JPH0648496Y2 - Film drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a film driving device, and more particularly, to a film loaded in a camera driven by a motor built in the camera and transferred. The present invention also relates to a film driving device having a transport signal generating means for generating a transport signal composed of a pulse signal.

(B) Conventional Technology In recent years, automation of camera operations has progressed, and along with this, the component ratio of components is shifting from mechanical components to electrical / electronic components. Furthermore, it is also intended to improve the reliability of the product by actively reducing the mechanical parts accompanied by wear as much as possible. The automatic functions of the camera include, for example, automatic loading to automatically load a film, a function to detect whether or not the film is present in the aperture section, and a motor built into the camera each time the shooting is completed There is an automatic feeding function that includes an automatic winding function for automatically winding the film and an automatic rewinding function for automatically rewinding the film when the film reaches the end of the number of shootable images.

However, there is a case where the film needs to be rewound even though the number of shootable films is in the middle, for example, when a film of a different type is to be exchanged or development and printing are to be performed quickly. In order to deal with such a case, even a camera having the above-mentioned automatic feeding function is provided with a switch for manual rewinding generally called manual rewind (hereinafter abbreviated as “MR”). The film is rewound by pressing the MR switch.

By the way, according to the mode of the manual rewinding operation activated by the MR switch, the conventional type is roughly classified into the following three types.

(I) The motor is driven only while the MR switch is pressed regardless of the presence / absence of the film. (Ii) When the MR switch is pressed in the presence of the film, the rewinding operation starts from that point. Rewind all of the film that has been started and wound up, if there is no film, it does not accept the ON operation of the MR switch and does not perform any operation, (iii) If there is film, the same as above When the MR switch is pressed, the rewind operation is activated to rewind all the film wound up to that point, and if there is no film, a predetermined time (for example, 20
The one that keeps driving the motor for ~ 30 seconds). In particular, the configuration of the automatic feeding function in the case of the method (iii) will be schematically described. As described above, an operation switch operated from the outside or an internal mechanism for improving reliability and downsizing the camera body. The number of switches such as control switches attached to the section is reduced as much as possible, and therefore, as a sensor for detecting the presence or absence of the film, detecting the transfer of one screen at the time of winding, detecting the quality of auto loading, etc.
It consists of dummy sprockets that mesh with the perforations of the film. The presence / absence of a film can be detected by monitoring the output of a pulse generation circuit that generates a pulse when the dummy sprocket rotates. In other words, the film transfer time for each screen by a timer that restarts each time a pulse is input from the pulse generation circuit (approximately 0.5 seconds on average)
By checking, the film transfer state can be detected, and if the film transfer stop is detected during the automatic and manual rewinding operations, it can be judged that the film is absent, that is, the rewinding is completed. However, with such a configuration, even if the dummy sprocket is broken or the film is slack in the cartridge, it may be erroneously determined that the rewinding is completed. In order to eliminate such worst cases, the above-mentioned predetermined time, for example 20 to 30
The motor is driven for a second in the rewinding direction. Therefore, with the film absent
When the MR switch is pressed, it is judged that there is no film in about 0.5 seconds, and then the motor is driven for 20 to 30 seconds.

In the case of the above method (i), there is an inconvenience that the MR switch must be kept pressed until the rewinding of the film is completed, and in the case of the above method (ii), the film must be present. For example, the operator cannot check the MR switch and the manual rewind function, and in the manufacturing process, a film must be attached or a special jig must be used for each check. Without this, the check work becomes complicated and eventually the manufacturing cost rises. In the case of (iii) above, if the MR switch is pressed without a film, other operations (photometry, distance measurement, lens drive, etc.) cannot be executed for 20 to 30 seconds, and The operability is poor, and it takes too much time to check the MR switch and the manual rewind function in the manufacturing process, and other operations cannot be checked for the above 20 to 30 seconds. There was a problem that I had to spend a lot of time.

(C) Purpose The present invention has been made in view of the above circumstances, and its object is to simply wind all the films wound up to that point with a simple structure when the film is present. It is an object of the present invention to provide a film drive device capable of easily and efficiently checking the manual rewinding function even when the film is rewound or absent, and can immediately shift to another operation after completion of the check.

(D) Structure In order to achieve the above object, the present invention drives a film loaded in a camera by a motor built in the camera and generates a transfer signal composed of a pulse signal as the film is transferred. And a transfer stop detecting means for outputting a determination signal indicating stop of transfer of the film when a predetermined time has elapsed after receiving the transfer signal and stopping the generation of the transfer signal. A film presence / absence detection means for receiving the transfer signal and the determination signal to detect whether or not the film is present in the vicinity of the aperture portion, and an externally operable winding for inputting an instruction to drive the motor in the rewinding direction. O when the rewind switch receives the output of the rewind switch and turns the rewind switch into the ON state and the OFF state, respectively. The switch operation detecting means for outputting the N signal and the OFF signal, and the output of the OFF signal and the film presence / absence detecting means are received to prohibit the output of the OFF signal when the film is present in the vicinity of the aperture portion. OFF signal prohibiting means for passing the OFF signal when the film is not present and the motor is rotationally driven in the rewinding direction when the ON signal is received, and when the judgment signal is received when the film is present To stop the motor, while the above film is not present,
It is characterized in that it comprises a motor control means for stopping the motor at the time of receiving the output of the OFF signal from the OFF signal prohibiting means. Hereinafter, the structure of the present invention will be specifically described based on an embodiment.

