JPH09105992A - Film feeding controller for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unnecessary load such as tensile force, etc., from being imposed and to surely detect the final end of film at the time of feeding the film after photographing for the final frame is finished by stopping film winding operation when a moving amount detected by a moving amount detection means attains the specified amount. SOLUTION: When two perforations of the film 11 are detected by perforation detecting switches 7s and 7f after starting the winding operation for the film 11, the film winding operation of the ordinary frame is stopped by a 1st film winding control means (control circuit 30). Meanwhile, when the moving amount detected by a spool rotation detection circuit attains the specified amount after starting the winding operation for the film 11, the film winding operation is stopped by a 2nd film winding control means (control circuit 30). Therefore, the final end of the film is detected without imposing the unnecessary load such as the tensile force, etc., on the film 11 even in the case of the final frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feed control device for a camera, and more particularly to a film feed control device for a camera which uses a film having two perforations per frame.

[0002]

2. Description of the Related Art In recent years, various proposals have been made for a roll-shaped film which is applied when taking a picture and the like, in which two perforations for feeding the film are provided per frame. Various proposals have been made for such a film feeding control device for a camera which applies a roll-shaped film having two perforations per frame.

For example, a film feeding control device for a camera disclosed in Japanese Patent Laid-Open No. 6-138526 discloses a roll-shaped film having two perforations per frame and one perforation only in the final frame. In the case where the second perforation cannot be detected within a fixed time after detecting the first perforation of the above two perforations, the film end control ( The film end) is determined and the film feeding stop control is performed.

Further, the present applicant has previously filed Japanese Patent Application No. 6-1756.
No. 04 proposes a camera in which the film position is judged by using the logical product of two perforation detection signals.

That is, the applicant of the present invention has the above-mentioned Japanese Patent Application No. 6-1756.
The camera previously proposed by No. 04 turns on (O when two perforations are sent to a predetermined position).
The film is fed for one frame by the switch in the N) state. With such a structure, the absolute position of the film can be detected despite the simple structure.Therefore, during film feeding, an abnormality such as a power failure due to the removal of the power battery, etc. Even if the error occurs, there is an advantage that it is easy to restore the normal sequence.

[0006]

However, according to the means disclosed in Japanese Patent Laid-Open No. 6-138526, when the power supply voltage, temperature fluctuation, etc. are taken into consideration,
There is a problem that it is extremely difficult to set the fixed time period set after the detection of the first perforation.

Further, if an abnormality such as a power-off state occurs during the film feeding, whether the perforation detected after the restoration is the first perforation or the second perforation. However, there is a problem that it is impossible to distinguish between.

On the other hand, according to the means proposed by the above-mentioned Japanese Patent Application No. 6-175604, in the film feeding of the final frame, since the perforation of the final frame is only one, the detection of one frame is not possible. It will not be possible. Therefore, since the film is wound up until it is pulled at the final end and the film end is determined, it is possible that the operator of the camera may feel anxiety or discomfort. At the same time, the film cartridge in which the roll-shaped film is wound and housed, the film feeding mechanism on the camera side, and the like are burdened, so that a certain level of strength is required.

By the way, in recent years, the roll-shaped film is entirely accommodated in the film cartridge up to the leading end thereof, and the spool shaft around which the film is wound is rotatably supported in the film cartridge. A proposal has been made for a film cartridge in which the leading end of the roll-shaped film is sent out of the cartridge by being rotated in the reverse direction.

In such a film cartridge, the roll-shaped film is always accommodated in the film cartridge, and is necessary, for example, at the time of taking a picture, developing the film, or obtaining a photographic print from the film. Depending on the situation, it is necessary to feed the roll-shaped film from the film cartridge.

Therefore, when such a film cartridge is applied to the camera proposed in Japanese Patent Application No. 6-175604, the roll-shaped film is fed from the film cartridge and the film is fed every time the film is fed. At the final end, a load such as a tensile force is applied by the film feeding motor or the like, which causes a problem.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a film feeding control device for a camera which uses a film having two perforations per frame, when the film is fed after the last frame is photographed. Against unnecessary load such as tensile force, and surely the final end of the film (Film end)
The present invention provides a film feed control device for a camera which is capable of detecting.

[0013]

A film feeding control device for a camera according to the present invention is a film feeding control device for a camera using a film having two perforations per frame, and is arranged at a predetermined position of a camera body. , Perforation detection means for detecting the presence or absence of the two perforations, pulse signal generation means for generating a pulse signal corresponding to the film movement amount in association with the film movement, and counting the pulse signals to determine the film movement amount. The moving amount detecting means for detecting and the first film winding control means for stopping the film winding operation when the two perforations are detected by the perforation detecting means after starting the film winding operation, and the film winding operation. After starting the operation,
A second film winding control means for stopping the film winding operation when the movement amount detected by the movement amount detecting means reaches a predetermined amount.

Further, the perforation detecting means is characterized in that it includes two series switches arranged according to a positional interval between the two perforations.

In a film feeding control device for a camera using a film having two perforations per frame, when the two perforations are detected, the film winding operation is stopped and the film winding control is performed. After the film winding operation is started, the film winding operation is stopped when the perforation cannot be detected after the film is moved by a predetermined amount or after a predetermined time elapses.

