JPH10254037A - Data read-out device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the malfunction of a camera from occurring because a bar code is erroneously read even when a data disk is soiled or dust is attached to the data disk. SOLUTION: The data read-out device of the camera using a film having the data disk 25 which is integrally rotated with a film spool in a film cartridge and on which information related on the film is recorded by a pattern signal is provided with a driving means driving the rotation of the disk 25, signal detection means 7 and 8 detecting the pattern signal of the disk 25 and a time counting means measuring a time interval until the next pattern signal is detected after the pattern signal is detected by the detection means 7 and 8. When at least one inverting time interval among the inverting time intervals counted by the time counting means is out of a prescribed time range, it is judged to be the abnormal detection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reading bar code data of a camera using a film having a data disk on which information relating to the film is recorded in a bar code, rotating integrally with a film spool in a film cartridge. Things.

[0002]

2. Description of the Related Art A film having a data disk which rotates integrally with a film spool in a film cartridge and in which information about the film is recorded in a bar code is disclosed in JP-A-6-214301 and JP-A-7-64167.
And Japanese Patent Application Laid-Open No. 7-120827. This film has the following features.

When a cartridge is handled as a single unit, the film is always completely contained in the cartridge, and the leading end (bello) of the film is not exposed.

A variety of information about the film, such as the number of frames, is recorded as a bar code, and a data disk is provided for indicating unexposed, partially exposed, exposed, developed, and the like of the film.

[0005] The number and position of perforations are defined for the photographic frames.

At the entrance of the film, a light shielding door (hereinafter referred to as a light lock door or an LL door) for preventing exposure of the film is provided.

[0007] In this specification, a film cartridge having no film tip (bellow) is referred to as a "velvetless film cartridge".

In the above-mentioned film, data is read from a bar code and various controls of the camera are executed. To read data from a barcode, the data disc is rotated at a constant speed when the above-mentioned film is loaded into the camera, the time between barcode signal inversions is read by a sensor or the like, and the barcode is read from the read time. It has been conventionally proposed to decode data by detecting the width of each bit of a code.

[0009]

In the above-described cartridge, the data disk is exposed on the surface of the cartridge, and the user of the camera accidentally touches the data disk when loading the cartridge into the camera. The data disk may be dirty. In addition, since the data disk is exposed on the surface of the cartridge, it is sufficiently conceivable that a phenomenon such as attachment of dust or the like to the data disk occurs. When loading such a cartridge into the camera and reading the data disc signal, there is room for improvement in that there is a risk of misrecognizing and reading dirt or dust as a barcode signal and decoding the barcode signal incorrectly. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to prevent a camera from malfunctioning due to erroneous reading of a bar code even when a data disk becomes dirty or dusty. I do.

[0011]

In order to achieve this object, a camera data reading device according to the present invention rotates integrally with a film spool in a film cartridge, and information about the film is recorded by a pattern signal. In a data reading device for a camera using a film having a data disk (25), a driving means for driving the data disk to rotate, a signal detecting means (7, 8) for detecting a pattern signal of the data disk, and Time measuring means for measuring an interval time from detection of a signal to detection of the next pattern signal (steps S500 to S500)
S514), and when at least one of the plurality of intervals measured by the timer is out of the predetermined time range, it is determined that the detection is abnormal.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a camera data reading device according to the present invention.

In FIG. 1, a CPU 1 is a one-chip microcomputer which executes control programs shown in FIGS. 2 to 9 to control film loading and perform various calculations. The CPU 1 includes a cartridge lid switch 2, a release switch 3, an LL door open position switch 4, a thrust position detection switch 5, an exposed position detection switch 6, a sensor 7, a sensor 8, a motor drive circuit 9,
The cartridge detection switch 11 is connected.

The cartridge lid switch 2 closes when the lid of the cartridge chamber is opened, and opens when the lid is closed. The release switch 3 closes when a release button (not shown) is pressed, and controls a photometry circuit, a distance measurement circuit, or a shutter drive circuit (not shown) to perform a series of photographing operations.

The LL door open position switch 4 is connected to an L (not shown).
It is provided in the L door opening and closing mechanism. LL door opening and closing mechanism is LL
When the door is driven to the open position, the LL door open position switch 4 is closed.

