JPH0723775Y2 - Film data reader - Google Patents

Description

[Technical Field] The present invention relates to a film data reader for reading data attached to the surface of a film cartridge and displaying the read film data on a display means.

“Prior art and its problems” In recent years, in response to the automation of cameras, the ISO sensitivity of the storage film and the number of possible shots are coded (DX code) on the surface of the cartridge. On the other hand, in the camera, DX code reading means (usually a plurality of pins by mechanical contact) is provided in the cartridge storage room, and the ISO sensitivity corresponding to the DX code read by this is set in the automatic exposure device to control the exposure. , Again, its ISO sensitivity was displayed.

In the conventional camera, when the cartridge is stored in the cartridge chamber and the back cover is closed, the film is fed by a predetermined number of frames to the shooting position, and the first frame is set (hereinafter referred to as "cueing"), The DX code reading operation is started at the same time when the case back is closed. In the initial stage of this cueing operation, the patrone may move unstable and the DX
The DX code may be erroneously read due to chattering on the code reading pin or a voltage drop or fluctuation. If you misread the DX code like this, there was a problem that the proper exposure was not performed and the photograph taken at a time was ruined.

"Purpose of Invention" The present invention has been made based on the problems in the conventional camera described above, and an object thereof is to provide a film data reading device in which the film data is not erroneously read.

[Summary of the Invention] The invention according to claim 1 is an auto-loading means for detecting the closing of the back lid by loading a film cartridge, and feeding the film by a predetermined number of frames to perform cueing, and the cartridge. A device mounted on a camera equipped with a film data reading means for reading film data attached to the surface of a cartridge loaded in a chamber, wherein after the first one frame is wound up at the cueing, A read control means for causing the film data reading means to read the film data a plurality of times, comparing the read film data of each time with each other, and setting the largest number of the same data as the data of the loaded film; It is characterized by

According to a second aspect of the present invention, in the camera, display means for displaying predetermined data including film sensitivity, and after the start of the cueing and before the end, the film data reading means is made to read the film sensitivity data. And a reading display control means for displaying the film sensitivity on the display means.

According to a third aspect of the invention, in the camera, film sensitivity setting means for setting a film sensitivity by an external operation,
The display means for displaying the predetermined data including the film sensitivity and the film sensitivity set by the film sensitivity setting means are displayed on the display means before the first one frame after the start of the cue is wound up. , The first one above
And a reading display control means for causing the film data reading means to read the film sensitivity data and displaying the corresponding film sensitivity on the display means when a frame equivalent or more is fed in idle. .

"Embodiment of the Invention" The present invention will be described below with reference to illustrated embodiments. Figure 1 shows
FIG. 2 is a block diagram showing an outline of a system of an embodiment of an autofocus single-lens reflex camera to which the present invention is applied, FIG. 2 is a block diagram showing a circuit configuration of the embodiment, and FIG. 3 is film data of the camera. It is a perspective view showing the relationship between the reading device and the cartridge.

First, an outline of a single lens reflex camera to which the present invention is applied will be described. This camera is equipped with an automatic focusing device (AF device), an automatic exposure device (AE device), an automatic film loading device, an automatic winding / rewinding device, and a display device for displaying ISO sensitivity and the like.

In the cartridge storage room of the camera body 10, the cartridge 12
A reading means 16 for reading the DX code 14 provided on the surface of is provided. DX code is 6 ISOs related to ISO sensitivity
It comprises a sensitivity section 14a and an information section 14b regarding the number of shots and the latitude. The DX code reading means 16 is composed of six pins 16a, 16b, ... In this embodiment, and each pin 16a ... Makes contact with each of the ISO sensitivity sections 14a (see FIG. 3).

In the viewfinder, there is an LED 18 for AF that informs the photographer of whether or not the subject is in focus, and for notifying the shooting mode and shutter speed. On the upper surface of the camera body 10 (the upper rear of the pentaprism), a film is provided. Loading,
A liquid crystal display panel (LCD) 20 is provided as a display unit for displaying various shooting data such as the feeding state, ISO sensitivity, film counter, shutter speed and the like.

