JP3290748B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention relates to a camera, mosquito <br/> is relates ra which particularly has a storage means for holding data of the data projection.

[0002]

2. Description of the Related Art Conventionally, as a camera having an imprinting device, there is an in-roll in-camera as disclosed in, for example, Japanese Patent Application Laid-Open No. 60-166937. This camera measures the speed during winding, calculates the data printing interval, and controls the blinking of the light emitting unit.

[0003] Also, Japanese Patent Application Laid-Open No. 2-44329 discloses that
There is disclosed a technique in which imprinting is prohibited at the time of resetting, for example, when a battery is replaced, and imprinting is permitted in a date data correction mode.

[0004]

However, in the camera disclosed in Japanese Patent Application Laid-Open No. SHO 60-166937, when the date is broken after the battery is replaced or when the reset is applied, It was necessary to reset the initialized date.

[0005] In a conventional module, a power-on reset is performed, for example, by setting the default value to “00:00 on January 1, 1987
In this mode, the date and time are set to the initial value and the mode is set to the imprint prohibition mode if a reset is applied. The camera of the publication does not mention default values.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and reduces the time and effort required to set the date and time data to be initialized to the latest date and time data as much as possible. ignored if the deviation of time for the purpose of camera that can be used as it is.

[0007]

That is, according to the present invention, a nonvolatile memory, a power supply voltage detecting means for detecting a power supply voltage of a camera, and a voltage detected by the power supply voltage detecting means are predetermined. If the voltage is lower than the specified voltage , date imprint is prohibited with the date imprint date data at that time.
Writing means for writing the write- inhibit data instructing the non-volatile memory to the nonvolatile memory, and responding to the reset operation of the camera operation.
The date imprinted on the nonvolatile memory
Initializing the camera using data and write-protect data
Terminating means .

[0008]

[Action] In the camera of the present invention, shown in Figure 1
As described above, the information is recorded on the recording medium by the recording unit 1. The information recorded by the recording unit 1 is the first information stored in the storage unit 2.
It is held in the storage unit 2 _1. In addition, the level of the power supply voltage is determined by the determination unit 3, and when this level falls below a predetermined value, a warning signal such as a battery check is issued to the second unit in the storage unit 2.
It is output to the storage unit 2 _2. In synchronism with the warning signal, the first holding value of the storage unit 2 ₁ is stored in the second storage unit 2 ₂ composed of nonvolatile memory. Then, when the predetermined sequence executed after the power battery replacement, the second stored value in the storage unit 2 _2, so as to retain the first storage unit 2 _1, it is set by the setting unit 4.

The counting unit 5 counts time, and the count value of the counting unit 5 is stored in the first storage unit 2 _1.
Are stored sequentially. Thereby, the recording is permitted when the photographer performs an operation of changing the recording mode, and since the recording data at that time is the recording data such as the time when the camera was operated recently, the time and effort for correction are small. Alternatively, when the battery is replaced in a short time, the recording data is shifted by only a small amount of time, and it is only necessary to change the recording mode.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 2, 35m of camera of the present invention is applied
FIG. 3 is a schematic block diagram of an m camera.

In FIG. 1, a main microcomputer (M-μCOM; hereinafter abbreviated as M microcomputer) 11
Is for performing sequence control and various calculations of the entire camera system. The M microcomputer 11 includes a display circuit 12, a release switch 13, a setting switch 14, a film sensitivity reading circuit 15, a photometric processing circuit 16, a storage circuit 17, a battery check circuit 18, a date display circuit 19,
A distance measuring circuit 20, an exposure circuit 21, a film control circuit 22, and a lens control circuit 23 are connected via a bus. Further, the M microcomputer 11 is further coupled to an oscillator 24 for generating an operation clock of the M microcomputer 11, a date microcomputer (D-μCOM; hereinafter abbreviated as D microcomputer) 25, and a film movement detection unit 26. .

A power supply 27 for supplying respective drive voltages is connected to the M microcomputer 11 and the D microcomputer 25. Although not shown, a voltage is applied to each circuit of the embodiment by the power supply 27.

Further, a backup capacitor 28 is connected between the power supply 27 and GND. This backup capacitor 28 has a function of t = C even when the power supply 27 is turned off.
The t time represented by V / I guarantees the values of the RAMs (not shown) of the M microcomputer 11 and the D microcomputer 25. C is the capacity, I is the D microcomputer 25 and the M microcomputer 1
The consumption current of 1 and V is the voltage of the backup capacitor 28.