The thrust position detection switch 5 and the exposed position detection switch 6 are provided in a film spool drive mechanism (not shown). When the film spool drive mechanism reaches a position where the film can be thrust (processing for feeding the first frame of the film to the photographing position), the thrust position detection switch 5 is closed. When the film spool drive mechanism drives the data disk to the exposed position, the exposed position detection switch 6 is closed. The thrust position detection switch 5 is linked to a mechanism for switching between an LL door opening / closing mechanism and a film spool driving mechanism.

The cartridge detecting switch 11 is a switch inside the cartridge loading mechanism of the camera, and is closed when the cartridge is loaded and the cartridge lid is closed.

The sensor 7 and the sensor 8 are photoreflectors having a light emitting and receiving device for optically detecting the data disk of the cartridge. As shown in FIG. 11, they are arranged at positions facing the data disk 25 of the cartridge. You. The white portion of the barcode has a high reflectance, and more light is reflected and enters the light receiver. The outputs of the sensors 7 and 8 are analog voltages, and the output voltage increases as the amount of received light increases.

The motor drive circuit 9 (FIG. 1) performs normal rotation, reverse rotation, and short-circuit of the motor 10 in accordance with a drive command from the CPU 1. The rotation of the motor 10 is performed via an LL door opening / closing mechanism or a film spool driving mechanism (not shown).
It is transmitted to the LL door or film spool of the cartridge. The torque transmitted to the LL door of the cartridge opens and closes the LL door of the cartridge. The torque transmitted to the film spool winds or rewinds the film and rotates the data disk 25 integrally formed with the film spool.

Whether the rotation of the motor 10 drives the LL door opening / closing mechanism or the film spool driving mechanism is switched depending on the rotation direction of the motor 10. It does not drive both mechanisms at the same time. When the rotation direction of the motor 10 is reverse, the film spool drive mechanism is driven. The reverse rotation drives the film in the rewind direction and rotates the data disk 25. When the motor 10 is switched from reverse rotation to normal rotation while the thrust position detection switch 5 is closed, the motor 10 drives the film spool drive mechanism. The forward rotation drives the film in the winding direction and rotates the data disk 25.
When the motor 10 is switched from reverse rotation to normal rotation while the thrust position detection switch 5 is not closed, the LL door opening / closing mechanism is driven. The LL door is opened and closed by the forward rotation. When the normal rotation is continued, the LL door repeatedly opens and closes.

In this embodiment, the velvetless film cartridge described in the section of the prior art is used. As shown in FIG. 12, this film cartridge is provided with a data disk 25 on which information about the film such as the total number of frames of the film is recorded, and an LL door 26 which is opened and closed as necessary to shield the exit of the film from light. ing. Various data relating to the film, such as the total number of frames of the film, are recorded in black and white barcodes on the data disk 25.
By rotating the data disk 25, the sensors 7 and 8
And reads the inversion interval time of the output signal, and decodes the data. The stop position of the data disk 25 is determined by the use state of the film, and is set to a stop position according to the use state such as unexposed, partially exposed, exposed, developed, and the like. Therefore, the state of the film can be detected based on the output signals of the sensors 7 and 8 when the data disc 25 is first rotated by loading the film cartridge into the camera. Further, the stop position of the data disk 25 can be visually recognized by a member that rotates integrally with the data disk 25 and the spool, and the state of the film can be known.

As shown in FIG.
Is composed of a data zone in which data is recorded by a barcode, and a rest zone in which no data is recorded. Further, the rest zone includes a black zone in which the barcode is black and a white zone in which the barcode is white. The data zone is configured with white codes and black codes alternately. When the data indicates bit "1", the code width is wide, and when the data indicates bit "0", the code width is narrow. In the present embodiment, the narrow cord is 5 ° and the wide cord is 15 °. Although the angles of all data zones vary depending on the recorded data, the black zone is set at 75 ° regardless of the recorded data. The angle of the white zone changes depending on the angle difference between the data zones.

Next, the operation of the embodiment will be described with reference to FIGS.

It is assumed that the battery has already been inserted and the CPU 1 has started executing the main program shown in FIG. In step S201, when the cartridge cover switch 2 is detected, the process waits until the cartridge cover is closed. When the cartridge lid is closed, the cartridge detection switch 11 is read in step S202. If a cartridge has not been loaded, the process proceeds to step S212, and the process ends. Thereafter, the process returns to step S200, and waits until the cartridge lid is closed again.