The auto-loading device of this camera has a film winding drive means (winding motor 22) and a winding completion detecting means (feed detection switch 24, winding completion detection switch 26) for detecting completion of film winding. Film winding motor 22
As is well known, hoisting sprocket through the gear train,
The hoisting sprawl and the rewinding spool shaft are driven to rotate. The film feed detection switch 24 comes into contact with the film F and turns ON / O in association with the winding (running) of the film F.
The FF is repeated to detect the winding of the film F. The winding completion detection switch 26 is turned on when a mirror (not shown) has risen to a position near the completion position of raising, and is turned off at the time of completion of charging (at the same time as the completion of film winding) to detect the completion of film winding. The completion of winding the film F by a predetermined amount can be detected by the film running switch 24, but in the present embodiment, it is detected by the winding completion detecting switch 26. The back cover switch 28 is interlocked with the opening and closing of the back cover.
F / ON and detect the opening / closing.

The autoloading device having the above structure operates as follows. When the film F (Patrone 14) is loaded into the Patrone chamber and the back cover is closed, the back cover switch 28
It changes from OFF to ON. In this state, if the main switch 30 is ON, the DPU 52 turns on the power by a power control signal (not shown). With the back cover open, the film number count data has been cleared internally, so the process of cueing is started and the release magnet 47 and film winding motor 22 are controlled to count the number of films and the counter When the number becomes 4, the cueing is completed.

After cueing is completed, release (release switch 32 is ON)
Each time the release magnet 47, the leading curtain magnet, the trailing curtain magnet, and the diaphragm control magnet (not shown) are driven, exposure control is performed, and the film winding motor is driven.
22 is activated and film F is wound up by one frame. When the film F is wound up to the last frame and cannot be wound further, the film winding motor 22 stops due to the time over. Here, when the rewinding switch 34 is turned on, the film winding motor 22 is rotated in the reverse direction, the rewinding spool shaft is rotated, and the film F is rotated.
It is rewound to the spool in 12.

Next, the outline of the automatic focusing device of the present camera will be described. The camera has a CCD 36 that includes a row of CCDs. The CCD 36 guides an aerial image of a subject which is transmitted through a main mirror and reflected by a sub mirror and is divided into two by a separator lens. Then, the defocus amount is calculated by integrating and comparing the phase difference of the subject image formed on the CCD 36. Then, based on this defocus amount, the autofocus motor 38 is rotationally driven by a predetermined number of rotations in the focusing direction, and the focus lens of the photographing lens 40 is passed through the reduction gear train 39, the AF coupler 41 and the lens drive gear train 42.
L1 moves in the optical axis direction, and focus adjustment is performed.

The above are the main mechanical and optical components of this embodiment, and the above operation is the same as that of the conventional camera.

Next, the reading / display / control means of the camera will be described. The reading / display / control means is basically composed of three microcomputers (CPU50, DPU52, IPU56) and one LSI (PCU54), and these microcomputers control the entire camera and perform arithmetic operations. Functions, reading / display / control functions, other control functions, and other calculation functions are shared.

The CPU 50 is a microcomputer that controls the operation of the entire camera, comprehensive control of other microcomputers, and calculates the defocus amount based on the focus signal from the CCD 36, and controls the autofocus motor 38 based on the calculated values. To do. This CPU 50 has DX data input means 16, film running detection switch 2
4. The winding completion detection switch 26 and the in-lens ROM 43 are input.

The DPU (data processing unit) 52 has a function of controlling the display of the LED 18 in the finder, the light receiving element 45.
This is a mixed analog / digital microcomputer that has the function of inputting the object hardness signal from the A / D converter and the function of inputting switch data such as the photometric switch 46 and the release switch 30. It has a function to perform data communication with each other.

The PCU (Power Control Unit) 54 is an LSI having CMOS and E ² PROM, and pivotally controls the release magnet 47, the film winding motor 22, the autofocus motor 38, etc., and converts the signal from the CCD 36 into a video signal. Send to CPU50.
Of these, the E ² PROM has a function of storing various data such as a DX code and the number of shots even when the power is turned off. Further, the PCU 54 performs mutual data communication with the CPU 50 by an external memory read / write command of the CPU 50.