Further, since the RAM in the D microcomputer 25 is equivalent to a capacitor, the time during which the RAM can be held is short, but the RAM can be held without the backup capacitor 28.

The display circuit 12 displays the operation mode of the camera, exposure data, and the number of film frames. The release switch 13 is a two-stage stroke switch. When the first-stage switch is turned on, the distance measurement is executed.
The exposure operation is performed by turning on the switch of the stage. The setting switch 14 is used for setting an operation mode of the camera. Further, the film sensitivity reading circuit 15
Is for reading the DX code of the film and sending the SV value to the M microcomputer 11.

The storage circuit 17 is a non-volatile memory for storing data that needs to be stored even when the power is off, such as the number of frames of a film and the operation mode of the camera. The battery check circuit 18 electrically connects a dummy resistor between the power supply 27 and the ground, converts the power supply voltage after a predetermined time into a signal divided by a divided resistor provided between the power supply 27 and the ground, This is a circuit that reads data at the A / D conversion port of the microcomputer 11 and detects the life of the battery.

The date display circuit 19 displays date data based on data from the D microcomputer 25.
The distance measuring circuit 20 sends data necessary for measuring the distance to the subject to the M microcomputer 11, and the exposure circuit 21
A lens shutter 29 having aperture and shutter functions is controlled based on a control signal from the microcomputer 11.

The film control circuit 22 includes the M microcomputer 11
Automatic winding and rewinding of the film 30 are performed based on the control signal. The lens control circuit 23 drives the taking lens 31 based on a control signal of the M microcomputer 11. Then, a subject image is formed on the film 30.

The film movement detecting section 26 includes a film 30
Is transmitted to the M microcomputer 11 and the D microcomputer 25. The M microcomputer 11
Automatic winding and rewinding are controlled based on the pulse signal.

The D microcomputer 25 is a microcomputer for recording date data on the film 30. The D microcomputer 25 records the date data on the film 30 using the 7-segment LED 32 and the imprint lens 33 based on the control signal of the M microcomputer 11. Recording is performed in synchronization with a pulse signal from the film movement detection unit 26.

The oscillator 34 generates an operation clock for the D microcomputer 25. By counting this clock, the D microcomputer 25 determines “year”, “month”, “day”,
Data for imprinting “hour” and “minute” is created.

The switches 35, 36 and 37 are a mode (MOD) switch, a selector (SEL) switch and an adjust (ADJ) switch, respectively. By operating these three switches, the photographer can select a recording mode and correct recorded data. Since the selected state and the corrected state of the recording mode are displayed on the date display circuit 19, the photographer may operate the three switches 35, 36 and 37 while checking this display.

The operation of the D microcomputer 25 is controlled by four control signal lines CLK, CEN, SCLK, and SDATA. The CLK line is used to transmit a clock from the M microcomputer 11 to the D microcomputer 25.

While the operation of the M microcomputer 11 is stopped, the D microcomputer 25 only needs to perform the counting operation of the clock. Therefore, using the operating clock of the oscillator 34,
Execute the minimum required operation at the minimum required speed. As a result, the current consumption of the system can be minimized. However, during the operation of the M microcomputer 11,
In addition to the counting operation of the clock, it is necessary to perform date recording control on the film 30, control based on a switch operation of the photographer, and the like. Therefore, the processing speed of the operation clock of the oscillator 34 is low.

Therefore, the D microcomputer 25 is connected to the M microcomputer 1
The operation must be performed using the operation clock supplied from 1. Further, by using the clock from the M microcomputer 11 as the operation clock during the high-speed operation, it is not necessary to have two oscillators.

On the CEN line, the M microcomputer 11
It is used to send a communication request signal to the microcomputer 25. In addition, the SCLK and SDATA lines are mutual row signal lines used to send out serial data.

FIG. 3 shows the structure of the film movement detecting section 26 shown in FIG. In the figure, a photointerrupter composed of an infrared light emitting diode 38 and a phototransistor 39 is arranged with the film 30 sandwiched from both sides. The photointerrupter outputs a signal corresponding to the movement of the film 30 due to the movement of the perforation. This signal is shaped into a pulse signal by a waveform shaping circuit 40 and further converted into a doubled pulse signal by a multiplying circuit 41. By counting this pulse signal, the M microcomputer 11 and the D microcomputer 25 can detect the amount of movement of the film 30.