If it is detected in step S202 that a cartridge is loaded, the LL door is opened by executing the LL door opening process shown in FIG. 3 in step S203. The LL door opening process will be described later. In the subsequent step S204, the exposure state determination processing of FIG. The exposure state determination processing will be described later. In step S205, it is determined from the result of the exposure state determination processing whether or not the exposure has not been performed. If it is not the last exposure, the process proceeds to step S211 to execute the exposed position stop process of FIG. 7 to stop the data disk 25 at the exposed position. The exposed position stop processing will be described later. If it is the last exposure, the barcode reading process of FIG. 5 is executed in step S206. Then, step S207
The data discriminating process of FIG. 6 is executed. Step S208
Then, if the abnormal flag is set during the data discriminating process, the exposed position stopping process of FIG. 8 is executed in step S211 to stop at the exposed position. Thereafter, the process proceeds to step S212. In this case, since the processing is completed by stopping at the exposed position, the thrust of the film (the processing of feeding the first frame of the film to the photographing position) is not executed, and the processing is completed while the photographing is prohibited. Thereafter, an LL door closing process (not shown) is executed to close the LL door of the cartridge. The user of the camera then
Open the cartridge lid and remove the cartridge.

If the abnormality flag has not been set in step S208, a thrust position stop process shown in FIG. 7 is executed in step S209 to stop the data disk drive mechanism at the thrust position. The thrust position stop processing will be described later. Then, a thrust process is performed in step S210. The thrust process is a process of feeding the first frame of the film to the shooting position. The film is fed while detecting the position of the perforation of the film by a sensor (not shown), and the first frame reaches the shooting position. Thrust is completed by stopping the drive at times. Thus, the control for loading the film is completed.

Next, the LL door opening process will be described with reference to FIG.

The process starts from step S300. First, in step S301, normal rotation of the motor 10 is started. L
Since the drive mechanism at the start of the L door opening process has been switched to the LL door side, the forward rotation of the motor 10 in step S301 drives the LL door opening / closing mechanism to open and close the LL door.

Thereafter, in step S302, the door open position switch 4 is continuously read, and the control waits until the LL door is driven to the open position. If it is detected in step S302 that the LL door has been driven to the open position, then in step S303 the motor 10
To stop. Subsequently, in step S304, the motor 10 is reversely rotated for a predetermined time (here, 10 ms) to apply a reverse energization brake. In step S305, the motor 10 is short-circuited for a predetermined time (here, 100 ms) to apply a short brake. Thereby, the drive of the LL door is completely stopped, and the LL door is stopped at the open position. afterwards,
The process returns from step S306 to the original process.

Next, the exposure state determination processing will be described with reference to FIG.

The exposure state determination processing is performed on the data disk 2
This is a process for determining whether or not exposure has occurred by driving the counter 5 in a counterclockwise direction and counting edges input to the sensors 7 and 8. The stop position (angle) of the data disk 25 is determined according to the state of the film. When the data disk 25 is rotated in the counterclockwise direction, if the data disk 25 is not exposed, an edge is input to the sensor 7 first, and the data disk 25 is exposed. ,
If the exposure or processing has been completed, an edge is input to the sensor 8 first. Therefore, whether the image is unexposed or not is determined based on which of the sensors 7 and 8 receives the edge first. However, the actual stop position varies, and the boundary between the white zone and the black zone is recognized as an edge even in the pause zone.
Therefore, the data zone is recognized by continuously inputting a predetermined number of edges to the sensors 7 and 8. Here, assuming that the number of edges of the sensor 7 is 4 edges and the number of edges of the sensor 8 is 2 edges, the input of the fourth edge to the sensor 7 or the input of the second edge to the sensor 8 is the first. Judgment is made that if the fourth edge of the sensor 7 is inputted first, it is determined that the image is unexposed, and that the sensor 8
If an edge is input, it is determined to be other than unexposed. The flow of the process will be described according to the flowchart.

The process starts from step S400. First, in step S401, the read result flag (unexposed flag, exposed flag) is cleared. Then, step 4
At 02, the motor 10 is reversed. Then, step 403
Clears the edge number counter that counts the number of edges input to the sensors 7 and 8. After that, the process loops through steps 404 and S405.

In step 404, the input signal from the sensor 8 is read and compared with a threshold for signal level determination to determine H or L. In step 404, it is stored whether the determination result at the time of the previous reading of the sensor 8 is H or L, and it is determined whether the current determination result has changed from the previous determination result. If it has not changed,
It is determined that it has not been inverted, and the process proceeds to step 405. If it has changed, it is determined that it has been reversed, and the process proceeds to step 409. In step 409, 1 is added to the edge number counter of the sensor 8. In step 410, it is determined whether or not the edge number counter of the sensor 8 is 2, and if not, step 40 is executed.
Return to 4. If it is 2, it is determined that the film is not unexposed, and an exposed flag is set in step 411. Then, the process returns from step 412 to the original process.

