JPS6057577B2 - Camera feeding control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera capable of shooting film in full size and half size, and more particularly to a camera feed control device that ensures accurate blank feed operation in this type of camera. .

In general, in a camera where film can be shot in full size and half size, the amount of film movement required to wind one frame of film differs between full size and half size.

Therefore, the number of perforation movements during one-frame winding is electrically counted, and when the counted number reaches a predetermined value, one-frame winding is completed, and the above-mentioned predetermined value is switched between full size and half size. It is conceivable to change the winding amount for one frame according to the full size and half size. However, in this case, a blank feed operation is performed prior to winding one frame of film, and the amount of blank feed changes in accordance with switching between full size and half size in the camera. For this reason, when switching to half size, the amount of jump feed was too small, and the exposed film that was initially pulled out of the cartridge was used for shooting, or when switching to full size. In some cases, there was a problem in which the amount of blank feed was too large, leading to extra blank feed and wasting the film. The present invention has been made in view of the above circumstances, and includes an automatic winding device for automatically winding the film in a camera that can switch between full-size and half-size film, and a film movement detection circuit that outputs a pulse signal; and a film movement detection circuit that counts the number of pulse signals output from the film movement detection circuit, and when the count number of the pulse signal reaches a predetermined value, the automatic winding device performs a winding operation. a switching circuit that changes the predetermined value in the counter circuit so that the film feed amount is appropriate for each film size in response to switching between full size and half size; A setting circuit is provided to set the predetermined value in the counter circuit to a constant value for blank feeding when the film is empty, regardless of switching between film size and half size. The purpose of this invention is to provide a feeding control device for celabra that enables feeding.

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

FIG. 1 is a perspective view showing an embodiment of a still camera to which a movement amount detecting device according to the present invention is applied, and shows a state in which a back cover and a pressure bonding plate of the camera are separated. In the figure, 1 is the camera body, and this part is made of electrically insulating material.
2 is the above-mentioned cover, 3 is the film opening window, the window surrounded by solid line 3a is the opening window 3A when the screen size of the film is full size, and the window surrounded by the dashed line 3b is the opening window when the film screen size is half size. Opening window 3B is shown.

Reference numeral 4 denotes a known outer rail for regulating the side edges of the film disposed on the camera body 1, and a pressure bonding plate, which will be described later, is pressed onto this rail.

5 is an inner rail arranged in the camera body 1 parallel to the outer rail, and 6 is a perforation arranged in a recess formed between the outer rail 4 and the inner rail 5. With the detection electrode,
One or more of them may be provided at intervals of an integral multiple of the perforation as shown in the first figure.

7 and 8 are provided so as to be slidable in the left-right direction to form a half-size opening window 3B when the screen size is switched to half-size. It is a thin plate, and this thin plate has an arm 7a as shown in FIGS. 6 and 7 for smooth sliding.
, 8a are provided.

9 is a back cover having a protrusion 9a.

Reference numeral 10 denotes a film guiding roller rotatably fixed to the camera body 1, and as will be described in detail later, this roller 10 also serves as a perforation detection electrode.

An electrode 11 is attached to the back cover 9 and is used when the film guide roller 10 is used as a detection electrode.

Note that when the detection electrode 6 is provided between the outer rail 4 and the inner rail 5, it is not necessary to provide it. 12 is the back cover 9
This is a switch that engages with the protrusion 9a and turns on and off in conjunction with the opening/closing operation of the back cover 9, the details of which will be described later.

13 is a screen size switching knob located on the outside of the camera; when set to index 14 marked F, it is set for full size; when set to index 15 marked H, it is set for half size. The film opening windows 3A and 3B are respectively switched.

16'' is a known storage section for a film cartridge.

34 is attached to the back cover 9 via a spring 35 having an insulating member.

Note that the spring 35 is shown schematically in the figure for ease of understanding. Figures 2 and 3 show the detection electrode 6 in Figure 1.
In this cross-sectional view showing the structure of a portion including , the same parts as in FIG. 1 are designated by the same reference numerals.

