, T ₁₃ is the 0th sheet, that is, the point of starting rewinding of the drawing portion when initially setting the film, T ₁₄
Is the end of rewinding. td is a delay time of several 100 ns.

In FIG. 4 (a), T ₉ ′ indicates the start time of the manual rewinding operation, and T ₉ ′ to T ₁₀ ′ indicate the rewinding operation for one sheet (one screen).

FIG. 7 is a block diagram showing a configuration of an application example of the present invention. In the figure, 27 to 32 are display portions of the liquid crystal display that appear black when a voltage is applied. 27 is the Patrone room side,
28 is a winding side, 29 to 32 are display dots for displaying a feeding state, 33a to 33d are drive circuits of the liquid crystal display, 34 to 41 are so-called 3-state buffer gates having a high impedance state in output. And, the gate input terminal is H for 34 to 37.
The gate input terminals 38 to 41, on the contrary, are operated at the L level.
Although not shown, the winding-side display unit 28 is configured to blink when automatic loading, which will be described later, fails.

The input ends of the buffer gates 38 to 41 are respectively connected to the count output terminals TP1 to TP4 of the edge counter 3 in a one-to-one relationship, and the input ends of the buffer gates 34 to 37 are also connected to the count output terminals TP4 to TP1 in a one-to-one relationship. It is connected. The gate input terminals of the buffer gates 34 to 41 are T
The output terminals of the buffer gates of the pair of buffer gates 34 and 48, 35 and 39, 36 and 40, 37 and 41, which are connected in parallel to the non-inverting output terminal Q of the -FF14, are connected to each other and the liquid crystal display described above is provided. The drive circuits 33a to 33d of the liquid crystal display device are connected to the input terminals thereof, and the output terminals of the drive circuit 33a to 33d of the liquid crystal display device are connected to the display dots 29 to 32, respectively.

Next, the operation of this embodiment configured as described above will be described.

First, the winding operation will be described mainly with reference to Fig. 2. Before that, a preliminary explanation will be given. When the film is loaded into the camera and the back cover is closed, a reset pulse is output from the back cover close detection circuit 23 and the frame is detected. When the counter 24 is cleared to zero and the motor 20 for feeding the film is turned on for a predetermined time to automatically wind the film on the winding spool, the so-called auto-loading operation is executed. Increment 24 by 1 and set the count value to 1. At this time, since there is no change (flashing operation) on the winding side display unit 28 shown in FIG. 7, the operator knows that the preparation for photographing is completed. Then, when the release button is pressed, photometry, distance measurement, focus drive, etc. are automatically executed, and a series of photographing operations in which the shutter opening / closing operation is executed is completed. And when the shutter closing operation is completed
The shutter close pulse (a) from the shutter close detection circuit 21 at T ₀
Is output to start the winding operation of the first sheet.

That is, the shutter closing pulse (a) output at time T ₀ is input to the ON input terminal ON of the motor ON-OFF circuit 18 via the OR gate 17b and the motor ON-OFF signal (b) is input.
Becomes H level and the motor 20 starts to rotate in the film winding direction. On the other hand, the shutter closing pulse (a) simultaneously resets the edge counter 3 to the initial state, and starts the time counting operation of the period timer 7 and the division timer 11 via the OR gates 6a and 6b. The film is started to be fed by the rotational driving of the motor 20, and the dummy sprocket 1a meshed with the perforation of the film is rotated accordingly, and the wind pulse (c) is generated from the wind pulse generating circuit 1. The edge detection circuit 2 detects the wind pulse (c) every half cycle ts, that is, at times t ₁ , t ₂ ,
An edge pulse (d) is output at t ₃ and t ₄ . This edge pulse (d) is divided by OR gate 6b
Since it is input to the reset / start input terminal R of 11,
The time data (f) of the divided timer 11 is cleared to zero at t ₁ , t ₂ , and t ₃ , respectively, and the new time measurement is started again.

