JPH0534794A - Film feeding drive - Google Patents

Abstract

(57) [Abstract] [Purpose] A film feeding device that reads information recorded on a rotating member that rotates in conjunction with the spool of a film cartridge and detects the presence / absence of a film cartridge in the camera cartridge chamber and a film feeding abnormality. A drive device is provided. A film feed driving device having spool driving means (6, 6a) for driving a spool of a film cartridge loaded in a film cartridge chamber of a camera, and a rotating member (4) rotating on the film cartridge in conjunction with the spool. Information reading means 1 for reading information such as the film sensitivity of the above and outputting a signal corresponding to the read information
Then, within a predetermined time after the spool driving means 6 and 6a starts driving the spool, the information reading means 1
If a signal is not output by, the discriminating means 8 for outputting that the film cartridge is not loaded in the film cartridge chamber is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding drive device for feeding a film by driving a spool of a film cartridge loaded in a film cartridge chamber of a camera.

[0002]

2. Description of the Related Art A film feeding drive device is known in which a spool shaft of a film cartridge is rotated to drive a spool shaft of a film cartridge for feeding a film from the film cartridge.

Further, in this type of film cartridge,
It is conceivable to provide a rotating member such as a disk that rotates in association with the spool shaft and store information such as film sensitivity on the disk.

[0004]

However, in the conventional film feeding / driving device, since no detection device for detecting whether or not the film cartridge is loaded in the film cartridge chamber of the camera is provided, Even when it is not loaded, there is a problem that the feeding motor rotates with the film winding operation and the battery power is wasted.

In order to eliminate such inconvenience, a dedicated cartridge loading detection switch is provided to detect the presence / absence of a film cartridge in the cartridge chamber, or a film detection switch is provided to detect the film to be sent, and indirectly. It is possible to know the presence or absence of a film cartridge. However, in the former case, there is a problem such as installation space, and in the latter case, it is necessary to drive the feeding motor for a certain long time in consideration of the time until the film is sent out from the cartridge, and the battery is wastefully consumed.

It is an object of the present invention to read the information recorded on a rotating member that rotates in conjunction with the spool of a film cartridge to detect the presence / absence of a film cartridge in a cartridge chamber of a camera and a film feeding abnormality. It is to provide a feed drive device.

[0007]

The present invention will be described with reference to FIG. 1, which is a diagram corresponding to claims, and the invention of claim 1 is a spool for driving a spool of a film cartridge loaded in a film cartridge chamber of a camera. It is applied to a film feeding drive device having drive means 6 and 6a. Then, the information reading unit 1 that reads information such as film sensitivity on the rotating member 4 that rotates in association with the spool on the film cartridge and outputs a signal corresponding to the read information, and the spool driving unit 6 and 6a If a signal is not output by the information reading means 1 within a predetermined time after the start of the driving, the discriminating means 8 for outputting that the film cartridge is not loaded in the film cartridge chamber is provided. To achieve the above objectives. According to the invention of claim 2, spool driving means 6 for driving the spool of the film cartridge loaded in the film cartridge chamber of the camera.
It is applied to a film feeding drive device having 6a. Then, information reading means 1 for reading information such as film sensitivity on the rotating member 4 which rotates in association with the spool on the film cartridge and outputting a pulse train-like signal corresponding to the read information, and this information reading means 1 If the next pulse signal corresponding to the information is not output within a predetermined time after the pulse signal corresponding to the information is output by the determination unit 8A, the determination unit 8A that outputs the information indicating the abnormal delivery of the film is provided. To achieve the above objectives.

[0008]

According to the present invention, the discriminating means 8 causes the information reading means 1 to rotate the rotating member 4 within a predetermined time after the spool drive means 6 and 6a start driving the spool.
If the signal corresponding to the information such as the above film sensitivity is not output, it is output that the film cartridge is not loaded in the film cartridge chamber. Further, in claim 2, the discriminating means 8A must output the next pulse signal within a predetermined time after the information reading means 1 outputs the pulse signal corresponding to the information such as the film sensitivity on the rotating member 4. For example, the fact that there is an abnormal delivery of the film is output.

Incidentally, in the section of means and actions for solving the above problems for explaining the constitution of the present invention, the same reference numerals as the elements of the embodiment corresponding to the reference numerals of the respective means are used to make the present invention easy to understand. However, the present invention is not limited to the examples.

