JPH117055A - Data read-out device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make operability excellent and to make the fact that a user feels unpleasant or a shutter chance missed extremely little by executing processing for removing the cause of erroneous reading, when it is decided that the erroneous reading occurs, at the time of reading a data disk, in a data read-out device. SOLUTION: When it is decided that the reading of data is in error (YES in #5), the operation of changing a relative position causing a speed fluctuation based on the load fluctuation of the data disk (#7-#10) is executed and after that, the data is reread (#11). The data is reread after the relative position causing the speed fluctuation which is considered as the cause of the erroneous reading is changed and there is a high possibility of normal reading.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data reading device for reading a data disk provided on a film cartridge.

[0002]

2. Description of the Related Art Conventionally, in a camera using a film cartridge having a data disk in which information about a film is recorded by a bar code or the like, when the film cartridge is loaded into the camera, the data disk is read by a sensor provided in the camera. In some cases, the state of the film, such as exposure or non-exposure, is determined based on the reading and the sensor output, and the subsequent camera operation is controlled in accordance with the state. In this type of data reading device, when the read data is out of a prescribed pattern, it is determined that the reading is erroneous, and a user is warned to that effect. In some cases, reading is continuously performed a plurality of times. A cause of this type of erroneous reading is a speed fluctuation based on a load fluctuation generated when the data disk is rotationally driven for reading. Although this load variation will be described later in detail, it is mainly caused by a load variation factor (for example, unevenness due to a light-shielding door portion) received by the film tip on the inner wall of the cartridge where the tip of the film slides when the data disk is rotationally driven.
This is because the barcode width is erroneously read due to the speed fluctuation.

[0003]

However, in the conventional data reading apparatus as described above, the apparatus itself does not actively perform the processing for removing the cause of the erroneous reading as described above, but merely issues a warning. Is not only inconvenient to use, but also uncomfortable to the user (the user does not know whether the device is broken or the film is defective) or misses a photo opportunity Becomes In addition, erroneous detection may occur even when reading is performed a plurality of times continuously. The present invention has been made in order to solve the above-described problems, and when a result of reading a data disc is determined to be an erroneous read, processing for removing the cause of the erroneous read is actively performed. Accordingly, it is an object of the present invention to provide a data reading device that can improve usability, reduce discomfort to a user, and reduce missed shutter chances.

[0004]

According to a first aspect of the present invention, there is provided a data reading apparatus for reading a data disk provided in a film cartridge, wherein the data disk is driven to rotate. A data reading means for reading data formed on the data disk, an erroneous reading determination means for determining an erroneous reading when the data read by the data reading means is out of a prescribed one, and A relative position changing means for changing a relative position with respect to the data disk, at which a speed change is generated based on a load change generated when the data disk is rotationally driven for reading, and after operation by the relative position changing means is performed. ,
Re-reading means for performing a data reading operation by the data reading means again.

In this configuration, when the erroneous reading determining means determines that the data reading is erroneous reading, the relative position changing means changes the relative position at which the speed fluctuation occurs based on the load fluctuation of the data disk. After the operation, the data reading operation is performed again by the data reading means. Since the re-reading is performed after changing the relative position where the speed fluctuation is considered to be a cause of the erroneous reading, the possibility of normal reading is increased.

According to a second aspect of the present invention, in the configuration according to the first aspect, the relative position changing means temporarily makes a drive system for rotating and driving the data disk free. In this configuration, since the drive system of the data disk is temporarily set free, the relative position of the data disk where the speed fluctuation is considered to be the cause of erroneous reading is changed, and it is possible to read normally after re-reading The nature becomes high. According to a third aspect of the present invention, in the configuration according to the first aspect, the relative position changing means temporarily reversely rotates the data disk. Also in this configuration, an operation equivalent to the above can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a data reading device of the present invention is applied to a camera will be described below with reference to the drawings. First, with reference to FIG. 1 to FIG. 5, a description will be given of a main part configuration of a film cartridge having a data disk and a camera loaded with the cartridge. The film cartridge 20 stores a film 26 wound around a spool shaft 24 in a cartridge case 22. In the camera 10, the lid 18 provided on the bottom surface is opened, and the film cartridge 20 is stored in the film cartridge chamber 16 therein (FIG. 3). An engagement groove 23 is formed on the upper shaft of the spool shaft 24. When the film cartridge 20 is loaded in the camera 10, the engagement groove 23 engages with the spool drive shaft 13 provided in the camera 10. . Spool drive shaft 13
Is driven by a motor output via a drive transmission mechanism (described later).

