JPH0720559A - Film moving state detector - Google Patents

Abstract

PURPOSE:To provide a film moving state detector capable of using a low-speed operation microcomputer capable of being driven at a low voltage as a control system for feeding a film by detecting the moving state of an automatically fed film, without taking a counting action. CONSTITUTION:The film moving state detector is constituted to include an encoder 6 operated to make one rotation in accordance with the movement of one frame of the film and outputting plural pulse signals having different generation intervals, a timer means 13 comparing plural time signals considering the different generation intervals with them and a moving state signal means 14 generating a film moving state signal based on the result of the comparing action of the timer means 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when automatically winding a film, detects the moving state of the film in order to detect the end of winding one frame of the film or set the operation timing of the data imprinting device. The present invention relates to a film moving state detecting device which outputs an output signal indicating the moving state.

[0002]

2. Description of the Related Art Various automatic film winding devices for automatically winding a photographic film in response to the end of photographing have been put into practical use. For example, it is possible to detect the end time of winding one frame of film as described above. Various types of film moving state detecting devices that operate are also known.

For example, a film movement state detecting means using an encoder for generating a pulse signal in response to the movement of the film as a film movement signal is well known.

FIG. 4 is a schematic plan view showing a conventional example of this type of encoder. A rotating disk 3 having transparent portions 1 and non-transparent portions 2 alternately arranged at an equal pitch, and a photo interrupter 4 are shown. The rotating disk 3 is provided so as to rotate about the shaft 5 by the movement of a film (not shown). In addition, the rotation is, for example, one film
It is designed to rotate once while moving for one piece.

Therefore, a pulse signal is generated from the photo interrupter 4 at every constant rotation of the rotary disk 3, and by counting the pulse signal, for example, the operation timing of the data imprinting device or the end point of winding one frame of film. Can be detected.

However, it is well known that the above-mentioned encoder is greatly affected by the inertia of the film, that is, even if the film winding operation is stopped, the movement of the film does not stop immediately because of the inertia. It is known that the movement is stopped after a certain amount of overshooting, and if the overshooting amount is accumulated, there is a risk that a predetermined number of images cannot be captured.

On the other hand, as an arrangement for solving the above-mentioned inconvenience, an encoder having the arrangement shown in the schematic plan view of FIG. 5 is disclosed in Japanese Patent Laid-Open No. 63-147150. In FIG. 5, the same reference numerals as those in FIG. 4 denote the same functional elements.

In this encoder, a light transmitting portion 1 and a light non-transmitting portion 2 are provided in a band shape in a constant angle range A with respect to the entire circumference of a rotating disk 3 in a radial manner and at equal intervals.

When the number of the non-light-transmitting portions 2 is counted by a predetermined number, a stop signal for winding one frame of the film is output, and the operation timing signal of the data imprinting device is the constant angle range A. The output is made by counting the number of non-light-transmitting portions 2 in the narrower angle range B.

Therefore, since the moving state of the film can be detected from the midway of the film running to the end of the film running, the above-mentioned overshooting amount of the film is not accumulated, and the operation timing of the data imprinting device is prevented. Since the signal and the one-frame winding end signal are output by the counting operation of the pulse signals in the different angular ranges of the rotary disc 3, there is no need to add a photo interrupter, and the encoder can have a simple structure.

[0011]

As described above, the encoder disclosed in JP-A-63-147150 is
The end time of one frame winding is detected on the basis of the count of n pulse signals output from the midway of one frame of film to the end of running, and the above-mentioned overshooting amount of film is not accumulated. However, considering the case where the configuration using the encoder disclosed in the above publication is put to practical use, the pulse signal of the pulse signal for outputting the operation timing signal of the imprinting apparatus is considered. It is necessary to perform the counting operation processing and the counting operation processing for outputting the one-frame winding end signal almost at the same time.

On the other hand, in recent years, it is needless to say that a microcomputer is used for controlling various electric circuits in a camera, and of course, the above-mentioned processing system is no exception and the use of the microcomputer can be considered.

However, when the pulse signal counting operation processing for outputting different output signals as described above is attempted to be performed by the microcomputer at substantially the same time, a high speed operation is required, and therefore, the micro computer used in the processing system described above. The computer had to adopt a computer with a high calculation speed.