FIG. 1 is a circuit block diagram showing the overall structure of a film driving device according to the present invention.

In FIG. 1, 1 is a wind pulse generating circuit, 1a is a dummy sprocket, 2 is an edge detecting circuit, 3 is an edge counter, and 1a and 1 to 3 constitute the transfer signal generating means. 4 is a positive logic 2-input AND gate, 5
Is a delay circuit of several 100ns, 6a and 6b are both positive logic 3
Input OR gate, 7 is a cycle timer, 8 is a data latch, 9 is a data switching circuit, 10 is an initial data holding circuit, 11
Is a split timer, 12 is a digital comparator, and the above 4
8 to 11 and 12 constitute transfer stop detecting means. 13 is a positive logic 3-input OR gate, 14 is a T-type flip-flop (hereinafter simply referred to as “T-FF”), and 15 is a number 10
Delay circuit of 0 ns, 16a and 16b are both AND gates of positive logic 2 inputs, 17a is an OR gate of positive logic 3 inputs, 17b is an OR gate of positive logic 2 inputs, 18 is a motor ON-OFF circuit, 19 is a motor drive In the circuit, the above 13 to 19 constitute the motor control means. 20 is a motor for feeding a film, 21 is a shutter close detection circuit, 22 is a manual rewind input circuit as a switch operation detection means, 22a is an MR switch as a rewind switch, 22b is a film as film presence / absence detection means The detection circuits, 22c and 22d, and 22f are all AND gates of positive logic two inputs, and especially the AND gate 22c constitutes an OFF signal prohibiting means. 22e is a switch memory, 22g is a positive logic 2-input OR gate, 23 is a back cover close detection circuit, 24 is a frame counter, 25 is a switching circuit, and 26 is a positive logic 2-input AN.
It is a D gate.

The dummy sprocket 1a in this embodiment has a cam integrally with it and rotates by meshing with the perforation of the film transferred (fed) by the motor 20. It is configured to generate two pulses during ON / OFF driving to feed one screen of film.
The output terminal of the wind pulse generation circuit 1 is connected to the input terminal of the edge detection circuit 2, and the edge detection circuit 2
Is connected to the input terminal of the edge counter 3 and the third input terminal of the OR gate 6b and the first input terminal of the OR gate 22g.
The input end and the set input terminal S of the film detection circuit 22b are connected respectively. Output terminal TP of edge counter 3
TP4 of 1 to TP4 is the pulse input terminal PI, AND of the switching circuit 25
The first input terminal of the gate 4, the stop input terminal ST of the cycle timer 7, the latch input terminal L of the data latch 8 and AND
It is connected to the second input end of the gate 16a. OR gate 6a
The output terminal of is connected to the reset / start input terminal R of the cycle timer 7, and the data output terminal of this cycle timer 7
DT is connected to the data input terminal DI of the data latch 8, the data output terminal DO of this data latch 8 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 a digital comparator. This digital comparator 1 is connected to 12 comparison input terminals CM1.
The second judgment output terminal CMP is connected to the first input terminal of the AND gate 22d, and is connected to the second input terminal of the OR gate 6b, the third input terminal of the OR gate 6a and the reset input terminal R of the film detection circuit 22b, respectively. It is connected. The output terminal of the AND gate 22d is connected to the first input terminal of the OR gate 13 and the second input terminal of the AND gate 16b, and the output terminal of the OR gate 13 is connected to the toggle input terminal T of the T-FF14. The non-inverting output terminal Q of the T-FF 14 is connected to the first input terminal of the AND gate 16b via the delay circuit 15, and the polarity input terminal PCH of the motor drive circuit 19 and the second input terminal of the AND gate 4 are connected. And the inverting output terminals of the switching circuit 25, and their inverting output terminals are connected to the first and second input terminals of the AND gates 16a, 22f and 26, respectively.

On the other hand, the MR switch 22a is connected to the input end of the manual rewind input circuit 22, and the output terminal N of the manual rewind input circuit 22 is the first input end of the AND gate 22f and the switch memory 22.
The set input terminal S of e and the first input terminal of the OR gate 17b are respectively connected, and the output terminal F of the manual rewind input circuit 22 is connected to the second input terminals of the AND gate 22c, OR gate 22c and OR gate 22g, respectively. AND gate 22c
Has a first input terminal connected to the inverting output terminal of the film detection circuit 22b, the same output terminal connected to the second input terminals of the OR gates 13 and 17a, and the switch memory 22eno inverting output connected to the second input of the AND gate 22d. OR gate connected to the end
The output terminals of 22g and the AND gate 22f are connected to the reset input terminal R of the switch memory 22e and the third input terminal of the OR gate 13, respectively. Also, shutter close detection circuit
The output end of 21 is connected to the second input end of the OR gate 17b, the output end of this 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,
Reset input terminal R and OR gate of the edge counter 3
It is connected to the second input terminal of 6a. 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 a reset input terminal R of a frame counter 24 that counts the number of filmed images. The pulse output terminals P1 and P2 of the switching circuit 25 are connected to the increment input terminal INC and the decrement input terminal DEC of the frame counter 24, respectively, and the count output terminal KP of the claim counter 24 is connected to the first input terminal of the AND gate 26, The output terminal of the AND gate 26 is connected to the switching input terminal XG of the data switching circuit 9. 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 connected to the first input terminal of the OR gate 6a via the delay circuit 5,
The output terminal of the OR gate 6b is connected to the reset / start input terminal R of the divided timer 11, and the data output terminal DT of this divided timer 11 is the comparison input terminal CM of the digital comparator 12.
Connected to 2. Further, the output terminals of the AND gates 16a and 16b are respectively connected to the first input terminal and the third input terminal of the OR gate 17a, and the output terminal of the OR gate 17a is 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, and the output end of the motor drive circuit 19 is connected to the motor 20. It is connected to the.