[0010]

FIG. 2 is a block diagram showing the configuration of an embodiment,
FIG. 3 is a perspective view of the film cartridge according to the present invention. In the figure, 1 is a photo reflector,
The information of the bar code drawn on the disk 4 which rotates in conjunction with the spool shaft 3 of the film cartridge 2 shown in FIG. 3 is read. Reference numeral 5 denotes a camera back cover switch, which is turned on when the camera back cover is opened and turned off when the camera back cover is closed.
6 is a motor drive circuit, which is a spool drive motor 6a
Is driven to rotate the spool shaft 3. Reference numeral 7 denotes a warning circuit, which gives a warning display on a display (not shown) when the film cartridge 2 is not loaded. At this time, a warning may be given by a buzzer or the like. Reference numeral 8 denotes a control circuit composed of a microcomputer and peripheral parts such as a timer 8a, which performs sequence control and arithmetic processing of the camera and executes a control program described later to control film feeding.

In the structure of the above embodiment, the photo reflector 1 is the information reading means, the disk 4 is the rotating member,
The motor drive circuit 6 and the spool drive motor 6a constitute spool drive means, and the control circuit 8 constitutes discrimination means.

FIG. 4A shows an example of the read signal of the bar code information drawn on the disk 4 output from the photo reflector 1. As shown in FIG. 3, the information of the bar code is drawn radially from the center of the spool shaft 3, and a portion having a short length on the circumference centered on the spool shaft 3 and the short portion Information such as film sensitivity is stored in combination with a long portion having a length equal to or greater than a certain ratio. When the spool shaft 3 is rotationally driven by the spool drive motor 6a and the disk 4 rotates, the photo reflector 1
Reads the bar code information on the disk 4 and outputs an information read signal, that is, a pulse signal of a short pulse Ta and a long pulse Tb corresponding to the bar code information. The control circuit 8 inputs the pulse signal of the photo reflector 1,
Information such as film sensitivity is identified by decoding a combination of two types of pulse signals. Further, FIG. 4B shows an output signal of the photoreflector 1 when the rotation speed of the spool shaft 3 is increased, and the short pulse Tc corresponds to the short pulse Ta of FIG. 4A and the long pulse Td. Corresponds to the long pulse Tb. By measuring the period of these pulse signals, it is possible to detect the change in the rotation speed of the spool shaft 3, that is, the film feeding speed.

5 and 6 are flowcharts showing an example of a control program executed by the control circuit 8. The film feeding operation will be described with reference to these flowcharts.
First, in step S1, it is determined whether or not the back cover of the camera is closed by the switch 5, and if closed, the process proceeds to step S2, and the LED of the photo reflector 1 (hereinafter abbreviated as PR) is energized to turn on the disk 4. Makes the information readable. In step S3, the maximum time from the start of driving the spool shaft 3 to the output of the first pulse signal corresponding to the information on the disk 4 by the photo reflector 1 is set. In step S4, the motor drive circuit 6 is controlled to drive the spool drive motor 6a to start the film feeding operation. In the following step S5, the timer 8
Start a and start timing.

In step S6, it is determined whether or not the read information signal is output from the photo reflector 1, and if the information signal is output, the process proceeds to step S11 in FIG.
Otherwise, go to step S7. In step S7, it is determined whether or not the timer 8a has timed up,
If the time is up, the process proceeds to step S8, and if not, the process returns to step S6. In step S8, driving of the spool drive motor 6a is stopped, and in subsequent step S9,
The driving of the photo reflector 1 is stopped. Further, in step S10, within a predetermined time after the drive of the spool shaft 3 is started,
Since the signal of the read information is not output from the photo reflector 1, it is determined that the film cartridge is not loaded in the film cartridge chamber, and the warning circuit 7 is controlled to warn the display.