However, a microcomputer having a high calculation speed is high in cost and requires a relatively high driving voltage to drive it, which results in an increase in processing system cost and, for example, in miniaturization of a camera. If the power supply voltage cannot be increased because the power supply shape is also limited and the size is reduced, it is not possible to use the microcomputer with a high calculation speed, and it is not possible to adopt the encoder as described above. There was an inconvenience.

The present invention has been made in consideration of the above-mentioned inconveniences, and is a film moving device having a structure in which a control system of a camera can be driven at a low voltage and a relatively inexpensive microcomputer with a slow operation speed can be used. An object is to provide a state detection device.

[0016]

SUMMARY OF THE INVENTION A film moving state detecting apparatus according to the present invention responds to the movement of a film of one frame by making one rotation and generates a plurality of pulse signal groups having different generation intervals during the rotating operation. An encoder to output,
By outputting a plurality of predetermined time signals in consideration of the different generation intervals and resetting the outputs by the generation of each pulse signal of the pulse signal group, the plurality of predetermined times and the generation intervals of each pulse signal And a timer means for comparing, and operating by detecting a comparison result of the timer means,
And a moving state signal generating means for generating and outputting a plurality of moving state signals indicating the moving state of the film in response to the generation state of the pulse signal group.

[0017]

Since the film moving state detecting apparatus according to the present invention is constructed as described above, the above-mentioned generation intervals of the pulse signals having different generation intervals output from the encoder by the movement of one frame of the film are the timer means. The time point at which the generation interval changes is detected and the movement process of one frame of the film is detected without counting the pulse signal and divided into a plurality of regions. You can do it.

Therefore, it is possible to control the counting operation based on the detection result at the time when the generation interval changes, and as a result, the counting operations having different meanings for outputting a plurality of output signals are detected in the plurality of areas. Each of them can be individually performed, that is, the counting operations having different meanings can be separately performed without performing them at the same time, and the load on the microcomputer can be reduced.

Further, the operation of confirming the generation interval by the first pulse signal after detecting the change time point can be directly used as a start signal of a necessary process, for example, in the last area of the plurality of areas. The result obtained by detecting the time point at which the pulse signal is generated by the timer means can be directly used as the one-frame winding end signal. In such a case, even when the operation is controlled by the microcomputer, the one-frame winding end time Since the count operation for detecting is not required, the load on the microcomputer can be reduced, that is, even if the count operation is performed by the imprinting operation, the counting operation of the entire device is only the count operation for the imprinting operation. And as a result, a low-speed microcomputer that can be driven at a low voltage can be used.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the film moving state detecting device of the present invention will be described below.

FIG. 1 is a schematic plan view showing an embodiment of an encoder 6 used in a film moving state detecting device according to the present invention.

In FIG. 1, a slit disk 9 having a non-light-transmitting portion 7 and a light-transmitting portion 8 is connected to a film winding operation system (not shown), and is centered on a shaft 10 in the arrow X direction. Moreover, when the film is wound by one frame, it makes one revolution.

The non-light-transmitting portion 7 and the light-transmitting portion 8 are indicated by C in the figure.
In the region shown by (4), they are alternately formed at an equal pitch, and in the region shown by (D), they are formed at a pitch different from the pitch of the above-mentioned C region.

The photo interrupter 11 is combined with the non-light transmitting portion 7 and the light transmitting portion 8 and generates a pulse signal by detecting the non-light transmitting portion 7 and the like.

Therefore, in the C region, a pulse signal having a predetermined interval is generated from the photo interrupter 11 every time the slit disk 9 rotates by a constant amount, and the D signal is generated.
In the region, the pulse signal having the generation interval different from that of the C region is generated.

That is, the encoder shown in FIG.
One rotation is made in response to the movement of the film for one frame, and a plurality of pulse signal groups having different generation intervals are output during the rotation operation.

FIG. 2 is a schematic block diagram of a photographic camera including an embodiment of the film movement state detecting device according to the present invention. In the figure, the constituent elements having the same reference numerals as those in FIG. 1 indicate the same functional elements. .

The control circuit 12 includes a photo interrupter 11
Output a plurality of predetermined time signals in consideration of different generation intervals of the pulse signal group, and reset the output at the generation of each pulse signal of the pulse signal group to set the plurality of predetermined times and A timer means 13 for comparing the generation interval of each pulse signal, and a plurality of movement state signals indicating the movement state of the film in response to the generation state of the pulse signal group, which operates by detecting the comparison result of the timer means 13. Movement state signal generating means 1 for generating and outputting
4, and is formed by a microcomputer without detailed description.