FIG. 2 shows a state in which the perforations of the film 17 face the detection electrode 6, and FIG. 3 shows a state between the perforations, that is, the film surface faces the detection electrode 6. In FIGS. 2 and 3, 17 represents a film, and 34a is the other electrode fixed to the pressure bonding plate 34, which together with 6 forms an electrode for detecting capacitance.
4 and 5 are cross-sectional views showing the structure of a part including the known film guide roller 10 in FIG. The structure is shown when the electrode 11 is provided.

FIG. 4 shows a state where the perforation hole 17a of the film 17 is located between the detection electrode 11 and the guide roller 10, and FIG. 5 shows a state where the film surface 17b existing between the perforation holes is located. . Reference numeral 18 is a member for making the detection electrode 11 face the roller 10 at a predetermined interval, and is made of an insulating material and is attached to the back cover 9.

10a is a lead wire connected to the roller 10, and 11a is a lead wire connected to the electrode 11.

Incidentally, as shown in FIGS. 4 and 5, the detection electrode 11 and the mounting member 18 are arranged at positions facing the perforation holes 17a provided on both sides of the film, and are arranged opposite the guide roller 10. It is set up. 6 and 7 are principal part plan views showing the screen size switching mechanism of the camera shown in FIG. 1. FIG. 6 shows the switching lever 13 set to the full size position, and FIG. A state in which the switching lever 13 is set to the half size position is shown.

In FIGS. 6 and 7, the same parts as in FIG. 1 are designated by the same reference numerals. In FIGS. 6 and 7, reference numeral 19 denotes a guide pin for sliding the screen size switching thin plates 7 and 8, which is fixed to the camera body. 20 and 2
1 is a pin for sliding the thin plate 8 in conjunction with the thin plate 7; the pin 20 is fixed on 7a, and the pin 21 is fixed on 8a.

Further, the two pins 20 and 21 are engaged with a lever 22 that rotates around a shaft 23 fixed to the camera body 1. 2
4 is a pin for switching the contact piece 27, and is fixed to the arm 8a of the thin plate 8.

Further, this pin 24 is covered with an insulating member 25.
26a and 26b are contacts forming a switch 26 that transmits a switching signal indicating that the screen size has been changed to the control circuit; when the screen size is full size, the switch is opened as shown in FIG. When the size is half size, it is configured to close.

12a and 12b are contact pieces that form the first illustrated switch 12, and the switch formed by these 12a and 12b is closed when the camera is in the shooting state in order to return the counter to zero, which will be described later, and is closed when the camera is in the shooting state. It is unlocked when you open 9.

Reference numeral 30 designates a contact piece switching pin fixed to the switch switching plate 120 and covered with an insulating member 31.

Reference numeral 32 denotes a guide pin for the switch changeover plate 120, which is fixed to the camera body.

Further, the spring 33 always urges the switching plate 120 downward. FIG. 8 is a circuit connection diagram showing one embodiment of the film drive motor control circuit of the first illustrated camera.

In the figure, 300 is a film movement abnormality detection circuit;
This is a circuit that generates a film movement abnormality signal when film perforation detection is not completed within a certain period of time during film movement.As will be explained later, when this abnormality signal is output, the rotation of the film drive motor will stop. It also generates a warning signal. The terminal a is an input terminal to which a signal generated from a signal source (not shown) is applied when the imprinting of photographic data onto the film is completed, and the terminal b is an input terminal to which a signal generated from a signal source (not shown) is applied. The input terminal, terminal C, connected to the output end of the monostable multivibrator 677a shown in FIG. 9A is connected to the output end of the 0R gate 638a shown in FIG. 9B, which will be described later, so as to receive a motor stop signal. Input terminal 321 is an input terminal connected to input terminal a via inverter 320 and input terminal b
The output terminal of this 0R gate 321 is connected to the monostable multivibrator 322.
The set input terminal S of the flip-flop circuit 324 via
connected to. On the other hand, this flip-flop circuit (hereinafter F
F) 324 reset input terminal R is 0R gate 3
23 and a monostable multivibrator (hereinafter referred to as monomulti) 319, it is connected to the input terminal C. or,
One output terminal Q of the FF 324 is connected to a relay 326 via an inverter 325, and the other output terminal n is connected to an output terminal f that outputs a winding completion signal. Reference numeral 327 denotes a contact piece of the relay 326. When the relay 326 is energized, the contact piece 327 is connected to the b side, and when the relay 326 is de-energized, it is connected to the a side so as to short-circuit the motor 328.