Next, the operation of the edge counter 3 will be described in a little more detail with reference to FIG. 5. At the time point t ₁ when the first edge pulse (d) is input, the count output pulse (TP1) is output and the second edge pulse is output. pulse outputs count output pulse (TP2) at time t ₂ when (d) is input, at time t ₄ when the fourth edge pulse (d) is inputted in the same manner, the feeding end pulse (TP4) Is output. In other words, it can be said that the edge counter 3 monitors the feeding of the film for one screen.

On the other hand, the clocked data (f) reset at every time ts is input to one comparison input terminal CM2 of the digital comparator 12, and now the T-FF14 is in the initial state, the forward / reverse signal (Q) is at the L level, and the inverted signal is inverted. Since the forward / reverse signal () is at H level,
The AND gates 26 and 16a are in the ON state, and the AND gate 4 is in the OFF state. Also, since the frame counter 24 has a count value of 1, the count 1 output signal (g) is at H level. Therefore, in the data switching circuit 9, since the data input terminal D2 and the data output terminal OUT are connected,
1 second of the initial data output from the initial data holding circuit 10 is input to the other comparison input terminal CM1 of the digital comparator 12 as the reference data (l) and is sequentially compared during T _{0 to} t ₄ , but it is normal. Since ts << 1 second when the film is being fed, the determination pulse (h) is not output. When the feeding end pulse (TP4) is output at time t ₄ , that is, at time T ₁ , the feeding end pulse (TP4) input to the pulse input terminal PI of the switching circuit 25 is output from the pulse output terminal P1. It is output and applied to the increment input terminal INC, the count value of the frame counter 24 is incremented by 1 and the count value = 2, and the count 1 output signal (g) becomes L level. As a result, in the data switching circuit 9, the data input terminal D1 and the data output terminal OUT are connected. Further, the feeding end pulse (TP4) stops the counting operation of the cycle timer 7 and the first time measured during T _{0 to} T ₁ output as the time measurement data (e).
The data feeding time TW ₁ is held in the data latch 8. At the same time, the feeding end pulse (TP4) is sent to the AND gate 16
Motor ON-OFF circuit 1 as an OFF pulse (i ') via a
8 is input to the OFF input terminal OFF to set the motor ON-OFF signal (b) to the L level to stop the motor 20. Then, the divided timer 11 stops the time counting operation by the motor ON-OFF signal (b) which becomes L level. This completes the winding operation of the first sheet. That is, the second film has been fed.

Next, when the release button is pressed again at an appropriate time point from T _{1 to} T ₂ , the above-described series of shooting operations for the second image is executed, and at time T ₂ , a shutter close pulse indicating the end of this shooting operation. (A) is output. The winding operation of the second sheet after this time T ₂ is almost the same as the winding operation of T _{0 to} T ₁ already described. The only difference is the reference data (l)
As described above, the feeding time TWn- ₁ one screen before is always used in the second and subsequent operations. However,
In the operation of the first sheet, since there is no data of the previous feeding time TWn− ₁ , the initial data TW = 1 second is used only for the first sheet.

Then, winding a second 35 th at T ₆ through T _7, i.e. the end of the 36 th of the film is fed, the release button is pressed at the appropriate time of T ₇ through T _8, 36 th Then, the shutter closing pulse (a) is output at T ₈ . However, in this example, it is assumed that there is no extra length in the film and the film fixed to the film core of the Patrone is in a slightly tensioned state.

Turning to FIG. 3, the shutter closing pulse (a) activates the periodic timer 7 and the division timer 11 at time T ₈ to activate the motor.
The ON-OFF signal (b) rises, the motor drive signal (j) rises to the forward rotation side, and the motor 20 tries to wind up the 36th sheet, but as mentioned above, there is no extra length at the end of the film. The film does not move because there is no Therefore, since the wind pulse (c) is not generated, T ₈ ~ as shown in Figure 2
TWn without split timer 11 restarting between T ₉
Until TWn− ₁ , that is, when TW ₃₆ > TW ₃₅ , T ₉
Judgment pulse (h) from the digital comparator 12 at
Is output. This judgment pulse (h) is input to the toggle input terminal T via the OR gate 13 to invert the output of the T-FF 14, and is also input to the period timer 7 and the division timer 11 via the OR gates 6a and 6b. Restart these. The determination pulse (h) input to the second input terminal of the AND gate 16b rises after the delaying forward / reverse signal (DQ) elapses the delay time td from the time point T _{9, and} thus the OFF pulse (i) is generated. There is no output and the motor 20 continues to rotate. Further, the data latch 8 holds the TW ₃₅ which is two previous clock data since the feeding end pulse (TP4) is not input at the time point T ₉ .

