JPH08286227A - Cartridge using state display set device - Google Patents

Abstract

PURPOSE: To stop a spool at a position where a prescribed using state notation is displayed based on a passing time in a prescribed section on a bar-code rotary disk which is integrally rotated with a spool for a film cartridge and a previously obtained angle ratio in the prescribed section. CONSTITUTION: A data disk 14 is rotated in a direction shown by an arrow X at a constant speed, A 1st period Tq as a passing time in a quiet zone 14a is measured by an optical sensor 40, next, the Ap /Aq of the rotating angle Aq of the quiet zone 14a to a rotating angle Ap from the starting end position of the quiet zone 14a up to the optical sensor position when 'exposed' is displayed is calculated, thereafter, a 2nd period Tp is calculated by the expression (Ap /Aq ×Tq ), and the spool 12 is stopped after the lapse of the 2nd period Tp after detecting the starting end position of the quiet zone 14a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge usage status display setting device arranged in a camera for setting the usage status display of a photographic film cartridge to a desired display. In a camera that uses a cartridge in which the bar code arrangement of the bar code rotary plate having the film information is positionalally related, the cartridge use status that reads the film information of the bar code rotary plate and sets the usage status display to the desired display The present invention relates to a display set device.

[0002]

2. Description of the Related Art Data peculiar to the film such as ISO sensitivity and the number of frames that can be photographed are written as a bar code on the surface of a disk-shaped data disk, and this data disk is rotated integrally with the spool with the spool as the center of rotation. A film cartridge configured to do so is known. The above-mentioned bar code is formed by arranging a bar which is a low reflection element and a space which is a high reflection element in the rotation direction of the data disc, and the data is provided between the start end and the end of the bar code. Is provided with a quiet zone indicating the start or end of reading.

A camera using a film cartridge provided with such a data disk is also known (for example, US Pat. No. 5,025,274). This camera is equipped with a photo sensor for reading a bar code in the portion facing the data disc in the state where the film cartridge is housed. After the film cartridge is housed in the camera, the film is initially fed (first frame set). ), The bar code of the data disk that rotates in conjunction with the spool is read by this photo sensor, and various settings such as the camera diaphragm are automatically set based on the read data. I have to.

By the way, in such a cartridge,
Since the film reader does not protrude from the cartridge except when photographing, even if the film cartridge is seen from the outside, it cannot be discriminated whether it is before use or after use.
Therefore, the inventors of the present application have determined whether the usage state of the film accommodated in the cartridge is “unused state”, “partially exposed state”, “all exposed state”, or “developed state”. In order to automatically identify and display this state as a pattern, a film use state display set device arranged in the camera has been developed and already disclosed (Patent application
6-101194). This film use state display setting device is provided with a pulse generator that generates a pulse in synchronization with the rotation of the feeding motor that rotates the spool shaft of the film cartridge. When the quiet zone of the bar code is detected by, the counting of the output pulse from the pulse generator is started at this detection timing, and the bar code rotary plate is moved at the position where this count value becomes a preset predetermined value. It is so arranged that it is stopped and a design of a predetermined use state display having a predetermined positional relationship with the bar code position of the bar code rotary plate is set at the display position.

On the other hand, in various types of cameras including the above-mentioned types of cameras, when it is determined that the film cannot be recovered due to an abnormality in the film feeding, it is possible to avoid the influence of the frames already taken. In order to perform the film rewinding operation, finally, using the above-mentioned film use state display set device, the bar code rotating plate (the spool of the cartridge) is stopped at the position where the symbol indicating the exposed state is displayed as the use state display of the cartridge. . As a result, even when the film stored in the cartridge is reloaded into the camera again, it is possible to prevent double shooting of the film frame that has already been taken, or accidental mistaking it as developed and pulling it out of the cartridge. You can

[0006]

However, the abnormality of the film feeding includes the abnormality of the means for detecting the rotation of the motor such as the pulse generator. In such an abnormality, the rotation detection pulse is normal. Since it is not detected on the bar code rotating plate (spool of cartridge) at the position where the exposed pattern is displayed as the usage status display
It will be difficult to reliably stop.