Next, FIGS. 4A and 4B and FIG.
A communication method between the M microcomputer 11 and the D microcomputer 25 will be described based on the time charts (a) and (b).
In the drawing, the direction of data communication in the drawing is, for convenience, that the hatched portion indicates communication from the D microcomputer 25 to the M microcomputer 11 and the other portions indicate communication from the M microcomputer 11 to the D microcomputer 25. I do.

The communication is started when the M microcomputer 11 sets the CEN line from a high level (Hi) to a low level (Lo). Since the communication request is generated only from the M microcomputer 11, the relationship between the M microcomputer 11 and the D microcomputer 25 is that of the master and the slave.

After setting the CEN line to Lo and waiting for a predetermined time, the M microcomputer 11 outputs a control command on SDATA in synchronization with the SCLK signal. The standby time is determined in consideration of the processing speed of the D microcomputer 25. The control command is used by the D microcomputer 25 to identify the communication mode. Therefore, in any communication mode, the control command is located at the head of the communication data.

The communication mode A will be described with reference to FIG. The M microcomputer 11 outputs a code as a control command for the communication mode A as the first data. Next, data including a code indicating the state of the camera is output. Based on the camera state data, the D microcomputer 25 can determine whether the M microcomputer 11 is operating normally or about to enter the standby mode.

When the M microcomputer 11 completes the output of the two data, the D microcomputer 25 outputs the six data necessary for displaying on the date display circuit 19 to the M microcomputer 11. After this data output, a check code is output and the data output ends. The M microcomputer 11 determines that the communication operation has been completed by inputting the check code, and sets the CEN line from Lo to Hi. All communication modes are configured to end when the M microcomputer 11 inputs a check code.

Next, the above six data will be described. The display control data is data indicating a display method on the date display circuit 19. Following the display control data,
Data indicating “year”, “month”, “day”, “hour”, and “minute” are output. The five data indicate the contents of the clock counter that counts the clock reference clock generated inside the D microcomputer 25. The M microcomputer 11 indicates which of the five data is to be displayed on the date display circuit 19 (display mode) by the upper 4 bits of the display control data. Table 1 shows the correspondence between the data and the display mode.

[0034]

[Table 1]

This data also indicates the imprint mode when the D microcomputer 25 imprints date data on the film 30. The display mode changes from “1” to “1” every time the MOD switch 35 connected to the D microcomputer 25 is turned on.
... "5" → "1". However, if (CHECK) RAM = “A5” h is not established when the power is turned on, the display is turned off. In this case, the date display circuit 19 displays the recording prohibition mode as shown in FIG.

Next, the lower 4 bits of data will be described. Which digit of the 6-digit display on the date display circuit 19 should be flashed by the M microcomputer 11 (flashing mode)
, This 4-bit data indicates. Table 2 shows the correspondence between the above data and the blinking mode.

[0037]

[Table 2]

In Table 2, it is assumed that the digit indicated by the hatched portion blinks. This blinking mode is set by the D microcomputer 2
Every time when the SEL switch 36 connected to 5 is turned on,
It is changed in the order of “1” → “2” → “3” → “4” → “1”. However, when the power is turned on, (CHECK) RAM =
If “A5” h is not established, select “5”,
All indications are blinked to notify the photographer of an abnormal state.

The photographer operates the SEL switch 36 to blink a desired digit. Then, the ADJ switch 37 also connected to the D microcomputer 25 is operated.
Then, the D microcomputer 25 changes the content of the time counter corresponding to the blinking digit, and outputs the changed data to the M microcomputer 11. Therefore, the photographer can change the date data while checking on the date display circuit 19.

Next, the communication mode B will be described with reference to FIG. The M microcomputer 11 outputs a code corresponding to the communication mode B as the first data as a control command. Next, the D microcomputer 25 outputs four bytes of control parameters necessary for imprinting date data on the film 30. Table 3 shows the data contents of the control parameters.