In the cartridge case 22 of the film cartridge 20, a data disk 30 (also simply referred to as a disk) on which a barcode is formed is fixed to the upper end of the spool shaft 24, and the barcode is radially formed on the upper surface 30a. Is formed. At the lower end of the spool shaft 24,
A film state display panel 50 (referred to as a display panel), which is a substantially fan-shaped reflector, is fixed at a predetermined angular position. The disc 30 and the display plate 50 rotate integrally with the spool shaft 24 in the cartridge case 22. A part of the upper surface 30a of the disc 30 is
Through the display windows 22a and 22b formed in the upper wall 21a, the display can be seen from the outside (FIG. 4). The data disk 30 may have a configuration in which the entire disk is provided outside the case 22.

The bottom wall 2 of the film cartridge 20
1b, display windows (transparent holes) 52 to 55 are formed at four places, and the white surface of the display panel 50 can be seen through the display windows 52 to 55, thereby displaying the film state ( (Fig. 5). The film cartridge 20 is
The stop positions of the disc 30 and the display panel 50 are set to be different depending on whether the film is exposed or unexposed. Specifically, a circular unexposed display window 52 indicating that the film 26 is unused and can be taken.
A half-circular exposure display window 53 indicating that some frames 27 of the film 26 have been photographed, and an X-shaped exposed display window 54 indicating that all the frames 27 of the film 26 have been photographed. And a square processed display window 55 indicating that the development processing of the film 26 and the like have been performed, are formed concentrically at a predetermined interval. Each display window 52-5
Reference numeral 4 is white when the display plate 50 that rotates together with the spool shaft 24 is located, and black otherwise. The film 26 is in a state indicated by a white display window where the display plate 50 is located, and thereby the film state can be visually displayed.

In the upper part of the film cartridge chamber 16 of the camera 10, a loaded film cartridge 20 is mounted.
As a sensor for reading, the photoreflector 11 (data reading means: FIG.
11) is provided, and the upper surface 30a of the data disk 30 is provided.
The bar code recorded in the can be read. In the present embodiment, an example in which data is read by one sensor is described. However, the present invention is not limited to this.
The present invention can be adopted as appropriate even when using more than one sensor. Further, a perforation 28 is formed on the upper part of the film 26, and a magnetic recording part 29 is formed on the lower part (FIG. 2). One frame 27 is exposed corresponding to one set of perforations 28. A photoreflector (13 in FIG. 6) provided at a position having a predetermined relationship with the exposure frame of the camera 10 detects a perforation 28 at the time of frame advance of the film 26, and the stop position of the frame 27 is determined by this detection signal. You. A magnetic material is applied to the magnetic recording unit 29, and recording / reproduction of data relating to photographing is performed by a magnetic recording / reproducing magnetic head (66 in FIG. 6) provided in the camera 10.

The camera 10 includes a film cartridge 20
The rotation of the spool drive shaft 13 is controlled so that the spool shaft 24 stops at a predetermined position (angle) in accordance with the film state of the camera. Is displayed. In addition, the film cartridge 2
The light-out door (light lock door: L
LD) is provided, and when the film cartridge 20 is loaded into the camera, the camera 1
The 0 drive shaft 25 is engaged, and the light shielding door is opened.

Next, an electric circuit configuration of the camera 10 according to the present embodiment will be described with reference to FIG. The microcomputer 60 has a built-in CPU which constitutes a means for controlling the entire camera, a sensor output detecting means, an identification counting means, a means for judging a film state, and the like, and an EEPROM 70 (electrically erasable PROM) which is a storage means. Elec
trically erasable and programmable read only memor
y) and the calendar circuit 71 are connected. EEP
The ROM 70 is a rewritable storage unit that is used for recording a film determination state and that does not lose its record even when the power is turned off. From the calendar circuit 71, the year, month,
Day, minute, second, and day of the week data can be understood.
The microcomputer 60 further includes a power supply 68,
Display device 62, photometric circuit 63, exposure control circuit 64
, An auto-focus control circuit 65, a magnetic circuit and a magnetic head 66, a motor 67 for driving various members, and various operation switches (SW) 61. Motor 6
The output to 7 is transmitted to a drive transmission mechanism 69 including a gear train, and drives various members.

