JPH0614206Y2 - Electronic control camera - Google Patents

Description

[Detailed description of the device]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control camera provided with an autowind mechanism that automatically winds a film after release by one frame, and an autowind mechanism that rewinds a film that has been winded by a motor. 2. Description of the Related Art Conventional technology and its problems Recently, there has been a remarkable progress in automation and computerization of still cameras such as lens shutter cameras and single-lens reflex cameras. For example, focusing by automatic distance measurement, flash by automatic photometry, shutter speed, control of aperture such as aperture control, automatic loading when film is loaded,
The diversification of its functions is gradually progressing from auto-winding (automatic winding) to auto-rewinding (automatic rewinding) after release. By the way, in the electronic control camera provided with the auto-rewind mechanism and the auto-wind mechanism which the applicant has already proposed, a film switch that is turned ON / OFF as the film runs, and a rewind end or a film depending on the combination of the timer. The over-end is detected and the detection result is stored in the memory. Although the merit of storing the detection result in the memory is great, it may be an obstacle if it is exceptional. That is, if the battery voltage is low,
Even if the film still remains, the rewind end or the film over end may be judged. Although these details will be described in the embodiment, any problems peculiar to the use of the memory and the non-volatile memory have occurred. Purpose of the Invention This invention has been made in view of the above-mentioned problems, and when the detected film over end or rewind end data is erroneously written in the memory, it is corrected by the judgment in the camera. It is an object of the present invention to provide an electronically controlled camera that can be used. Means for Solving the Problems In order to achieve the above object, an electronic control camera according to the present invention has a film running motor for running a film and a battery built-in to supply a driving current to the film running motor to supply a film. Winding and rewinding driving means, voltage checking means for checking whether the battery voltage is below a predetermined value, detecting means for detecting film over-end and re-winding end, and detecting means for over-end or re-winding end When this is detected, these data and the check data of the voltage check means at that time are stored in a rewritable non-volatile memory, and the check data is read from the memory and the battery voltage at the time of chucking is read from this data. If the value is less than or equal to And a data erasing means for erasing the data at the server end or the rewind end. Effect Since the present invention has the above-described configuration, it is possible to erase the data of the film overend or the rewind end written when the voltage of the battery has dropped to a predetermined value or less as a result of an erroneous judgment. it can. Embodiment Hereinafter, the present invention will be described with reference to the drawings. 1 to 5 are external views of a single-lens reflex camera according to an embodiment of the present invention. The single-lens reflex camera shown here can perform film operations such as loading, winding, and rewinding with a motor, and these operations are automatically performed based on a built-in program described later and information from each switch. Can be controlled. As shown in the figure, this camera is composed of a body 1 and a lens 2 detachably mounted on the body 1. As shown in FIG. 2, a main switch 3, a shutter switch 4, a select lever 5, a mode / drive lever 6, and an ISO / exposure compensation lever 7 are provided on the upper surface of the body 1, and a pentaprism housing in the central portion is provided. A liquid crystal display panel (hereinafter, referred to as LCD panel) 8 for centrally displaying the state of the film, the conditions set in the camera, and various data necessary for shooting is provided on the top of the screen. Note that this LCD panel _{8, a, b 1, b} 2, b 3, b 4, c is provided as a segment for displaying film running relationship as shown in the enlarged view of Figure 3. When the back cover 9 on the back of the body is opened as shown in FIG. 4, the cartridge chamber 10, rewinding shaft 11, sprocket 12,
The spool 13 etc. can be visually recognized. Rewinding shaft 11 above