[0041]

[Table 3]

The recording time for one digit of the date data (ie, the emission time of the 7-segment LED) is determined by the recording reference time of the control parameter and the film sensitivity coefficient of the upper nibble of the control parameter 2. STDTM × FSK = light emission time.

The measurement start timing of the lower nibble of the control parameter 2 indicates the position where the measurement of the moving speed of the film 30 is started. When the M microcomputer 11 starts the automatic loading of the film 30, the film movement detecting section 26 outputs a pulse signal. The D microcomputer 25 starts measuring the film moving speed from the time when the number of pulse signals indicated by STRTM is input after detecting the first pulse signal. The reason for prohibiting the detection of the moving speed for the STRTM pulse is that the film 3 in the initial state of the autoloading operation
This is because the moving speed of 0 is not stable.

The D microcomputer 25 detects the moving speed of the film 30 by measuring the interval between the pulse signals with a timer. Let the value of this timer be TFV. D microcomputer 25
Starts recording after waiting for the recording delay time of the control parameter 3 after detecting the film moving speed.

Therefore, from the data set by STRTM and TMDLY, where on the film 30 the recording data is recorded is determined. The interval of the recorded numerical values is determined by the recording interval coefficient of the upper nibble of the control parameter 4 and the TFV. That is, TFV × IT
At time intervals determined by VK, date data is recorded digit by digit. The recording format of the control parameter is used to select whether to start recording date data from the lower digit or to start recording from the upper digit. this is,
This is data determined by the position of the 7-segment LED and the moving direction of the film 30.

Next, the communication mode C will be described with reference to FIG. In this C mode, the communication mode C
Is a communication mode in which a code corresponding to the above is controlled by the M microcomputer 11 and output.

Since the communication mode C is a mode which is executed immediately before the M microcomputer 11 winds up the film, the D microcomputer 25 can detect the winding timing by receiving this communication.

Next, the communication mode D will be described with reference to FIG. The M microcomputer 11 outputs a code corresponding to the communication mode D as the first data as a control command. Next, after outputting "empty" data twice,
The data of "year", "month", "day", "hour", and "minute" are output. The D microcomputer 25 receives these data,
The data is developed in the RAM inside the D microcomputer 25. After inputting data, output check code. The M microcomputer 11 determines that the communication operation has been completed by inputting the check code, and ends the communication.

Next, referring to the flowchart of FIG.
The operation of the M microcomputer 11 will be described. First, step S1
Then, after the M microcomputer 11 is reset by turning on the power,
Perform an initialization operation. Next, in step S2, the date and time data and the recording prohibition data stored in the storage circuit 17 in advance are read into the M microcomputer 11. Step S
In step 3, the date and time data are transferred to the D microcomputer 25 via the communication D, and the recording prohibition data is transferred via the communication C. Further, in step S4, the recording prohibition data is cleared and stored in the storage circuit 17.

In step S5, output of an operation clock necessary for the D microcomputer 25 to operate at high speed is started.
Next, in step S6, two timers are set and counting of the timers is started.

One of the two timers is a display timer. This timer is initialized each time the photographer operates the switch of the camera. Then, for a predetermined time (for example, 3
If the timer counter overflows without the operation of the switch during (0 seconds), the M microcomputer 11 is set to the standby mode in order to reduce power consumption. The other timer is a 100 msec timer, and is used as a synchronization signal for periodically inputting date data from the D microcomputer 25.

In step S7, a battery check is performed (this subroutine will be described later). Next, in step S8, it is determined whether the display timer has overflown. When the display timer expires due to overflow, the process proceeds to step S9. This step S9
Then, communication in communication mode A is performed. Here, the state data of the camera indicates that the M microcomputer 11 enters the standby mode.

Next, in step S10, the clock output for operation of the D microcomputer 25 is stopped. Then, in step S11, all the displays are turned off to notify the photographer of the standby mode. Step S1
In step 2, after permitting the interrupt, the M microcomputer 11 enters the standby mode, and the operation stops. The operation may be started by the photographer operating a switch to generate an interrupt signal. When the interrupt signal is generated, the standby mode is released, and the M microcomputer 11 restarts the operation from step S5.

If it is determined in step S8 that the display timer has not overflown, the flow advances from step S8 to step S13. In this step S13, 100
It is determined whether the msec timer has overflowed. Here, when it ends with overflow,
The process proceeds to step S14, and if not completed, proceeds to step S17 described later.