By inverting the output of T-FF14, the forward / reverse signal (Q) becomes H level and the forward / reverse forward / reverse signal () becomes L level, and both states are held. As a result, time point
At T _{9, the} motor drive signal (j) rises in the reverse direction and AND
The gates 16a and 26 are turned off, the pulse output terminal P2 is enabled in the switching circuit 25, the AND gate 4 is turned on, and the AND gate 16b is turned on after the delay time td as described above. The motor 20 starts reversing (rewinding) from time T ₉ , the film starts to be fed in the reverse direction, the dummy sprocket 1a also starts reversing, and the 36th rewinding operation starts. This dummy sprocket 1a
Because he stopped at time T ₇ to a position immediately fell stand for the second wind pulses (c), if it begins to rotate in the reverse direction, that from the time t ₁ immediately after the time point T ₉ rises become. Therefore, the split timer 11 is restarted each time T ₉ , t _{1 to} t ₄ . Then, time t ₄ is reached, that is, time T
_The feeding end pulse (TP4) is output at ₁₀ , and the period timer 7 is stopped at this point and the data latch 8 holds the feeding time TW required for winding the 35th sheet at T _{6 to} T ₇ . The data of ₃₅ is updated to the data of the feeding time TW ₃₆ ′ required for rewinding at T _{9 to} T ₁₀ , and the rewinding operation of the 36th sheet is completed. Then, the feeding end pulse (TP4) is AND
Cycle timer 7 as delayed feed end pulse (DP4) after td after time T ₁₀ via gate 4 and delay circuit 5.
To restart. Although this state is not shown in FIG. 3,
This is shown in FIG. 5 by replacing T ₀ with T ₉ and T ₁ with T ₁₀ . That is, time point t ₄ = T
_The division timer 11 is restarted at ₁₀ and the cycle timer 7 is restarted with a delay of td to start the rewinding operation of the 35th sheet.
The delay time td is several hundreds of ns, and the feeding time TWn is several hundreds of meters.
Since it is s, td never becomes the error of TWn. Also, T ₉
Because through T ₁₄ between the motor ON-OFF signal (b) holds the H-level split timer 11 will not be stopped.

As described above, the time T _{10 to} T ₁₁ is the rewinding operation of the 35th sheet, and the same applies to the 34th sheet, the 33rd sheet, ..., The second sheet and the rewinding operation, T ₁₂ to At T ₁₃ , the first sheet is rewound.
In other words, the film shot up to this point is T _{13 to} T ₁₄
Is the rewinding operation of the drawing-out portion of the 0th sheet, that is, the film wound on the spool (winding) side by the above-described autoloading. Split timer 11 at T ₁₃
Is restarted, and the cycle timer 7 is restarted with a delay of td from this, and the rewinding operation of the 0th sheet is started. And time t ₁
At, the above-mentioned drawer part has finished passing through the dummy sprocket 1a, and the dummy sprocket 1a stops. This time t ₁
Since the edge timer (c) is not input after that, the divided timer 11 restarted at continues the timing operation, and the sequentially output timing data (f) is the feeding time TW ₁ required for T _{12 to} T _13. If the reference data (l) is exceeded as', that is, T
When W ₀ ′> TW ₁ ′, the judgment pulse (h) is output from the digital comparator 12 at time T ₁₄ . The determination pulse (h) inverts the output of the T-FF 14 via the OR gate 13 and is input to the AND gate 16b. Time point T
_{At 14} , the normal / reverse signal (Q) falls, the reverse normal / reverse signal () rises, and the delayed normal / reverse signal (DQ) falls with a delay of td. Therefore,
OFF pulse (i) is input to the off input terminal OFF the motor ON-OFF circuit 18 through the OR gate 17a at time T _14, and a motor drive signal (j) to the OFF level to stop the motor 20. This completes the automatic rewinding operation.