With this configuration, the normal 1
In the winding operation for the frame, the winding operation is stopped by the first film winding controller, and the winding operation is stopped by the second film winding controller at the end of the film.

Since it is composed of two series switches,
When both of them are turned on / off at the same time, the first film winding control means stops the film winding operation. Since it is a serial switch, the number of input signal terminals to the first film winding control means can be reduced.

When two perforations are detected, the film winding operation is controlled to stop, and the perforation cannot be detected after the film winding operation is started, the film is moved by a predetermined amount, or after a predetermined time elapses. In this case, the film winding operation is stopped.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a diagram simply showing an internal structure of a camera according to a first embodiment of the present invention, and is a rear view in a state where a back cover of the camera is removed. In addition, in FIG. 1, in order to avoid complication of the drawing, the components of the camera not related to the present invention are omitted (the same applies hereinafter).

As shown in FIG. 1, the camera of the first embodiment is provided with a photographing opening 6 for exposing a film at a substantially central portion of the camera body 1, and this photographing is performed. At both ends of the camera body 1 with the opening 6 for the film sandwiched therebetween, a cartridge chamber 2 for loading a film cartridge (not shown in FIG. 1, see FIG. 2) at one end thereof, and a cartridge chamber 2 fed from the inside of the film cartridge. There is provided a film winding chamber 4 in which a winding spool shaft 5 for winding the formed film is rotatably supported.

A fork member 3 is rotatably provided on the ceiling of the cartridge chamber 2 so as to project toward the inside thereof. The fork member 3 has the film cartridge inside the cartridge chamber 2. In the state in which the film is loaded into the film cartridge, the fork member 3 is rotatably supported in the film cartridge and engages with one end of the spool shaft around which the film is wound. It is connected to a film feeding drive motor (described later, not shown in FIG. 1) via a film feeding mechanism (not shown) provided therein. As a result, the rotational driving force of the film feeding drive motor is transmitted to the spool shaft in the film cartridge so that the film stored in the cartridge is fed out, wound up, and rewound. It has become.

Further, at a predetermined position of the camera body 1, for example, in the vicinity of the photographing opening 6, at a position facing two perforations provided on the film when the film is fed, Perforation detection switches 7s and 7f, which are perforation detection means for detecting the presence or absence of this perforation, are arranged.

FIG. 2 is an external view showing the outline of a roll-shaped film applied to the camera of the first embodiment of the present invention, and shows a state in which the film is pulled out from the film cartridge. In addition, in FIG.
The above roll-shaped film is exemplified as, for example, a 24 film film, that is, a film having a length of 24 frames, and the final frame is shown as No. 24 (# 24).

As described above, the film cartridge 1
A roll-shaped film 11 is wound and accommodated in 0, and the film cartridge 10 has the above-mentioned main body 1
It is loaded in the cartridge chamber 2 inside.

As shown in FIG. 2, the roll-shaped film 11 housed in the film cartridge 10 is
1 frame (# 1) and 2 frames (#
2) ...... 24 frames (# 24) are arranged in order, and 2 frames are provided at both upper ends of each frame.
Individual perforations Pnf and Pns are provided. Here, for example, P1f is provided on the upper left side and P1s is provided on the upper right side as perforations corresponding to the first frame (# 1). Similarly, the perforation corresponding to the 24th frame (# 24) is on the upper left side. And P24s on the upper right side.

Further, only one perforation P0s is bored at the position immediately before the first frame, for example, at a position corresponding to the perforation Pns of the 0th frame at the leading end of the film 11.

The film cartridge 10 having the above-described film 11 stored therein is loaded in the cartridge chamber 2 in the camera body 1 and disposed in the camera body 1. By driving the feeding drive motor and starting the operation of the film feeding mechanism, a film feeding (film feeding) operation is performed. At this time, the film 1
When the first frame 1 is set to the rear of the photographing opening 6, that is, to the exposure position, the perforation detection switches 7s, 7 arranged on the camera body 1 side are arranged.
It is sufficient to stop at positions where P0s and P1f can be detected by f. Similarly, at the stop positions of the second frame and thereafter, the perforations Pns and Pn + 1f are made to correspond to the perforation detection switches 7s and 7f, and the film feeding is stopped at a position where this can be detected. You can do this.

FIG. 3 is a transverse cross-sectional view of a main part showing an outline of the film feeding control device for the camera of the first embodiment, and is a cross-sectional view taken along the line AA shown in FIG. is there. 1 shows the state where the back cover of the camera is removed, but FIG. 3 shows that the back cover of the camera is in the closed state. As shown in FIG. 3, the film 11 sent from the film cartridge 10 loaded in the cartridge chamber 2 provided at one end of the camera body 1
Shows the state when the film is being fed to the film winding chamber 4 side provided at the other end of the camera body 1.

The film 11 is the body 1 of the camera.
And a pressure plate 13 provided on a plate spring 14 provided on the inner wall side of a back cover 12 provided on the back side of the camera so that the film is fed in a film feeding path. It has become.