The present invention has been made in view of such circumstances, and displays a desired use state display even when a pulse for detecting rotation of a motor for rotating a spool of a film cartridge is not normally detected. It is an object of the present invention to provide a use state display set device capable of stopping the spool of a film cartridge at a possible rotation position.

[0008]

SUMMARY OF THE INVENTION A first cartridge usage status display set device according to the present invention comprises a bar code rotating plate having film information on one end surface thereof, and at a position where rotation of the bar code rotating plate is stopped. According to a cartridge use state display setting device of a camera having a cartridge chamber in which a photographic film cartridge capable of identifying the use state of the film is accommodated, and an optical sensor for reading the barcode is arranged in the cartridge chamber, Based on the film information read by the optical sensor, a first period, which is a period during which the optical sensor passes within a predetermined section of the bar code where the optical sensor is located in a state where a predetermined usage state is displayed, The optical sensor in the predetermined section calculated and calculated in the first period and the predetermined usage state is displayed. The optical sensor passes between the start position of the predetermined section and the stop position of the optical sensor in the predetermined section based on the position information (for example, information that can specify the position of the optical sensor like the following angle information). Period calculating means for calculating a second period predicted to be a period, and stopping the rotating plate when the second period elapses after the optical sensor has passed the start end position of the predetermined section. It is characterized in that a rotating plate stopping means is provided.

A second cartridge usage status display / setting device of the present invention is the first cartridge usage status display / setting device, wherein the predetermined usage status is displayed by the position information of the optical sensor. definitive when, the angle a _P between the stop position of the optical sensor and the starting end position, the angle of the predetermined section a _q, the first time period T _q
Then, the second period,

[0010]

[Equation 1]

It is characterized in that it is configured to calculate according to the following equation.

[0012]

According to the above structure, the first period, which is the time required for the optical sensor to pass through the predetermined section of the bar code, is calculated, and then the first period and the predetermined use state display are performed. Is the time from when the optical sensor passes the starting end position of the predetermined section to when the predetermined use state display is displayed, based on the position information of the optical sensor in the predetermined section when is displayed. Calculate the second period expected to be
Next, the bar code rotary plate (spool of the cartridge) is actually stopped at the timing when the second period has passed since the optical sensor passed the start position of the predetermined period. With this, a predetermined use state display can be displayed.

In general, it is conceivable to position the optical sensor by using a motor rotation pulse generated in synchronization with the rotation of the feeding motor, and thereby display the predetermined use state display. Abnormality may occur in the generation of the rotation pulse.

Normally, when a failure occurs in the camera,
Rewind the film into the cartridge as described above,
After this, it is desirable to set a display indicating the exposed state as the use state display so that it can be seen from the outside.However, in the case of a failure due to the abnormal occurrence of the motor rotation detection pulse, the use state display can be set to the exposed state. It gets harder.

In particular, when the photosensor is set in the quiet zone which is a wide element in the state where the display of the exposed state is made, it is extremely difficult to position the sensor in the exposed state.

According to the apparatus of the present invention, the first period which is the transit time of the quiet zone of the optical sensor is calculated,
Next, based on the calculated first period and the angular position of the optical sensor in the quiet zone when the exposed display is made, the optical sensor detects the start position of the quiet zone, and After calculating the second period predicted to be the time to reach the position of the optical sensor when the exposed state is displayed, and actually detecting the start position of the quiet zone, the calculated second period is calculated. Since the bar code rotary plate, that is, the spool of the cartridge is stopped at the timing when the period has elapsed, it is possible to reliably display the exposed display even when the generation of the motor rotation pulse becomes abnormal. .

Accordingly, it is possible to prevent an accident such as double photographing of the film frame which has been photographed, and accidental re-exposure of the film by mistakenly recognizing that the film has been developed. .

The apparatus of the present invention is premised on that the spool of the cartridge is rotated at a substantially constant speed when displaying the usage status display.

Further, as the positional information of the optical sensor necessary for calculating the second period, the angle A _q of the predetermined section of the bar code and the predetermined section when the predetermined use state is displayed are displayed. The ratio value A _p / A _q of the angle A _p from the starting end position of the optical sensor to the position where the photo sensor is disposed is used, and the ratio value A _p / A _q is the passing time of the photo sensor in the predetermined section. By multiplying by _q (first period), when the bar code rotary plate rotates at a constant speed, the optical sensor position in the predetermined section from the start end position when the predetermined use state display is displayed. Optical sensor transit time until (second
Period) T _p can be easily obtained.