When the film is rewound, the sprocket 12 and the spool 13 are driven to rotate by a film running motor (not shown) built in the body 1 when the film is fed, and when one is driven, the other is free. It is configured. Further, the body 1 is provided with a back cover switch 15 which is turned on / off by engaging and disengaging a claw piece 14 provided on the free end side of the back cover 9, and is coaxial with the sprocket 12 and independent of the sprocket 12. Then, a rotatable roller 16 is provided. The roller 16 is pressed against the lower end of the film mounted when the back cover 9 is closed and rotates as the film travels.
The roller 16 is turned on / off in accordance with the rotation of the roller 16 to detect the running state of the film. As shown in FIG. 5, a rewind switch 19 including a rewind button 17 for unlocking and a rewind lever 18 slidable when the rewind button 17 is pushed is provided on the bottom surface of the body 1. Has been. This rewind switch 19 holds the rewind position by sliding only when the back cover 9 is closed,
It is mechanically configured to return from the held rewind position to the normal OFF position by opening the back cover 9. A wind completion switch is provided in the body 1 in addition to the switches described above. This camera is equipped with a so-called auto-wind mechanism that automatically winds the film for one frame after release, as will be described later. However, the above-mentioned wind completion switch is turned on together with the release, and the film running motor is turned on during wind. It is a mechanical switch that turns off when the film has been rotated by an amount equivalent to one frame of wind. Next, an outline of the control circuit incorporated in the single-lens reflex camera according to this embodiment will be described with reference to FIG. The control circuit shown in FIG. 6 has a DPU (Dat (Dat)
a Processing Unit) 21 and IPU (Indication Processi)
ng Unit) 22 CPU and PCU (Power Conrrol U)
(nit) 23 and functional LSIs, and peripheral circuit units. The main CPU 20 is an 8-bit microcomputer and has a ROM (Read-Only Memory) with a capacity of 16 Kbytes.
y: fixed storage device) and RAM with a capacity of several hundred bytes
(Random Access Memory)
It is composed of an 8-bit A / D converter (analog / digital converter), performs high-speed processing with a 9-MHz clock, and has 4 to 7 bits between the other two CPUs 21, 22 and PCU23. It connects with a data bus and controls the exchange of data between them. Further, the switch data of the film switch 24 and the wind completion switch 25 described above is input to the main CPU 20. The DPU 21 is a 4-bit microcomputer and mainly performs photometry and strobe-related data processing (explanation thereof is omitted). Switch data of the main switch 3 and the release switch 4 is input to the DPU 21. The IPU22 is a 4-bit microcomputer, which mainly controls the display on the LCD panel 8
The data such as the state of the film and the number of shots displayed on the D panel 8 is stored and held unless the power is turned off by removing the battery. This IPU22 has a select lever 5,
Switch data of the mode / drive lever 6, the ISO / exposure compensation lever 7, and the rear cover switch 15 are input. The PCU23 is an E ² PROM (Electronically Erasable PROM).
It is a one-chip LSI consisting of a programmable read-only memory (CMOS) and a CMOS capable of simultaneously handling an analog signal and a digital signal. The E ² PROM is a memory that is rewritable by an electronic signal from the CPU, and can hold data and programs once recorded indefinitely without backing up the power supply. The E ² PROM has a camera operating state, that is, a film wind / rewind state,
Data such as the number of shots is stored in memory moment by moment, and even if the battery is removed for some reason, it retains the data so that all operations can be continued at the same time when the battery is restored. In addition, the CMOS processes the video signal from the CCD (Charge Coupled Device) sensor 26 mainly used for focusing, and the AF (Auto
The focus lens driving motor 27 and the release magnet 28 are driven (the explanation is omitted), or the film traveling motor 29 is driven. Next, the operation of the control circuit and the camera based on the control circuit will be described with reference to the flowcharts shown in FIGS. In addition, the matters explained below are the control of the film running relation directly related to the present invention, that is, the loading,
Limited to wind and rewind, photometry not directly related and shutter speed based on this measurement result,
A description of the diaphragm, control of the amount of strobe light, distance measurement and autofocus based on the measurement result, or setting operation of various modes by the user is omitted. Further, when the main switch is OFF, the operations such as photometry, distance measurement, and release, and the operations of the motors 27 and 29 are locked in principle, but here, for simplification of description, the main switch 3 Only the operation in the ON state will be described.