The pressure plate 13 is formed of, for example, a plate-shaped member made of metal or the like, and is arranged to maintain the flatness of the film 11. That is, the pressure plate 13 is always biased toward the camera body 1 side in the optical axis direction of the photographing optical system (not shown) by the biasing force of the leaf spring 14,
The flatness of the film surface is maintained in the film feeding path.

On the other hand, the perforation detection switches 7s and 7f are formed of fixed electrodes 20 and 21, conductive coil springs 22 and 23, conduction pins 24 and 25, respectively, and a control circuit 30 that controls the entire camera.
And electrically connected in series.

The perforation detection switches 7s and 7f are connected to the conduction pin 24 when the frame surface of the perforation detection switches 7s and 7f is located behind the photographing opening 6, that is, at the exposure position during the feeding operation of the film 11. , 25 are perforations Pns and Pn of the film 11 at the same time.
It is arranged at a position where it penetrates f and comes into contact with the pressure plate 13. That is, the perforation detection switches 7s and 7f form two series switches arranged according to the positional intervals of the two perforations Pns and Pn + 1f on the film 11.

FIG. 4 is a schematic diagram showing an electric circuit of the perforation detection switch section in the film feeding control device for the camera of the first embodiment. As shown in FIG. 4, the perforation detection switch section is formed by the perforation detection switches 7s and 7f and the pull-down resistor 26. Further, as described above, the perforation detection switch 7 is used.
s and 7f are formed by two series switches arranged according to the positional intervals of the two perforations Pns and Pn + 1f on the film 11.

As a result, when the frame surface of the film 11 is fed to the rear (exposure position) of the photographing opening 6, the perforation detection switch 7s,
7f is electrically connected via the pressure plate 13 so that it is simultaneously turned on.
At this time, Vcc level (1) is applied to the control circuit 30.
The signal of is input.

On the other hand, when the frame surface of the film 11 is not at the exposure position, at least one of the perforation detection switches 7s and 7f is turned off (OF).
F) It is in a state. At this time, a GND level (0) signal is input to the control circuit 30 via the pull-down resistor 26.

Here, regarding the perforation detection switches 7s and 7f, as shown in FIG.
Although the mechanical switch is applied, the present invention is not limited to this, and the same applies when an electrical contactless switch such as a photo interrupter or a photo reflector is applied.

FIG. 5 is a block diagram showing an outline of an electric circuit of the camera of the first embodiment.

As shown in FIG. 5, the control circuit 30 for controlling the entire camera is turned on by the power supply 31 and the first stroke of the release button which is an operation member provided on the exterior of the camera. 1R switch (SW)
32, a 2R switch (SW) 33 that is turned on by the second stroke of the release button, a photometric circuit 34 that measures the brightness of the object in response to the 1RSW 32, and a response to the 1RSW 32. A distance measuring circuit 36 for measuring the distance to the subject, a shutter control circuit 35 for performing an exposure operation based on the information of the photometric circuit 34, and a photographing optical system (photographing lens) based on the information of the distance measuring circuit 36. A lens drive control circuit 37 for driving (not shown) a focusing position, a motor drive circuit 38 for driving a drive motor 39 for film feeding, and a switch for inputting the perforation detection switches 7s, 7f. The input circuit 40 and the fork member 3 or the film winding chamber 4 that engages with the spool shaft in the film cartridge.
The rotation of the take-up spool shaft 5 is detected, that is, the rotation of the take-up spool shaft 5 is detected by a signal (a pulse signal or the like; details will be described later) generated in conjunction with the film movement, and the film movement amount is detected. A spool rotation detection circuit 41 or the like, which is a movement amount detection means for detecting the, is electrically connected.

FIG. 6 is a diagram showing an outline of an electric circuit of the movement amount detecting means (spool rotation detecting circuit 41) in the film feeding control device of the camera of the first embodiment.

As shown in FIG. 6, the spool rotation detecting circuit 41, which is the moving amount detecting means, outputs a signal in response to the rotation of the spool shaft in the film cartridge, whereby the film is moved in association with the movement of the film. It is for detecting the quantity and is composed of a leaf switch 28, a pull-up resistor 27 and the like.

The leaf switch 28 is composed of an arm portion 28a and a fixed portion 28b, and in a normal state, the arm portion 28a and the fixed portion 28b are in a non-contact state, that is, OFF. It is in a state.

The leaf switch 28 is arranged in the vicinity of the fork member 3 in the camera body 1, and the fork member 3 has a cam structure in cross section. Therefore, as the fork member 3 rotates, the arm portion 28a of the leaf switch 28 is pressed and comes into contact with the fixed portion 28b, whereby the ON / OFF state is switched. It has become.

Here, when the leaf switch 28 is in the OFF state, the pull-up resistor 2
While the Vcc level (1) signal is input to the control circuit 30 via the switch 7, when the leaf switch 28 is in the ON state, the GND
A level (0) signal is input to the control circuit 30.

As shown in FIG. 6, in the first embodiment, one pulse of the GND level (0) signal is input to the control circuit 30 while the fork member 3 makes one rotation. As described above, the fork member 3 is
Since the pulse signal matches the predetermined rotation position of, the spool shaft in the film cartridge can be set to the predetermined position by using this, for example, after rewinding the film after the end of photography. It is possible to stop it.