In step S14, communication in communication mode A is performed, and data necessary for date display is stored in the D microcomputer 25.
Enter more. Then, in step S15, display is performed on the date display circuit 19 based on the input data. Further, a display corresponding to the operation mode of the camera is performed on the display circuit 12. Next, in step S16, 100 ms
Initialize the c timer and start counting.

By the operations of steps S13 to S16, the display of the date display circuit 19 and the display circuit 12 is updated in accordance with the operation of the M microcomputer 11 and the operation of the D microcomputer 25.

In the next step S17, the setting switch 1
The state of No. 4 is input, and the operation mode of the camera according to the operation state of the switch is determined in step S18. In step S19, a Bv value, which is the luminance of the subject, is input from the photometry processing circuit 16. Also, a film sensitivity reading circuit 15
Then, the Sv value which is the film sensitivity is input. Then
In step S20, a film exposure time is calculated based on the Bv value and the Sv value.

In step S21, the state of the first-stage switch (1RSW) of the release switch 13 is determined. If 1RSW is on, step S
22 and when it is off, the process proceeds to step S8. In step S22, the display timer is initialized to start counting in order not to enter the standby mode. Next, in step S23, the distance to the subject is calculated based on the data from the distance measurement circuit 20.

Further, in step S24, the state of the second-stage switch (2RSW) of the release switch 13 is determined. If 2RSW is on, step S2
5, if it is off, the process proceeds to step S8. In step 25, a battery check is performed. Next, in step S26, communication in communication mode B is performed. Here, the reason why the data necessary for determining the date recording condition is sent to the D microcomputer 25 is that the D microcomputer 25
This is because preparations necessary for recording can be made during the exposure operation of the microcomputer 11.

Thereafter, in step S27, the taking lens 31 is used by using the lens control circuit 23 in accordance with the subject distance.
Drive. Next, in step S28, the lens shutter 29 is driven using the exposure circuit 21 according to the exposure time. When the exposure is completed, in step S29, communication in communication mode C is performed prior to film winding. In this way, when one frame of film is wound by the film control circuit 22 in step S30, the photographing ends.

Next, referring to the flowchart of FIG.
The operation of the D microcomputer 25 will be described. In step S31, after the D microcomputer 25 is reset when the power is turned on, an initialization operation is performed by a subroutine for initialization. Next, in step S22, the D microcomputer 25 is set to the stop mode. During the stop mode, only the watch timer for counting the oscillator clock and the interrupt function can operate. The clock timer overflows at one second intervals.
This overflow is one of the interrupt signals.

Therefore, date data is created by counting up five clock counters (minute, hour, day, month, year) using the interrupt signal as a reference clock.
Therefore, when an interruption by the clock timer occurs, the time counter is updated by the processing of steps S33 and S34. When the updating of the counter is completed, the process proceeds to step S32, and the stop mode is set.

The M microcomputer 11 periodically communicates with the D microcomputer 25 when it enters the operating state. That is, the CEN line is set from Hi to Lo. This change in the CEN line causes a communication interrupt, and the steps S35 and S35
The process moves to the process of 36. In step S36, processing corresponding to each communication mode is performed. In step S37, a clock supplied from the M microcomputer 11 is used as an operation clock. That is, the processing speed of the D microcomputer 25 is improved.

In the processing of steps S 38, S 39 and S 40, the three switches (M
OD, SEL, ADJ) 35, 36 and 37 are determined. If any switch is operated,
Move to step S41. Then, processing corresponding to each switch is performed. When the MOD switch 35 is operated, the recording mode is changed and the display control data sent to the M microcomputer 11 is changed. The SEL switch 36
Is operated, the mode is set to the correction state of the date data, and the digit to be corrected is selected. Then, the display control data is changed to blink the selected digit. Further, when the ADJ switch 37 is operated,
Modify the contents of the time counter corresponding to the selected digit.

In step S42, it is determined whether or not the clock timer has overflowed. If the timer has overflowed, the process of step S43 is executed to update the clock counter. In step S44, it is determined from the state of the CEN line whether communication has been requested. If the CEN line is Hi, go to step S38, L
If it is o, the process moves to S45.