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 an off state of the motor ON-OFF circuit 18. Motor ON-OFF signal that becomes L level when one pulse is applied to the input terminal OFF and becomes H level when one pulse is applied to the input terminal ON,
(C) is a wind pulse output from the wind pulse generation circuit 1, and (d) is an edge as a transfer signal output from the edge detection circuit each time each rising edge and falling edge of the wind pulse (c) is detected. Pulse, (TP
1) is output when the first edge pulse (d) is input, and similarly (TP4) is output as the transfer signal when the fourth edge pulse (d) is input. Of the count output pulses, in particular (TP4) is the feeding end pulse, (e) is the time data of the periodic timer 7, (f) is the time data of the divided timer 11, and (g) is the count value of the frame counter 24 is 1. The count 1 output signal becomes H level only when the count value becomes L level at other count values, and (h) is the time measurement data (f) input to the comparison input terminal CM2 and the time measurement data (l) input to the comparison input terminal CM1. ), A determination pulse as a determination signal which becomes H level only at an instant, (i) and (i ') are OFF pulses applied to the third input terminal and the first input terminal of the OR gate 17a, respectively (j) Is the motor that drives the motor 20 Doshingo,
(K) and (k ') are a manual ON pulse and a manual OFF as ON signals and OFF signals output from the output terminals N and F respectively when the MR switch 22a is turned on and when it is turned off. It is a pulse. The MR switch 22a is configured to be in an ON state while being pressed and to be in an OFF state when released. However, even if it is pressed only very momentarily, it is configured so as not to be turned off unless the half cycle ts of the wind pulse (c) elapses after it is turned on.
(L) is the reference data output from the data output terminal OUT of the data switching circuit 9, and (m) is inverted to L level when the edge pulse (d) is applied to the set input terminal S of the film detection circuit 22b. Indicates the presence of a film, and when the judgment pulse (h) is applied to the reset input terminal R, it is inverted to H level to indicate the absence of a film, and (n) is a set input of the switch memory 22e. When the manual ON pulse (k) is input to the terminal S, it indicates that the MR switch 22a is in the ON state by reversing to the L level, and when the manual OFF pulse (k ') is input to the reset input terminal R Switch memory 22 indicating that the MR switch 22a is in the OFF state by reversing to H level with
The switch status signal output from the inverted output terminal of e,
(P) and (r) are AND gates 22d and 22c, respectively.
These are the reverse rotation signal and the reverse rotation OFF signal output from.
Both the film detection circuit 22b and the switch memory 22e are constructed so that the signal at the inverting output terminal thereof becomes H level in the initial state. DP4 is the feeding end pulse (TP4)
Is a delayed feed end pulse delayed by several hundred ns, (Q) is L
The level indicates the normal rotation of the motor (film winding), and H
Forward / reverse signal that indicates the reverse direction (same rewind) at the level, ()
Is an inverted normal / reverse signal obtained by inverting the normal / reverse signal (Q), and (DQ) is a delayed normal / reverse signal obtained by delaying the normal / reverse signal (Q) by several 100 ns.

When a pulse signal is applied to each reset / start input terminal R, the cycle timer 7 and the division timer 11 zero-clear the timekeeping data (e) and (f) at that time, and the timekeeping operation starts, The periodic timer 7 stops the timing operation at the time when the feeding end pulse (TP4) is applied to its stop input terminal ST and holds the timing data (e) at that time, and the division timer 11 applies it to its stop input terminal ST. When the motor ON-OFF signal (b) becomes H level, the timing operation is stopped at that point and the timing data (f) at that time
Is configured to hold.

When the feeding end pulse (TP4) is applied to the latch input terminal L, the data latch 8 receives the reference data (the contents are 1 The time TWn- ₁ ) is updated to the time measurement data (e) and latched as new reference data, and the latched data is always output from the data output terminal DO.

The data switching circuit 9 connects the data input terminal D2 to the data output terminal OU when the signal applied to the switching input terminal XG is at the H level.
The data input terminal D1 is connected to the data output terminal OUT when it is at the L level.
The initial data output from the initial data holding circuit 10 is set to 1 second, 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 to invert the output each time one pulse is input to the toggle input terminal T, the motor drive circuit 19 Motor ON-OFF applied to control input terminal CTL
When the signal (b) is at H level, the motor is turned on, when it is at L level, it is turned off. When the forward / reverse signal (Q) applied to the polarity input terminal PCH when the motor is turned on is L level, the motor is rotated normally ( The motor is controlled by winding it up and rotating it backward (rewinding) if it is at H level.