That is, in the above specific example, the light sensor passage time in the quiet zone is T _q , the angle from the start position of the quiet zone to the light sensor position when the exposed state is displayed is A _p , and the quiet zone is in the quiet zone. If the angle is A _q and A _p / A _q × T _q is calculated, the second period from when the start end position of the quiet zone is detected to when the bar code rotary plate is stopped to display the exposed state. T _p can be easily obtained.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cartridge usage status display / setting device of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic perspective view showing a film cartridge which is loaded in the camera and whose information is read by the use state display setting device of this embodiment.

The illustrated film cartridge (hereinafter referred to as a cartridge) 10 includes a cartridge body 11, a spool 12 accommodated in the cartridge body 11, which is wound around a film 13, and a cartridge body 11.
And a shutter (not shown) for opening and closing an opening (not numbered) for taking in and out the film 13, and the spool 12 is rotatably held with respect to the cartridge body 11 when the shutter is in an open state. The structure is such that when the shutter is in the closed state, it is held at the rotational angle position and the inside of the cartridge body 11 is shielded from light. Further, a spool 12 of the cartridge 10 is integrally provided with a data disk (bar code rotating plate) 14 on which unique information such as ISO sensitivity of the film 13 and the number of frames that can be photographed is recorded by a bar code.
A window 11a for exposing the barcode of the data disk 14 to the outside is formed on the upper end surface of the cartridge body 11.

The disk-shaped upper surface 1 of the data disk 14
4q is formed in black (see FIG. 3), and a semi-ring-shaped bar code forming piece 14p in which black and white elements are alternately arranged is attached on the upper surface 14q of the disk. The zone 14a is formed by both the disk upper surface 14q and the bar code forming piece 14p.

Further, the letters "unused", "partially exposed", "exposed" and "developed" are printed on the upper end surface of the cartridge body 11 at predetermined angles, and The sagittal index 12a that rotates integrally indicates one of these, and the film cartridge 10
The user is informed of the state of use of the film 13 stored in. The spool 12 includes a spool drive shaft 3 of a camera 70 according to an embodiment of the present invention described later.
A key groove 12b that engages with the No. 4 key 34a is formed.

FIG. 3 is a plan view showing an example of the data disk 14, and the bar code is composed of a black non-reflective bar (shown by diagonal lines) and a white highly reflective space. The black non-reflective bar and the white highly reflective space are respectively used in two types, one having a narrow occupancy angle in the rotation direction (occupation angle δ = 8 °) and one having a wide occupancy angle (occupation angle δ = 20 °). Further, of the black non-reflective bars, the occupying angle δ in the circumferential direction is significantly larger than that of the other bars.
_q (A _q > 100 °) black quiet zone 1
4a is provided.

This black quiet zone 14a
Is a reference for the reading start end and reading end of the bar code, and is accommodated in the cartridge 10 between the space 14c adjacent to the black quiet zone 14a and the starting end position of the black quiet zone 14a in the clockwise direction. It is a data section that represents information such as ISO sensitivity and the number of frames that can be photographed regarding the film 13.

The data portion includes a wide bar 14x and a narrow bar 14x, and a wide space 14y and a narrow space 14y for separating these bars from each other.
It is composed of and, and the bars and spaces are arranged alternately. Here, a logical value is constituted by the width of the bar (occupation angle) and the width of the space (occupation angle), and desired information can be expressed as data by these arrangement patterns.

Here, the data disk 14 is the spool 12
And the index 12a indicating the use state display of the film also rotate integrally with the spool 12. Therefore, the data disk 14, the index 12a and the key groove 1
It has a relatively constant angular relationship with 2b. That is, as shown in FIG. 3, the index 12a is always located at the rear side in the rotational direction by a predetermined angle with respect to the rear edge (position Q) in the rotational direction of the black quiet zone 14a which is the reading start end of the barcode, and the key groove 12b is The black quiet zone 14a is always positioned forward by a predetermined angle with respect to the front edge (position Q ₀ ) in the rotational direction of the black quiet zone 14a, and the angular relationship with the black quiet zone 14a is uniquely determined.

