JPH086103A - Film information reader - Google Patents

Abstract

PURPOSE:To accurately read bar code information by rewinding a film up to the position of the leading frame when the film goes over the position of the leading frame during the reading of a bar code. CONSTITUTION:A fork 11 engaged with the top end part is provided in the upper part of the top end of a spool 2 in a film cartridge and a photointerrupter 12 is provided on a disk 3 rotated on the spool 2. A switching mechanism 14 changes over the transmitting direction of driving force from a film feeding motor 15 in accordance with the rotational direction of the film feeding motor 15. Thus, the fork 11 or a winding spool 16 provided in a camera is driven via transmitting mechanisms 13a and 13b. In the film 6, its feed rate is detected by the photointerrupter 18 provided in the vicinity of an exposure aperture 17, so as to feed the film by one frame at the time of feeding the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film information reading apparatus for a camera using a film cartridge which rotates integrally with a spool in a film cartridge and which has a recording disk on which information about the film is encoded and recorded. is there.

[0002]

2. Description of the Related Art In a camera using a film cartridge having a disk which rotates integrally with a spool in a film cartridge and records information about the film as bar code information, the bar code information is fed while the film is being fed. The method of reading
For example, it is disclosed in US Pat. No. 5,032,854.

[0003]

A bar code is read while feeding a film by using a motor. However, when the feeding of the film is started, the speed of the bar code fluctuates so much that a reading error occurs. Had challenges. Therefore, even in the above-mentioned US Pat. No. 5,032,854, in consideration of this problem, after starting film feeding,
The bar code reading is started after the film feeding speed becomes stable after a lapse of a predetermined time.

By the way, in the camera, the film feeding speed, that is, the rotation speed of the disk on which the bar code is recorded, varies greatly in the following cases. (A) Time required for the motor to rise to a stable rotation speed at the start of driving the motor.

(B) A time period during which the leading edge of the film passes the front surface of the exposed opening. At the front of the exposure opening, there is a constriction area sandwiched between the film rail surface and the pressure plate that presses the film from the rear, and the load on the motor becomes heavy during the time when the film leading edge passes through this constriction area. The speed fluctuates sharply.

(C) A time period from when the film front end portion starts to be wound around the film winding spool of the camera until it is completely wound up. Therefore, there is some variation in the feeding speed between the feeding of the film and the winding of the leading end of the film onto the film take-up spool of the camera.
For safety reasons, it is desirable to start reading the bar code after these periods. However, when the reading of the bar code is started after waiting for the leading end of the film to wind around the film take-up spool of the camera in this way, the following problems occur.

(I) The length of the leader portion of the film (the portion from the leading end of the film to the leading frame of the film) is not infinitely long. It has a finite length due to the manufacturing cost of the film.

(Ii) The film must be fed to some extent to read the bar code. (iii) The film feeding speed varies depending on various conditions. For example, the hardness of the film changes due to changes in temperature and humidity. Therefore, the load of the drive motor varies depending on the conditions. It also varies depending on the degree of battery consumption.
Therefore, even under bad conditions (when the film feeding speed is slow), it is necessary to set the time until the leading end of the film is sufficiently wound around the film take-up spool of the camera.

For the reasons (i) to (iii) above, if the bar code reading is started after a sufficient time has passed, there is a possibility that when the bar code is read, it will exceed the leading edge of the film. is there.

The present invention has been made in view of the above-mentioned problems. Even when the film is fed beyond the position of the leading frame of the film during the reading of the bar code, the number of photographic images peculiar to the film can be secured. An object of the present invention is to provide a film information reading device that can be used.

[0011]

SUMMARY OF THE INVENTION That is, the present invention uses a film cartridge having a recording disk that rotates integrally with a spool in a film cartridge and in which information about the film is coded and recorded together with a start bit. In the camera, drive means for rotating the spool in the film cartridge in the film feeding direction, and reading of the information recorded on the recording disk while the recording disk is being rotated by the driving means Information reading means and the fact that the film cartridge is loaded in the camera, the driving means is operated, and then the information reading means is operated, and the information reading means outputs a predetermined number of the start bits. After detecting
And an information reading control means for starting the reading of information on the film.

Further, the present invention relates to a camera using a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information relating to the film is encoded and recorded. Drive means for rotating the recording disk in the film feeding direction, information reading means capable of reading the information recorded on the recording disk while the recording disk is being rotated by the driving means, and the film cartridge. The information reading control means for operating the information reading means to start the reading of the information on the film after detecting that it is loaded in the Checking means to check and the position of the first piece by this checking means If it is determined that the beyond is characterized by comprising a first frame positioning means to rewind the film until the first frame position.