A display device 62 displays the type of film 26, sensitivity, the number of shot frames, the number of remaining frames, an alarm, a result of discriminating the film state, and the like. The photometric circuit 63 detects the brightness of the subject. The exposure control circuit 64 controls a shutter speed and an aperture value based on film sensitivity and subject brightness. The auto focus control circuit 65 focuses on the subject. The magnetic circuit and the magnetic head 66 write data in the magnetic recording section 29 of the film 26. There are four switches 61, a release switch SW1, a cartridge presence / absence switch SW2 that opens and closes depending on whether or not the film cartridge 20 is loaded, an open / close switch SW3 that operates in conjunction with opening and closing of the lid 18, and a midway rewind switch SW4. There is. The motor 67 drives the film 26 such as winding and rewinding. Power supply 68 supplies power to the electrical circuit.

The microcomputer 60 has L
Through the ED control circuit and the detection circuit, the barcode reading photoreflector 11 (PR1), the perforation detection photoreflector 13 (PR3), and the motor rotation amount detection photoreflector 14 (PR4)
Each is connected.

FIG. 7 is a diagram showing a schematic configuration of the drive transmission mechanism 69. The motor 67 is driven by a gear 74, a cam 75
Are transmitted via a clutch or the like. A cam lever 76 is engaged with the cam 75, and the rotational position of the lever 77 that supports the planetary gear 79 is controlled in accordance with the posture of the cam lever 76. The drive transmitted to the gear 74 is transmitted to the planet gear 79 via the gear 78. The planetary gear 79 is coupled to and disengaged from any of the gear 81 for driving the shaft 25 of the light shielding door, the film rewinding gear 82, and the film thrusting gear 83, and selectively drives them. The drive by the film rewind gear 82 and the film thrust gear 83 is transmitted to the spool drive shaft 13. Reading of the data disk 30 is performed by driving the spool drive shaft 13 in the film rewind direction.

Next, referring to FIG.
The operation when the spool shaft 24 of the film cartridge 20 is driven in the film rewinding direction to read the image will be described. FIG. 8A is an end view of the film cartridge 20, and FIG. 8B is a view showing an engagement portion between the spool shaft 24 and the spool drive shaft 13. As shown on the left and right sides of the white arrow, the drive is performed. Accordingly, their engagement state changes. As shown in the left side diagram, when the spool drive shaft 13 is rotating the spool shaft 24 in the rewinding direction (arrow A), the leading end of the film 26 rubs against the inner wall of the film cartridge 20 and an appropriate load is applied. ing. From this state, as shown in the right figure, the load is reduced at the moment when the leading end of the film 26 is separated from the light shielding door 25 ', and only the spool shaft 24 is earlier than the spool drive shaft 13 due to the stored energy. It turns (arrow B).
Therefore, at that moment, the signal width read by the photoreflector 11 that reads the data disk 30 integrated with the spool shaft 24 is detected to be narrower than usual.

FIG. 9 is a diagram showing an erroneous reading occurrence sequence at the time of reading a data disk. [1] shows a case where erroneous reading occurs due to the above-mentioned operation, and [2] shows a case where it does not occur. Whether or not erroneous reading occurs depends on the timing at which the speed fluctuation based on the load fluctuation occurs,
That is, it changes according to the barcode position (phase) of the data disk 30. Here, information about the film is recorded by the width pattern of the black and white bars of the bar code, and the read signal is turned on by the white bar and turned off by the black bar (Q zone is a non-display area consisting of continuous black bars). .
As shown in FIG. 9A, when a speed fluctuation occurs immediately after entering a wide white bar, a reading that should originally be performed as “correct” is indicated as “wrong”. (A wide white bar is read as a narrow white bar). On the other hand, as shown in FIG. 9 [2], if a speed fluctuation occurs at the timing near the end of the wide white bar, no erroneous reading will occur.

According to the present invention, at the time of the above-described erroneous detection, the relative position at which the speed fluctuation is caused by the load fluctuation is changed, so that the cause of the malfunction is positively canceled.
The reading operation is performed again. FIG. 10 is a flowchart of the photographing data (film information) reading operation. When the film cartridge 20 is loaded into the camera 10, the microcomputer 60 operates the light shielding door (L).
LD) is opened (# 1), and bar code reading is performed to prevent double exposure (Opt-DEP; Double Exposure Prevent)
Is performed (# 2). In the film cartridge 20, the stop position of the data disk 30 is determined according to the exposure state of the film. Therefore, by reading the position of the barcode pattern when the film cartridge 20 is loaded into the camera 10, it is determined whether or not the exposure has been completed. Determine. This reading is performed by rotating the data disk 30 and counting signal pulses from the photoreflector 11 (data reading means) at that time. If it has been exposed, it operates so as not to be double-exposed. That is,
When it is determined that the film is unusable, VEI (Visual
Exposure Ingicator) is set (# 12).