A circuit 300 surrounded by a dotted line is a circuit provided to detect whether film winding or rewinding has been performed normally, and its input terminal d is a perforation detection circuit shown in FIG. 9A, which will be described later. It is connected to a level comparator 606 which is the output terminal of the circuit 600. 302 is 0R gate 30
It has an input end connected to the input terminal d through 1, and has an output end connected to the base of the Npn transistor 303.

304 and 305 are resistors and capacitors forming a time-setting circuit, and one of the resistors 304 is connected to the collector of the Pnp transistor 690 in FIG. 9A (7) via a line E3.

306 and 307 are resistors forming a voltage dividing circuit, and the output terminal of this voltage dividing circuit is connected to the input terminal (-) of the comparator 308.

309 is an N-width gate having an input terminal connected to the output terminal of the comparator 308 and an input terminal connected to the output terminal Q of the FF 324, and its output terminal is connected to the set input terminal S of the FF 319.

The output terminal Q of FF3l9 is connected to one input terminal of the 0R gate 323, and is used to output a signal to a warning circuit (not shown) indicating that film winding or rewinding is not performed normally. is connected to output terminal e of. FIG. 9 is a circuit connection diagram showing an embodiment of the perforation counting circuit of the film movement amount detecting device applied to the first illustrated camera.

FIG. 9 consists of FIG. 9A and FIG. 9B as shown. In the figure, 600 in the block surrounded by dotted lines is a perforation detection circuit, 610 is a perforation counting circuit, 630 is a film blank feed control circuit, 640 is a film number setting circuit, 660 is a film counter circuit, and 67
0 is a circuit for closing the back cover, detecting the presence or absence of a film, and generating a film size and rewinding signal. The perforation detection circuit 600 includes the detection sections 6, 34a. ．． CL resonance circuits 602, 603, oscillator 601, high pass filter 6
04, a detector 605, and a level comparator 606. As described above, the perforation detection parts 6 and 34a are formed by the electrodes 6 and 34a facing each other across the perforation part of the film, and one pole 6 is connected to the CL via the lead wire 6a (see FIGS. 2 and 3). One end of the resonant circuit and the other pole 34a are grounded to the camera body 1 via a lead wire 34b. When the hole 17a of the perforation part comes between the electrodes 6 and 34a, the capacitance between the electrodes becomes small, and the film part 17b (FIGS. 4 and 5)
(see figure), the capacity increases. Although a plurality of electrodes 6 are shown in FIG. 1, in order to simplify the drawing, only one pair of electrodes is shown in FIG. 9A. The oscillator 601 is a parallel resonant circuit L. This is an oscillator that generates a signal with a frequency determined by C and the capacitance between the sensing electrodes 6 and 34a, and is constructed of a well-known Franklin circuit, for example.

That is, since the perforation section passes between the electrodes 6 and 34a, the output of the oscillator 601 becomes a frequency-modulated signal. A high-pass filter 604 is connected to the output end of the oscillator 601, and when the perforation hole 17a faces the electrodes 6, 34a, the oscillator 601
It allows only the oscillation frequency generated by the oscillation frequency to pass through, and its output signal has a waveform as shown in FIG. 10B. When this is rectified by a detector 605 connected to the output end of the high-pass filter 604, it becomes the waveform shown in FIG. , a rectangular wave pulse signal such as D in FIG. 10 is obtained. This perforation detection signal is Flg. 8 and the counting circuit 610. 611 of the perforation counting circuit 610 is a monomultiplier, and when the detection signal (FIG. 10D) is input, it generates a pulse at the rising edge (or falling edge) of the detection signal (FIG. 10D). 61
2,613 are NAND gates each having two input terminals, 6
14 is an up/down counter that generates an output when counting four perforations, and NAND gate 61
Up count input terminal U.2 connected to U.2. ．． It has a down count input D1, a carry output C, and a borrow output B connected to a NAND gate 613, and is formed by a 2-bit binary counter.