FIG. 4 is a perspective view showing the outline of a camera equipped with a use state display setting device according to the first embodiment of the present invention. The illustrated camera 70 has a cartridge accommodating chamber for accommodating the film cartridge 10 and has a support shaft 7
The film cartridge 10 is taken in and out of the cartridge storage chamber by opening the back cover 73 that is rotatable in the direction of the arrow Y around the center 2. Further, a lid opening / closing switch 52 for detecting opening / closing of the back lid 73 is provided at a position where it abuts when the back lid 73 is closed and separates when the back lid 73 is opened. A cartridge presence / absence switch 51 for detecting whether or not the film cartridge 10 is accommodated in the cartridge accommodating chamber is provided on the inner wall surface of the cartridge accommodating chamber.

In the cartridge accommodating chamber, a spool drive shaft 34 for rotating the spool 12 of the accommodated film cartridge 10 is provided biased upward in the figure by a spring 34b, and the spool drive shaft 34 is driven. It is rotationally driven by the motor 30 via the force transmission portion 37 (see FIG. 7). A key 34a that engages with a key groove 12b formed on the spool 12 of the film cartridge 10 is formed on a part of the peripheral wall of the spool drive shaft 34, and the key groove 12b of the housed cartridge 10 is positioned in the rotational direction. And the rotational direction position of the key 34a do not match, the spool drive shaft 34 is pressed downward by the lower end surface of the spool 12 against the urging force of the spring 34b.
In this case, when the spool drive shaft 34 is rotationally driven by the motor 30, the key 34a also rotates, engages with the key groove 12b of the spool 12 within one rotation, and is projected upward by the urging force of the spring 34b. The spool drive shaft 34 is fitted and inserted.

After the spool drive shaft 34 and the spool 12 are engaged in this way, the spool drive shaft 34, the spool 12 and the data disk 14 rotate integrally, so the key 34a of the spool drive shaft 34 is black. The quiet zone 14a is always positioned forward in the rotational direction by a predetermined angle with respect to the rear edge (position Q) in the rotational direction.

A first photo sensor 40 for reading a bar code is provided on the inner surface of the back cover 73, and the cartridge 10 in which the used state of the film 13 is "unused" is stored in the cartridge storage chamber. When the sensor 40 faces the position rotated by a predetermined angle in the arrow X direction from the boundary position Q ₀ between the black quiet zone 14a and the space adjacent in the counterclockwise direction (arrow X direction; rotation direction), the indicator 12a is The "unused" shown on the cartridge body 11 is indicated. Further, when the photosensor 40 faces the position rotated by a predetermined angle in the clockwise direction, the index 12a indicates “partial exposure”, and when facing the position rotated further by the predetermined angle in the clockwise direction from this position, the index 12a. Indicates "exposed" and "developed" when facing a position rotated by a predetermined angle.

FIG. 5 shows the positional relationship between the data disk 14 and the optical sensor 40 in the "unexposed", "partially exposed", "exposed" and "developed" states.

Further, as shown in FIG. 6, the rotary shaft of the motor 30 is provided with an encoder 35 which is integrally rotated with the rotary shaft and has slits perforated at predetermined rotation angles. LED (light emitting diode) 36a that irradiates light toward the slit (see FIG. 7)
The second photo sensor 36 for detecting the LED light passing through the slit, and the pulse number of the pulse light detected by the second photo sensor 36 are counted, and based on the counted pulse number, The rotation angle of the data disk 14 is calculated until the photo sensor 40 of No. 1 detects the black quiet zone 14a, and the usage state of the film 13 when the film cartridge is accommodated is identified according to the calculated rotation angle of the data disk 14. The microcomputer 100 for performing the processing is provided. The microcomputer 100 is an RA that stores variables necessary for processing.
It has a built-in M and a ROM in which a program necessary for processing is written. FIG. 7 is a block diagram showing these electric circuits.

By the way, when an abnormality occurs in each part in the camera, the film 13 is rewound into the cartridge 10 according to an instruction from the microcomputer 100, and thereafter, the index 12a indicates the character "exposed". The spool 12 is rotated as described above.