In step S45, processing corresponding to each communication mode is performed. In step S46, the operation state of the M microcomputer 11 is determined from the code indicating the state of the camera. Here, when the M microcomputer 11 is about to enter the standby mode, the flow shifts to step S47 to stop using the clock supplied from the M microcomputer 11. In this case, the oscillator 34 is used as an operation clock, and the processing speed is reduced to reduce power consumption. On the other hand, if the mode is not the standby mode in step S46, the process proceeds to step S48. When a control parameter is input in the communication mode B, the process proceeds to step S49.

In this step S49, the product of STDTM and FSK included in the control parameter
Calculated for ED light emission time control. This value is assumed to be T on. Next, the value of the counter corresponding to the date data to be imprinted is read from the time counter in accordance with the imprint mode. This value is converted into data for lighting a 7-segment LED. This data is 8-byte data (DATA1 to DATA8) including data other than numbers. FIG. 9 shows an example of data other than numbers. For example, "September 1, 1990
When "5 days" is recorded as shown in the figure, the part indicated by "s" in the figure is also treated as LED lighting data.

Then, in a step S50, it is determined in the communication mode C whether or not the M microcomputer 11 has made a recording request. If there is a request, a subroutine "record" of step S51 is executed.

Next, the subroutine "record" will be described with reference to FIG. In step S61, it is determined whether the mode is the recording prohibition mode. Here, in the case of the prohibition mode, the process returns. When the M microcomputer 11 starts winding the film 30, the film movement detecting unit 26
A pulse signal is output. In step S62, the pulse signal is skipped by a predetermined number (STRTM) before detecting the film speed. Then, in step S63, the timer counter is initialized to detect the film moving speed, and then the counting up is started. Thus, the process waits at step S64 until the next pulse signal is output.

When the pulse signal is detected in step S64, the process proceeds to step S65, where the value of the timer counter is taken in as TFV. The TFV is time data corresponding to the moving speed of the film 30. Next, in step S66, this TFV is multiplied by a coefficient (ITVK),
TINT. TINT determines the interval between numerical values (or symbols) to be recorded.

Next, a standby time is set before turning on the LED. By the processing of steps S67 and S68,
Recording is delayed for a predetermined time (TMDLY). In step S69, data for lighting the 7-segment LED is output from the output port of the D microcomputer 25. As a result, recording for one number is started.

In step S70, after the timer counter is initialized, the count-up is started. Then, during the recording time (T on), the process stands by in step S71. Then, the LED is turned off in step S72, and the recording for one numeral is completed.

Next, in step S73, an interval until the next number is formed by waiting until the timer counter = TINT (to be precise, the timer counter = TI
Although it is NT-T ON, there is no problem because TINT >> T ON). Then, in a step S74, it is determined whether or not the recording of the data of 8 bytes is completed.

By the processes in steps S69 to S74, data from DATA1 to DATA8 are recorded in order. Next, referring to FIG. 11, step S3 in FIG.
The first subroutine "initial setting" will be described.

First, in step S81, (CHEC
K) If _RAM = “A5” h, the flow shifts to step S84 to exit without doing anything. This is because the (CHECK) _RAM which is the check code keeps “A5” h,
The date, time and minute data are also stored in the backup capacitor 28
Is considered to hold the value before the power was turned off.

On the other hand, if (CHECK) _RAM is not "A5" h, the initial value is written because there is a possibility that the data of year, month, day and hour are also broken. More specifically, in step S82, "A5" h is rewritten in the (CHECK) _RAM for the next reset by power-on.

Next, at step S83, (93.1.1) is stored in the (date data) _RAM in the case of the camera released in '93.
1 "data) and (hour / minute data) RAM
Is written as "00:00".

In step S84, the display OFF mode is selected so as not to imprint the initial value data. In step S85, the display is turned on and off completely so that the photographer can recognize the abnormal state. However, since the display is in the display OFF mode, the date display circuit 19 displays the display shown in FIG.
Blinks in the display (no display) shown in (b). If the MOD switch 35 is depressed once by operating the MOD switch 35 from this all-blinking state, the date and time display mode of "2" shown in Table 1 above is set, and step S
The initial value set in step 83 is displayed.

Next, the subroutine "battery check" will be described with reference to FIG. First, in step S91, a dummy resistor in the battery check circuit 18 is turned on to flow a current. Next, step S9
At 2, the power supply voltage drops and stabilizes as a result of the current flowing through the dummy resistor, and waits for about 4 msec. And
In step S93, the signal obtained by dividing the power supply voltage is subjected to A / D conversion to obtain an A / D value. In step S94, the dummy resistor is turned off to stop the current.