At step 405, the input signal from the sensor 7 is read and compared with a signal level discriminating threshold value.
Determine H or L. In step 405, whether the determination result at the time of the previous reading of the sensor 8 is H or L is stored, and it is determined whether the current determination result has changed from the previous determination result. If it has not changed, it is determined that it has not been inverted, and the process returns to step 404. If it has changed, it is determined that it has been reversed, and the process proceeds to step 406. In step 406, 1 is added to the edge number counter of the sensor 7. Next, in step 407, it is determined whether or not the edge number counter of the sensor 7 is four.
Return to If it is 4, four edges are input to the sensor 7,
It is determined that an unexposed cartridge is loaded, and the flow advances to step 408 to set an unexposed flag. Then, the process returns from step 412 to the original process. Step 41
When returning from step 2 to the original processing, the motor 1
0 continues reversing. After the exposure state determination process is completed,
Thrust position stop processing in step 209 or step 21
The exposed position stop processing of 1 is executed, and the reverse rotation of the motor 10 is stopped during either processing.

Next, the bar code reading process will be described with reference to FIG.

In the bar code reading process, the starting point of the data zone detecting process is determined by detecting the black zone, and the transit time of the black zone is read to determine the reference time used when decoding the data. In addition,
It is assumed that one rotation time of the data disk may vary within a range of 450 ms to 600 ms depending on conditions such as a power supply voltage. In the barcode reading process, only the sensor 7 is used. In the following description, the edge detection is performed entirely by the sensor 7.

The process starts from step S500. The motor continues reverse rotation from the exposure state determination processing. In step S501, a clock timer for measuring an edge inversion interval time is started. Then, step S502
Wait for the edge to flip. When the edge is inverted, the timer stops at step S503. When the timer is stopped, the time measured by the timer is read in step S504. Since the clock timer starts the timer every time the edge is inverted, the time read here is the time indicating the edge inversion interval. In step S504, it is determined whether the edge interval time is 90 ms or more. When the sensor 8 is detecting the data zone, one rotation of the data disk 25 is the slowest at 600 ms because the edge is detected every 15 ° even if the edge interval is long.
, The edge is inverted every 25 ms. Also,
The black zone is always 75 ° and data disk 2
Even if one rotation of No. 5 is the fastest and is 450 ms, 93.
75 ms. Therefore, by determining whether or not the edge interval time is 90 ms or more in step S504, it can be determined whether or not the data zone is a data zone.

If the edge inversion interval time is not 90 ms or more in step S504, the sensor 8 has detected the data zone. In this case, the flow returns to step S501 to restart the clock timer and wait for the next edge inversion. If the edge inversion interval time is equal to or longer than 90 ms in step S504, it can be said that it is not a data zone. At this time, it is determined in step S505 whether or not the current inversion is a rising edge. 90ms edge reversal interval
The above is either a black zone or a white zone, and if the edge rises, it can be said that it is a black zone. If it is not the black zone, the process returns to step S501, starts the clock timer again, and waits for the next edge inversion. If it is the black zone, the edge inversion interval time (that is, the black zone passage time) is stored in the RAM in step S506. With the above processing, the detection of the black zone and the storage of the passing time of the black zone are completed. In subsequent processing,
The edge inversion interval time of the data zone is measured and stored.

While the reverse rotation of the motor continues, step S
At 507, the edge number counter is cleared to zero. afterwards,
In step S508, a timer is started. In step S509, the process waits for the edge to be inverted. When the edge is inverted, the timer stops in step S510. Next, in step S511, the count number of the edge number counter and the value of the clock timer (that is, the edge inversion interval time)
Is stored in the RAM. Thereafter, in step S512, the edge number counter is added. In step S513, the edge number counter is read, and it is determined whether or not the last edge of the data zone has been reached. In this embodiment, as can be seen from FIG. 10, since the data zone has 17 edges, the processing is repeated until the edge number counter reaches 17. Step S51
If it is detected in step 3 that the edge number counter has reached 17, the process returns from step S514 to the original process. By the processing of FIG. 5, the detection of the passage time of the black zone and the passage time of each data of the data zone is completed.

Next, the data determination processing will be described with reference to FIG.