IPU (Indication Processing Unit) 5
6 mainly controls the display of the liquid crystal display panel 20, but the function to change the ISO sensitivity and set the shooting mode etc. by storing the ISO sensitivity etc. and operating the ISO input switch (film sensitivity setting means) 48 Also has. The IPU 56 performs data communication with the CPU 50 via an interface.

Next, regarding the operation of the present invention, FIG. 5 and FIGS.
Description will be given based on the flowchart shown in FIG. 6C. The automatic loading (cueing) control of film F is controlled by CPU50.
It is performed based on the program stored in. Open the case back and load the cartridge 14 into the case chamber, and close the case back to open the case back and turn the case back switch 28 OFF.
The film counter of CU54 is reset to zero. When the back cover is closed, the back cover switch 28 is turned on, and then the main switch 30 is turned on, the auto loading operation is started and the setting ISO data (sensitivity) stored in the IPU 56 is displayed on the liquid crystal display panel 20. ) Is displayed.

When the film F is wound up by one frame after the auto loading is started, the DX code is read and the ISO data corresponding to the DX code is displayed on the liquid crystal display panel 20 in place of the set ISO data.

Further, when the film F is wound up by four frames and the cueing is completed, various normal photographing information is displayed instead of the ISO display.

The basic operation from the time when the cartridge 12 is loaded into the cartridge storage chamber and the back lid is closed to the completion of indexing will be described in more detail with reference to the flowchart of FIG.

In step 101, the value of the 4-film counter is C
Written to WORK2 in RAM of PU50.

In step 102, it is checked whether the film winding completion detection switch 26 is ON. ON if winding is in progress
Therefore, proceed to step 104, and the winding is completed (O
N), proceed to step 103. In step 103,
The release magnet 47 is energized, a weight corresponding to the mirror rising time is given, and a constant speed release process is carried out before the operation proceeds to step 104.

In step 104, the film F is wound up by one frame, and the process proceeds to step 105.

Further, the data of the film counter is sent to the IPU 56. When this data is 0 to 3, 0 is obtained, and when it is 4 or more, the result of subtracting 3 is sent. IPU56 which received this data,
The result is displayed on the counter display section of the liquid crystal display panel 20.

In step 105, it is checked whether the DX load bit is set to "1". If it is set to "0", the DX code has not been read yet, so proceed to step 106 to enter the DX code and display it.
If it is set to "1", the DX code has already been read, and there is no need to perform the DX code input processing again, so steps 106 and 107 are skipped and step 108 is proceeded to. In addition,
Since the DX load bit at power-on is set to "0", the process first proceeds to step 106.

In step 106, the DX load bit is set to "1" to enable the DX code input processing, and in the DX code input processing subroutine of step 107, the DX code input and its
After the ISO data corresponding to the DX code is displayed on the liquid crystal display panel 20, the process proceeds to step 108.

In step 108, 1 is subtracted from the contents of WORK2, and it is checked whether or not the result is 0. If it is not 0, the film F has not been wound up for 4 frames, so the above WORK
After rewriting the result of subtracting 1 from 2, return to step 102,
Until film F is wound four frames, that is, (WO
RK2) -1 = 0 until steps 102, 103, 104, 10
Repeat the loop process of 5 and 108.

If film F is wound up for 4 frames (WORK2)
Since -1 = 0, go to step 109 and load DX load bit
Is set to "0", and then another routine is started.

Next, the DX code input process will be described with reference to the flowcharts in FIGS. 6A, 6B and 6C. When the subroutine of step 107 is entered, first in step 111, the port of the CPU 50 is switched to the input mode of the port A (DX) for inputting the DX code, and the process proceeds to step 112.

In step 112, the DX code 14 (ISO sensitivity section 14a) of the cartridge 12 is read by the DX code reading means 16 five times at 1 ms intervals, the DX code for each time is written in the RAM 20H to 24H, and the process proceeds to step 113. In this embodiment, the DX code is read five times, and a process of comparing a plurality of these data with each other under a constant condition is performed to prevent a read error. The processing will be described below.