If it is determined in step # 3 that the film is usable, a photographing data determination process is performed (# 4). This determination processing is performed by rotating the data disk 30, reading the signal pulse at that time, and determining whether or not the pattern is a predetermined pattern, as described above (erroneous reading determination means). The film cartridge 20 at this time
The movement of the spool shaft 24 is as shown in FIG. As a result, when the read pattern is not an impossible one, that is, when the read pattern is a specified pattern, (#
If NO in step 5), the film is determined to be normal, and the film is thrust (initial loaded) (# 13). If the read pattern is impossible (YES in # 5), it is determined that an erroneous read has occurred, and the process proceeds to # 6 and subsequent steps. In # 6, it is checked whether the number of times of the discrimination processing in # 4 has exceeded a predetermined number, and if the number has exceeded the predetermined number (YES in # 6), exception processing (error processing) is performed (# 14). If the number does not exceed the predetermined number (NO in # 6), in steps # 7 to # 11, the operation of changing the relative position where the speed fluctuation based on the load fluctuation generated when the data disk 30 is rotationally driven for reading is changed. Is performed (relative position changing means), and then the data reading operation is performed again (re-read executing means).

Specifically, the drive transmission mechanism 6 shown in FIG.
9 by controlling the movement of the cam lever 76 and the like.
(Referred to as a drive gear) is released from the film rewind gear 82 to make the drive system free (# 7) and wait for a predetermined time (# 8). Thus, the stop position of the leading end of the film in the film cartridge 20 changes as the film is loosened. Thereafter, the drive gear is re-coupled (# 9), and the drive of the drive gear is started (# 10).
The barcode is read again (# 11), and the process returns to # 4.
By performing such processing, when the first barcode reading is an erroneous reading, the cause of the erroneous reading can be positively removed by changing the relative position where the speed fluctuation occurs, and the second reading can be performed again. In reading, there is a high possibility that accurate reading can be performed.

FIG. 11 is a flowchart showing another example of the photographing data reading operation. The method of changing the relative position at which the speed fluctuation based on the load fluctuation at the time of reading the data disk 30 is different from the above-mentioned method is performed by switching control of the rotation direction of the motor 67 without releasing the driving gear. That is, instead of # 7, the motor 6 is driven in the thrust direction (in the film feeding direction and opposite to the rewinding direction) in # 17, and in place of # 9 and # 10, the motor 6 is driven in # 20. Is driven in the rewind direction. With such an operation, the relative position where the speed fluctuation of the data disk 30 occurs can be changed.

Next, the double exposure prevention (Opt-DE
An erroneous pulse generation sequence in the determination process for P) will be described with reference to FIG. FIG. 12A shows a case where the output of the data disk 30 is halfway. When the first pulse at the start of rotation in the first lap is halfway, the height of the first pulse in the first lap and the second lap is high. If the difference between the level (* 1 and * 2) or the OFF level (* 1 and * 2) is large, it is determined that the pulse is erroneous. (B) shows a case where the difference between the barcode widths is large, and the pulse widths corresponding to the first and second laps (☆
If the difference between 1 and 2) is large, it is determined that the pulse is erroneous. Thus, if the output difference between the first and second laps is large, 1
The lap is determined to be an erroneous detection. (C) is a case where the winding is loosened. If the pulse P1 is erroneously generated due to the loosening when the first LLD is opened, the erroneous pulse P1 'is generated due to the pulse P1 in the Opt-DEP process.

The operation in the determination process for the Opt-DEP will be described with reference to the timing chart of FIG. FIG. 13A is a development view of a bar code (having a fixed positional relationship with the film state display) of the data disk 30 and a timing chart of a bar code reading waveform.
(B) Non-display area (Q zone) according to film condition
Shows the number of PR1 pulses (the number of changes) up to. Since the positions of the data disk 30 and the photoreflector 11 vary, the initial position of the data disk 30 in each film state has a width. For this reason, the number of edge changes from the start of rotation of the data disk 30 to the detection of the end of the non-display area until the end of the non-display area is detected is normally 9 to 12 in the case of the unexposed state. In the case of a state other than the unexposed state (during exposure, exposed, processed), the number is 1 to 2, or 14. Here, the data disk 30 is rotated in the direction of rewinding the film 26 into the cartridge 20 until the non-display area passes through the photo reflector 11. The photoreflector 11 sequentially detects a reversal part (edge) from white to black or black to white,
The process is performed until a non-display area can be detected, and the film state is determined based on the number of changes in PR1 obtained thereby.