As a result, in the film cartridge in which all of the roll-shaped film is stored up to the leading end thereof, the spool shaft in the cartridge is stopped at a predetermined position to display the usage state of the film in the cartridge. It may be used for other purposes such as.

The operation of the camera of the first embodiment having the above-described structure will be described below with reference to the flowchart of FIG. It should be noted that FIG. 7 shows the operations performed by the above-described camera from taking a picture for one frame (exposure operation) to film winding.

First, prior to taking a picture, the film cartridge 10 is loaded into the cartridge chamber 2 in the camera body 1 and the back lid of the camera is closed. Then, the main body 1
Alternatively, a signal indicating that the back cover of the camera is closed is transmitted to the control circuit 30 by a detection switch (not shown) provided on the back cover or the like. In response to this, the control circuit 30 controls the motor drive circuit 38 to drive the film feeding drive motor 39, and the fork member 3 is rotationally driven via the film feeding mechanism or the like. As a result, the initial feeding operation of the film 11 in the film cartridge 10 is performed, and the first frame is set behind the exposure opening 6 (exposure position).
The camera is ready for photography.

Here, when the first frame of the film 11 is set at a position (exposure position) behind the photographing opening 6, as described above, the main body 1 of the camera is used.
The perforation detection switches 7s and 7f disposed on the side detect the perforations P0s and P1f of the film 11, and the control circuit 30 controls so as to stop the film feeding at that position. Become.

Then, as shown in FIG. 7, step S1
(Here, S represents an operation step. The same applies to the following.), It is confirmed whether the release button is half pressed and the first stroke is in the ON state.
That is, the state of the 1RSW 32 is confirmed. In this case, when it is determined that the 1RSW 32 is in the ON state, the process proceeds to the next step S2, and when it is in the OFF state, the 1RSW 32 is turned on (O).
N) Wait until the state is reached.

In step S1 described above, the 1RS
When W32 is turned on and the process proceeds to step S2, in step S2, the control circuit 30 controls the distance measuring circuit 36 in response to the 1RSW 32 to measure the distance to the subject. Yes (distance measuring operation). At the same time, in the processing of the next step S3, the control circuit 30 responds to the 1RSW 32 by the photometric circuit 3 described above.
4 is controlled to measure the brightness of the subject (photometric operation). Then, the process proceeds to the next step S4.

In step S4, it is confirmed whether or not the release button is further pushed and the second stroke is in the ON state, that is, the state of the 2RSW 33. In this case, the above 2RSW
When it is determined that 33 is in the ON state,
In the next step S5, if it is in the off state, it waits until it is in the on state.

In step S4, the 2RS
When W33 is turned on (ON) and the process proceeds to step S5, in step S5, the control circuit 30 determines, based on the distance information by the distance measuring circuit 36 obtained in step S2, The lens drive control circuit 37 is controlled to drive the photographing optical system (AF lens) to the in-focus position. At the same time, in the processing of the next step S6, the control circuit 30 causes the control circuit 30 to perform the above-mentioned step S3.
Based on the brightness information obtained by the photometric circuit 34 obtained in step 1, the shutter control circuit 35 is controlled to drive the shutter or the like, whereby the exposure operation, that is, the photographing operation is performed.

In this way, the exposure operation for the first frame of the film 11 is performed. Then, in the processing after step S7, the film winding operation for one frame to the next frame of the film 11 is performed.

That is, in step S7, the control circuit 30 causes the pulse signal output in conjunction with the movement of the film 11, that is, the spool shaft in the film cartridge and the fork member 3 to be output. By rotating, a counter for counting (counting) the pulse signals output by the spool rotation detecting circuit 41 is cleared (initialized) in synchronization with this, and the process proceeds to the next step S8.

In step S8, the control circuit 30 is
Controls the motor drive circuit 38 to energize the drive motor 39 for film feeding, and drive the drive motor 39 in the film winding direction. As a result, the film feeding operation (film winding operation) is started, and the process proceeds to the next step S9.

In step S9, the control circuit 30 is
Confirms the state of the perforation detection switch 7. In this case, when the corresponding perforations (here, perforations P1s and P2f) are detected when the next frame (here, the second frame) of the film 11 is at the exposure position, the film 11 is moved to the next frame. It is determined that the film has been fed (wound up) by a predetermined amount up to the exposure position of the frame (the second frame in this case), and the process proceeds to step S13. In step S13, the first film winding control means is used. The control means 30 controls the motor drive circuit 38, whereby the drive motor 3 for film feeding is controlled.
9 is stopped. As a result, the normal winding operation for one frame ends, and the series of sequences ends (END).

On the other hand, when the perforation of the next frame is not detected in the above step S9, the process proceeds to the next step S10, and the control circuit 30 moves the film 11 in this step S10. The pulse signal output in conjunction with it, that is, the pulse signal output from the spool rotation detection circuit 41 is monitored. In this case, when the pulse signal is not detected, the process returns to step S9, while when the pulse signal is detected, the process proceeds to step S11, and in this step S11, the counter is incremented by one. , And proceeds to the process of step S12.