Further, the present invention is a camera that uses a film cartridge having a recording disk that rotates integrally with a spool in the film cartridge and records information relating to the film in a symbolized manner. Drive means for rotating in the film feeding direction, information reading means capable of reading the information recorded on the recording disk while the recording disk is being rotated by the driving means, and the film of the film cartridge. Checking means for checking the number of feeding frames, and detecting that the film cartridge is loaded in the camera, operating the driving means, and detecting that the checking means has reached the leading frame of the film. Read the information about the film by operating the information reading means. And characterized by including an information reading control means to start Ri.

[0014]

In the film information reader of the present invention,
In a camera using a film cartridge having a recording disk that rotates integrally with a spool in the film cartridge, and information about the film is encoded and recorded together with a start bit, the spool in the film cartridge is driven. It is rotated in the film feeding direction by the means. Then, during the rotation of the recording disk by the driving means, the information reading means reads the information recorded on the recording disk. When the information reading control means detects that the film cartridge is loaded in the camera, the driving means is operated and then the information reading means is operated, and the information reading means outputs a predetermined number of the start bits. After detection, the reading of information about the film is started.

Further, according to the present invention, in a camera using a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information on a film is encoded and recorded, the film cartridge The inner spool is rotated in the film feeding direction by the driving means. The information recorded on the recording disk is read by the information reading means while the recording disk is being rotated by the driving means. When the information reading control means detects that the film cartridge is loaded in the camera, the driving means is operated and then the information reading means is operated to start the reading of the information on the film. Further, the number of film feed frames of the film cartridge is checked by the checking means, and if it is determined by the checking means that the number of film feed frames is beyond the leading frame position, the leading frame positioning means determines that the film is the leading frame. It is rewound to the position.

Further, according to the present invention, there is provided a camera using a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information relating to the film is encoded and recorded. The inner spool is rotated in the film feeding direction by the driving means. Then, during the rotation of the recording disk by the driving means, the information reading means reads the information recorded on the recording disk. The number of film feed frames of the film cartridge is checked by the checking means, and when it is detected by the information reading control means that the film cartridge is loaded in the camera, the driving means is operated to cause the checking means to operate the film. After it is detected that the leading frame of the film has been reached, the information reading means is operated to start reading information on the film.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information regarding the film is encoded and recorded.

In FIG. 2A, the spool 2 is housed in the case 1 of the film cartridge, and the upper end of the spool 2 is visible on the case 1. Above spool 2
The upper part has a structure such that a hawk provided on the camera side can be engaged to rotate the spool 2. Also, on the upper surface of the spool 2, around the upper end,
A disk 3 is provided in which information about the film is recorded as bar code information. The disc 3 is integrally formed with the spool 2 in the film cartridge.
In the above bar code, the start bit 4 is wider than other bar code patterns. In addition, 5 is a slit for sending out the film.

FIG. 2B is a sectional view of the film cartridge. The state in which the film 6 is wound on the spool 2 is displayed in the film cartridge.
FIG. 2 (c) shows a state in which the leading end of the film is pulled out from the inside of the film cartridge. Figure 2
In (c), an exposure portion 8a corresponding to the leading frame is provided at a position separated from the front end portion 7 of the film 6 by a predetermined distance L, and exposure corresponding to the second frame, the third frame ,. Part 8
b, 8c, ... Are provided. Further, in order to position the exposure portions 8a, 8b, 8c, ... Corresponding to the respective frames at predetermined positions on the camera side, square holes (perforations) 9a, 9b, 9c, ... Are formed on the film 6. Has been done. Incidentally, 10 is the leading edge of the leading frame.

FIG. 1 is a diagram schematically illustrating a mechanical portion of a camera to which the film information reading device of the present invention is applied. FIG. 1A is a view of the mechanical portion as seen from the rear surface, and FIG. 1B is a view of the same portion as seen from above. FIG.
In (a), spool 2 in the film cartridge
Above the upper end of the fork is provided a fork 11 which engages with the upper end. A photo interrupter 12 for reading the bar code recorded on the disk 3 is provided on the disk 3 rotating on the spool 2. The hawk 11 is connected to the switching mechanism 14 via the transmission mechanism 13a.

The switching mechanism 14 includes a film feeding motor 15
The transmission direction of the driving force from the film is switched according to the rotation direction of the film feeding motor 15. As a result, either the hawk 11 or the take-up spool 16 for taking up the photographed film provided in the camera is driven via the transmission mechanisms 13a and 13b. In addition, 17 represents a portion corresponding to the exposed opening, and 18 represents 1 when the film is fed.
A photo interrupter for detecting the feeding amount of the film 6 to feed the film 6 by the number of frames is shown.

Now, when the film feeding motor 15 rotates in the first direction, the switching mechanism 14 and the transmission mechanisms 13a, 1
The action of 3b causes the hawk 11 and the winding spool 16 in the camera to rotate in the CW (clockwise) direction when viewed from above, as shown in FIG. 1 (b). When the film feeding motor 15 is rotated in the first direction with the film cartridge loaded in the camera, first, the hawk 1
By rotating 1 in the CW direction, the film 6 is sent out from the film cartridge. Then, when the leading end portion 7 of the film 6 winds around the winding spool 16, C of the spool 16
The film 6 is wound around by rotating in the W direction.