[Main flow]

First, an outline will be described according to the main flow of FIG. When the operation starts, the main CPU 20 first determines in step (hereinafter referred to as S.) 1 whether the RE initialization bit is 1 or not. The RE initialize bit is set to 1 when the IPU 22 determines that the power supply voltage once dropped below a predetermined voltage has returned due to the battery being removed and then reattached. In that case, the S.S. When the routine proceeds to step 2 and the inside of the RE initialization subroutine described later is processed and it is 0, that is, when the battery is not attached / detached, the S.I. Go to 3. S. In 3, it is judged whether the latest information on U, that is, ON / OFF of the rear cover switch 15 is 1. The back cover switch 15 detects its state successively by the IPU 22 in a cycle of about 100 ms, and when the detection result is different from the information U ′ of the back cover switch 15 in the previous cycle, the PCU 23 via the main CPU 20. E ² PROM in
Rewrite the back pig switch bit of. In addition, U, U '
0 indicates that the back lid is closed, and 1 indicates that the back lid is open. S. If the determination in step 3 is Yes, that is, U = 1 (the back cover 9 is open at the present time), S.S. 4, the information U'of the rear cover switch 15 in the previous cycle is set to E ²
Call from PROM to determine if it is 1. S. If the judgment in 4 is No, that is, the back cover 9 was closed before U ′ = 0 (100 ms), this 100 m
It means that there was an operation of closing → opening during s. In this case, the power of the main CPU 20 is forcibly turned on by the signal from the IPU 22, so that the main CPU 20 operates in the S. 5, the open process, that is, the number of films stored in the E ² PROM is cleared, the load OK bit, the film over end bit, and the rewind end bit (each described later) in the E ² PROM are set to 0, and U ′ is set to 1 And perform the process. After that, S. The process of 6 is performed. S. If the determination in 4 is Yes, that is, if U ′ = 1, then the back pig 9 has been opened earlier,
In that case, S. Skip S.5. Go to 6. S. In 6, the main CPU 20 calls the rewind end bit from the E ² PROM and determines whether this is 1 or not. Rewind End Bit, Rewind Switch
When 19 is set to the rewind position and the film running motor is rotated, it becomes 1 from the end of the rotation of this motor until the back gutter 9 is opened, and becomes 0 in other states. Here, since the rear cover 9 is open, the rewind switch 19 is always returned to the OFF position, and the rewind end bit is S.S. It should be 0 when the back cover 9 is opened by the process of 5. However, in some exceptional circumstances, the rewind end bit may be 1 even if U = U ′ = 1.
In this case, the rewind end bit is S. 7 as 0 and S.I. 13. If this bit is 0, S.S.
Skip S.7. Move to 13. S. 3 is negative, that is, when the back cover 9 is currently closed, S.S. Proceed to S.8. Four
When ^{E 2} to U 'also IPU22 via the main CPU20
Call from PROM to determine if this is 1.
Since U = 0 here, it is not necessary to rewrite U'when U '= 0, and S.S. In step 9, rewrite U '= 0. After that, S. At 10, it is determined whether the rewind switch 19 is ON. When the rewind switch 19 is off, the S. Proceed to 11 and in this step E ² PRO
Call the number of films from M and determine if it is less than four. The number of films mentioned here is detected from the number of times the wind completion switch is turned ON / OFF after the back cover 9 is opened and closed.
Displays a value obtained by subtracting 3 from the number of films as a photographable frame count on the LCD panel 8. In this camera, when the film is set and loaded, the standard for completion of loading is to feed four films. If the judgment in 11 is affirmative, S. 12
In, the loading subroutine is called, and the loading process described later is performed. If the determination is negative, that is, if the number of films stored in the E ² PROM is 4 or more, it is considered that the loading is completed, and S. 12 is skipped and S. Proceed to 13. S. At 13, it is determined whether the wind completion switch 25 is ON. When this switch 25 is ON, it means that the wind is not completed. Proceed to step 15 to be processed in the wind subroutine described later. If the wind completion switch 25 is off, return to return to another A
E processing or AF processing is performed. The S. When it is determined that the rewind switch 19 is ON in step 10, S.M. 16, the S. As in the case of 6, the rewind end bit is called from the E ² PROM and it is judged whether or not this is 1. S. If the determination at 16 is negative, that is, the rewind end bit is 0, then the rewind is considered incomplete and S.S. At 17 the rewind subroutine is called. S. When the judgment in 16 is Tes, that is, when the rewind end bit is 1, it is considered that the rewind has already been completed, and thus S.S. Step 17 is skipped and the process returns to perform another AE process or AF process. The above is the main flow.