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.
The frame counter 24 is configured to connect PI to the pulse output terminal P2, and the frame counter 24 increments the count value by one each time one pulse is applied to the increment input terminal INC and outputs one pulse to the decrement input terminal DEC. Each time it is applied, the count value is decremented by one, and when the reset pulse is applied to the reset input terminal R, the count value is zero-cleared.

2 to 6 are timing charts showing operation waveforms of the respective parts in FIG. 1, FIG. 2 shows a winding operation, FIG. 3 shows an automatic rewinding operation, and FIG. The manual (manual) rewinding operation in the presence of the film is shown, FIG. 4 (b) shows the manual operation in the absence of the film, FIG. 5 shows the operation of the edge counter 3, and FIG. The operation of the timer 11 is shown.

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 shootable films used in this example is
36 sheets, so-called 36-sheet film. 2 to 6, T ₀ , T ₂ , T ₄ , and T ₆ are points at which the photographing operation (shutter operation) ends and the winding operation starts, respectively.
T ₁ , T ₃ , T ₅ , and T ₇ are the time when the winding operation ends, respectively, T _{0 to} T ₁ are the first winding operation, T _{2 to} T ₃ are the second winding operation, and T _{4 to} T ₅ indicates the third winding operation, and T _{6 to} T ₇ indicate the period of the last 35th winding operation. Therefore, the first time before time T ₀
The shooting operation of the first image is being performed, and T _{1 to} T ₂ are the second image,
T ₃ through T ₄ third sheet, the T ₇ through T ₈ bypassing an intermediate indicates a period of the last 36 th photographing operation. ts is a half cycle of the wind pulse (c), t ₁ , t ₂ , t ₃ and t ₄ are the rising edges of the first, second, third and fourth edge pulses (d), respectively.
TW indicates the feeding time for one screen (winding time in FIG. 2), and the subscript indicates the number of shots. Therefore, TW ₁ is the feeding time of the first sheet, and TWn is the feeding time of the nth sheet in the same manner. However, in this embodiment, n = 36
And n = 35 in the periods T _{6 to} T ₇ . T ₈ is the 36th
Time of starting the sheet winding operation, in FIG. 3, T ₉
Is the time to move from the winding operation to the rewinding operation, that is, the time to start rewinding the 36th sheet, T ₁₀ is the 35th sheet, T ₁₁ is the 34th sheet, T ₁₂ is the 1st sheet, and T ₁₃ is the 3rd sheet. The 0th sheet, that is, the time point when the rewinding portion (for the first frame set) when the film is first set is started to be rewound, and T ₁₄ is the time point when the rewinding is ended. td is a delay time of several 100 ns.

In FIG. 4 (a), T ₉ ′ indicates the start of the manual rewinding operation in the presence of the film, and T ₉ ′ to T ₁₀ ′ indicate the rewinding operation for one sheet (one screen). Figure 4 (b) T ₃₀ ~T ₃₁ in the inter-group MR switch 22a when a reference time TWn- ₁ than shorter film absent is pressed, T ₃₂ is long continues to if split timer 11 is actuated For example, when the judgment pulse (h) is output, T _{33 to} T ₃₅ and T _{36 to} T ₃₉ are longer than the reference time TWn- _{1 while the} MR switch 22a is pressed, T ₃₄ , T ₃₇ and T ₃₈ is the time when the judgment pulse (h) is output.

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 is turned on for a predetermined time to automatically wind the film to the first film, the so-called auto loading and first frame setting operations are executed. If this succeeds, the frame counter 24 is turned on. The count value is incremented by 1 and set to 1. At this time, the operator knows that the preparation for photographing is completed based on the display state of the display device. Then, when the release button is pressed, operations such as photometry, distance measurement, and focusing are automatically executed, and a series of shooting operations in which the shutter opening / closing operation is executed are completed. Then, at the time T ₀ when the shutter closing operation is completed, the shutter closing pulse (a) is output from the shutter closing detecting circuit 21 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, the motor ON-OFF signal (b) becomes H level, and the motor 20 starts rotating 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 the OR gates 6a, 6
The time counting operation of the cycle timer 7 and the division timer 11 is started via b. The film is fed by the rotational driving of the motor 20, and the dummy sprocket 1a is rotated accordingly, and the wind pulse (c) is generated. Edge detection circuit 2
Generates this wind pulse (c). The edge detection circuit 2 outputs an edge pulse (d) every half cycle ts of the wind pulse (c), that is, at times t ₁ , t ₂ · t ₃ · t ₄ . This edge pulse (d) is an OR gate
Since it is input to the reset / start input terminal R of the split timer 11 via 66, the clocked data (f) of the split timer 11 is the data measured so far at t ₁ , t ₂ , t ₃ , and t ₄ , respectively. Zero-clear and start timing 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 (d) is to output the count output pulse (TP2) at time t ₂ which is input, in the same manner a fourth edge pulse (d) feeding end pulse at time t ₄ when is inputted (TP4) Output. That is, it can be said that the edge counter 3 monitors the feeding of the film for one screen.