Here, the transmission mechanisms 13a and 13b and the switching mechanism 14 are set so that the film winding speed by the rotation of the winding spool 16 is faster than the film feeding speed by the rotational force of the hawk 11.
Therefore, after the film 6 is wound around the winding spool 16, the hawk 11 and the transmission mechanism 1 are moved by the film 6.
Although 3a is pulled, the transmission mechanism 13a is designed to be able to idle in the CW rotation direction so as to absorb the difference in film feeding speed between the two.

On the other hand, when the film feeding motor 15 is rotated in the second direction opposite to the first direction, the hawk 11 moves in the CCW (counterclockwise) direction by the action of the switching mechanism 14 and the transmission mechanisms 13a and 13b. Rotate to. Further, the winding spool 16 is in a state in which it can be freely idled, and the film 6 wound on the winding spool 16 can be rewound into the film cartridge.

The photo interrupter 18 includes a light emitting section 1
8a and the light receiving part 18b. The required amount of film 6 is fed at the time of automatic loading after film transfer or after winding after shooting, and the perforations 9a, 9
When the leading edge of b, ... Has reached the front surface of the photo interrupter 18, the driving of the film feeding motor 15 is stopped.

FIG. 3 is a block diagram showing the control circuit. In FIG. 3, the control microcomputer 19 includes
A booster circuit 21 for boosting the voltage of the power supply battery 20 to generate a constant voltage is connected. This booster circuit 21
Are connected to the VCC terminal of the microcomputer 19. Further, one end of the rear cover detection switch 23 for detecting the opening / closing of the rear cover of the camera is connected to the microcomputer 1
It is connected to the C1 input terminal of 9 and is pulled up by the resistor 22. Although not shown, the camera of this embodiment has a rear lid for loading and unloading the film cartridge. The rear lid detection switch 23 is
When the rear lid is open, it is turned on, and when the rear lid is closed, it is turned off.

The C2 output terminal of the microcomputer 19 is connected to the anode of the light emitting diode 25 in the photoreflector 12 for reading the bar code 3 provided on the film cartridge via the current limiting resistor 24. It The C3 input terminal of the microcomputer 19 is connected to the collector of the phototransistor 26 in the photoreflector 12 and the pull-up resistor 27.

Furthermore, 19 C4 of the microcomputer
The output terminal is the anode of the light emitting diode 29 (light emitting portion 18a) of the photo interrupter 18 for detecting the film feeding amount through the current limiting resistor 28, and the C5 input terminal is the photo interrupter 18 of the photo interrupter 18. The collector of the phototransistor 30 (light receiving portion 18b) is connected. The collector of the phototransistor 30 is connected to the VCC terminal of the microcomputer 19 together with the pullup resistors 22 and 27 via the pullup resistor 31.

C6, C7 of the microcomputer 19,
C8 and C9 output terminals are connected to base resistors 32 and 3, respectively.
Bridge transistors 36, 37, 38 for driving the film feeding motor 15 via 3, 34, 35,
It is connected to the base of 39. The emitters of the bridge transistors 36 and 37 and the bridge transistor 38
And the emitters of 39 are connected to each other,
The collectors 6 to 39 are all film feeding motors 15
Connected to.

Further, C1 of the microcomputer 19
0, C11, C12 output terminals are the film feeding motor 1
In order to drive 5 at a constant voltage, it is connected to an inverting input terminal of an operational amplifier 41 via a constant voltage output circuit 40 for generating a constant voltage. The output terminal of the operational amplifier 41 is connected to the base of a PNP type transistor 42,
The non-inverting input terminal is connected to the collector of transistor 42 and the emitters of transistors 38 and 39. The emitter of the transistor 42 is connected to the power battery 20 and the booster circuit 21.

The other end of the back cover detection switch 23, the cathode of the light emitting diode 25, the emitter of the phototransistor 26, the cathode of the light emitting diode 29, the emitter of the phototransistor 30, and the bridge transistors 36, 3 are provided.
The emitter of 7 and the negative side of the power supply battery and the GND terminal of the microcomputer 19 are grounded.

The constant voltage output circuit 40 generates a constant voltage according to a control signal from the output terminals C10 to C12 of the microcomputer 19. As a result, the operation of the operational amplifier 41 and the transistor 42 fixes the upper end of the bridge transistor for driving the motor to a predetermined constant voltage.

When the film feeding motor 15 is rotated in the first direction, the C8 output terminal of the microcomputer 19 is set to the "L (low)" level and the C6 output terminal is set to the "H (high)" level. And transistors 38 and 3
Turn 7 on. At this time, the C9 output terminal is set to "H" level, the C7 output terminal is set to "L" level, and the transistors 36 and 39 are turned off.