Then, in step S12, the counter value added in step S11 is compared with the predetermined value N, and the final frame is output by the signal indicating the film movement amount output from the spool rotation detecting circuit 41. It is determined whether the film has been fed after the shooting, that is, whether the film has ended. Here, the predetermined value N is set to be larger than the number of pulses output when one frame on the film 11 is fed. In this case, when the counter value is smaller than the predetermined value N (counter value <N), the film 11 is not fed for one frame, that is, the film 11 is not fed.
When it is determined that the predetermined amount of movement has not been performed and the process returns to the process of step S9 described above, while the counter value is equal to the predetermined value N or large (counter value ≧ N) In this state, although the film 11 is fed by one frame, that is, the film 11 is moved by a predetermined amount, the perforation of the next frame is not detected. The film is fed after the last frame of the film 11 is photographed, and it is determined that the film 11 is at the final end (film end) of the film 11, and the process proceeds to the next step S13, in which the second film winding control is performed. The control circuit 30, which is also a means, controls the motor drive circuit 38 to stop the film feeding drive motor 39, thereby performing a series of sequence operations. To end the scan (end).

8 and 9 are time charts showing the film feeding operation in the camera according to the first embodiment. FIG. 8 shows the film feeding operation in the normal frame. 9A and 9B respectively show the film feeding operation after the final frame photographing.

As shown in FIG. 8, when the film feeding operation in the normal frame is performed, as described above, the drive motor 39 for film feeding is first energized to move the film 11. Start.

Here, in the state immediately before the start of the movement of the film 11, the perforation detection switches 7s, 7
f, the perforation P of the film 11
Since ns and Pn + 1f are detected, the perforation detection switches 7s and 7f are detected.
Are on at the same time, and Vcc level (1)
Signal is being input to the control circuit 30. In this state, when the movement (feeding) of the film 11 is started, the perforations Pns and Pn + 1f of the film 11 deviate from the positions of the perforation detection switches 7s and 7f, which causes the Vcc described above.
The level (1) signal changes to level (0).

Further, the film 11 is continuously fed, and the perforation Pn + 1 of the next frame is set by the perforation detection switches 7s and 7f.
When s and Pn + 2f are detected, the signal changes to the level (1) again, and in synchronism with this, the control means 30 controls the motor drive circuit 38 to control the film feeding. The drive motor 39 will be stopped.

During this period, one pulse signal is output by the pulse signal linked to the moving amount of the film 11.

That is, as described above, a pulse signal for one pulse is output for one rotation of the spool shaft in the film cartridge or one rotation of the fork member 3. This corresponds to the output of a pulse signal 0 times or 1 time when the film 11 for one frame is fed.

Next, the case where the film feeding operation is performed after the end of the photographing operation of the final frame will be described. Note that, as described above with reference to FIG. 2, for the film 11, for example, a 24 shot film is applied, so the final frame is the 24th frame.

As shown in FIG. 9, as in the case of FIG. 8 described above, the signals from the perforation detection switches 7s and 7f are Vc when the film 11 is fed.
Although the level is changed from level (1) to level (0), the perforation of the next frame is not detected by the perforation detection switches 7s and 7f because the feeding operation is performed after the last frame is photographed. Therefore, before the signals from the perforation detection switches 7s and 7f change to level 1 again, the pulse signal interlocked with the movement amount of the film 11 outputs the second pulse, and at this time, the film 11 corresponds to one frame. The above feeding (movement of a predetermined amount or more) is performed. Therefore, the motor drive circuit 38 is controlled by the control means 30 (second film winding control means) in synchronism with the signal output of the second pulse, and the drive motor 39 for film feeding is controlled. It will be stopped.

As described above, according to the first embodiment, the two perforations Pns, Pn + of the film 11 are turned on by the perforation detection switches 7s and 7f after the start of the film winding operation.
When 1f is detected, the film winding operation of the normal frame is stopped by the first film winding control means (control circuit 30), while the movement amount detected by the spool rotation detection circuit 41 after the film 11 winding operation is started. When a predetermined amount is reached, the film winding operation is stopped by the second film winding control means (control circuit 30), so that even in the final frame,
The final end of the film (film end) can be reliably detected without applying an unnecessary load such as a tensile force to the film 11.

Further, the winding stop control of the film 11 is only performed by different control in the case of the normal frame and the case of the final frame, and since the constituent member is not added, the apparatus itself. Can contribute to downsizing.

FIG. 10 is a diagram simply showing the internal structure of the camera of the modified example of the first embodiment, and is a rear view of the camera with the back cover removed. The camera of this modification is different from the camera of the first embodiment only in the arrangement of the perforation detection switch. Therefore, the same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 10, the perforation detection switch 7f arranged near the photographing opening 6 is provided.
a and 7sa are arranged at both ends of the upper portion of the photographing opening 6 so as to face the perforations formed on the film when the film is fed.

In this case, for example, when the first frame of the film 11 is set behind the photographing opening 6, that is, at the exposure position, the perforations P1f, 7sa are respectively set by the perforation detection switches 7fa, 7sa. The film feeding is stopped at a position where P1s can be detected, and the same applies to the second and subsequent frames.

With this structure, the same effects as those of the above-described first embodiment can be obtained in this modification as well.