[Loading subroutine]

Next, the processing in each of the subroutines shown in this main flow will be sequentially described from the first loading operation performed as an operation during actual shooting. Loading is an operation when loading a film on a camera. In this camera, the Patrone 10
If the front end of the film is pulled out to a certain extent and is put on the spool 13, the film is automatically wound to a frame where the film can be taken by closing the back cover 9. Since this camera is configured to read the Dx code of the film at the time of loading, this operation will be briefly described. FIG. 8 is a flow chart of this loading. As described above, the loading flow starts when the back cover 9 is closed, the rewind switch 19 is off, and the number of films stored in the E ² PROM is less than 4. First, S. In 100, a drive voltage is applied from the PCU 23 to the release magnet 28 by a release signal from the main CPU 20, and a constant speed release is performed. When the release is performed, the wind completion switch 25 is turned on, and the S. 101
Then, until the wind completion switch 25 is turned off, the sprocket 12 and the spool 13 are rotated by the rotation of the film traveling motor 29, and the wind for one frame is performed.
And S. At 102, one is added to the number of films in the E ² PROM. The details of this wind will be described later in the description of the wind subroutine. Then in S103, set the ISO forced display bit to 1,
During the ISO data communication between the main CPU 20 and the IPU 22, the transmitted ISO data can be displayed on the LCD panel 8. Then S. At 104, set D to the Patrone
Determine if there is an x-code. If there is a Dx code, S.D. Proceed to 105, and let the main CPU 20 read the Dx code. And S. In step 106, the ISO data in the E ² PROM is rewritten with the ISO data of the Dx code and the S.S. This data is transferred to IPU2 at 107
2, and display it on the LCD panel 8. S. If the judgment at 104 is negative, that is, if the Patrone does not have a Dx code, the main C
PU20 is S. The ISO data previously set in 108 is called from the E ² PROM, transferred to the IPU 22, and the LC
Display on the D panel 8. When the above ISO data writing and data transfer for display are completed, S. Set ISO forced display bit to 0 in 109
And Then S. At 110, a counter provided in the main CPU 20 and for counting ON / OFF of the film switch 24 is cleared. Next, S. 111 and S. Rewind switch 19 at 112
When the rewind switch 19 is ON, or when U = 1, the S.S. 113-S. Return to the main flow without performing the processing up to 123. Continue to 113. The rewind switch 19 is ON during the rewind or the period until the rear lid is opened after the rewind is completed, in which case the rewind is prioritized. Also,
U = 1 means that the back cover 9 is open. In such a case, there is no need to load the film, so that the loading is not performed. S. 111 and S. If both decisions at 112 are negative, then S. Proceed to S.113. As with 100, constant speed relays are performed, and S.I. In S.114. Winding is performed as in 101 At 115, add 1 to the number of films in the E ² PROM. When the wind for one frame is completed, S. Proceeding to 116, it is judged whether or not the count number of the counter, which has counted the number of times the film switch 24 is turned ON / OFF, is greater than three. The film switch 24 is configured to repeat ON / OFF eight times in one frame when the film is running normally and there is no error due to slippage, but the film is not loaded. Do not turn on / off when the film does not run due to insufficient mounting, etc. S. If the determination at 116 is affirmative, the film is considered to have started and S. At 117, the loading bit is set to 1. If this bit is set to 1, IP
A drive signal is issued from U22 to the LCD panel 8 and the LCD
Of the segments on the panel 8, the segment a is turned on, and the segments b ₁ , b ₂ , b ₃ , b ₄ , and c are sequentially blinked from the cartridge side to the spool side to display that loading is in progress. On the contrary, S. If the judgment in 116 is negative, it can be considered that the film is not running, so the above display is not performed and S.S. Skip S.117. Continue to 118. S. In 118, it is judged whether the number of films in the E ² PROM is four or more, that is, whether the release and wind are repeated four times required for loading, and if the prescribed number is not reached, S is determined. ． Return to 111. This loop is repeated until the determination at 118 becomes Yes. Then, when exiting this loop, S. 11
9, S. Proceeding to 120, if the loading bit is set to 1, this is set to 0. Then S. At 121, it is determined whether the total number of counts of the counter is greater than 6. If it is larger than 6, it is considered that the film is loaded normally,
S. At 122, the bit of the load OK of the E ² PROM is set to 1, and the S. IPU22 this bit in 123
Then, all the segments a, b, and c of the LCD panel 8 are turned on as a load OK display. S. If the determination at 121 is negative, it is considered that normal loading has not occurred and S. 12
2, S. Skip 123 and return to the main flow.