On the other hand, when the information on the disk is read within the predetermined time, the timer 8a stops the time counting in step S11 of FIG. 6, and the cycle of the output signal of the photo reflector 1 is stored in the following step S12. To do. In step S13,
The information of the barcode read by the photo reflector 1 is evaluated, and in step S14, the information of the barcode is decoded to identify the content. Step S15
Then, it is determined whether or not the signal period of the photo reflector 1 has changed. If it has changed, the process proceeds to step S16, and if not, the process returns to step S13. When the spool shaft 3 is driven and the film is sent out from the film cartridge 2,
The leading edge of the film reaches the take-up spool of the camera (not shown) and is wound around the take-up spool. Thereafter, the film is wound up by the take-up spool of the camera. Normal,
The film winding speed of the camera take-up spool is set to be higher than the film feeding speed performed by driving the spool shaft 3 so that the leader portion of the film is surely wound around the take-up spool of the camera. Therefore,
When the leader portion of the film winds around the take-up spool of the camera, the feeding speed of the film increases, and the film is pulled by the film and the rotation speed of the spool shaft 3 increases. As a result,
The cycle of the read signal of the barcode information on the disk 4 changes. In step S16, when the read signal cycle of the barcode information is changed and it is detected that the leader portion of the film is wound around the take-up spool of the camera, the feeding motor 6a for driving the spool shaft 3 is driven. The drive system clutch provided between the rotating shaft and the spool shaft 3 is disengaged, and the drive of the spool shaft 3 is stopped. When the spool shaft 3 of the film cartridge 2 and the take-up spool of the camera are driven by separate motors, the spool driving motor of the film cartridge may simply be stopped. In step S17, it is determined whether or not the initial feeding of the film after loading the film cartridge is completed,
When completed, the process proceeds to step S18, and the spool drive motor 6a is stopped.

In this way, the disk 4 which rotates in conjunction with the spool shaft 3 within a predetermined time after the start of driving the spool shaft 3
If the signal corresponding to the above bar code information is not output from the photo reflector 1, it is determined that the film cartridge 2 is not loaded in the film cartridge chamber, and an alarm is issued. It is possible to detect the loading of the film cartridge 2 without providing the film cartridge 2 and to prevent the spool drive motor 6a from idling to drain the battery unnecessarily when the film cartridge 2 is not loaded.

Next, another embodiment for detecting the presence / absence of a film cartridge in the film cartridge chamber and a film feeding abnormality will be described. The configuration of this embodiment is similar to that of the above-described embodiment shown in FIG. 7 and 8 are flowcharts showing an example of the control program. The film feeding operation will be described with reference to these flowcharts. In step S21, switch 5
It is determined whether or not the back cover of the camera is closed. When closed, the process proceeds to step S22, and the driving of the photo reflector 1 is started. In step S23, the maximum time from the start of driving the spool shaft 3 to the output of the first pulse signal corresponding to the information on the disk 4 is set in the timer 8a, as in the above embodiment. Next in step S24
Then, the motor drive circuit 6 is controlled to start driving the spool shaft 3, and in a succeeding step S25, the timer 8a is started to start timing.

In step S26, it is determined whether or not the read information signal is output from the photo reflector 1, and if the information signal is output, the process proceeds to step S28 in FIG. 8, and if not, the process proceeds to step S27. Step S
At 27, it is determined whether or not the timer 8a has timed out, and if so, steps S8 to S10 in FIG. 5 described above are executed, and the film is stored in the film cartridge chamber of the camera as in the above-described embodiment. Cartridge 2
Exits the program with a warning that the is not loaded.

On the other hand, if there is a signal output from the photo reflector 1 in step S26, the timer 8a is stopped in step S28 of FIG. In step S29, the timer 8a is set to a time slightly longer than the maximum time interval of the reading pulse signal of the barcode information, and the time counting is started.
In step S30, it is determined whether or not the pulse signal corresponding to the barcode information is output from the photo reflector 1, and if it is output, the process proceeds to step S31. If not, the process proceeds to step S33. In step S31, the timer 8a is reset, and in the subsequent step S32, the barcode information identification process is performed, and then the process returns to step S29. When the pulse signal corresponding to the barcode information is not output in step S30, it is determined in step S33 whether or not the timer 8a is up, and if it is up, the process proceeds to step S34. If not, the process returns to step S30. Film cartridge 2
Spool shaft 3 with the cartridge loaded in the cartridge chamber
If the time interval of the pulse signal output from the photoreflector 1 is longer than the time set in the timer 8a when the is driven, it is judged that the film is fed out abnormally, and step S34
Then, the spool drive motor 6a is stopped, and the subsequent step S
At 35, the motor drive circuit 6 is controlled to reversely drive the spool drive motor 6a to rewind a part of the film fed from the film cartridge 2. In step S36,
The film is waited for a predetermined time until the film is completely rewound into the film cartridge 2, and the spool drive motor 6a is stopped in the subsequent step S37. And step S
At 38, the warning circuit 7 gives a warning of abnormal film feeding.