615 is a 1-bit up/down counter having the same configuration as 614, and generates an output when eight perforations are counted.

616 to 619 are NAND gates each having three input terminals, 616 and 619 are for half size, 617 and 61
8 is for full size.

620 is an AND gate for film winding, and 621 is an AND gate for film rewinding, each of which generates a pulse when the film is advanced by one frame.

In the film blank feed control circuit 630, 631,
632 is a NAND gate with 3 input terminals, 633 is 6
This is an up/down counter with the same configuration as No. 14, with the least significant digit (
below? 0 (referred to as B) and the most significant digit (referred to as MSB hereinafter) P. 634 has 3 input terminals connected to LSBlMB of 633 and 0R gate 636,
AND gate, 635 is an inverter connected to NAND gate 634, 635a is an inverter connected to borrow output terminal B of counter 633, 638 is an input terminal connected to NAND gate 634 and AND gate 620
638a is an 0R gate connected to the NOR gate 638 and the inverter 635a, the output of which is connected to the input terminal C of FIG.
connected to. In circuit 670, switch 12 illustrated in FIG. 1 is connected to resistor T7! LRl, a line E3, and a power supply E (not shown) via a transistor 690. Connected to O. 6
Reference numerals 73 and 674 each have a monomulti, and 673 is connected to the switch 12 via an inverter 671, and 674 is connected to the switch 12 via inverters 672 and 671.

Furthermore, the output end RT of this monomulti 674 is connected to the counter 6.
It is connected to the reset terminals of 14, 615, 633, 663, and 664. 675 is an inverter; 676 is an inverter connected to the base of the transistor 690 and a normally open switch SW4 for detecting the presence of the film; 677;
are an inverter 676, a switch SW5 linked to a shutter release switch (not shown), and a NAND gate 63.
4 is an AND gate having an output terminal connected to the inverter 671, and 678 is a NAN having an input terminal connected to the AND gate 677 and the switch SW5.
D gate 677a is connected to AN via 0R gate 678a.
A monomulti is connected to the D gate 677 and the inverter 680, and its output terminal is connected to the input terminal b in FIG.

SW7 is a switch for starting film rewinding, and is connected to the line E3 via a resistor. 681 is inverter 680
is an inverter connected to switch SW7 via N. AND gate 612, 616, 617,
631 and 0R gate 636.

Also, the output terminal of the inverter 680 is connected to the N, AND gate 61.
3,618,619,632. 26 is the 6th
Film size selection switch shown in Figure 7, 68
2 is an 0R gate, and 683 to 685 are inverters.

In the film number setting circuit 640, 641 is a film number setting changeover switch whose one end is grounded, and this switch 641 is connected to a film number counter 663, which will be described later.
First position a1 for setting 664 to zero When the film size is full size, the film number counter 663,
Second position b1 for setting 664 to 12 When the film size is full size, the film number counter 66
Third position C1 for setting 3,664 to 24 and fourth position d for setting film number counters 663, 664 to 36 when the film size is full size.
have. 642, 643, 644, and 645 are each an inverter connected to the line E3 via a resistor R4;
Reference numeral 646 is for applying a signal for setting the film number counter to 12 to a decoder to be described later when full size is set by knob 13 in FIG. 1 and position b is selected by switch 641. ,AND gate,6
47 is set to half size by knob 13,
When position b is selected by switch 641, full size is set by knob 13 of AND gate 648 for applying a signal for setting the film number counter to 24 to a decoder, which will be described later. Further, when position c is selected by the switch 641, an AND gate 649 is used to apply a signal to the decoder to set the film number counter to 24. /VsJ for applying a signal to the decoder to set the film number counter to 48 when position c is selected by 641.
D gate 650 is an AND gate for applying a signal to the decoder to set the film number counter to 36 when full size is set by knob 13 and position d is selected by switch 641. , 651 is an AND gate 652 for applying a signal to the decoder to set the film number counter to 72 when half size is set by the knob 13 and position d is selected by the switch 641. is inverter 642
and an input terminal connected to the inverter 681
XCLUSIVEOR gate, 653 is an inverter connected to 652, and 654 to 658 are 0R gates forming a decoder.