Now, in the above description, when the 35th sheet of T _{6 to} T ₇ was wound up (that is, when the 36th sheet was fed), there was no extra length at the end of the film, and the film became tense. It is assumed that it is in a state, and the drawn-out portion of the film in T _{13 to} T ₁₄ has a length corresponding to the time point t ₁ , for example, T ₈ to
Describing T ₉ as a representative, the operation of the divided timer 11 from when the shutter close pulse is received at T ₈ to when the determination pulse (h) is output at T ₉ is as shown in FIG.
~ Mode 4 is classified into four modes. In mode 1, since the divided timer 11 is activated by the shutter closing pulse (a) at time T ₈ , the content TWn of the time measurement data (f) is TWn> TW
It operates until it becomes n− _1, and thereafter mode 2 is similarly activated by the first edge pulse (d), and modes 3 to 4 are activated by the second and third edge pulses (d), respectively. That operation shown in T ₈ through T ₉ of FIG. 3 corresponds to mode 1 in FIG. 6, the operation of the T ₁₃ through T ₁₄ of FIG. 3 can be seen to correspond to the mode 2. Modes 1 to 4 mean that the wind pulse (c) can be detected at the maximum in order to detect that the film has reached the end of winding in the winding operation, or in the rewinding operation, that the drawing portion has finished passing. ) Has a margin of less than 4 times the half cycle ts. In other words, in mode 1, there is no extra length at the end of the film, so the previous feeding time TWn-
If it exceeds ₁ , no unreasonableness will occur even if the rewinding operation is immediately started, and in the case of mode 4, there is an extra length corresponding to the time point ts × 3 up to the time point t ₃ at the end portion of the film. Therefore, it is rational to start the rewinding operation from the time point t ₃ when the feeding time TWn− ₁ is exceeded. conventionally,
Content of reference data (l) which is the reference for determination Since TWn- ₁ is fixed, at least the maximum time shown in mode 4 is absorbed in order to absorb the variation in extra length of the end portion of the film described in mode 1 to mode 4. (Ts x 3) + TWn- It must be set to a time of ₁ or more, and even if there is no extra length at the end of the film as in mode 1, there was an irrational point that the drive continued for the maximum time. However, this embodiment has an advantage that this can be surely prevented.

 Next, the manual rewinding operation will be described.

As shown in FIG. 4, the third sheet winding is finished in T ₄ through T ₅ (similar to T ₄ through T ₅ of the operation Fig. 2), a camera at Thereafter time T ₉ ' When the operator causes the manual rewind input circuit 22 to generate a manual input pulse (k), this manual input pulse (k) is input to the toggle input terminal T via the OR gate 13 and the output of T-FF14 is inverted. OR gate 17b, motor ON-OFF circuit
At the same time when the motor ON-OFF signal (b) is set to H level via 18, the period timer 7 and the division timer 11 are started. The forward / reverse signal (Q) inverted to the H level switches the motor drive signal (j) to the extreme positive in the reverse rotation direction, reversely rotates (rewinds) the motor 20, and causes the third rotation at the time points T ₉ ′ to T ₁₀ ′.
Execute the rewinding of the first sheet. And this T ₉ ′ ~ T ₁₀ ′ is
Except for the judgment pulse (h) and the number of films, T ₉ ~ in Fig. 3
Similar to T ₁₀ . Therefore, in the following, the second sheet, the first sheet,
Winding up with the 0th sheet, that is, T ₁₀ to T when corresponding to FIG.
Proceed from ₁₁ to T _{12 to} T ₁₃ and complete the manual rewind operation at T ₁₄ .

 Next, the operation of the application example shown in FIG. 7 will be described.