In this way, the disk 4 that rotates in conjunction with the spool shaft 3 within a predetermined time after the start of driving the spool shaft 3
If the signal corresponding to the above bar code information is not output from the photo reflector 1, it is determined that the film cartridge 2 is not loaded in the film cartridge chamber to warn, and the pulse signal corresponding to the information indicates the photo reflector 1 If the next pulse signal corresponding to the information is not output within a predetermined time after being output from the It is possible to detect the loading of the cartridge 2 and to detect a delivery abnormality at the time of film delivery promptly after the occurrence of an abnormality, and to prevent the spool drive motor from idling and wasting the battery wastefully.

In the above embodiment, a rotary member such as a disc that rotates in conjunction with the spool shaft of the film cartridge is provided, and whether the bar code information drawn on the rotary member can be read within a predetermined time. The presence or absence of the film cartridge and the abnormal film feeding were detected, but the bar code information was drawn on the protrusion of the spool shaft.
The information may be read by a reading device to detect an abnormality.

In the above embodiment, the bar code information is drawn on the rotating member such as a disk which rotates in conjunction with the spool shaft of the film cartridge so as to be read by an optical method. The information may be stored in the memory and the information may be read using a reproducing device such as a magnetic head. Further, as described above, the magnetic information may be stored in the protruding portion of the spool shaft.

[0023]

As described above, according to the first aspect of the invention, the signal corresponding to the information such as the film sensitivity on the rotating member that rotates in conjunction with the spool within a predetermined time after the start of spool driving. If the information is not output from the information reading unit, the determination unit outputs the fact that the film cartridge is not loaded in the film cartridge chamber. Therefore, without installing a dedicated cartridge loading detection switch, etc. The presence / absence can be detected, and the spool drive motor is not idled wastefully and the battery is not consumed. According to the invention of claim 2, the information reading means responds to the information within a predetermined time after the pulse signal corresponding to the information such as the film sensitivity on the rotating member which rotates in association with the spool is output. If the next pulse signal is not output, the determination means outputs the fact that there is a film feeding abnormality, so that the film feeding abnormality can be detected promptly after the abnormality occurs, and the spool drive motor idles unnecessarily. Does not drain the battery.

[Brief description of drawings]

FIG. 1 is a complaint correspondence diagram.

FIG. 2 is a block diagram showing the configuration of an embodiment.

FIG. 3 is a perspective view of a film cartridge according to the present invention.

4 is a time chart showing a read signal waveform of bar code information on a disk provided in the film cartridge shown in FIG.

FIG. 5 is a flowchart showing an example of a film feeding control program.

FIG. 6 is a flowchart showing an example of a film feeding control program.

FIG. 7 is a flowchart showing another example of a film feeding control program.

FIG. 8 is a flowchart showing another example of a film feeding control program.

[Explanation of symbols]

1 Photo reflector 2 film cartridge 3 spool shaft 4 discs 5 Back cover switch 6 Motor drive circuit 6a Spool drive motor 7 Warning circuit 8 control circuit 8a timer

Claims (2)

[Claims] 1. A film feeding drive device comprising spool drive means for driving a spool of a film cartridge loaded in a film cartridge chamber of a camera, comprising: a rotating member which rotates on the film cartridge in conjunction with the spool. Information reading means for reading information such as film sensitivity and outputting a signal corresponding to the read information, and by the information reading means within a predetermined time after the spool drive means starts driving the spool. If the signal is not output, it is provided with a determination unit that outputs that the film cartridge is not loaded in the film cartridge chamber. 2. A film feeding drive device comprising a spool drive means for driving a spool of a film cartridge loaded in a film cartridge chamber of a camera, the rotation being provided in the film cartridge and rotating in association with the spool. Read information such as the member and film sensitivity on this rotating member,
Information reading means for outputting a pulse train-like signal corresponding to the read information, and a next pulse corresponding to the information within a predetermined time after the pulse signal corresponding to the information is output by the information reading means. If no signal is output, a film feeding drive device is provided, which comprises a discriminating means for outputting information indicating that the film has been fed out abnormally.