However, the encoder 35 and the second
If something goes wrong with the photo sensor 36 of
A motor rotation pulse may not be reliably output from the second photo sensor 36, and in particular, it is set so as to indicate the character "exposed" when the optical sensor 40 is located in the wide quiet zone 14. If so, it becomes difficult to stop the rotation of the spool 12 at a predetermined position.

Therefore, in the above embodiment, when the microcomputer 100 determines that some abnormality has occurred in the encoder 35 or the second photo sensor 36, the timing for stopping the rotation of the spool 12 is set to the second timing.
It is not calculated by the count value based on the motor rotation pulse from the photo sensor 36 of FIG.
Is configured to stop the spool 12 after a lapse of a predetermined time from the detection of the start position of the quiet zone 14a, and in this state, the index 12a indicates the character "exposed".

This will be described in detail below with reference to FIGS. 1 and 8.

FIG. 8A shows a main routine (VEI par) of a program incorporated in the microcomputer 100 for the above-mentioned abnormality in the generation of the motor rotation pulse.
ing).

That is, in the microcomputer 100, it is determined at a predetermined timing whether or not the motor rotation pulse abnormality flag indicating that the motor rotation pulse is abnormal is set (S1).

If the flag is not set, the normal VEI
VEI that does not use the motor rotation pulse if the parking subroutine (S2) is executed and the flag is set
The parking subroutine is executed (S3).

VEI not using this motor rotation pulse
The parking subroutine is shown in the flowchart of FIG. In FIG. 1 referred to in the explanation of this subroutine, the position where the optical sensor 40 exists at a predetermined timing is indicated by a number. Further, the relative movement of the optical sensor position is shown by a spiral, but since it is the movement assuming that the data disk 14 is fixed, its traveling direction is the actual rotation direction X of the data disk 14. It is drawn to be the opposite.

The position where the optical sensor 40 is initially provided is shown as 0 in FIG.

In the following operation, the data disk 14 rotates at a constant speed in the arrow X direction.

Next, after passing through this initial position, first the bar 1
The rotational position (first transition position) that has moved from 4x to the space 14y is detected (S11).

Next, the time (1 rotation time T) until the data disk 14 rotates in the direction of arrow X and the optical sensor 40 returns to the first transition position () again.
_q ') is measured (S12). The data disk 14 has a bar (including the quiet zone 14a) 1 in the rotation direction.
Since there are seven pairs of 4x and space 14y, it is recognized that one rotation is made when the above transition is measured for the eighth time.

The reason why the first transition is measured in step 11 (S11) is to ensure the start position of the one-revolution time measurement. Further, the measured time required for the data disk 14 to make one revolution is stored in the memory.

Next, the time (first period) required for the optical sensor 40 to pass from the start position to the end position of the quiet zone 14a is measured (S13). With this measurement completed, the optical sensor 40 is arranged at the position in FIG. Transit time of the quiet zone 14a is stored as T _q in memory.

After that, the position where six pairs of the bar 14x and the space 14y have passed is detected from the position in FIG. 1, and the space 14y is further passed to advance to the start position of the quiet zone 14a (S14). .

Next, the rotation angle A _p (see FIG. 3) from the start position of the quiet zone 14a to the position where the optical sensor 40 is arranged in the "exposed" display state and the rotation angle A _q of the quiet zone 14a (FIG. 3). Value) A _p /
The second period T _p is calculated by multiplying A _q (stored in the memory in advance) by the transit time T _q of the quiet zone 14a measured one revolution before and stored in the memory. At the same time, the rotation accuracy A _p and the ratio value A _p / 360 (previously stored in the memory) of 360 ° which is the rotation angle for one rotation are calculated in step 12 (S12) and stored in the memory. Saved data disk 14
1 rotation time T _q ′ is calculated to calculate the third period T _p ′ (S15).

Next, whether the difference between the two periods T _p and T _p ′ calculated in step 15 (S15) is smaller than a predetermined allowable error t ₀ , that is, | T _p
-T _p ′ | <t ₀ is determined. As a result of this determination, if | T _p −T _p ′ | <t ₀ , it is determined that the calculation result is accurate, and the process proceeds to the next step, where | T _p −T
_{If p} ′ | ≧ t ₀ , it is determined that some abnormality has occurred, the process returns to step 11 (S11), and the above measurement and calculation are performed again.