More specifically, the movement state signal generating means 14 determines the comparison result of the timer means 13 based on the pulse signal having a short generation interval among the plurality of pulse signal groups output from the encoder 6 as described above. In response to the comparison result, the imprinting timing setting means 15 for forming and outputting a timing signal for data imprinting operation and the timer means 13 based on the pulse signal of the last group of the pulse signal group are compared. Works in response, one of the films
It comprises winding end detection means 16 which forms and outputs a frame winding end signal.

In other words, the control circuit 12 receives the pulse signal group output from the photo interrupter 11 to cause the timer means 13 and the like to operate as will be described later, and the motor for winding the film F. It controls the operations of the drive circuit 18 of 17 and the imprinting device 19. Although not described in detail, the control circuit 12 and the encoder 6 shown in FIG. 1 constitute a film moving state detecting device according to the present invention.

FIG. 3 is a flowchart showing the operation of the microcomputer forming each means of the control circuit 12 in the operation of the film moving state detecting apparatus according to the present invention.
Will be described with reference to.

Now, when photography is completed and one frame of film winding is instructed as shown in step 300 of FIG. 3, the flow chart advances to step 301, in which the motor is driven first and the film winding system is started. The operation is started.

When the operation of the film winding system is started, steps 302 and 303 are sequentially selected in the flowchart, the data imprinting operation counter is reset, the long time timer is set, and then the photo interrupter 1 is set.
In step 304, the output of 1 is determined, that is, whether or not a low-level (hereinafter, simply referred to as L) output signal is output. It is assumed that the photo interrupter 11 of this embodiment generates an L output signal when the non-translucent portion 7 is detected and supplies it to the control circuit 12.

Now, the slit disk 9 and the photo interrupter 11 of the encoder at the initial film winding position.
Assuming that the relationship between and is in the state as shown in FIG. 1, when the film starts moving in the direction of arrow X by turning on the motor in step 301, the photo interrupter 11 causes the first non-light-transmitting portion 7 to move. Until it is detected, a high level (hereinafter simply referred to as H) output signal is generated, so the flow chart advances to step 305,
It is determined whether or not the preset time set by the long-time timer has elapsed.

Therefore, if the time set by the long time timer is set to be sufficiently longer than the time required to detect the first non-light-transmitting portion 7 from the state shown in FIG. After returning to 304, the above operation is repeated until the first non-light-transmitting portion 7 is detected.

When the first non-light-transmitting portion 7 is detected by the photo interrupter 11, the flow chart is step 307.
Proceed to and the long timer will be reset. If the first non-light-transmitting portion 7 is not detected, the set time of the long time timer is exceeded, and in such a case, step 305 is selected in the flowchart, and the operation of the film rewinding operation system is activated. To be done. That is, the fact that the photo interrupter 11 cannot detect the non-light-transmitting portion 7 and cannot output L despite the motor being turned on means that the film is not moving. In this case, in such a case, the film is judged to be the final end, and the rewinding process is selected.

When the long time timer is reset in step 307, the process proceeds to step 308, and it is determined whether or not the photo interrupter 11 outputs H, that is, whether or not the first light transmitting portion 8 can be detected. Is determined. In other words, it is determined whether or not the film has moved normally and the first area of the non-light-transmitting portion 7 has passed the detection area of the photo interrupter 11, and if it has passed, step 309 is selected and the short-time timer is selected. Is set. Since H cannot be output while passing through the non-light-transmitting portion 7, step 310 is selected, and it is determined whether the time set by the long-time timer has elapsed, as in step 305. Therefore, even at this time, the presence or absence of the movement of the film is confirmed again, and if it has not moved, step 310 selects step 306, and the film rewinding operation system is activated.

When the short time timer is set in step 309, the process proceeds to step 311, and it is determined whether or not the photo interrupter 11 outputs L, that is, whether or not the next non-light-transmitting portion 7 can be detected. Is determined.
In other words, it is determined whether or not the film has moved further normally and the first region of the light-transmitting portion 8 has passed the detection region of the photo interrupter 11, and if it has passed, step 312 is selected and the imprinting operation is performed. It is determined whether or not the state of the use counter is valid. The imprinting operation counter is used to set the imprinting position of the imprinting data. For example, when an appropriate number of presets is counted, the determination result in step 312 is valid. Has been formed.