In step 113, the RAM pointer 1 is set to the initial value 20H for sequentially selecting the contents of the addresses 20H to 24H from 20H,
The maximum number of times the same data is read is initially set to 0, the maximum same data is first initialized to the contents of the address 20H, and then the process proceeds to step 114.

In step 114, the RAM pointer 2 is set to the initial value 20H for sequentially selecting the contents of the addresses 20H to 24H, the same data counter for counting the number of times the same data is read is initialized to 0, and the accumulators ACC and EAH are set. The contents of the RAM pointer 1 are stored in the register as comparison data, the address of the RAM pointer 1 is sequentially incremented, and the routine proceeds to step 115.

In steps 115 to 117, the contents of the comparison data set in step 114 are sequentially stored in the RAM pointer 2 from 20H to 20H.
This is a loop for comparison processing with the contents of 24H. In step 115, it is determined whether or not the contents of the RAM pointer 1 stored in the accumulator ACC are the same as the contents of the RAM pointer 2, that is, the first
At the next time, it is checked whether the contents of 20H are the same as the contents of 20H, and further the processing of moving the address of the RAM pointer 2 to the highest place is performed. And if the above contents are the same,
In step 116, the same data counter is incremented by 1, and then the process proceeds to step 117. If they are not the same, step 116 is skipped and the process proceeds to step 117.

In step 117, it is checked whether or not the RAM pointer 2 has reached 25H, that is, whether or not the comparison data has been compared with all the data at other addresses 20H to 24H. If it has not been compared with all, the process returns to step 114, and the loop processing of steps 115 to 117 is repeated to compare with all of the addresses 20H to 24H of the RAM pointer 2, and step 117
When it is checked that the RAM pointer 2 has reached 25H, the process proceeds to step 118. In this comparison process, address 2
The same data counter is incremented by 1 each time the same content as 0H appears.

In step 118, it is checked whether or not the value of the same data counter is larger than the value of the maximum number of same data. That is, if the maximum number of identical data processed immediately before is greater than the maximum number of identical data before that, the maximum number of identical data is replaced in step 119 and the data (content of EAH register) is changed to the maximum number of identical data. After writing, proceed to step 120. On the contrary, the immediately preceding maximum number of identical data is the same as the previous maximum number of identical data,
Alternatively, if the number is small, step 119 is skipped, the maximum number of identical data is rewritten, and the content of the maximum identical data is not changed, and the process proceeds to step 120.

In step 120, it is determined whether or not the address of the RAM pointer 1 is 25H, that is, whether all the data of 20H to 24H of the RAM pointer 1 is compared with all of the data of 20H to 24H of the RAM pointer 2. To check. If all the comparison work has not been completed, the process returns to step 114, the address of the RAM pointer 1 is incremented by 1, and the processes of steps 114 to 120 are performed. In other words, until all DX data comparison work is completed (RAM pointer 2 = RAM pointer 1
(Until 25H)) The loop process of steps 114 to 120 is repeated, and when the comparison work of all the DX data is completed, the process proceeds to step 121.

The above steps 111 to 120 are basically 5 steps.
Two sets of identical DX data are set as one set, all DX data of one set are sequentially compared with all DX data of another set, and the same data is represented the most times. Is regarded as a normal value, and when all five data are different, the first data read first is regarded as a normal value, and when two kinds of the same data are expressed twice, of the two kinds of data, The first data read first is regarded as a normal value.

In step 121, it is checked whether all five data are different, and if they are not different, step
Jump to 123, and if different, the process that regards the data that appears the most times as a normal value has been completed, and the subsequent process is advanced. In step 122, it is checked whether or not cueing is in progress (loading). If cueing is completed, it is not necessary to display the DX data, and the routine returns. If loading is in progress, step 123 is reached.

In step 123, the DX data is transferred to the register DX SVT of the E ² PROM.
, And the DX shift bit is cleared in step 124 to enable the display of DX data. The DX data here is the same contents as the above-mentioned maximum.