When the film feeding motor 15 is rotated in the second direction, C of the microcomputer 19 is used.
The 9th output terminal is set to "L" level and the C7 output terminal is set to "H" level to turn on the transistors 39 and 36. At this time, the C8 output terminal of the microcomputer 19 is set to "H" level, the C6 output terminal is set to "L" level, and the transistors 38 and 37 are turned off.

Further, when the film feeding motor 15 is stopped, the C6 and C7 output terminals are set to "H" level to turn on the transistors 37 and 36, and the film feeding motor 15 is short-circuited. At this time, C8 and C9
The output terminal is set to "H" level and the transistors 38 and 3
9 is turned off.

Next, referring to the flowchart of FIG.
The operation of the embodiment will be described. The flowchart of FIG.
The photographer opens the rear lid of the camera to load the film cartridge, closes the rear lid, and then the camera reads the bar code on the film cartridge to complete the autoloading.

First, in step S1, the microcomputer 19 monitors the C1 input terminal, and when it switches from "L" to "H", it judges that the rear lid is closed and proceeds to step S2. Also, in step S1, "L"
If it is not switched from "H" to "H", the determination of step S1 is repeated. In step S2, the microcomputer 19
Sends a control signal to the constant voltage output circuit 40 to set a predetermined constant voltage. Next, in step S3, the C8 output terminal is set to "L" and the C6 output terminal is set to "H" to start driving the film feeding motor 15 in the first direction.

Next, in step S4, the C2 output terminal is set to "H" to activate the light emitting diode 25, and in step S5, the C4 output terminal is set to "H" to activate the light emitting diode 29. Then, in step S6, a 100 msec timer is operated. This timer is a waiting time until the rotation speed of the motor 15 rises and stabilizes.

In step S7, the film frame number counter M is set to 0, and in the following step S8, the loop counter N is set to 0. Next, in step S9, the start bit is detected. As shown in FIG. 2 (a),
Bar code 3 has a start bit 4,
The bit pattern has a wider width than other bit patterns and is painted black. The above-mentioned step S6 is a step of reading this start bit while distinguishing it from other bits.

FIG. 5 is a subroutine for explaining the details of the start bit detection in step S9. In FIG. 5, the timer TM1 is first reset and started in step S31, and then the C3 input terminal is monitored in step S32. If "L" is switched to "H", the process proceeds to step S33 to reset and start the timer TM2. The timer TM2 is a timer for counting the pulse width.

Next, in step S34, the C3 input terminal is monitored, and if "H" is switched to "L", the process proceeds to step S37 to stop the timer TM2. Next, in step S38, the count value of the timer TM2 is compared with a predetermined value TST, and when TM2 ≧ TST, it is determined that the start bit is read, and then the timer TM1 is stopped and returned in step S39. . On the other hand, in step S38, TM2 <TS
In the case of T, it is determined that it is not the start bit, and the process returns to step S32.

If the C3 input terminal is not switched from "L" to "H" in step S32, step S32 is executed.
In step 40, the count value of the timer TM1 and the predetermined value T
Compare with MAX. If TM1 <TMAX, the process proceeds to step S41 to monitor the C5 input terminal. When the C5 input terminal is switched from "H" to "L", the value of the film frame number counter M is incremented by 1 in step S42. The reason for this is that, when the film feed advances during execution of the sequence shown in FIG. 5 and the film advances beyond the position of the leading frame, the excess number of frames is stored and later wound to the position of the leading frame. This is to bring it back.

Here, the photo interrupter 18 described above is used.
The amount of transmitted light is small while the light emitting portion 18a and the light receiving portion 18b are blocked by the film, but the amount of transmitted light increases when the perforations 9a, 9b, ... "" To "L". After step S42, the process returns to step S32. Also, if the C5 input terminal is not switched from "H" to "L" in step S41, the process returns to step S32.

In step S40, TM1 ≧ T
In the case of MAX, the process proceeds to step S43, and the timer TM1
Stop. Then, the motor drive is turned off in step S44, the C2 output terminal is set to "L" in step S45, and the light emitting diode 25 is turned off. Then, in step S46, the C4 output terminal is set to "L" to turn off the light emitting diode 29. Next, in step S47, a warning display indicating that there is no film is displayed on the display element outside the camera. Then, the process returns to step S1 in FIG.

If the photographer does not load the film cartridge and closes the rear lid, the bar code cannot be read, and therefore the sequence from step S40 to step S47 is performed.

If the C3 input terminal is not switched from "H" to "L" in step S34, the process proceeds to step S35. This step S35 and step S36
The processing of step S41 and step S42 described above
The description is omitted here.

When the start bit is detected in this way, the process returns to FIG. 4 and proceeds to step S10. In this step S10, the loop counter N is incremented by +1. Then, in step S11, if N = 2, the process proceeds to step S12, and if N <2, the process returns to step S9. In this case, the start bit is read twice by the sequence of steps S9 to S11.