In step S95, the A / D value is compared with a judgment value which is a battery lock voltage. Where A / D
If the value is larger, the routine exits. On the other hand, if the battery lock voltage is higher, the process proceeds to step S96, and the recording prohibition data is written to the EEPROM.

Next, in step S97, the date and time data is read from the D microcomputer 25 via the communication A. Then, in step S98, the data read in step S97 is stored in the storage circuit 17.

As described above, in the case where the photographer attempts to correct the data when the battery is replaced by knowing the camera battery replacement time, the data before the battery replacement is used as the initial data. Therefore, there is an advantage that the time and effort for correction can be reduced, or the time and effort for correction can be saved only by delaying data by the time required for battery replacement.

[0083]

As described above, according to the present invention, it is possible to reduce the trouble when setting the date and time data to be initialized to the latest date and time data as much as possible, or to shorten the time when replacing the battery. it can be ignored if the shift to provide a camera that it can be used.

[Brief description of the drawings]

1 is a block diagram showing the concept of the camera of the present invention.

2 is a schematic block diagram of a 35mm camera camera of the present invention is applied.

FIG. 3 is a diagram illustrating a configuration of a film movement detection unit in FIG. 2;

FIG. 4 illustrates a communication method between the main microcomputer and the date microcomputer.
(A) is a time chart of the communication mode A, and (b) is a time chart of the communication mode B.

FIG. 5 explains a communication method between the main microcomputer and the date microcomputer.
(A) is a time chart of the communication mode C, and (b) is a time chart of the communication mode D.

FIGS. 6A and 6B show display examples of a date display circuit, in which FIG. 6A is a diagram showing a recording prohibition mode, and FIG.

FIG. 7 is a flowchart illustrating an operation of a main microcomputer.

FIG. 8 is a flowchart illustrating the operation of the date microcomputer.

FIG. 9 is a view showing an example of data other than a number, which is lit by a 7-segment LED.

FIG. 10 is a subroutine for explaining the imprinting operation.

FIG. 11 is a subroutine for explaining an initial setting operation.

FIG. 12 is a subroutine for explaining an operation of a battery check.

[Explanation of symbols]

1 ... recording unit, 2 ... storage unit, 2 ₁ ... first storage unit, 2 ₂ ... second storage unit, 3 ... determining unit, 4 ... setting unit, 5 ... counting unit,
11: Main microcomputer (M microcomputer), 1
2 display circuit, 13 release switch, 14 setting switch, 15 film sensitivity reading circuit, 16 photometric processing circuit, 17 storage circuit, 18 battery check circuit, 19 date display circuit, 20 distance measuring circuit , 21 exposure circuit, 22 film control circuit, 23 lens control circuit, 24, 34 oscillator, 25 date microcomputer (D microcomputer), 26 film movement detection unit, 2
7 power supply, 28 backup capacitor, 29 lens shutter, 30 film, 31 photographing lens, 32
... 7-segment LED, 33 ... imprint lens, 35
... Mode (MOD) switch, 36 ... Selector (SE)
L) switch, 37 ... Adjust (ADJ) switch.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenichi Kishida 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside the Olympus Optical Co., Ltd. (72) Inventor Jun Maruyama 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Yasuo Tanhara 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (56) References JP-A-63-115153 (JP, A) JP-A-57-67922 (JP, A) JP-A-6-250278 (JP, A) JP-A-3-223835 (JP, A) JP-A-3-206436 (JP, A) JP-A-2-44329 (JP, A) JP-A-6-289477 (JP, A) JP-A-6-258709 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 17/24

Claims (1)

(57) [Claims] And 1. A non-volatile memory, a power supply voltage detecting means for detecting a power supply voltage of the camera, is lower than the voltage which the voltage detected by the supply voltage detecting means is predetermined in at that time Dating copy
Instructs to prohibit date imprinting along with imprint date data
Writing means for writing write- inhibited data into the nonvolatile memory; and the nonvolatile memory in response to a reset operation of the camera operation.
Date imprint date data written in the file and record prohibition
Initialization means for initializing the camera using the data .