If it is in the winding operation mode now, the forward / reverse signal (Q)
Is at the L level, the buffer gates 38 to 41 are in the operating state, and the output ends of the buffer gates 34 to 37 are in the high impedance state. Therefore, the output ends of the buffer gates 38 to 41 are respectively in the drive circuits 33a to 33d. It is connected to the input end. When winding operation is started, counting an output pulse at the timing of each of the edge counter 3 t ₁ ~t ₄ (TP
1) to (TP4) are output, so these are sequentially displayed dots
29 to 32 are driven via drive circuits 33a to 33d. Therefore, since the display moves from left to right in the figure, the feeding state of the film can be confirmed in real time. Further, during the rewinding operation, the forward / reverse signal (Q) becomes the H level similarly to the above, the buffer gates 34 to 37 are in the operating state, and the display dots 32 to 29 are sequentially driven to move from right to left in the figure. The display moves, and you can check the feeding status of the film in the rewinding direction in real time.

As described above, according to the present embodiment, the reference data (l) for detecting (determining) the end portion (end of film winding) and the draw-out portion (end of film rewind) of the film.
As the content of the previous feeding time TWn- ₁ is monitored every time one screen is fed, the feeding time is not affected by the change of the feeding time due to the usage condition of the battery. There is an advantage that the above determination can be performed. Moreover, the feeding time for one screen is divided by four substantially equal edge pulses (d), and the time point when each shutter closing pulse (a) rises (for example,
T ₀ ) and the time when each edge pulse (d) rises
Since the division timer 11 is restarted for each of t ₁ , t ₂ , and t ₃ , there is an advantage that optimal control can be performed with respect to the unknown extra length of the film end portion. Therefore, a huge amount of basic data as in the past is not necessary, and the analysis work for them is also unnecessary. Also,
An excessive load is not applied to each member of the mechanical portion such as the film or gear at the end of the film. Also, no mechanical member is required to detect the film end.
Therefore, the battery is small and can be simply configured, and optimal control is possible, so that energy saving of the battery can be achieved.

Further, the display dots 29 to 32 can be driven by the count output pulses (TP1) to (TP4), and in this case, the feeding state of the film can be confirmed in real time.

The present invention is not limited to the above-mentioned embodiment,
Various modifications can be made without departing from the spirit of the invention.

For example, the wind pulse (c) is 2 per screen.
The number is not limited to one and may be increased or decreased. In many cases, more optimal control of end detection becomes possible.

The configuration shown in FIG. 1 may be realized by software using a microcomputer. In this case, the size can be further reduced and the configuration can be simplified.

Further, the frame counter 24 may be configured not only to use the count 1 output (g) but also to refer to the count value. In this case, for example, even if the dummy sprocket 1a fails during the rewinding operation, the frame counter
It becomes possible to rewind while referring to 24.

Further, the content TWn- ₁ of the reference data (l) may not be used as it is, but may be processed and used as TWn- ₁ × 2 or TWn- ₁ × 1/2. In this case, it is possible to set the time suitable for the performance (configuration) of the mechanism section or the like regarding the film feeding of the camera.

Further, the dummy sprocket 1a is used to generate the wind pulse (c) by the wind pulse generating circuit 1.
Not limited to the example of turning on and off the mechanical switch by the rotation of, for example, a wind pulse in response to passage of the perforation by arranging a light projecting element and a light receiving element in the planned traveling area of the perforation part of the film in the camera. It may be configured to generate (c).

(E) Effects As is apparent from the above description in detail, according to the present invention, the feeding time for the previous film of one screen is determined by the pulse generating means, the edge detecting means, the edge counting means, and the shutter operation end. The feeding time for one screen obtained by the detection means and the first timing means and held as the second timing data in the timing data holding means and clocked during the current film winding operation When the third time measurement data exceeds the second time measurement data, which is the reference time, by a predetermined amount, the film winding is completed. Since it is configured to judge and rewind, it is not affected by battery exhaustion, environmental temperature, etc., and especially the load during film feeding is not affected by each perforation. Even if there is a sudden or accidental change during the passage of the film, the film feeding time on the film 1 screen is averaged, so the transition from the film winding operation to the rewinding operation is extremely accurate. It can be performed smoothly and smoothly.