That is, according to this sequence, the disk 3 in the film cartridge 1 rotates at least twice or more, and the film 6 corresponding to this rotation is sent out from the film cartridge through the slit 5. This film feed amount is the feed amount required for winding the film front end portion 7 around the spool in the camera. Therefore, in the sequence after step S12, since the film front end portion 7 is wound around the spool, the number of rotations of the film feeding motor 15, that is, the film feeding speed is in a stable state, and the reading of the bar code is correct. become able to.

Instead of the sequence of steps S9 to S11, there is also a method of reading the bar code after waiting for a certain period of time, but in this method, as described above, the film feeding speed fluctuates depending on various conditions and bad conditions ( If the waiting time is set according to the case where the film feeding speed is slow), the film feeding amount during this waiting time becomes unreasonably long under good conditions (when the film feeding speed is fast). Therefore, if N = 2 in step S11, the process proceeds to step S12.

Here, in step S9, the pulse width of the start bit is measured at the time of reading the start bit and stored in the timer TM2, but in step S12, the start bit is followed by other values based on the count value of TM2. Set the time judgment standard for the bit. The bar code pattern provided on the film cartridge used in the embodiment is white, black, white,
... and the pattern continues. There are two types of these patterns, a white pattern and a black pattern, a wide pattern and a narrow pattern. This pattern is step S1
In step 3, reading is performed to determine the length of the pulse width.

However, if the threshold value for judging the pulse width is set to a fixed value, the following problems occur. That is, the number of rotations of the motor fluctuates depending on the degree of consumption of the power supply battery of the camera, the ambient temperature and humidity, the variation of mechanical parts, and the like. Therefore, due to these fluctuation factors, there is a possibility that the fixed threshold value makes a wrong determination.

FIG. 6 is a subroutine for explaining the details of step S12. First, in step S51, if the count value of TM2 is larger than the predetermined value TM2A, the process proceeds to step S52, and the predetermined value TTHA is set to TTH.
Store and return. Next, in step S53, it is determined whether the count value of TM2 is TM2B or more, and if it is TM2B or more and less than TM2A, the process proceeds to step S54 to store TTHB in TTH and return. Furthermore, when the count value of TM2 is less than TM2B in step S53, the process proceeds to step S55.
Store THC in TTH and return.

Here, the constants are set so that TTHC <TTHB <TTHA. That is, in the flowchart of FIG. 6, the rotation speed of the motor is divided into three stages according to the count value of TM2, and the value of TTH is set according to those rotation speeds.

Returning to FIG. 4 again, after step S12,
In step S13, the barcode is read. Details of step S13 will be described with reference to the flowchart of FIG.

First, in step S61, the loop counter I is set to 0. Then, in step S62, the timer T
After resetting and starting M3, the state of the C3 input terminal is monitored in step S63. Where C
If the state of the three input terminals has changed, the process proceeds to step S66, and the count of the timer TM3 is stopped.

Next, in step S67, the count value of TM3 is compared with TTH. Where TM3 ≧ TTH
If so, it is determined to be a long pulse, and the process proceeds to step S68 to store 1 in the Y (I) flag. Also, TM3 <
If it is TTH, it is determined that the pulse is short, and step S6 is performed.
The process proceeds to 9 and 0 is stored in the Y (I) flag. Then, in step S70, if I = 11, the process returns.
If I = 11 is not satisfied, the process proceeds to step S71 to increment I by 1, and then returns to step S62.

In step S63, C3
If the state of the input terminal has not changed, step S64
And monitor the C5 input terminal. Here, when the C5 input terminal is switched from "H" to "L", the process proceeds to step S65 and the value of the film frame number counter M is incremented by one. The reason for this is that if the film feed advances during execution of the sequence shown in FIG. 7 and the film advances beyond the position of the leading frame, the excess number of frames is stored and later the position of the leading frame is reached. This is to rewind.

Thus, after step S65, the process returns to step S63. Also, if the C5 input terminal is not switched from "H" to "L" in step S64, the process returns to step S64.

As described above, by passing through the bar code reading flowchart shown in FIG. 7, in step S13, 12 pieces of pattern information following the start bit are read and the Y (0) to Y (11) flags are set. Remember.

Returning to FIG. 4, in step S14, the motor constant voltage VM is set to VM2. This VM2 is a voltage higher than the constant voltage VM1 set in step S2. When reading the bar code, it is convenient that the drive voltage of the film feeding motor is low. The reason is that if the driving voltage is too high, the number of rotations of the motor becomes high and the bar code information may be missed. Also, for the convenience of the circuit, the output voltage of the motor constant voltage output circuit 40 is
It cannot be set to a voltage higher than the output voltage of the power battery 20.
The output voltage of the power supply battery 20 may considerably decrease due to the degree of battery consumption and the influence of temperature and humidity. Further, the power supply battery 20 is changed by the fluctuation of the driving load of the film feeding motor 15.
Output voltage fluctuates, but VM1 is set to a low value so that the driving voltage of the film feeding motor 15 does not fluctuate even if these fluctuations occur.