FIG. 11 is a block diagram showing the outline of the electric circuit of the camera of the second embodiment of the present invention. Note that this FIG. 11 is a diagram corresponding to the block configuration diagram of the electric circuit of FIG. 5 described in the above-described first embodiment, and has basically the same configuration. Therefore, only different components in the second embodiment will be described below.

That is, as shown in FIG. 11, in the second embodiment, instead of the spool rotation detecting circuit 41 which is the moving amount detecting means in the above-mentioned first embodiment, the film feeding is performed. A motor rotation detection circuit 42, which is a movement amount detecting means for detecting a film movement amount by detecting a rotation of the drive motor by generating a signal in response to the drive of the drive motor, is provided. Is different.

The motor rotation detection circuit 42 detects the feeding amount of the film 11 based on the rotation amount of the film feeding driving motor 39. For example, the film feeding driving motor 39 is detected. Rotation of the drive motor 39 is transmitted by transmitting the rotational force to a rotary plate having a plurality of slits through a gear train (not shown) and detecting the rotation of the rotary plate by a photo interrupter or the like. It is designed to detect quantity.

The operation of the second embodiment thus configured can be explained by the same sequence as that of FIG. 8 described in the first embodiment.

That is, in the second embodiment,
In step S9 in FIG. 8 described above, if the perforation of the next frame is not detected,
In the process of the next step S10, the control circuit 30
Monitors the pulse signal output in association with the movement of the film 11, that is, the pulse signal output from the motor rotation detection circuit 42. In this case, if the pulse signal is not detected, the above step S
On the other hand, if the pulse signal is detected while returning to step 9, the counter is incremented by 1 in step S11, and the process proceeds to step S12.

Then, in step S12, the counter value added in step S11 is compared with the predetermined value N, and the final frame is output by the signal indicating the film movement amount output from the motor rotation detection circuit 42. It is determined whether the film has been fed after the shooting, that is, whether the film has ended. Here, as the predetermined value N in the process of step S12, a number larger than the maximum number of motor pulses generated when the film 11 is fed by one frame is set.

As described above, according to the second embodiment, the same effect as that of the first embodiment can be obtained.

By the way, in recent years, a film has been proposed in which a magnetic recording layer or the like for magnetically recording photographing information, for example, is provided on the film surface of a roll film for photographing. However, various cameras using such a film have been proposed, which have a magnetic head or the like as a means for performing recording and reproduction on the magnetic recording layer of the film.

FIG. 12 is a block diagram showing the outline of the electric circuit of the camera of the third embodiment of the present invention. In the camera of the third embodiment, it is assumed that the film having the above-mentioned magnetic recording layer or the like is applied and the magnetic head or the like as the photographing information recording / reproducing means is provided, but other The configuration is basically the same as that of the above-described first embodiment. Therefore, the same components are denoted by the same reference numerals, detailed description thereof will be omitted, and only different members will be described below.

As shown in FIG. 12, the camera according to the third embodiment makes contact with the magnetic recording layer provided on the film surface so that the photographing information and the like can be obtained when the film is fed. A magnetic information recording / reproducing means including a magnetic head 43 for magnetically recording, a magnetic recording circuit 44 for driving the magnetic head 43, and the like, and a film feeding unit provided for determining a recording timing of photographing information. It is constituted by a film movement amount detection circuit 46 which is a movement amount detection means for detecting the speed (feed amount).

The film movement amount detection circuit 46 is formed by a rotary plate 45 having a plurality of slits, a photo interrupter, etc., and the rotary plate 45 is driven by a rubber or the like that is in contact with the film. It is connected to a roller or the like so that it rotates in conjunction with the movement of the film. Then, the amount of movement of the film is converted into the number of pulses by detecting the amount of rotation of the rotary plate 45 with a photo interrupter or the like. That is, a signal is generated according to the rotation of the driven roller connected to the rotary plate 45, and the signal is detected by a photo interrupter or the like.

The operation in the above-described third embodiment configured as described above can also be described by the same sequence as in FIG. 8 described in the above-mentioned first embodiment.

That is, in the third embodiment,
In step S9 in FIG. 8 described above, if the perforation of the next frame is not detected,
In the process of the next step S10, the control circuit 30
Monitors the pulse signal output in association with the movement of the film 11, that is, the pulse signal output from the film movement amount detection circuit 46. In this case, if the pulse signal is not detected, the above step S
On the other hand, if the pulse signal is detected while returning to step 9, the counter is incremented by 1 in step S11, and the process proceeds to step S12.

Then, in step S12, the counter value added in step S11 is compared with a predetermined value N, and the final value is determined by the signal indicating the film movement amount output from the film movement amount detection circuit 46. Whether it is film feeding after the frame shooting is finished,
In other words, it is determined whether or not it is the film end. Here, as the predetermined value N in the process of step S12, a number larger than the number of pulses generated when the film 11 is fed for one frame is set.

As described above, according to the third embodiment, even in a camera to which a film having a magnetic recording layer for recording photographing information on the film surface is applied,
The same effect as that of the above-described first embodiment can be obtained.