Therefore, on the other hand, for example, the moving time for each perforation of the film is measured, and this moving time is set to 1
In comparison with the moving time (reference time) of the previous perforation, when the feeding time exceeds the reference time by a predetermined amount, it is judged that the film winding is completed and the film is rewound. For example, if there is an accidental or sudden change in the film feeding load in a very short time, the movement time of perforation at that time becomes short or long, and the reference time fluctuates extremely. ,
For example, if the reference time becomes short, it causes an inconvenience that the unexposed film is wasted due to a malfunction that makes a transition to the rewind operation when the rewind operation should not be performed. In that case, there arises a disadvantage that the motor is unnecessarily continued to be energized for a long time from the time when the rewinding is completed, but in the present invention, such a situation is not caused at all. When the rewind operation should be started, the hoist operation is stopped without delay, the rewind operation is immediately started, and when the rewind operation is not necessary, the rewind operation may be completely eliminated. Therefore, it is possible to eliminate the waste of the film in the unexposed portion due to careless rewinding of the film and to prevent the damage of the motor and the wasteful consumption of the battery as much as possible. It is possible to provide a feed state detecting device Lum.

Further, since there is no need for a mechanical member for detecting the end of film winding, it is possible to provide a film feeding state detecting device which can realize a reduction in size and weight.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a film feeding state detecting device according to the present invention, and FIGS. 2 to 6 are
1 is a timing chart showing operation waveforms of each part of FIG.
2 shows the winding operation, FIG. 3 shows the automatic rewinding operation, FIG. 4 shows the manual rewinding operation, FIG. 5 shows the operation of the edge counter, and FIG. 6 shows each of the division timers. FIG. 7 is a block diagram showing the configuration of an application example of the present invention, showing the operation of the mode. 1 ... Wind pulse generation circuit, 1a ... Dummy sprocket, 2 ... Edge detection circuit, 3 ... Edge counter, 4,16a, 16b, 26 ... AND gate, 5,15 ... Delay circuit, 6a, 6b , 13,17a, 17b ... OR gate, 7 ... cycle timer, 8 ... data latch, 9 ... data switching circuit, 10 ... initial data holding circuit, 11 ... division timer, 12 ... digital comparator, 14 …… T-type flip-flop (T-FF), 18 …… Motor ON-OFF circuit, 19 …… Motor drive circuit, 20 …… Motor, 21 …… Shutter close detection circuit, 22 …… Manual rewind input circuit , 23 …… Back cover closed detection circuit, 24 …… Frame counter, 25 …… Switching circuit, 27 to 32 …… Liquid crystal display part, 33a to 33d …… Drive circuit, 34 to 41 …… Buffer gate.

Claims (1)

(57) [Claims] 1. A film feeding state detecting device for detecting a change in feeding state of the film for each one screen when the film loaded in the camera is wound by a motor. A pulse generating means for generating a predetermined number of pulses as it is fed, and an edge each time a rising edge and / or a falling edge of each of the predetermined number of pulses is detected upon receiving the output of the pulse generating means. An edge detecting means for outputting a signal and an output of the edge detecting means for counting the number thereof and outputting a feeding end signal indicating the end of feeding for one screen at least at the time of counting the last edge signal. The edge counting means, the shutter operation end detecting means for detecting the end of the shutter exposure operation, and the output from the shutter operation end detecting means, Is turned on and the motor ON-OFF means for turning off the motor upon receiving the feeding end signal, and the feeding end signal and the shutter operation end detecting means for timing the time required for feeding the one screen When the output from the shutter operation end detection means is received, the initial state is reset and the time counting is started from this point, and the time counting operation is stopped at the time when the feeding end signal is received and the timing is sequentially measured. A first timing means for outputting data and the first timing means
The first timing data required for feeding one screen before the relevant screen which is already held at the time of receiving the output of the timing means and the feeding end signal and receiving the feeding end signal. Is updated to the time measurement data from the first time measurement means and is held as the second time measurement data, and the output of the edge detection means and the shutter operation end detection means is received, and the initial means at this point The second time measuring means for resetting the time measuring operation and starting the time measuring operation from this point of time, and outputting the time measuring data as the third time measuring data successively, sequentially compares the third time measuring data with the second time measuring data. Time data comparing means for outputting a judgment signal when the third time data exceeds the second time data by a predetermined amount or more, and a motor polarity switching means for receiving the judgment signal and switching the rotation direction of the motor. Feed state detecting apparatus of a film, characterized by being more configuration when.