On the other hand, after the reading of the bar code, there is no problem even if the number of rotations of the film feeding motor 15 fluctuates a little, so the motor constant voltage is set high. Next, step S
When the value M of the film frame number counter is 0 in 15, the film is not fed to the position of the leading frame by the end of reading the bar code, and therefore the film is further fed. That is, the process proceeds to step S16, the C5 input terminal is monitored, and if "H" is switched to "L", the process proceeds to step S17 to turn off the motor drive. Then, in step S18, the short brake is applied to the motor.

In this short brake, the C6 and C7 output terminals are set to the "H" level, the transistors 36 and 37 are turned on, and the film feeding motor 15 is turned on.
Operates a timer of 0 msec. Then C6 and C
7 output terminal is set to "L" level, and the transistor 36,
Turn off 37. Then, in step S19, the C2 output terminal is set to "L" to turn off the light emitting diode 25, and in step S20, the C4 output terminal is set to "L" to turn off the light emitting diode 29, and this sequence is ended.

On the other hand, if the value M of the film frame number counter is not 0 in step S15, the film has been wound up to the position of the leading frame because the position of the leading frame has been exceeded by the end of reading the bar code. Put it back. That is, the motor drive is turned off in step S21, and the motor short brake is applied in step S22. Next, in step S23, the loop counter L is set to 0, and in step S24, the second film feeding motor 15 is set to the second position.
Start driving in the direction.

Next, in step S25, the C5 input terminal is monitored. Here, if "L" is switched to "H", the process proceeds to step S26 and the loop counter is set to 1
Just add. Then, in step S27, L =
If M, the process proceeds to step S17, and at step S27 L
If M, return to step S25.

Next, a second embodiment of the present invention will be described. In the second embodiment, the sequence shown in FIG. 8 is performed after step S12 of the flowchart of FIG. 4 in the above-described first embodiment, and then the process returns to step S14 of FIG.

When TTH is determined in step S12,
Next, in step S81, the loop counter H is set to 0. Then, in step S82, the barcode is read. Step S501 is the same as the sequence shown in FIG.

Next, in step S83, Y (0) -Y
(11) Set the information stored in the flag to Y _A(0) to Y
_A(11) Transfer to the flag. Then, step S84
Then, the bar code is read again. Step S85
Then, the information stored in the Y (0) to Y (11) flags
To Y_B(0) to Y_B(11) Transfer to the flag. Soshi
Then, in step S86, Y_A(0) to Y_A(1
1) Information stored in the flag and Y_B(0) to Y_B(1
1) Compare the information stored in the flags. Where the match
If so, it is determined that the barcode information was read normally.
Then, the process proceeds to step S14 in the flowchart of FIG.

On the other hand, if they do not match in step S86, the process proceeds to step S87 to read the bar code again. Then, in step S88, Y _B
(0) to Y _B (11) The information stored in the flag is Y
Transferred to the _{A (0) ~Y A (11} ) flag. Next, in step S89, Y (0) to Y (11) information stored in the flag, and transfers the Y _B (0) to Y _B (11) flag.

Then, in step S90, the loop counter H is incremented by 1. Then, in step S91, if H = 10, it is determined that the bar code reader is out of order. That is, the motor drive is turned off in step S92, and the drive of the film feeding motor 15 in the second direction is started in step S93. Then, in step S94, a 3-second timer is operated.

When the motor drive is turned off in step S95, the C2 output terminal is set to "L" in step S96 to turn off the light emitting diode 25. Then, in step S97, the C4 output terminal is set to "L" to turn off the light emitting diode 29. Then, in step S98, a failure display is displayed on the display element outside the camera, and in step S9 of FIG.
Return to 1.

As described above, in the second embodiment, the bar code information is read twice, and if they match, it is determined that the bar code information is normal, and the process proceeds to the next step. Even if noise is generated in the control circuit system during the reading of the barcode and the reading is mistaken, this erroneous reading can be eliminated.

In the second embodiment described above, an error in information is detected by reading the information twice.
The error of information may be detected by another method. For example, a method of detecting an information error by checking an impossible combination of information or a number of switching edges (at the C3 input terminal) from the end point of a start bit to the start point of the next start bit There is a method of counting and, if it is not within the range of the predetermined count value, a method of making an error in the information, a method of detecting an abnormally long pulse or an abnormally short pulse, and making an error in the information if there are these. Conceivable.

Further, in the flow chart of FIG. 8 of the second embodiment, if the bar code is read 10 times in succession and the bar code cannot be read even after that, the camera side or the film cartridge side has to do something. It is judged that there was a breakdown. In this case, the failure display may be performed after rewinding the film and rewinding all the film pulled out from the film cartridge into the film cartridge.