FIG. 13 is a block diagram showing the outline of the electric circuit of the camera of the fourth embodiment of the present invention. Also in the fourth embodiment, basically, the above-mentioned first embodiment is used.
Since it has the same configuration as that of the embodiment, the same reference numerals are given to the same constituent members, and the detailed description thereof will be omitted, and only different members will be described below.

As shown in FIG. 13, in the camera of the fourth embodiment, as a means for converting the film movement amount into a pulse signal, the spool shaft in the film cartridge rotates integrally with the spool shaft. Providing a rotating plate,
Bar code 4 can be used to display information about the film on this rotating plate.
An example is shown in which the data is recorded by 7 or the like. A bar code input circuit 48 including a photo interrupter and the like is arranged to read bar code information from the pattern signal of the bar code 47.

The operation in the above-described fourth embodiment configured as described above can also be explained by the same sequence as in FIG. 8 described in the above-mentioned first embodiment.

That is, in the fourth embodiment,
In step S9 in FIG. 8 described above, if the perforation of the next frame is not detected,
In the process of the next step S10, the control circuit 30
Performs monitoring by the bar code input circuit 48 of a pulse signal output in association with the movement of the film 11, that is, a signal generated according to the rotation of the bar code 47. In this case, if no signal is detected, the process returns to step S9, while if a signal is detected, the counter is incremented by 1 in step S11, and the process proceeds to step S12.

Then, in step S12, the counter value added in step S11 is compared with the predetermined value N, and the final frame is output by the signal indicating the film movement amount output from the bar code input circuit 48. It is determined whether the film has been fed after the shooting, that is, whether the film has ended. Here, as the predetermined value N in the processing of step S12, a number larger than the signal generated when the film 11 is fed for one frame is set.

As described above, according to the fourth embodiment, the same effect as that of the first embodiment can be obtained.

In the above-described first to fourth embodiments, when detecting the final end of the film, the moving amount of the film is detected, and when the predetermined amount of movement is detected, the film is fed. The drive motor is controlled so as to stop.

That is, as described with reference to the flowchart of FIG. 8, when the perforation cannot be detected in the process of step S9, it is determined that the film movement amount exceeds the predetermined amount in the process of step S12. Then, it is determined that the film is being fed in the final frame, and in the process of step S13, the drive motor for feeding the film is controlled to be stopped.

In this way, instead of detecting the amount of film movement, for example, when the time during which perforation cannot be detected after the film winding operation is started exceeds a predetermined time, the control for stopping the film feeding motor is performed. May be

Further, in the above-described first to fourth embodiments, the two switches (7s, 7f) for perforation detection are connected in series, but not limited to this, for example, in parallel connection. The same applies when the signals from the perforation detection switches are input to the control circuit 30.

In this case, when both signals of the above two perforation detection switches are input, the winding operation is stopped, while the signal from either one of the two perforation detection switches is input. If not, when the film movement amount reaches a predetermined amount, or when perforation cannot be detected after the film winding operation is started, it is determined that it is the final end of the film when a predetermined time has elapsed. The film winding operation may be controlled to stop.

Further, in the above-mentioned first to fourth embodiments, the number of perforations per frame is exemplified as two, but, for example,
When a film having two or more perforations per frame is applied, the number of the perforation detection switches can be appropriately arranged by arranging according to the number of perforations in each frame. is there.

[Supplementary Notes] (1) In feeding one frame, in a film feeding control device of a camera using a film having two perforations corresponding thereto, perforation for detecting the presence or absence of two perforations due to film movement. Detecting means, means for generating a pulse signal corresponding to the film movement amount in association with the film movement, and means for counting the pulses to detect the film movement amount,
First film winding means for starting film feeding and detecting perforation, and second film winding means for stopping film feeding when the number of pulse signals reaches a predetermined number. And a film feed control device for a camera.

(2) Perforation detecting means for detecting the presence / absence of two perforations due to film movement, means for generating a pulse signal corresponding to the amount of film movement in association with the movement of the film, and counting the pulses to determine the film. A means for detecting the movement amount, a first film winding means for stopping the film feeding when the film feeding is started and the perforation is detected, and the pulse signal number reaches a predetermined number, that is, the film is at a certain position. Second film winding means for stopping the film feeding when the fixed amount is fed, and the film feeding is performed by the first film winding means for a normal photographing frame,
A film feeding control device for a camera, wherein film feeding is performed by the second film winding means for the last frame.

(3) In a film feeding control device for a camera using a film having two perforations per frame, a perforation detecting means arranged at a predetermined position of the camera body for detecting the presence or absence of the two perforations. , Signal generation means for generating a signal corresponding to the film movement amount in association with the film movement, movement amount detection means for receiving the signal and detecting the film movement amount, and after starting the film winding operation,
When the two perforations are detected by the perforation detecting means, a first film winding control means for stopping the film winding operation, and the movement amount detected by the movement amount detecting means after starting the film winding operation. A film feed control device for a camera, which comprises a second film winding control means for stopping the film winding operation when a predetermined amount has been reached.

(4) The film feeding control device for a camera as set forth in appendix 3, wherein the perforation detecting means includes two series switches arranged in accordance with the positional intervals of the two perforations.