The data discriminating process is executed following the bar code reading process shown in FIG. From the time data read in the processing of FIG. 5, the data in which the data zone is written is decoded into bit data “0” and “1”. Also,
It is determined whether or not the time data is an abnormal value. If the abnormal value is even one bit, it is determined that there is an abnormality such as contamination of the data disk 25.

The process starts from step S600. In step S601, a data disk movement time per 1 ° is obtained from the black zone passage time. Since the black zone is 75 °, the transit time of the black zone / 75 ° = data disk movement time per 1 °. Next, in step S602, a bit 0/1 determination time is calculated. Bit width is 5 ° for “0” and 1 for “1”
Since it is 5 °, the moving time of 10 °, which is the average value of 5 ° and 15 °, is set as the determination time. Data disk movement time per 1 ° × 10 = 0/1 discrimination time. Next, step S603 and step S604
Then, the abnormal data determination times A and B are calculated. Considering a margin so as to include variations in rotation speed, the edge interval time is equal to or less than 2.5 ° which is half of 5 °, and the time equivalent to 30 ° which is twice 15 °. The above time is regarded as abnormal data. Therefore, the data disk movement time per degree × 2.5 = abnormal data determination time A The data disk movement time per degree × 30 = abnormal data determination time B If the variation in the rotation speed of the mechanism is smaller, a narrower range may be set.

Next, in step S605, the edge inversion interval time is compared with the discrimination time A, and all the data are determined as the discrimination time A.
Make sure it's over. If at least one data is shorter than the discrimination time A, it is determined that there is an abnormality, and an abnormality flag is set in step S609. Further, in step S606, the edge inversion interval time is compared with the discrimination time B, and it is confirmed that all the data are shorter than the discrimination time B. If at least one data is longer than the discrimination time B, it is determined to be abnormal, and step S60 is performed.
At step 9, an abnormal flag is set. If all the data are between the discrimination times A and B, it is determined that the bar code reading inversion interval time data is normal, and in step S607, 0 is determined.
/ 1 discrimination time is compared with each edge inversion interval time, and the edge inversion interval time is converted into a 0/1 bit data string. Then, in step S608, the 0/1 bit data string is converted into specific film information (for example, the number of film frames) based on a predetermined data conversion table (not shown).
After that, the process returns from step S610 to the original process.

Next, the thrust position stop processing will be described with reference to FIG.

In the thrust position stop processing, the film spool driving mechanism driven in the reverse rotation direction of the motor 10 in the data discrimination processing is stopped at the thrust possible position. As a result, when the motor 10 is normally rotated in the thrust processing immediately after that, the motor 10 drives the film spool drive mechanism in the normal rotation direction to start thrust of the film. The processing will be described using a flowchart.

The process starts from step S700. At this point, the motor 10 is being driven in the reverse direction. In step S701, the reading of the thrust position detection switch 5 is continued until the film spool driving mechanism reaches the thrust position. After confirming that the switch has reached the thrust position, the motor 10 is stopped in step S702.
Next, in step S703, the motor 10 is rotated forward for a predetermined time (here, 10 ms) to apply a reverse energization brake. Subsequently, in step S704, a short brake is applied by short-circuiting the motor 10 for a predetermined time (here, 100 ms). Then, step S70
Then, the process returns to 5 from step 5.

Next, the exposed position stopping process will be described with reference to FIG.

In the exposed position stopping process, the film spool drive mechanism driven in the reverse direction of the motor 10 in the data discriminating process is stopped at the position where the data disk 25 has been exposed. The processing will be described with reference to a flowchart.

The process starts from step S800. At this point, the motor 10 is being driven in the reverse direction. In step S801, the exposure position detection switch 6 is continuously read until the film spool drive mechanism reaches the exposure position.
After confirming that the switch 6 has reached the exposed position, the motor 10 is stopped in step S802. Next, in step S705, the motor 10 is turned on for a predetermined time (here, 10
The reverse rotation brake is applied by rotating forward.
Subsequently, in step S706, the motor 10 is short-circuited for a predetermined time (here, 100 ms) to apply a short brake. Then, the process returns to the original process from step S805.

In the embodiment described above, the fact that a cartridge has been loaded is mechanically detected using the cartridge detection switch 11. However, the present invention is not limited to this, and no edge is input to the sensor in the bar code reading process. If no edge is input, the presence or absence of a cartridge may be detected by regarding that there is no cartridge.