In step 125, it is checked whether or not there is a DX code. If there is no DX code, the DX code is not displayed, so jump to step 133. If there is a DX code, step 126
Proceed to step 3 to see if the back cover is open (back cover switch 28
Check whether or not F is working. Then, if the case back is open, jump to step 133, and if it is closed, step 1
Proceed to 27.

If there is no DX code, or if the case back is open, DX code display processing is not performed. So step 13
In 3, it is checked whether the register DX SVT of the E ² PROM is “0”. If it is “0”, the display regarding the DX code is not performed, so the process jumps to step 135, and if it is not “0”, the step 134 is performed. Go to step and set the DX SVT register of the E ² PROM to "0" so that DX data is not displayed.
Continue to 135.

At step 135, the contents of the register IPU SVT of the E ² PROM are written in the buffer register DX DATA, and the routine proceeds to step 136.

In normal operation with DX specification film loaded,
125, from step 126 to step 127. Step 127
Then, it is checked whether the contents of the register DX SVT of the IPU56 is the same as the contents of the register DX SVT of the E ² PROM. If they are the same, the process jumps to step 132, and if different, the process proceeds to step 131 to read the DX code. (DX SVT) register for E ² PROM
After writing to DX SVT, proceed to step 132.

In step 132, E ² for setting DX data in IPU56
It is checked whether the content of the register IPU SET SVT of the PROM is the same as the content of the register DX SVT. If they are different, the process proceeds to step 133 to rewrite, and if they are the same, it is not necessary to rewrite, and the process jumps to step 136.

In step 133, it is checked whether or not the cue is in progress. Then, if cueing is in progress, in step 134, E ² PRO
After writing the contents of the register DX SVT to the register IPU SVT of M, jump to step 136 and set a DX shift bit in step 135 to give a warning if not cueing, and then proceed to step 136.

In step 136, it is checked whether cueing is in progress. If it is not in cueing, ISO data is not displayed.
Proceed to step 38, and set the ISO compulsory bit in step 137 to display the ISO data if cueing is in progress, and then set step 138.
Proceed to.

In step 138, the ISO data corresponding to the DX data is converted to IPU5.
The read ISO data is displayed on the liquid crystal display panel 20 by writing to the register DX SVT of 6 and replacing the set ISO data displayed at the start of cueing. And step 13
The ISO compulsory bit is reset at 9 to enable the change of the ISO data, and in step 140, the SWU 'set and the DX shift bit are written in the registers SWU1 and IPU RLZ of the IPU 56 and the process returns to the cueing routine.

In the cue processing routine, the processing is repeated in a loop of steps 102 to 105 and step 108 until the cue is completed. When the film F feed for the fourth frame is completed in step 104, the film counter of the IPU56 is set to 1
Therefore, the IPU 56 switches the display of the liquid crystal display panel 20 from the ISO data display to the normal shooting information display. Then, in step 109, the DX load bit is set to "0", and the cueing process is completed. Then exit this routine,
Proceed to the main routine (not shown). In the main routine, it waits for the photometry switch 46 and the release switch 32 to be turned on in the state where the photometry calculation and the distance measurement calculation can be performed.

In short, the above display operation is first performed with ISO 100 on the camera body 10.
When the DX specification film is loaded, the back cover is closed and the power is turned on, the cueing operation is started, and at the same time, the liquid crystal display panel 20 first sets the set ISO data, which is “8” in this embodiment.
0 _ISO ”is displayed (see Figure 4A).

When the film F is wound up for the first frame, the DX code is read and written in the RAM of the CPU50 and the IPU56.
The ISO data “100 _ISO ” corresponding to the read DX code is displayed on the liquid crystal display panel 20 (see FIG. 4B). This display is held until the film F is wound up by four frames and cueing is completed.

When cueing is completed, other photographing data is displayed instead of "100 _ISO ", in this embodiment, program normal "P", shutter speed "250", and aperture "F8" are displayed (4C).
See figure).