[Wind subroutine]

Next, based on FIG. 15. The wind subroutine will be described. Winding is a process of winding the film by one frame after the release, and is automatically performed by the operation of the film running motor in this camera as described above. As can be understood from the main flow, as long as the main switch 3 is ON, the wind can be operated regardless of whether the back cover 9 is opened or closed, but as will be described later, the film is used up and the film over end bit becomes 1. , And if the rewind end bit is set to 1 after the rewind of the film is completed, the operation does not work. S. of the main flow Wind complete switch 25 at 14
When it is determined that the ON state is ON, that is, when the wind is not completed, first, S.S. At 200, the bit in the wind is set to 1. The information of this bit is sent to the IPU 22 to turn on the segments a and c of the LCD panel 8 and to make the segments b ₁ , b ₂ and b
₃ and b ₄ are sequentially blinked from the cartridge chamber 10 side toward the spool 13 side. Then, S. The timer of 1.5 seconds is set and started in 201, and S. At 202, the rotation of the film traveling motor 29 is started to rotate the sprocket 12 and the spool 13. Stopping of the motor 29 is regulated by either one of two factors, that is, the wind completion switch 25 is turned off or the time is exceeded by energizing for 1.5 seconds or more. That is, S. In 203, the state of the wind completion switch 25 is judged, and here the wind completion switch 25 is turned off.
If not, S. Go to 204 and set the timer
It is determined whether 1.5 seconds have passed. If any of the judgments are negative, this S. 203, S. Continue around the loop of 204. Then, if the determination result in any of the steps is affirmative, the loop is exited, but the subsequent processing differs depending on which step is exited. S.
When exiting from 203, wind completion switch 25 is OFF
Therefore, it can be considered that the film running motor 29 has rotated by the amount of one frame of film. So S. At 205, the motor is stopped and S.M. At 206, reset the timer in preparation for the next wind. Next, S. At step 207, 1 is added to the number of films in the E ² PROM, and S. S. 208. After setting the bit in wind set in 200 to 0, the process returns to the main flow. S. When the loop is exited from 204, that is, when 1.5 seconds elapse before the wind completion switch 25 is turned off,
S. At 209, the film traveling motor 29 is stopped and the S.M. At 210, the bit in the wind is set to 0. This state is generally realized when the film is used up and the film traveling motor 29 is not allowed to rotate any more. S. In step 211, the film over end bit of the E ² PROM is set to 1, and the S. IP this bit at 212
Transfer to U22. The IPU 22 is based on this signal and the LCD
The panel 8 is driven so that the segment a is lit and b and c are blinked in synchronization. When the film over end bit is set to 1, the power-off process is performed, and operations other than the rewind process cannot be performed. In a conventional camera with an automatic wind function, when the release switch is turned on even when the film is finished, the film traveling motor is energized in an attempt to wind the film, so that the sprocket 12 and the spool 13 are rotated.
Then, since the load on the motor is large, the end of the film is judged again and the power supply is cut off. However, if such an operation is repeated, there is a risk that the film will be unnecessarily applied and the film will be damaged, and it is also not desirable because it imposes an extra burden on the camera side. In this camera, when the power-off process is performed as described above, the operation of the release switch etc. is locked, and it is prohibited to make the camera perform unnecessary operation, so there is no problem as in the past, and the film and camera It's a good thing for both.

[Rewind Subroutine]