In the film number counting circuit 660, 661,662
is a NAND gate, 663 is a W-adic reversible counter, and the down count input terminal DlLSBO. sMSBRl and bits P,Q
have. Also, this counter 663 is the 0R gate 6
data input 110R connected to gate 54; data input J connected to gate 655; data input K1 connected to AND gate 649; carry output C1 borrow output B; are doing. 664 is a reversible counter having 3 bits and capable of being preset, and its configuration is substantially the same as that of counter 663.

665 is a known magnitude comparator for comparing the preset value of the counter 663 and the output signal;
65 is a known magnitude comparator for comparing the preset value of the counter 664 and the output signal, and when the preset value and the output signal match, its l output terminal 0 becomes a high level (hereinafter referred to as ゜゜1゛). .

Next, the operation of the camera according to the above configuration will be explained with reference to FIGS. 1 to 10. Half size is selected as the film size, and the film number counter is switched to convert to half size. 641, and the detection electrode 6 is further provided between the outer rail 4 and the inner rail 5 as shown in FIGS. 2 and 3.

First, a film cartridge (not shown) is loaded into the film storage section 16 of the camera, the film 17 is wound around a film take-up spool (not shown), and the back cover 9 is closed.

When the back cover 9 is closed, the pressure bonding plate 34 is pressed against the outer rail 4 by the spring 35, and a gap is formed between the pressure bonding plate 34 and the inner rail 5. Therefore, it becomes possible to wind up the film 17 through this created gap. Also, when the film is loaded, the switch SW shown in FIG. 9A is closed.
Since transistor 690 is turned on, voltage is supplied to line E3 and to each electrical circuit. Furthermore, the back cover 9
When the switch is closed, the switch changeover plate 120 slides upward by the protrusion 9a provided on the back cover 9, and the pin 30
presses contact piece 12b of switch 12, so switch 12 is closed. When the switch 12 is closed, the output voltage of the inverter 671 becomes "1", and the AND gate 67
One input terminal of 7 is low level (hereinafter referred to as ゜゜0゛)
to a high level. On the other hand, the inverter 671 is “0”.
By changing from ゛ to ゜1゛, the inverter 675
The output end of the output terminal becomes ゜゜01゛ only during the pulse width of the output pulse of the monomulti 673.

For this purpose, counters 663 and 664 receive film number information preset by switches 26 and 641 via data input terminals. As mentioned above, the switch 26,
641, half-size is selected as the film size, and the number of frames in half-size is 241.
Since FI is preset, 0R gate 655,
Only the output terminal of 657 is set to "゜1゛".Therefore, the film number counter 663 is preset to 4,
Further, the film number counter 664 is preset to 2. Then, when the shutter release button (not shown) is pressed and the switch SW5 is closed, the AN
D) f-. The third input terminal of the port 677 becomes "1".

At this time, by closing switch SW4, inverter 676
The output of the NAND gate is "1", and since the blank feed of the film has not yet been completed, the output of the NAND gate is "1", and furthermore, by closing the switch 12 linked to the back cover 9, The output is also 66r3.
Therefore, the switch SW is linked to the shutter release button.
5 is closed, the output power of AND gate 677 is
Then, the monomulti 677 is sent via the 0R gate 678a.
a is triggered. When the multivibrator 677a is triggered, a pulse generated therefrom is sent to the input terminal BLO in FIG. 8 as a film feed start signal.
FF3 via R gate 321 and monomulti 322
24, the output terminal of the inverter 325 becomes 0.
5, and the relay 326 is energized. Therefore, the contact piece 327 of the relay 326 is switched to the b side, the film drive motor 3-28 is driven, and winding of the film 17 is started by a known mechanism (not shown). Winding of the film is started, and the film 11 is placed on the winding spool (
(not shown), the capacitance between the sensing electrode 6 and the electrode 34a changes as it moves, so the output signal of the oscillator 601 changes as shown in A in FIG. Change.