On the other hand, timekeeping data (f) reset every time ts
Is one of the comparison input terminals CM2 of the digital comparator 12.
Is input to the T-FF14, and the T-FF14 is now a forward / reverse signal (Q) in the initial state.
Is at the L level and the inverted forward / reverse signal (Q) is at the H level, the AND gates 26 and 16a are in the operating state, and the MAND gate 4 is in the inhibiting state. In addition, since the switch memory 22e is also in the initial state, the switch state signal (n) is at the H level.
The AND gate 22d is also in operation. Also, since the frame counter 24 has a count value of 1, the count 1 output signal (g) is at the H level. Therefore, in the data switching circuit 9, since the data input terminal D ₂ and the data output terminal OUT are connected, 1 second of the initial data which is the output of the initial data holding circuit 10 is used as the reference data (l) of the other side of the digital comparator 12. Input to the comparison input terminal CM1, T ₀
It has been compared sequentially during through T _4, since in a state in which normal film is fed a ts "1 second, 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 the pulse output terminal. Output from P1 and applied to the increment input terminal INC, the frame counter 24 increments the count value by 1
The count becomes 1 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 is output as the timing data (e) T _0.
The data feeding time TW ₁ of the first sheet measured during the period from to T ₁ is held in the data latch 8. Further, at the same time, the feeding end pulse (TP4) is turned off (i ') via the AND gate 16a.
Is input to the OFF input terminal OFF of the motor ON-OFF circuit 18 to set the motor ON-OFF signal to the L level and stop the motor 20. And the motor ON-OF which became this L level
The F-signal (b) causes the division timer 11 to stop the time counting operation. 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 sheet is executed, and at time T ₂ , a shutter closing pulse (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. However, what is different is the content of the reference data (l), and in the operation of the second and subsequent images, one screen TWn- is always displayed.
It is to use ₁ . Therefore, in the operation of the first sheet, there is no data of the previous feeding time TWn- _1. Therefore, the initial data TW = 1 second is used only for the first sheet.

The 35th film is rolled up at T _{6 to} T ₇ , that is, the last 36th film is fed, and the release button is pressed at the appropriate time from T _{7 to} T ₈ , the 36th filming operation is performed. Is executed and the shutter closing pulse (a) is output at T ₈ . However, in this example, it is assumed that the film has no extra length and that the film fixed to the film core is in a slightly tense state.

Turning to FIG. 3, the shutter close pulse (a) activates the periodic timer 7 and the division timer 11 at time T ₈ , and 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 described above, there is no extra length at the end of the film. The film does not move because it is not. Therefore, since the wind pulse (c) is not generated, T _{8 to} T ₉ as shown in FIG.
TWn> T without restarting the split timer 11 between
The determination pulse (h) is output from the digital comparator 12 until Wn- ₁ is reached, that is, at time T ₉ when TW ₃₆ > TW ₃₅ . This judgment pulse (h) passes through the AND gate 22d in the operating state and becomes a reverse signal (p) (the content is the same as the judgment pulse (h)}, and is input to the toggle input terminal T via the OR gate 13. OR the output of T-FF14
Periodic timer 7 and split timer 11 via gates 6a and 6b
Are input to the film detection circuit 22b to restart them and are further input to the film detection circuit 22b. The reverse signal (p) input to the second input terminal of the AND gate 16b is the delayed forward / reverse signal (D
Since Q) rises after a delay time td from time T ₉ , the OFF pulse (i) is not output and the motor 20 continues to rotate.

The data latch 8 is fed at T ₉ end pulse (TP
4) is not entered, so the previous TW _{35 is} used as timekeeping data.
Holding

The film detection circuit 22b, an edge pulse during the set input terminal S of t ₁ ~ time T ₇ immediately after the time T ₀ (d) is continuously input intermittently, during which the film or absence signal (m) is It becomes L level and is inverted to H level by the pulse (h) as described above at the time point T ₉ , that is, at the time points t _{1 to} T ₇ above.
While the AND gate 22c is open during this period, the MR switch 22a is not pressed, so that the operation described above is not affected at all.

Now, by inverting the output of T-FF14, the forward / reverse signal (Q) becomes H level and the inverted forward / reverse signal () becomes L level, and both states are held. As a result, time point
At T _{9, the} motor drive signal (j) falls in the reverse direction and AND
The gates 16a and 26 are disabled, the pulse output terminal P2 is enabled in the switching circuit 25, the AND gate 4 is enabled, and the AND gate 16b is enabled after the delay time td as described above. . The motor 20 starts reverse rotation (rewinding) from time T ₉ , the film starts to be fed in the reverse direction, and the dummy sprocket 1a also starts reverse rotation accordingly.
Move to the rewinding operation for the 36th sheet. This dummy sprocket
1a is the second wind pulse (c) at time T ₁₀ .
Since it was stopped at the position immediately after the fall of, if it starts rotating in the opposite direction, it will rise from time t ₁ immediately after time T ₉ . Therefore, the split timer 11 is restarted each time T ₉ , t _{1 to} t ₄ . At time t ₄ , the feeding end pulse (TP 4) is output at time T ₁₀ , the cycle timer 7 is stopped at this time, and the data latch 8 holds the 35th sheet at T _{6 to} T ₇ . The data of the feeding time TW ₃₅ required for winding the eye is updated to the data of the feeding time TW ₃₆ ′ required for rewinding at _{9 to} T _10, and the 36th sheet rewinding operation is completed. And the feeding end pulse (TP4) is AND
Gate 4, restarting the cycle timer 7 as delaying delivery end pulse (DP4) from the time T ₁₀ via the delay circuit 5 after td. This state is not shown in FIG. 3, but in FIG. 5, this state will be shown if T ₀ is replaced by T ₉ and T ₁ is replaced by T ₁₀ . That is, time point t ₄ = T
_The division timer 11 is restarted at ₁₀ and the period 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 ~
During T ₁₄ , the motor ON-OFF signal (b) holds the H level, so the divided timer 11 does not stop.