FIG. 10 shows the S.D. of the main flow. 18 is a flowchart of the rewind subroutine shown in 17. Rewinding is a process of rewinding a film that has been taken or is being filmed into the cartridge, and is performed when the rewind switch 19 is turned on in this camera with the back cover 9 closed as described above. This is done automatically by the film traveling motor 29. When entering the rewind flow, firstly S. At 300, the above-mentioned film over end bit is called from the E ² PROM and it is judged whether it is 1 or not. When this bit is 1, S. This is set to 0 in 301, and if 0, S.S. Skip 301 and go to S. Continue to 302. S. At 302, it is determined whether or not the load OK bit described above is 1. If this bit is 1, then S. 303
, The rewinding bit is set to 1 and transferred to the IPU 22, and the segments a and c of the LCD panel 8 are lit, b ₁ ,
B ₂ , b ₃ , and b ₄ are sequentially blinked from the spool 13 side toward the cartridge chamber 10 side. If the load OK bit is 0, then S. Skip S303 and S.S. Continue to 304. S. At 304, the rotation of the film traveling motor 29 is started to rotate the rewinding shaft 11. And S. Set a 6-second timer on the 305, start it, and At 306, it is determined whether the film switch 24 is ON / OFF. If there is no ON / OFF of the film switch 24, S. The process proceeds to step 307 to determine whether it is time out. Return to 306. Even if the film switch 24 is not turned ON / OFF, this loop is turned on for 6 seconds after the timer starts. If the film switch 24 is turned ON / OFF during the process, S. 308
And the timer is reset, and S. It is newly set and started at 305. The film switch 24
You can get out when the shortest 6 seconds have passed since was turned on / off last. This 6 seconds is set with consideration given to the time it takes for the film to completely fit in the cartridge after leaving the roller 16 for turning on / off the film switch 24, and with some allowance. After exiting the above loop due to time over, S. Proceeding to 309, the film traveling motor 29 is stopped. S. At 310, the rewind bit is set to 0, and accordingly, the above-described rewinding display on the LCD panel 8 is stopped. Next, S. In step 311, the rewind end bit of the E ² PROM is set to 1, and S.S. At 312, this data is transferred to the IPU 22, and the IPU 22 blinks the segment a of the LCD panel 8 to indicate that the rewind is completed. S. At 313, the state of the battery when the rewind end bit is set to 1 is determined. If the voltage of the battery is equal to or lower than the predetermined voltage, the S. At 314 E ² PRO
The battery check bit of M is set to 1, and in other cases, S.M. 314 is skipped and power off processing is performed. In this state, other processing cannot be performed unless the rear cover 9 is normally opened and the rewind end bit is set to 0. In addition, S. 313, S.I. For more information on processing 314, see the following RE
It will be described at the time of the initialization process.

[RE Initialize Subroutine]