That is, the output frequency of the oscillator 601 becomes higher when the perforation hole 17a is located between the sensing electrode 6 and the electrode 34a than when the film portion 17b is located. Of the output signal of the oscillator 601, only the high frequency generated by the perforation hole 17a passing between the sensing electrodes passes through the high-pass filter 604, so the output signal of the detector 605 is as shown in c in Fig. become. The signal that has passed through the detector 605 is shaped into a rectangular wave pulse by a level comparator 606, and then converted into a pulse with a narrower pulse width by a monomulti 611. At this time, the rewind switch SW is open, so the NAND
The operation of gate 613 is prohibited and N. Only AND gate 612 is in an operable state. Therefore, the pulses generated from the monomulti 611 pass through the NAND gate 612 with their levels inverted, and are counted by the counter 614. When the counter 614 counts four pulses due to the holes 17a of the four perforations passing between the electrodes 6 and 34a, the carry output terminal c changes from "°1" to "0°0".

In this case, since the empty feeding of the film 17 has not yet been completed, the output of the NAND gate 634 in FIG. 9B is .degree. 1. Therefore, the operation of the NAND gate 616 is prohibited. Therefore, even if a carry signal is generated from the carry output terminal c of the counter 614 when four perforations pass between the electrodes, this signal is sent to the NAND gate 616.
, and no change occurs in SNAND gates 617-619. Thereafter, the counters 614 and 615 continue to count the number of perforation holes 17a, but when the eighth perforation hole 17a passes between the electrodes, the second counter 615 generates a kill signal, and the NAND gate 617 One input end of “
Since it is inverted from 1゛ to "゜0゛", N.AND gate 6
17 becomes "1" only during the pulse width of the carry signal generated from the counter 615, and the AND gate 620
The output of is also 6"R5. Therefore, the N,/VsJD gate 631 becomes "0" only during the pulse width of the carry signal generated from the counter 615.NAND gate 631
When the output changes as described above, the counter 633 for counting the number of blank feed frames increases, and its LSB becomes ゜“1.
It becomes ゛. The film 17 is further sent to the take-up spool (not shown), and the hole 17 of the first perforation is
When a is located between the electrodes, the NAND gate 631 becomes 660 force during the pulse width generated from the carry output terminal c of the counter 615 in the same manner as described above, so that the content of the counter 633 further increases and its LSB becomes “゜0゛, M
SB becomes "1". In exactly the same manner as described above, the 24th perforation hole 17a is located between the electrodes.
That is, when three frames of film are taken up on the take-up spool in terms of full size, the contents of the counter 633 further increase to 3, and the contents of the counter 633 increase to 3.
The two input terminals of the NAND gate 634 connected to the 0R gate 636 are both "1".As mentioned above, the rewind switch SW is open, so the output of the 0R gate 636 is "1". ing. For this reason, at the same time that the film advances by three frames in terms of full size, the NAN
The output of the D gate 634 becomes "゜1゛ to ゜゜0゛."
When the output of the NAND gate 634 changes as described above, the NAND gate 631 is forcibly placed in an inoperable state, that is, in a state in which it latches the film empty feed completion state, and the 0R gate 682 is also set to the film size selection switch. It becomes possible to output a signal according to the state of 26. When the film 17 is fed as described above and the output of the NAND gate 634 becomes ゜゜0゛, the NOR gate 6
38 and 0R gate 638a are both 6°1°,
The monomulti 319 shown in FIG. 8 is triggered, and the FF3
24 is reset, the film drive motor 328 is stopped, and the idle feeding of the film 17 is automatically stopped.
Then, when the shutter release button is further pressed, photographing ends, as is well known. After shooting, shooting information,
For example, the shooting date is imprinted on the film 17 by a well-known method, and a signal indicating that the imprinting is completed is sent from an unillustrated signal source to the input terminal a1 inverter 32 in FIG.
1, and when the monomulti 322 is triggered, the FF 324 is reset by the output signal of the monomulti 322 in the same manner as described above, and the film drive motor 328 is also driven again. As a result, film 1
1 is wound onto a take-up spool (not shown) as described above, and a number of pulses corresponding to the perforation holes 17a are generated from the level comparator 606 of the perforation detection circuit 600. The pulse generated by this level comparator 606 is shaped into a narrow pulse by a monostable multivibrator 611, and then passed through a NAND gate 612.
is applied to the up input terminal U of the counter 614 via
The counter 614 counts in the same manner as described above. Then, the length of one half-size frame is wound up, resulting in 4
The holes 17a of the perforations are connected to the electrodes 6, 34a.
When the counter 614 counts the four pulses generated thereby, the counter 614 counts the four pulses generated thereby.
A carry signal is generated from the carry output terminal C of 14.
At this time, since the voltage is "1" depending on the state of the output switch 26 of the inverter 684, only the gate 616 among the 5N7Vs!D gates 616 to 619 is in an operable state. The carry signal generated from the counter 614 due to the perforation holes 17a generated between the electrodes is transmitted to the NAND gate 614.
16, AND gate 620, NOR gate 638, 0
Monomulti 319 is triggered via R gate 638a and input terminal C of FIG. The pulse generated by this trigger resets the FF 324 again through the 0R gate 323, so that the motor 328 is stopped as described above, and following that stop, the winding of the film is also stopped. That is, the film 17 is moved toward the take-up spool by one half-size frame by the rotation of the motor 328, and then stopped. Furthermore, since the film has been completely fed, the output voltage of the inverter 635 is "1", and the switch SW7 is opened, and the switch 26 is opened.
is closed and switch 641 is switched to position b, so AND gate 621 and EXCLUSIVE
．． The outputs of the OR gate 652 are both "゜r゛".