As described above, the time points T _{10 to} T ₁₁ are the rewinding operation of the 35th sheet, and the same applies to the 34th sheet, the 33rd sheet, ...
Rewind sequentially with the first sheet, and rewind the first sheet at T _{12 to} T ₁₃ . That is, the film shot up to this point is T ₁₃ ~ T
Reference numeral ₁₄ is the 0th sheet, that is, the rewinding operation of the drawing portion of the film wound on the spool (winding) side by the above-described first frame set. At T ₁₃ , the division timer 11 is restarted, and the period timer 7 is restarted with a delay of td from this, and the rewinding operation of the 0th sheet is started.
Then, at the time point t ₁ , the drawer portion has finished passing through the dummy sprocket 1a, and the dummy sprocket 1a stops. The division timer 11 restarted at this time t ₁ continues the time counting operation because the edge pulse (c) is not input thereafter, and the time counting data (f) output at this moment is T _{12 to} T
_When the reference data (l) as the feeding time TW ₁ ′ required for ₁₃ is exceeded, that is, when TW ₀ ′> TW ₁ ′, the judgment pulse (h) is output from the digital comparator 12 at time T ₁₄ . Is output. This judgment pulse (h) becomes a reverse signal (p) via the AND gate 22d and the OR gate 13 and T-FF14.
Is inverted and input to the AND gate 16b.
At time T ₁₄ , the forward / reverse signal (Q) falls, the inverted forward / reverse signal (Q) rises, and the delayed forward / reverse signal DQ falls with a delay of td.
Therefore, the OFF pulse (i) is input to the OFF input terminal OFF of the motor ON-OFF circuit 18 via the OR gate 17a at the time point T ₁₄ , and the motor drive credential (j) is turned to the OFF level.
To stop. This completes the automatic rewinding operation.

Now, in the above explanation, when the 35th sheet of T _{6 to} T ₇ is rolled up (that is, the 36th sheet is positioned on the aperture plane), there is no extra length at the end of the film, and the film is slightly tensioned. In addition, the length of the drawn-out portion of the film at T _{13 to} T ₁₄ is the length corresponding to the time point t ₁ , but, for example, T _{8 to} T ₉ will be described 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 follows. being classified. Mode 1 operates from the time when the classification timer 11 is activated by the shutter closing pulse (a) at time T ₈ until the content TWn of the time measurement data (f) becomes TWn> TWn− _1, and so on. Are activated by the first edge pulse (d), and modes 3 to 4 are activated by the second and third edge pulses (d), respectively. That is, the operation shown by T _{8 to} T ₉ in FIG. 3 corresponds to the mode 1 in FIG.
It can be seen that the operation of T _{13 to} T ₁₄ corresponds 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. ) Half cycle ts 4
It means having a margin of a little less than double. That is, mode 1
In the case of mode 4, there is no extra length at the end of the film, so if the previous feeding time TWn- ₁ is exceeded, there will be no irrationality even if the rewinding operation immediately starts. Since the extra length corresponding to the time tsX ₃ up to the time point t ₃ is at the end of the film, it is reasonable to start the rewinding operation from the time point t ₃ when the feeding time TWn- ₁ is exceeded. Target. Conventionally, the content TWn- ₁ of the reference data (l), which is the reference for determination, is fixed, so the mode 1
~ In order to absorb the variation in the extra length at the end of the film explained in Mode 4, you must set at least the maximum time shown in Mode 4 (tsX ₃ ) + TWn- ₁ or more. In the case of Mode 1 As described above, there is an irrational condition that the film is continuously driven for the maximum time even when there is no extra length at the end portion of the film, but this embodiment has an advantage that this can be surely prevented.

Next, the manual rewinding operation when the film exists will be described.

As shown in 4 (a), the third sheet winding is finished in T ₄ through T ₅ (this operation is similar to T ₄ through T ₅ of FIG. 2), whereafter the time T ₉ ' At this point, the camera operator presses the MR switch 22a to cause the manual rewind input circuit 22 to generate a manual ON pulse (k), and this manual ON pulse (k) has an inverted forward / reverse signal () at the H level. Since the AND gate 22f is opened, it is input to the toggle input terminal T via the OR gate 13 to invert the output of T-FF14, and the motor ON-OFF signal (b) is set to the H level via the OR gate 17b. At the same time, 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 reverse polarity, reverses (rewinds) the motor 20, and
Executing a back third sheet of winding in T ₉ '~T _10'. The T ₉ ′ to T ₁₀ ′ are the same as T _{9 to} T _{10 in} FIG. 3 except for the judgment pulse (h) and the number of films. Therefore, hereinafter, the second, first, and 0th sheets are wound up, that is, when corresponding to FIG. 3, the process proceeds from T _{10 to} T ₁₁ to T _{12 to} T ₁₃ .
The manual rewinding operation ends at T ₁₄ .