(5) The film feeding control device for a camera as set forth in appendix 4, wherein the series switch is a mechanical contact switch or an electrical contactless switch.

(6) The film feeding control device for a camera as set forth in appendix 3, wherein the movement amount detecting means outputs a signal in accordance with the rotation of the spool of the film cartridge.

(7) The film feeding control device for a camera as set forth in appendix 3, wherein the movement detecting means detects a signal generated in response to the driving of the film driving motor.

(8) The film feed of the camera according to appendix 3, wherein the movement amount detecting means has a driven roller for detecting the movement of the film, and detects a signal generated according to the rotation of the driven roller. Control device.

(9) The film feeding control device for a camera as set forth in appendix 3, wherein the movement amount detecting means detects a signal generated according to rotation of a bar code provided on the film cartridge.

(10) In a film feeding control device for a camera using a film having two perforations per frame, a perforation detecting means arranged at a predetermined position of the camera body for detecting the presence or absence of the two perforations. A signal generating means for generating a signal corresponding to the film movement amount in association with the film movement, a movement amount detecting means for receiving the signal and detecting the film movement amount, and the perforation after the film winding operation is started. When the two perforations are detected by the detection means, the first film winding control means for stopping the film winding operation, and the time counting operation is started after the film winding operation is started. Second film winding control that stops the winding operation And a film feeding control device for the camera.

[0110]

As described above, according to the present invention, in a film feeding control device for a camera which uses a film having two perforations per frame, the film feeding control device for the film at the time of feeding the film after the last frame is photographed. Thus, it is possible to provide a film feeding control device for a camera, which can prevent an unnecessary load such as a pulling force from being applied and can surely detect the film end end (film end).

[Brief description of the drawings]

FIG. 1 is a diagram simply showing an internal structure of a camera according to a first embodiment of the present invention, showing a rear view of the camera with a back cover removed.

FIG. 2 is an external view schematically showing a roll-shaped film applied to the camera shown in FIG.

FIG. 3 is a cross-sectional view of a main part showing an outline of a film feeding control device of the camera of FIG.

4 is a diagram showing an outline of an electric circuit of a perforation detection switch section in the film feeding control device of the camera of FIG.

5 is a block diagram showing an outline of an electric circuit of the camera shown in FIG.

6 is a diagram showing an outline of an electric circuit of a spool rotation detection circuit in the film feeding control device of the camera of FIG.

FIG. 7 is a flowchart showing an operation from photographing (exposure operation) to film winding in the camera of FIG.

8 is a time chart when the film feeding operation of the normal frame is performed in the camera of FIG.

9 is a time chart when the film feeding operation is performed after the final frame shooting in the camera of FIG.

FIG. 10 is a diagram simply showing the internal structure of the camera of the modified example of the first embodiment of the present invention, and is a rear view of the camera with the back cover removed.

FIG. 11 is a block configuration diagram showing an outline of an electric circuit of a camera of a second embodiment of the present invention.

FIG. 12 is a block configuration diagram showing an outline of an electric circuit of a camera of a third embodiment of the present invention.

FIG. 13 is a block configuration diagram showing an outline of an electric circuit of a camera according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Camera body 2 ... Cartridge chamber 3 ... Fork member 4 ... Film winding chamber 5 ... Winding spool shaft 6 ... Shooting opening 7f, 7s, 7fa, 7sa ... Perforation detection switch (perforation Detecting means) 10 ... Film cartridge 11 ... Film 13 ... Pressure plate 38 ... Motor drive circuit 39 ... Film feeding drive motor 30 ... Control circuit 41 ... Spool rotation detection circuit (movement amount detection circuit) 42 ...... Motor rotation detecting circuit (moving amount detecting circuit) 43 ...... Magnetic head (magnetic information recording / reproducing means) 44 ...... Magnetic recording circuit (magnetic information recording / reproducing means) 46 ...... Film moving amount detecting circuit (moving amount detecting circuit) ) 47 ... bar code 48 ... bar code input circuit (movement amount detection circuit) Pnf, Pns ... perforation

Claims (3)

[Claims] 1. A film feeding control device for a camera using a film having two perforations per frame, and a perforation detecting means which is arranged at a predetermined position of a camera body and detects the presence or absence of the two perforations. Pulse signal generating means for generating a pulse signal corresponding to the amount of film movement in conjunction with film movement, movement amount detecting means for counting the pulse signals to detect the amount of film movement, and after starting the film winding operation. First film winding control means for stopping the film winding operation when the two perforations are detected by the perforation detecting means, and the movement detected by the movement amount detecting means after starting the film winding operation. When the amount reaches the specified amount, film winding Camera film feeding control apparatus characterized by comprising a second film winding control means for stopping the raising operation, the. 2. The perforation detection means,
2. The film feeding control apparatus for a camera according to claim 1, further comprising two series switches arranged according to a positional interval between the two perforations. 3. A film feeding control device for a camera, which uses a film having two perforations per frame, when the two perforations are detected, the film winding control is stopped and the film winding operation is stopped. After starting the film winding operation, if the perforation cannot be detected after the film is moved by a predetermined amount or after a predetermined time elapses, the film winding operation of the camera is stopped. Transmission control device.