As described above, in the present embodiment, after starting the film cueing,
The DX code is read after winding up by one frame and displayed until the completion of cueing. Therefore, the DX code can be read accurately without being affected by the initial vibration of the cartridge 12 and the fluctuation of the voltage. You can check the ISO sensitivity. The DX code reading time may be after winding up two or more frames.

Further, in the present embodiment, the DX code is read five times at a predetermined time interval, and if there is even one different data, the process of setting the same number of the same data as the normal value is performed, so the DX data is erroneously read. There is nothing. The number of readings and the reading interval are arbitrary.

Further, in the present embodiment, the ISO data set previously is displayed at the start of cueing, and if it is a Patrone without a DX code, the ISO data display is retained, so the set ISO data is set.
It is very convenient because you can check the data and you do not have to reset the ISO data.

"Effect of device" As is clear from the above description, since the present invention reads the film data after the first frame is wound after the start of the film cueing, the influence of the vibration of the cartridge, the chattering, the fluctuation of the voltage, etc. The film data is not read and there is no mistake in reading.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a system of an embodiment of an autofocus single lens reflex camera to which the present invention is applied, FIG. 2 is a conceptual diagram showing an outline of a circuit of the camera by a block, and FIG. The perspective view showing the relationship between the film data reading device of the camera and the cartridge, FIG. 4A, FIG. 4B and FIG. 4C show the display of the liquid crystal display panel of this embodiment at the beginning of the cueing, the middle of it. And a front view shown in a state after completion of cueing, and FIG. 5 is a flowchart regarding cueing operation,
6A, 6B and 6C are flowcharts relating to the DX code reading process. 10 ... Camera body, 16 ... DX code reading means, 20 ...
… Liquid crystal display panel, 22 …… Film winding motor, 24 ……
Film feed detection switch, 26 …… Film winding completion detection switch, 28 …… Back cover switch, 30 …… Main switch,
48 …… ISO setting switch

Claims (5)

[Scope of utility model registration request] 1. A surface of a patrone loaded in the patrone chamber and an auto-loading means for detecting the closing of the back cover by feeding a film patrone and feeding the film by a predetermined number of frames in advance for cueing. A device mounted on a camera equipped with a film data reading means for reading film data attached to the film data, wherein the film data reading means is provided with a plurality of films after the first one frame has been wound up at the time of the above-mentioned cueing. A film data reading device characterized by comprising reading control means for reading data, comparing read film data of each time with each other, and setting a maximum number of identical data as data of the loaded film. . 2. A surface of the patrone loaded in the patrone chamber and an auto loading means for detecting the closing of the back cover by feeding a film patrone and skipping the film by a predetermined number of frames to perform cueing. A device mounted on a camera equipped with a film data reading means for reading film sensitivity data attached to a display means for displaying predetermined data including film sensitivity, and after the start of cueing and before the end, A film data reading device comprising: a reading display control unit that causes the film data reading unit to read film sensitivity data and display a corresponding film sensitivity on the display unit. 3. A film patrone loaded, an auto-loading means for detecting that the back cover is closed and feeding the film by a predetermined number of frames, and a film sensitivity attached to the surface of the patrone loaded in the patrone chamber. An apparatus mounted on a camera equipped with a film data reading means for reading data, comprising: a film sensitivity setting means for setting a film sensitivity by an external operation; a display means for displaying predetermined data including the film sensitivity; Before the first one frame equivalent is wound up after the start of feeding, the film sensitivity set by the film sensitivity setting means is displayed on the display means, and the first one frame equivalent or more is fed. Sometimes, the film data reading means reads the film sensitivity data and the corresponding film sensitivity is Film data reader being characterized in that and a reading display control means for displaying on the shown means. 4. The film data according to claim 2 or 3, wherein the reading display control means causes the display means to display other predetermined data on the display means after the completion of the cueing. Reader. 5. The read / display control means according to claim 2, wherein the film data read means is provided with a plurality of film sensitivities after the first frame corresponding to the beginning is wound up. A film data reading device, wherein data is read, and the read film sensitivity data of each time are compared with each other, and the same data having the highest number of appearances is set as the sensitivity data of the loaded film.