Therefore, when one half-size frame is wound as described above and the output of the AND gate 620 becomes ゜゜1゛ by the pulse width of the carry signal in response to the movement of the hole 17a of the fourth perforation, the NAND Conversely, the output of the gate 662 becomes 660N only during that time, and since an input terminal that changes from "05" to "1" is applied to the down-count input terminal of the counter 663, the content of the counter 663 decreases, and the content of the counter 663 decreases. becomes 3. In other words, as the film 17 is advanced by one frame by the motor 328 after shooting, the film number counter 663
, 664 is reduced from 24 to 23. As a result, the display on the display device (not shown) connected to the output ends 0-Q of the film counter also changes from 24 to 23, indicating to the photographer that the film has been advanced by one frame. When photographing is continued thereafter, the film 17 is automatically wound and the film is automatically displayed in the same manner as described above. And the number of remaining films is the predetermined number, ta! For example, when the film rewinding switch SW is closed after the number of sheets reaches zero, the output of the inverter 680 is reversed from "゜1" to "0", and at the same time the output of the inverter 681 is reversed from ゜゜1゛ to ゜゜. Inverted to 0''. For this reason, gates 612, 6
13,616 to 621, 631, 632, and 652 are respectively switched to rewind gates. Also, inverter 6
By inverting the output of 80 from ゜゜0゛ to ``゜1゛, the monomulti 677a is output through the 0R gate 678a.
is triggered, the pulse generated from this monomulti 6747a triggers the monomulti 322 in FIG. 8, sets the FF 324, and the motor 32
8 is driven, and rewinding of the film 17 is started.
Furthermore, when the rewinding switch SW is closed, the NAND
Inverter 680 and inverter 68 of gate 619
Since the two input terminals connected to the NAND gate 619 both become "゜1", the NAND gate 619 becomes operational, and the AND gate 621 connected to it also becomes operational.Then, the rotation of the motor 328 When the rewinding of the film 17 is started, the perforation detection circuit 600 responds to the rewinding speed with a number of pulses corresponding to the holes 17a of the perforation, in the same manner as when the film 17 is wound. The pulses are generated at a speed of
The content of 4 decreases each time the hole 17a of the perforation is located between the electrodes, and at the same time when the fourth hole 17a is located between the electrodes, the level increases from the borrow output end B.
Generates a borrow signal of ゜0゛. This borrow signal is passed through gates 619, 621 and 661 to counter 663.
Since the voltage is applied to the up count input terminal U of , the contents of the film number counters 663 and 664 change from zero to one.
As the film 17 is further rewound, the contents of the film number counters 663 and 664 increase for each of the four perforation holes, in other words, each time one half-size frame is rewound. Then, the contents of the film number counters 663 and 664 are changed to the switches 26 and 6.
41, the output terminal of the magnitude comparator 666 becomes 6°0°2.
Since the output terminal of the 0R gate 636 changes from ゜゜1゛ to ゜゜0゛, the output of the NAND gate 634 changes from ゜"0゛ to "1゛, and the NAND gate 63
2 latch is released. Similarly, the inverter 635
Since the output of gate 6 changes from ゜゜1゛ to “0゛”
The operations of 61 and 662 are prohibited. Therefore, three pulses corresponding to three frames with a full-size width of the blank feed that are subsequently rewound are counted by a counter 633 via gates 619, 621 and 632. When the pulse corresponding to the third frame is input, the counter 633 generates a borrow signal with a level of "0" from the borrow output terminal B, so that the inverter 635a10R gate 638a1 input terminal C (FIG. 8) ,0R gate 323
FF324 by the reset pulse applied via
is reset, the drive of motor 328 is stopped, and film rewinding is completed. The above explanation relates to the operation of the camera when winding or rewinding of the film 17 is performed normally, but if the winding or rewinding operation of the film stops for some reason, the following works like this.