Next, the determination processing operation for the above Opt-DEP will be described with reference to the flowchart of FIG.
First, it is checked whether the number of white / black changes (output of the photoreflector 11) until the end of the non-display area (Q zone) of the barcode is 8 times or less (# 21). Is already exposed including partial exposure (# 27).
If it is 9 or more (NO in # 21), it is checked whether the number of white / black changes up to the end of the Q zone is 14 (# 2).
2). At this time, as described above, when the number of changes is 9 to 12, the image is unexposed, and when the number of changes is 1, 2 or 14, it is unconditionally determined to be other than unexposed (exposed including during exposure). If it is 14, the exposure is completed, and if it is not 14, the exposure is not performed (# 28).
Considering the possibility that an erroneous pulse is generated as shown in FIG.
Performing the determination as shown in FIG. 26 sequentially enables more accurate determination.

That is, it is checked whether the data on the data disk before the opening of the LLD is white (# 23). If the data is white, it is not exposed because it has not been exposed (# 28).
If it is not white in # 23, it is checked whether or not the data disk output of the first lap is halfway compared to that of the second lap (# 24). 28). If there is no halfway in # 24, LL
It is checked whether or not the winding of the film has occurred during the period from the opening of D to the Opt-DEP process (# 25). If the winding has occurred, the film is not exposed (# 28). If the winding looseness has not occurred in # 25, it is checked whether the difference between the widths of the corresponding barcodes in the first and second laps is maximal (# 26). # 28) If the difference is not maximal,
It is determined that exposure has been completed (# 27). By performing such a determination, it is possible to eliminate the inconvenience that the exposure is uniformly performed because a small erroneous pulse is generated although the exposure is not performed correctly.

It should be noted that the present invention is not limited to the configuration of the above embodiment, and various modifications are possible. For example, in the above-described embodiment, as a configuration for changing the relative position of the data disk in which the speed variation based on the load variation occurs, the configuration in which the drive gear is made free and the configuration in which the drive gear is temporarily moved in the reverse direction to the rewind direction for reading data are used. Although an example of driving is shown, an arbitrary configuration for positively canceling the cause of a malfunction can be adopted.

[0027]

As described above, according to the present invention, when it is determined that the data disk is erroneously read at the time of reading,
Re-reading is performed by changing the relative position where the speed fluctuation occurs due to the load fluctuation during the rotation drive of the data disk, so that the cause of erroneous reading can be positively removed, and usability is improved. Can be improved, and the occurrence of discomfort to the user and the loss of a photo opportunity can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a film cartridge used in a camera according to an embodiment of the present invention.

FIG. 2 is a plan view of a film of the film cartridge.

FIG. 3 is a sectional view of a main part of the camera.

FIG. 4 is a top view of the film cartridge.

FIG. 5 is a bottom view of the film cartridge.

FIG. 6 is an electric circuit configuration diagram of the camera.

FIG. 7 is a diagram showing a schematic configuration of a drive transmission mechanism.

FIG. 8A is an end view of a film cartridge.
(B) is a diagram showing an engagement portion between the spool shaft and the spool drive shaft.

FIG. 9 is a diagram showing an erroneous reading occurrence sequence when reading a data disk.

FIG. 10 is a flowchart of a photographing data reading operation.

FIG. 11 is a flowchart according to another example of the photographing data reading operation.

FIGS. 12A, 12B, and 12C are diagrams showing an erroneous pulse generation sequence in a discrimination process for preventing double exposure.

13A is a developed view of a barcode disk and a time chart of a sensor output waveform in an ideal case, and FIG. 13B is a diagram illustrating a relationship between a film state and the number of changes in the sensor output.

FIG. 14 is a flowchart of a determination processing operation for preventing double exposure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Camera 11 Photoreflector for barcode reading (data reading means) 20 Film cartridge 26 Film 30 Barcode disk 60 Microcomputer (misreading determination means, relative position changing means, rereading execution means) 67 Motor 69 Drive transmission mechanism

Claims (3)

[Claims] 1. A data reading device provided on a film cartridge for reading a data disk, comprising: a data reading means for rotating the data disk and reading data formed on the data disk at that time; An erroneous reading determination unit that determines erroneous reading when the data read by the reading unit deviates from a prescribed one; and when the erroneous reading is determined by the above, the data disk is rotated to read the data disk. A relative position changing means for changing a relative position at which a speed change based on a load change generated when driving is performed, and a data reading operation performed by the data reading means again after the operation by the relative position changing means is performed. Reading execution means. Data reader. 2. The data reading apparatus according to claim 1, wherein the relative position changing unit temporarily sets a drive system for rotatingly driving the data disk to free. 3. The data reading apparatus according to claim 1, wherein the relative position changing means temporarily reversely drives the rotation of the data disk.