In the embodiment, the constants related to the characteristics of the mechanical system such as the brake setting time have been described using specific numerical values. However, the present invention is not limited to these constants, and other values may be set. Absent. In addition, the present invention can be carried out other than the angle of each zone of the data disk 25, definition of data, definition of each zone, and the like other than those described in the present embodiment. Further, the abnormal data determination time is set in consideration of factors such as fluctuations in the rotational speed. However, if the causes of the variation in the mechanism are small, a more accurate abnormality determination process can be realized by further narrowing the range of the determination values.

Further, in the present embodiment, the reversal of the edge of the sensor 7 and the sensor 8 is determined by one determination. However, the same signal is removed by adopting the signal noise removal method which has been conventionally performed. The configuration may be such that signal noise is removed by adding a process of reading and reconfirming twice or more. FIG. 9 shows the double reading process. For example, step S5
02, the edge detection of the sensor 7 is determined. If step S502 is replaced with the flowchart of FIG. 9, the double reading process for chatter killer can be realized. The process proceeds from step S501. If it is not edge inversion in step S900, the process proceeds to step S900. In step S900, the sensor 7
If the edge inversion has been detected, it is 1 m in step S901.
s, and after 1 ms, in step S902, the sensor 7
Is checked, and if the sensor 7 is inverted, step S
Go to 503. If the sensor 7 has not detected reversal in step S902, the process returns to step S502.
The same applies to the edge detection of the sensors 7 and 8 at other timings. The same applies to reading of other switches.

Further, the power of the photoreflectors of the sensors 7 and 8 only needs to be turned on while the data disk 25 is being read. Although the power on / off timing is not particularly specified in the present embodiment, the present invention is not limited by this.

The data disk 25 is described as being recorded with an optical pattern signal. However, the data disk 25 is a data disk on which pattern signals such as a conductive pattern, a magnetic pattern, and mechanical irregularities are recorded. Is also good.
The sensors 7 and 8 are changed in accordance with each pattern signal to be read.

[0056]

As described above, according to the camera data readout apparatus of the present invention, when at least one of the inversion interval times out of the inversion interval times measured by the timing means is out of the predetermined time range, , It is possible to prevent malfunction due to erroneous reading even if the data disk is dirty or dusty.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a camera data reading device according to the present invention.

FIG. 2 is a flowchart showing an embodiment of a camera data reading device according to the present invention.

FIG. 3 is a flowchart showing an embodiment of a data reading device for a camera according to the present invention.

FIG. 4 is a flowchart showing an embodiment of a camera data reading device according to the present invention.

FIG. 5 is a flowchart showing an embodiment of a camera data reading device according to the present invention.

FIG. 6 is a flowchart showing an embodiment of a camera data reading device according to the present invention.

FIG. 7 is a flowchart illustrating an embodiment of a camera data reading device according to the present invention.

FIG. 8 is a flowchart illustrating an embodiment of a camera data reading device according to the present invention.

FIG. 9 is a flowchart showing a modification of the camera data reading device according to the present invention.

FIG. 10 is a front view showing an example of a data reading device of the camera.

FIG. 11 is a perspective view showing an example of a data reading device of the camera.

FIG. 12 is a perspective view illustrating an example of a data reading device of the camera.

[Explanation of symbols]

 Reference Signs List 1 CPU 2 Cartridge lid switch 3 Release switch 4 LL door open position switch 5 Thrust position detection switch 6 Exposed position detection switch 7 Sensor 8 Sensor 9 Motor drive circuit 10 Motor 11 Cartridge detection switch 25 Data disk 26 LL door

Claims (4)

[Claims] 1. A data reading apparatus for a camera using a film having a data disk on which information about the film is recorded by a pattern signal while rotating integrally with a film spool in a film cartridge. Means, a signal detection means for detecting a pattern signal of the data disk, and a timing means for measuring an interval time from the detection of the pattern signal by the signal detection means to the detection of the next pattern signal, When at least one of the plurality of intervals measured by the timer is out of a predetermined time range, it is determined that the detection is abnormal. 2. The data reading device according to claim 1, wherein the pattern signal is a bar code. 3. The apparatus according to claim 1, wherein said signal detecting means is a photo sensor. 4. The signal detecting means further comprises an inversion detecting means for detecting an inversion of the detection signal, and the clocking means detects the inversion of the signal after the inversion detecting means detects the inversion of the signal. 2. The data reading device for a camera according to claim 1, wherein an interval time until the measurement is performed is measured.