When the condition of | T _p −T _p ′ | <t ₀ is satisfied, the rotation of the data disk 14 is stopped after the elapse of the second period T _p (S1).
5).

This stopped state (in this state, the optical sensor 4
0 is on the position), the index 12a attached to the spool 12 is designed to indicate the character "exposed".

In this way, even when the motor rotation pulse is not normally generated, the display of "exposed" can be surely performed, and the film frame already photographed is double photographed or developed. It is possible to prevent an unexpected situation in which the film is mistakenly recognized and the film is inadvertently taken out of the cartridge.

The cartridge usage status display setting device of the present invention is not limited to the above-mentioned embodiment, but various modifications can be made, such as the bar code of the bar code rotating plate or the bar. The number of spaces and the set angle of each space can be appropriately changed.

The formula for calculating the second period is
The bar code rotating plate is not limited to the above-mentioned embodiment as long as the second period is obtained from the rotation time of the predetermined section of the bar code rotating plate.

Further, in the above embodiment, in order to improve the accuracy of the stop position, one rotation time T _q ′ of the data disk.
Third period T _p which is calculated on the basis of 'using, the second period T _p is to check if contain errors greater than a predetermined value, the third period T _q' of The calculation and the comparison with the second period T _p can be omitted.

Furthermore, the device of the present invention is not limited to use as an emergency measure when a motor rotation pulse is not normally generated, but can of course be used as a normal operation for displaying a predetermined use status display.

In the above-described embodiment, the type in which the use state display is visible to the user is explained, but the cartridge use state display setting device of the present invention has the set use state display information. However, the type that is not visible to the user and is automatically read by the camera is also included.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining the operation of an apparatus according to an embodiment of the present invention.

2 is a perspective view showing a film cartridge used in the apparatus of the embodiment shown in FIG.

FIG. 3 is a schematic diagram for explaining an operation for calculating a second period in the embodiment apparatus shown in FIG.

FIG. 4 is a schematic perspective view showing a main part of a camera in which the embodiment apparatus shown in FIG. 1 is mounted.

5 is a schematic diagram showing the rotational position of the data disk when the film cartridge is set to each usage state display by the apparatus of the embodiment shown in FIG.

6 is a perspective view showing an encoder for detecting a rotation angle of a motor and a second photo sensor in the camera shown in FIG.

7 is a block diagram showing a partial electric circuit of the camera shown in FIG.

8 is a flowchart showing a procedure for setting a usage status display in the embodiment apparatus shown in FIG.

[Explanation of symbols]

 10 film cartridge 11 cartridge body 12 spool 12a index 12b keyway 14 data disk 14a quiet zone 14x bar 14y space 30 motor 35 encoder 36, 40 photo sensor 70 camera

Claims (2)

[Claims] 1. A photographic film cartridge having a bar code rotary plate having film information on one end surface, and the use state of the film can be identified according to the position where the rotation of the bar code rotary plate is stopped. In a cartridge use state display setting device of a camera having a cartridge chamber having an optical sensor for reading the barcode of the barcode rotation plate in the cartridge chamber, based on the reading timing of the barcode by the optical sensor, A first period, which is a period during which the optical sensor passes through a predetermined section of the barcode where the optical sensor is located when a predetermined use state display is displayed, is calculated, and the first period and the Based on the position information of the optical sensor in the predetermined section when the predetermined use state display is displayed, the start position of the predetermined section and the Period calculating means for calculating a second period during which the optical sensor is predicted to pass between the stop positions of the optical sensor in the fixed section; and the optical sensor passing the start position of the predetermined section. A cartridge usage status display / setting device, comprising: rotating plate stopping means for stopping the bar code rotating plate when the second period has elapsed. 2. The position information of the optical sensor is an angle A _P between the start end position and the stop position of the optical sensor when the predetermined use state display is displayed, and the angle of the predetermined section. _Is A _q and the first period is T _q , the second period T _p is 2. The cartridge usage status display / setting apparatus according to claim 1, wherein the cartridge usage status display / setting apparatus is configured to be calculated according to the following equation.