It should be noted that the film detection circuit 22b is connected to t ₁ next to the time T ₀ in FIG.
From T _{4 to} T ₅ and T ₉ ′ in FIG.
This state is maintained until T ₁₀ ′ has passed and immediately before T ₁₄ in FIG. 3, and the state is reset at T ₁₄ . That is, since the operation from FIG. 1 to FIG. 4 (a) is all performed when the film is present, the film presence / absence signal (m) is the instant immediately after T ₉ and t ₁ immediately after T _0.
Except earlier and T ₁₄ thereafter is held at L level. Further, since the switch memory 22e is also continuously reset by the edge pulse (d) via the OR gate 22g, the switch state signal (n) is set to H unless the MR switch 22a is pressed.
The level is maintained, and as shown in FIG. 4 (a), when it is pushed, that is, at T ₉ ′, it becomes L level, but at the next t _1, it immediately rises to H level. Therefore, during operation after T ₉ ′,
Pressing the MR switch 22a does not affect the operation. Moreover, MR operation by even when the switch 22a has been held down judgment pulse (h) at T ₁₄ is automatically stopped rewinding operation is completed. That is, the MR switch 22a
Irrespective of the period of pressing, and regardless of the number of times of pressing, in other words, the film is rewound to the end of the film by a one-touch pressing operation.

Next, the manual rewinding operation when no film is present (absent) will be described mainly with reference to FIG. 4 (b). In addition, as a condition before this operation is started, T-
The FF 14, the film detection circuit 22b, and the switch memory 22e are all in the initial state. Further, without the film, the dummy sprocket 1a cannot rotate, and therefore, the wind pulse (c), the edge pulse (d), the count pulse (TP1).
.. (TP4) and delayed feeding end pulse (DP4) are all kept at L level during this operation, so these signals are omitted in the drawing. Further, the shutter closing pulse (a) is also not directly related to this operation and therefore omitted.

When MR switch 22a is depressed at time T ₃₀ manual ON pulse (k) is output, the manual ON pulse (k)
Lowers the switch state signal (n) to disable the AND gate 22d, reverses the output of the T-FF 14 via the AND gate 22f and the OR gate 13, and reverses the polarity in the motor drive circuit 19 ( Switch to the (rewind) side. At the same time, at the same time, the motor ON-OFF signal (b) of the motor ON-OFF circuit 18 is started via the OR gate 17b to rotate the motor 20, and the cycle timer 7 and the division timer 11 are connected via the OR gates 6a and 6b. Reboot. Further, the inverted forward / reverse signal (Q) causes the AND gate 16b to be in a prohibited state via the delay circuit 15, and the inverted forward / reverse signal causes the AND gate 16a to operate. If at T ₃₁ before the time T ₃₂ to time the contents TWn- ₁ reference data (l) has passed and has an MR switch 22a to the OFF state (although TWn since the operation from the initial state is started in this example _-1 = 1 second), the manual OFF pulse (k ') passes through the AND gate 22c in the operating state at the time point T ₃₁ and becomes the reverse OFF signal (r), turning the motor ON.
-OFF circuit 18 is input to stop the motor and at the same time OR
Input to T-FF14 through gate 13 and forward / reverse signal (Q)
To the L level and return the motor polarity to the forward rotation side.
And terminates the operation of the T ₃₀ ~T _31. That is, the MR switch 22a
The motor is rotated to the rewinding side only while is pressed. The division timer 11 stops at the time T ₃₁ when the motor ON-OFF signal rises, and the cycle timer 7 continues to count time. In this example, the output of the initial data holding circuit 10 is the reference data (l ) Is input to the digital comparator 12, and the feeding end pulse (TP4) is not input to the data latch 8 even in the initial state,
The data latch 8 keeps the data TWn- ₁ and does not affect this operation.

Next, the operation when the MR switch 22a is pressed for a period longer than the reference time TWn- ₁ will be described. While generally the same as described above, thereafter the time T _31, the MR TWn = 1 second after the switch 22a is pressed elapses at time T _33, the determination pulse (h) is outputted from the digital comparator 12 However, they are different. AND gate 22d is reverse rotation signal because prohibition state (p) is not outputted, the determination pulse (h) restarts the periodic timer 7 and dividing the timer 11 at time T _34,
Film motor only resets the detection circuit 22b continues to rotate in the unwinding direction, the MR switch 22a at time T ₃₅ OF
When F is applied, the ON-OFF signal (b) falls, the motor 20 is stopped, and the motor polarity is reset to the forward rotation side. The switch memory 22e is reset through the OR gate 22g by Naturally manual OFF pulses of time T ₃₅ (k '). Although the film detection circuit 22b is reset at time T _34, no change in the output and the state up to the immediately preceding reset (initial) state, the film presence or absence signal (m) is continues to hold the H level. Therefore the manual
OFF pulse (k ') is only while passing through the AND gate 22c which is in operation to stop the motor 20 at time T _35, as described above, MR switch 22a of the T ₃₃ through T ₃₅ is pressed The motor 20 will be rotated to the rewinding side. T _{37 to} T ₃₉
Similarly, the number of times the judgment pulse (h) is output, that is, the time during which the MR switch 22a is pressed is increased. Therefore, in summary, regardless of whether it is shorter or longer than the reference time TWn- ₁ , The motor 20 rotates to the rewinding side only while the MR switch 22a is being pressed.