FIG. 9 is a flow chart for explaining the operation of the third embodiment of the present invention. In FIG. 9, first, in step S101, the opening / closing of the rear lid is detected, and then in step S102, driving of the film feeding motor 15 in the first direction is started. Next, in step S103, C2, C
4 output terminals are set to "H", and the light emitting diodes 25, 29
To the operating state. Then, in step S104, the C5 input terminal is monitored. Here, when the state of the C5 input terminal is switched from "H" to "L" level, that is, when the position of the leading frame is detected, the process proceeds to step S105.

In step S105, the film frame number counter M is set to 0, and then in steps S106 to S10.
Do 8. These steps S106, S107, S10
8 is steps S9, S12,
Since it is the same as S13, the description is omitted here.

Next, in step S109, the drive of the film feeding motor 15 is turned off, and in step S110, the process shown in FIG.
The motor short brake is performed in the same manner as in step S18. Then, in step S111, the loop counter L
Is set to 0. Then, steps S112 to S115
Sequence is performed to rewind the film that has gone too far from the first frame to the position of the first frame. These steps S112-
The sequence of S115 is the same as steps S24 to S2 in FIG.
Since it is the same as the sequence of No. 7, description will be omitted.

Next, in step S116, the motor drive is turned off, and in step S117, the motor short brake is performed. Then, in step S118, C2, C4
The output terminal is set to "L" level, and the light emitting diode 25,
29 is turned off, and this sequence ends.

In addition, the second embodiment described above is added to the third embodiment.
It is also possible to operate by combining the sequences shown in FIG. According to the above embodiment of the present invention, the following configuration can be obtained.

(1) In a camera that uses a film cartridge having a recording disk that rotates integrally with a spool in the film cartridge and records information relating to the film in a symbolized manner, with the rotation of the recording disk. , Information reading means for reading information about the film stored on the rotating recording disk, motor driving means for rotating the spool in the film cartridge in the film feeding direction, and the film cartridge for the camera. An information reading control means for detecting the loading, operating the motor driving means, operating the information reading means and detecting a predetermined Nth start bit, and then starting the information reading. A film information reading device characterized in that

(2) The information reading control means measures the pulse width of the start bit at the time of reading the start bit, and based on this pulse width, information for setting the time judgment standard of the information following the start bit. The film information reading device according to (1) above, which has a reading reference setting unit.

(3) In a camera using a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information on film is symbolically recorded, the rotation of the recording disk is accompanied by , Information reading means for reading information about the film stored on the rotating recording disk, motor driving means for rotating the spool in the film cartridge in the film feeding direction, and the film cartridge for the camera. After the loading is detected and the motor driving means is operated, the reading control means starts reading information, and the information reading control means starts reading the information until the information reading is completed. And a motor drive voltage control means for driving the motor drive means at a constant voltage. Film information reading apparatus characterized by comprising a.

(4) The film information reader according to (3), wherein the motor drive voltage control means increases the drive voltage of the motor drive means after the reading of the information is completed.

(5) In a camera using a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information on the film is encoded and recorded, as the recording disk rotates, , Information reading means for reading information about the film stored on the rotating recording disk, motor driving means for rotating the spool in the film cartridge in the film feeding direction, and the film cartridge for the camera. Information reading control means for starting information reading after detecting the loading and operating the motor driving means, and information error detecting means for detecting an error in the information read by the information reading means A film information reading device comprising:

(6) When the information error detecting means detects an information error, the information reading control means repeatedly reads the information up to a predetermined number of times, and as a result, the information can be read. If not, the film information reading device according to (5) above, which stops reading the information.

(7) The film information reading apparatus as described in (6) above, wherein when the reading of the information is stopped, the film is rewound after the reading is stopped. (8) The information error detection means repeatedly reads the information, and when the information read twice consecutively does not match, the read information is determined to be erroneous. Film information reader.

(9) In a camera using a film cartridge having a recording member on which film information is recorded, which is integrally formed with the spool shaft of the film cartridge, the film information is optically read when the spool shaft is rotated. Possible reading means, detecting means for detecting that the film has been fed from the film cartridge to a predetermined position, and reading information by the reading means after detecting that the film has been moved to the predetermined position by the detecting means. A film information reading device, comprising:

(10) The film information reading device as described in (9) above, wherein the detection means detects the position of the hole formed in the film by detecting the position of the hole. (11) In a camera that uses a film cartridge having a recording member on which film information is recorded and that is formed integrally with the spool shaft of the film cartridge, the film information can be read optically when the spool shaft rotates. Means, a detecting means for detecting a moving amount of the film from the film cartridge, and a moving amount of the film read by the detecting means when the reading of the film information by the reading means is completed, a predetermined amount. A film information reading apparatus comprising: a rewinding control unit that rewinds the film to a predetermined position when it is detected that the film is over.