Further, the photo interrupter 11 has a light transmitting portion 8
Cannot output L while passing through the detection area, and therefore the flowchart selects step 314 to determine whether or not the time set by the short-time timer has elapsed. Returning to step 311 and returning to step 302 when the time has elapsed.

If the result of the determination in the previous step 312 is that it is valid, step 313 is selected and the light emitting operation for imprinting the designated data is activated.

If the result of the determination in step 312 above is that it is not valid and the operation in step 313 above has ended, the flow chart in step 31
In step 5, the copying operation counter is incremented, and then steps 316 and 317 are sequentially selected to reset the short-time timer and determine whether the photo interrupter 11 outputs L or not.

That is, as in the case of the step 311 described above, it is judged whether or not the film further moves normally and the area of the next light transmitting portion 8 has passed the detection area of the photo interrupter 11, and therefore, further. The next non-light-transmitting portion 7 is located in the detection area and the photo interrupter 1
When 1 outputs L, the flow chart is step 312.
Then, the operation as described above is repeated. As described above, L is not output while the translucent portion 8 is passing through the detection area. Therefore, in the flowchart, step 318 is selected to determine whether the time set by the short-time timer has elapsed. It is determined whether or not it has elapsed, the process returns to step 317, and if it has elapsed, step 319.
And the long timer will be set again.

Considering each step as described above, when the film is normally wound and moved, the non-light-transmitting portion 7 and the light-transmitting portion 8 are provided in the area C of the encoder 6. Are alternately located in the detection area of the photo interrupter 11, the flow chart once advances to step 318, and thereafter step 312 and step 31.
Since it is going to be between 8 and 8, the above step 31
The selection of 9 will be performed after the final non-light-transmitting portion 7 in the area C has passed through the detection area.

In other words, when the D area of the encoder 6 reaches the detection area of the photo interrupter 11, the step 319 is selected, and the selecting operation of the step 319 is performed by the setting time of the short time timer. It is obvious that the operation is performed by the operation of comparing with the generation interval of the pulse signal output from the photo interrupter 11, and the moving state from the area C to the area D of the film can be detected without performing the counting operation. It is nothing but being.

When the setting of the long timer in step 319 is completed, the flow chart advances to step 320, and it is judged whether or not the photo interrupter 11 outputs L, that is, the non-light transmitting portion provided in the D area. It is determined whether or not 7 has reached the detection area of the photo interrupter 11, and if not, step 321.
If so, step 322 will be selected.

Step 321 is the above-mentioned step 30.
Similar to steps 5 and 310, it is a step of determining whether or not a predetermined time set by the long time timer has elapsed,
When it is determined that the predetermined time has elapsed, it is determined that the film is not moved, and the rewinding is instructed. If it is determined that the predetermined time has not elapsed, the process returns to step 320.

When the film is wound normally and the non-light-transmitting part 7 in the D area reaches the detection area of the photo interrupter 11, the flowchart selects step 322, and the motor turned on in step 301 is selected. Will be braked. That is, when the non-translucent portion 7 in the area D reaches the detection area of the photo interrupter 11, the movement of the film wound up to that point is stopped.

It is obvious that the operation of selecting step 322 in step 320 described above is the operation of outputting the one-frame winding end signal, and the operation is such that the non-light-transmitting portion 7 in the D area is in the photo interrupter 11. It is also clear that this is done in response to the detection result of whether or not the detection area has been reached, that is, without performing the pulse signal counting operation.

The slit disk 9 having the non-translucent portion 7 and the like formed therein is exactly 1 when one film is wound up.
The film is rotated, and as a result, the formation position of the non-translucent part 7 in the D region is set in consideration of the amount of one frame of the film to be fed, so that the film can be accurately wound. It goes without saying that you can do it.

The operation and the like of one embodiment of the film moving state detecting device according to the present invention has been described above with reference to the flow chart shown in FIG.
Considering the output operation of the frame winding end signal, the output operation of the timing signal for the imprinting operation, which was performed in the counting operation of the pulse signal in the above-mentioned flowchart, is performed by the following operation, although not shown. It can be done without doing.

That is, the non-light-transmitting portions are formed in a number in consideration of the number of data to be imprinted, and in a position in consideration of the imprinting position of the above-mentioned data on the film. Is set a predetermined time signal considering the moving time required to move the detection area of the photo interrupter, and if the time signal and the moving time are compared at the time of film winding, each of the non-translucent This means that it is possible to independently detect the time when the parts reach the detection area.