As described above, according to the present embodiment, as the content of the reference data (l) for detecting (determining) the trailing end portion and the drawn-out portion of the film, the feeding time TWn- ₁ immediately before is fed by one screen. Since it is monitored every time it is sent, there is an advantage that the above determination can be performed in an optimum state without being affected by the change in the feeding time due to the usage state of the battery or the like. Moreover, the feeding time for one screen is divided by four edge pulses (d) which are substantially equal to each other, and each shutter closing pulse (a) rises (for example, T ₀ ) and each edge pulse (d) rises. Since the division timer 11 is restarted at every rising time point t ₁ , t ₂ , t ₃ , there is an advantage that optimal control can be performed for 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. Further, at the time of film end, the members such as the film and the gear mechanism are not unnecessarily excessively loaded. Also, no mechanical member is required to detect the film end. Further, since the battery is small and can be simply configured and optimal control is possible, energy saving of the battery can be achieved.

In the manual rewinding operation, when film is present, MR
The film can be rewound to the end by one-touch operation of the switch 22a, and even when there is no film, the motor can be rotated to the rewind side only while the MR switch 22a is being pressed while taking advantage of the above advantages. There is an advantage that the operator or a worker in the manufacturing process can easily and efficiently perform the function check of the MR switch 22a and the operation check of the manual rewind function without various inconveniences as in the past.

Further, the transfer state of the film and the presence / absence of the film can be detected only by the dummy sprocket 1a as a mechanical component, and the size and reliability can be improved and the material cost can be reduced.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, the wind pulse (c) is not limited to one per one screen, and may be increased or decreased. If the number is increased, the end detection can be controlled with higher accuracy.

Further, the configuration shown in FIG. 1 may be realized by software. In this case, the structure is small and simple.

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

The MR switch 22a is not limited to the mechanical structure,
It may be an approach switch, an optical switch, or the like.

Further, the manual rewind input circuit 22 is not limited to outputting the manual ON pulse (k) and the manual OFF pulse (k '), but outputs a level signal that holds the H level while the MR switch 22a is pressed. It may be configured to.

Further, the switch included in the wind pulse generating circuit 1 for generating the wind pulse (c) may be a photocoupler for detecting passage of the perforation of the film without using the dummy sprocket 1a.

(E) Effect As described in detail above, according to the present invention, when a film is present, with a simple structure, one-touch operation automatically rewinds and stops all the film that has been wound up to that point. Since the operability is excellent, the motor continues to rotate in the rewinding direction only during the period when the rewinding switch is pressed to turn it on when the film is absent.
As in the conventional case, the inconvenience of not accepting the operation of the rewinding switch when the film is absent, or waiting for the predetermined time to elapse once the rewinding switch is once pressed is completely eliminated, and You can easily and efficiently check the operation of the manual rewind function,
Moreover, since the presence / absence of the film and the detection of the stop of the film transfer can be configured by a single transfer signal generating means, it is possible to provide a film drive device capable of reducing the cost of raw materials and the manufacturing process.

[Brief description of drawings]

FIG. 1 is a circuit 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 timing charts showing operation waveforms of respective parts in FIG. , FIG. 2 shows the winding operation, FIG. 3 shows the automatic rewinding operation, FIGS. 4 (a) and 4 (b) show the manual rewinding operation, and FIG. 4 (b) shows the absence of the film, FIG. 5 shows the operation of the edge counter, and FIG. 6 shows the operation of each mode of the division counter. 1 …… Wind pulse generation circuit, 1a …… Dummy sprocket, 2 …… Edge detection circuit, 3 …… Edge counter, 4,16a, 16b, 26,22c, 22d, 22f …… AND gate, 5,15 …… Delay circuit, 6a, 6b, 13,17a, 17b, 22g ... 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, 22a …… Manual rewind (MR) switch, 22b …… Film detection circuit, 22e …… Switch memory, 23 …… Back cover closed detection circuit, 24 …… Frame counter.

Claims (1)

[Scope of utility model registration request] 1. A film drive apparatus having a transfer signal generating means for generating a transfer signal composed of a pulse signal as a film loaded in the camera is driven by a motor built in the camera and the film is transferred. Receiving a transfer signal, a transfer stop detecting means for outputting a judgment signal indicating a stop of the transfer of the film when a predetermined time elapses after the generation of the transfer signal is stopped, and receiving the transfer signal and the judgment signal, The film presence / absence detecting means for detecting whether or not the film is present in the vicinity of the aperture portion, the externally operable rewinding switch for inputting an instruction to drive the motor in the rewinding direction, and the output of the rewinding switch. A switch operation that outputs an ON signal and an OFF signal when the rewind switch is turned ON and OFF, respectively. And the OFF signal and the output of the film presence / absence detecting means, the output inhibits the output of the OFF signal when the film is present in the vicinity of the aperture portion and the OFF signal when the film is not present. OFF signal prohibition means to pass,
When the ON signal is received, the motor is rotationally driven in the rewinding direction, when the film is present, the motor is stopped when the determination signal is received, while when the film is not present, the OFF is turned on. A film drive device comprising: a motor control means for stopping the motor at the time of receiving the output of the OFF signal from the signal prohibiting means.