That is, when winding or rewinding of the film is stopped for some reason or these operations are not completed within a predetermined time, the pulse train is not generated from the perforation detection circuit 600 of FIG. 9A, so that the pulse train of the transistor 303 of FIG. The on/off operation stops and continues to be turned off.

Then, when the charging voltage of the time setting capacitor 305 of the time setting circuit reaches a predetermined value or more, the output of the AND gate 309 becomes "
l'', FF3l9 is set, FF324 for motor control is reset, driving of motor 328 is stopped, and a warning signal is generated from output terminal e in Fig. 8, and the output terminal connected to output terminal e is The warning circuit shown in the figure issues a warning. As explained above, the present invention allows the film to be switched between full size and half size.
When blank-feeding, regardless of the film size, the system automatically feeds three full-size frames, that is, a sufficient amount of blank-feeding, so you can always obtain an appropriate photograph from the first frame, and The effects are extremely high.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a camera using a film movement amount detecting device according to the present invention, and FIGS.
4 and 5 are cross-sectional views showing the structure of the part including the film guide roller in the camera shown in FIG.
7 is a plan view of essential parts showing the film size switching mechanism of the camera shown in FIG. 1, FIG. 8 is a circuit connection diagram of the film drive motor control circuit of the camera shown in FIG. 1, and FIG. 9A and 9B are a circuit connection diagram of the perforation counting circuit in the camera film movement amount detecting device shown in FIG. Figure 10 is a waveform diagram of various signals in the perforation detection circuit of Figures 9A and 9B.41●●●●Outer leg, 5II◆●●◆Inner leg, 69
34a...Perforation detection electrode, 10.
... Film guide roller, 11 ... Perforation detection electrode, 12 ... Switch activated by opening and closing the back cover, 13, 14, 15 ...
Screen size switching knob and indicators.

Claims (1)

[Claims] 1 In cameras that can switch between full-size and half-size film, an automatic frame advance device automatically advances one frame of film, and a film that outputs a film movement signal every time a certain amount of film is advanced. a movement notification circuit; a counter circuit that counts the film movement signal and inputs a frame feed completion signal to the automatic frame feeder to stop the one frame feed operation when the count value reaches a predetermined count value; A switching circuit inputs a switching signal to the counter circuit in response to switching between full size and half size, and switches the predetermined count value so that the film feed amount is appropriate for the film size, and a jump feed of the automatic frame feeder. a fixed circuit that fixes the switching signal input to the counter circuit in a constant state during operation;
During the idle feeding operation of the automatic frame feeding device, the frame feeding completion signal outputted from the counter circuit is counted, and the automatic frame feeding device is activated by the frame feeding completion signal until the count value reaches a predetermined count value. A feed control device for a camera, characterized in that a prohibition circuit is provided to prohibit the film from stopping, so that a fixed amount of film is fed in the feed operation regardless of whether the film is switched between full size and half size. .