On the other hand, it goes without saying that this detection time point responds to the moving state of the film, and therefore the timing signal for the imprinting operation can be output in the above detection operation. The output operation of the operation timing signal of the data imprinting device can be realized without performing the signal counting operation.

The pulse signal group output from the encoder shown in FIG. 1 is of two types, and the detected region is two. However, a non-light-transmitting portion and a light-transmitting portion having different pitches are further provided. It goes without saying that by forming a combination, it is possible to output two or more types of pulse signal groups. In such a case, by setting various time signals by the timer means and performing a comparison operation with the generation interval of each pulse signal group, a desired operation in which the pulse signal counting operation as described above is not performed, or each region In the above, it is possible to realize the counting operation of the pulse signals independently or having an appropriate relationship.

[0054]

The automatic film feeder according to the present invention is
As described above, the encoder including the slit disk that makes one rotation in response to the movement of one frame of the film outputs a plurality of pulse signal groups having different generation intervals, and
Since the generation interval itself is confirmed by the timer means to detect the time when the generation interval changes, the movement process of one frame of the film can be performed without counting the pulse signal. And it can be detected by dividing it into multiple areas.
When the movement process of the frame is detected by the microcomputer, the load can be reduced, and as a result, the microcomputer of low speed operation which can be driven at a low voltage can be used.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of an encoder adopted in a film moving state detecting device according to the present invention.

FIG. 2 is a schematic block diagram of a photographic camera including an embodiment of a film movement state detection device according to the present invention.

3 is an operation flowchart showing an operation example of a microcomputer forming the control circuit 12 in FIG.

FIG. 4 is a schematic plan view showing an example of a conventional encoder that generates a pulse signal in response to movement of a film.

FIG. 5 is a schematic plan view showing an encoder disclosed in JP-A-63-147150.

[Explanation of symbols]

 6 Encoder 7 Non-light-transmitting part 8 Light-transmitting part 9 Slit disk 10 Axis 11 Photointerrupter 12 Control circuit 13 Timer means 14 Moving state signal generating means 15 Imprinting timing setting means 16 Winding end detecting means 17 Motor 18 Driving circuit 19 Copying Device

Claims (4)

[Claims] 1. An encoder that makes one rotation in response to the movement of a film of one frame and outputs a plurality of pulse signal groups having different generation intervals during the rotating operation, and a plurality of encoders that consider the different generation intervals. Timer means for outputting a signal for a predetermined time and resetting the output upon generation of each pulse signal of the pulse signal group to compare the plurality of predetermined times with the generation intervals of the pulse signals; and the timer. A film moving state comprising a moving state signal generating means for detecting and operating the comparison result of the means and for generating and outputting a plurality of moving state signals indicating the moving state of the film in response to the generation state of the pulse signal group. Detection device. 2. An encoder, which is connected to a film winding control system, makes one rotation by winding one frame of the film, and has a plurality of groups of light-transmitting portions and non-light-transmitting portions having different pitches. 2. The film moving state detecting device according to claim 1, comprising a disc and a photo interrupter which generates a pulse signal by detecting the positions of the transparent portion and the non-transparent portion. 3. A movement state signal generating means operates in response to a comparison result of a timer means based on a pulse signal having a short generation interval among pulse signal groups output from an encoder, and a timing signal for data imprinting operation. Of the imprinting timing setting means for forming and outputting, and the pulse signal group,
2. The film movement state detecting device according to claim 1, further comprising winding end detecting means which operates in response to a comparison result of the timer means based on the pulse signal of the final group to form and output a film one frame winding end signal. . 4. An encoder that rotates once in response to the movement of a film of one frame and outputs first and second pulse signals having first and second generation intervals during the rotating operation, The first and second predetermined time signals in consideration of the first and second generation intervals are output, and the outputs are the first and second
Timer means for comparing the first and second predetermined times with the first and second generation intervals by being reset by the generation of the pulse signal, and the first predetermined time by the timer means. By operating in response to the result of comparison with the first generation interval, a timing signal for data imprinting operation is formed and output, and a second predetermined time by the imprinting timing setting means and the timer means and the second A film moving state comprising a moving state signal generating means including a winding end detecting means for forming and outputting a one-frame winding end signal by operating in response to a result of comparison with a generation interval. Detection device.