According to the above-mentioned embodiment (1), since the information reading is started after the predetermined Nth start bit is detected, the information reading can be carried out in the state where the rotation of the recording disk is stable. According to the embodiment of the above (2), since the time judgment standard for reading information is set according to the rotation state of the recording disk, accurate reading can be performed. According to the embodiment of the above (3), since the motor is driven with a constant voltage, the recording disk is stably rotated, and the information can be read accurately. According to the embodiment of (4) above, since the driving voltage is increased after reading the information,
The film can be driven at high speed. Above (5)
According to this embodiment, since error detection is performed, erroneous information is not read. According to the embodiment of (6), it is possible to prevent the information from being read infinitely without being able to read the information accurately. According to the above embodiment (7), since the film rewinding is performed after the information reading is stopped, the information reading cannot be performed and the photographing operation is not started. According to the embodiment of (8), the information error can be detected by a simple method. According to the embodiment of (9) above,
Information can be read while the rotation of the recording member is stable. According to the embodiment of (10) above, it is possible to accurately detect based on the film hole. Above (11)
According to this embodiment, after the film information has been read, it is possible to shoot from a predetermined position.

[0089]

As described above, according to the present invention, even when the film is fed beyond the position of the leading frame of the film during the reading of the bar code, the rewinding of the portion beyond the leading frame after that is performed. Since this is done, it is possible to secure the number of shootable images specified in the film cartridge.

[Brief description of drawings]

1A and 1B are schematic views for explaining a mechanical portion of a camera to which a film information reading device of the present invention is applied, FIG. It is the figure which looked at from above.

FIG. 2 shows an example of a film cartridge having a recording disk that rotates integrally with a spool in the film cartridge and records information about the film in a symbolized manner. (A) is an external view of the film cartridge Perspective view, (b) is a sectional view of the film cartridge,
FIG. 7C is a diagram showing a state in which the leading end of the film is pulled out from the inside of the film cartridge.

FIG. 3 is a configuration diagram showing a control circuit in a first embodiment of the present invention.

FIG. 4 is a flowchart explaining the operation of the first embodiment of the present invention.

5 is a subroutine for explaining details of start bit detection in step S9 of the flowchart of FIG.

FIG. 6 is a subroutine for explaining details of step S12 in the flowchart of FIG.

FIG. 7 is a subroutine for explaining details of step S13 in the flowchart of FIG.

FIG. 8 is a flow chart for explaining the operation of the second embodiment of the present invention.

FIG. 9 is a flow chart for explaining the operation of the third embodiment of the present invention.

[Explanation of symbols]

 1 Case of film cartridge 2 Spool 3 Disc 3 4 Start bit 5 Slit 6 Film 7 Tip part 8a, 8b, 8c Exposure part 9a, 9b, 9c Hole (perforation) 11 Hawk 12,18 Photo interrupter 13a, 13b Transmission mechanism 14 Switching Mechanism 15 Film feeding motor 16 Winding spool 17 Exposure opening 18a Light emitting part 18b Light receiving part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location G03C 3/00 599 B G06K 7/00 R 7623-5B (72) Inventor Yoji Watanabe Shibuya-ku, Tokyo 2-43-2 Hatagaya, Olympus Optical Co., Ltd.

Claims (3)

[Claims] 1. A camera using a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information about the film is encoded and recorded together with a start bit. Drive means for rotating the spool in the film feeding direction, information reading means capable of reading the information recorded on the recording disk while the recording disk is being rotated by the driving means, and the film cartridge. Is loaded in the camera, the drive means is operated, and then the information reading means is operated, and after the information reading means detects a predetermined number of the start bits, A film comprising: an information reading control means for starting reading. Broadcast reader. 2. A camera using a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information about the film is encoded and recorded, wherein the spool in the film cartridge is A drive means for rotating in the feeding direction, an information reading means capable of reading the information recorded on the recording disk while the recording disk is being rotated by the driving means, and the film cartridge are loaded in the camera. After that, the information reading control means for operating the information reading means to start the reading of the information on the film after operating the driving means, and a check for checking the number of film feeding frames of the film cartridge Means and this check means exceed the position of the first frame Preparative if it is determined, the first frame and the first frame positioning means to rewind the film to the position, the film information reading apparatus characterized by comprising a. 3. A camera using a film cartridge having a recording disk which rotates integrally with a spool in the film cartridge and in which information about the film is encoded and recorded, wherein the spool in the film cartridge is Driving means for rotating in the feeding direction, information reading means capable of reading the information recorded on the recording disk while the recording disk is being rotated by the driving means, and the number of film feed frames of the film cartridge. Checking means for checking the above, and detecting that the film cartridge is loaded in the camera, operating the driving means, and detecting that the leading means of the film has been reached by the checking means, Operate the reading means to start reading the information on the film. That information reading control means and the film information reading apparatus characterized by comprising a.