FIG. 11 shows S.M. of the main flow. This is a subroutine for performing the RE initialization processing shown in 2. As described above, the RE initialization is performed when the battery is removed or installed, or when the performance recovers due to the temperature rise after being placed in a low temperature condition where the battery performance declines. This is a process performed when the voltage is returned to the voltage or higher. If the voltage of the battery is kept above a predetermined value, the data can be held in the RAM of the main CPU 20 or the IPU 22, but if the power is turned off, these data will be erased. In this camera, of the fluctuating data, the data that is not desired to be erased even when the power is turned off is stored in the E ² PROM, so that this data can be recalled after the power supply voltage is restored. In S400, various kinds of data stored in the E ² PROM as described above are read into the main CPU, and the data is stored in the S.P. It is transferred to IPU22 by 401. S. In 402, it is determined whether or not the data is transferred to the IPU 22, and if the setting is completed, the S.S. In 403, the RE initialization bit is set to 0. If the settings have not been made, S.M. Skip 403. Next, S. At 404, the above-mentioned rewind end bit is called from the E ² PROM and it is determined whether it is 1 or not. If this bit is not 1 or 0, then S.
405-S. 407 is skipped and the process returns to the main flow. If it is 1, it is judged whether the rewind end clear bit written in the E ² PROM is 1 or not. This rewind end clear bit is set to 0 or 1 at the time of shipment. When it is 1, the process of setting the rewind end bit 1 stored in the E ² PROM to 0 under a predetermined condition is allowed. To be done. The rewind end bit becomes 1 in addition to the general case where the film is completely stored in the patrone as described above, and the following may be considered. That is, this is a case where the battery voltage is exhausted during the rewind process, or the battery performance is degraded by cold outside air, so that the power supply voltage is reduced. If the power supply voltage drops, the effect first appears in motors that consume a lot of power. Therefore, the film running motor 29 may stop despite the control circuit of the detection system operating. In this case, the rewind end bit becomes 1 before the film is stored in the cartridge. It is also possible. In the electronically controlled camera as shown here, unlike the conventional manual rewind, since the motor is operated by the control circuit to perform the rewind, the situation judgment different from the actual situation is made as described above, and the rewind bit is changed. 1
In this case, the camera cannot perform any other operation unless the back cover 9 is opened. Before storing the photographed film in the cartridge, the back cover 9
If the opening is performed, the photographed film becomes unusable unless the operation is performed in a dark room or the like.
So, with this camera, S. 312, 31
As mentioned in 3, 314, the condition of the battery at the time of setting the rewind end bit to 1 is checked on condition that the rewind end clear bit is set to 1, and the battery voltage has reached the predetermined value. If not, the battery check bit of the E ² PROM is set to 1. When the battery check bit is 1, it is considered that the processing has been advanced under the judgment different from the actual situation as described above, and the S. In 407, the rewind end bit is set to 0. When the RE initialize subroutine is called, it is not necessary to set the battery check bit to 1 because it is assumed that the battery voltage has returned to a predetermined value or higher. Set this bit to 0 in 408
To return to the main flow. The above-mentioned erroneous determination may occur not only during rewinding but also during winding. That is, the film over-end bit is set to 1 not only in the general case where the film is used up as explained at the time of winding, but also in the middle of the film due to the voltage drop of the battery as in the case of rewinding. It is possible. If the film over-end bit is set to 1 in such a situation, the camera will only accept rewind operations, and the remaining film will be wasted. In order to avoid such a problem, although not shown in this example, the same battery chuck as in rewinding may be performed at the time when the film over end bit is set to 1. With such a configuration, at the time of the RE initialization process, the film over-end bit set under the situation judgment different from the actual situation is set to 0, and the remaining film can be used for shooting. This is the end of the description based on the flowchart of the film traveling-related operation. As can be understood from the above description, the electronically controlled camera shown in this example is provided with a large-scale control circuit which is not provided in the conventional camera in order to reduce the burden of operation by the user as much as possible. It enables more accurate and precise operation by user operation. And, it is used as a memory for variable data that secures this accuracy as a more reliable E
² PROM. Even an electronic control camera equipped with a control circuit capable of performing various kinds of processing is not very convenient because the variation data set before the detachment is erased due to the detachment of the battery or the like. In the electronic control camera shown in this example, by using the E ² PROM as the memory for the fluctuation data, it is possible to retain the various fluctuation data described above regardless of the attachment / detachment of the battery, which is very convenient. Has become. Effects As described above in detail, the electronic control camera according to the present invention uses the data of the film overend or the rewind end written when the voltage of the battery has dropped to a predetermined value or less as a result of an erroneous judgment. Since it is configured so that it can be erased, the risk of misjudgment when the voltage of the battery is low is avoided, and in the normal case it is stored once and does not have to be detected again when the data is used next time. You can fully utilize the merit of using memory.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram corresponding to claims of an electronically controlled camera according to the present invention, and FIGS. 2 to 11 show an embodiment of the electronically controlled camera. 2 to 5 show the appearance of the camera. FIG. 2 is a plan view, FIG. 3 is an enlarged plan view of the LCD panel, and FIG. 4 is a rear view with the back cover open. , FIG. 5 is a bottom view. FIG. 6 is a block diagram showing an outline of the control circuit. 7 to 11 are flowcharts showing the operation of the camera. 15 …… Back cover switch 19 …… Rewind switch 20 …… Main CPU 21 …… DPU 22 …… IPU 23 …… PCU 24 …… Film switch 25 …… Wind completion switch 29 …… Film running motor

Claims (2)

[Scope of utility model registration request] 1. A. A film running motor for running the film, b. A drive unit that has a battery built-in and supplies a drive current to the film traveling motor to wind and rewind the film; c. Voltage check means for checking whether the voltage of the battery is below or above a predetermined value, d. Detection means for detecting film over-end and re-wind end; e. Writing means for storing these data and the check data of the voltage checking means at that time in a rewritable nonvolatile memory when the detecting means detects an over-end or a rewind end; f. Reading the check data from the memory,
An electronically controlled camera, comprising: a data erasing unit that erases the over-end or rewind-end data when the battery voltage at the time point is equal to or lower than a predetermined value. 2. The memory is an E ² PROM (Electron
An erasable programmable read-only memory (electrically erasable programmable read-only memory) which is an electrically erasable programmable read-only memory.