JPH0456932A - E2prom built-in camera - Google Patents

Abstract

PURPOSE:To prevent the malfunction of a camera occurring due to erroneous data from an E<2>PROM by checking whether or not the E<2>PROM is working normally by performing the write and readout of the same data when a power source is loaded. CONSTITUTION:When a power source battery is loaded, a CPU executes routine of RESET. Firstly, the initial reset of a register, etc., is performed, and the version No. of software for operation is written on the E<2>PROM 19 after the initial reset is completed. Thence, the version No. written in from the E<2>PROM 19 is read out, and it is discriminated whether or not the data from the E<2>PROM 19 is correct. When it is incorrect, photographing is prohibited, and when it is correct, it is discriminated whether or not a main switch SM is turned on, and the camera can be started up if the switch SM is turned on. Thereby, it is possible to prevent the malfunction of the camera occurring due to the erroneous data from the E<2>PROM.

Description

[Detailed Description of the Invention] This invention relates to a camera, in particular an E2P system separate from a CPU.
This invention relates to a camera having a ROM.

In recent years, microcomvista (which controls the entire camera) has been introduced.
It is known that the version of the driving software is recorded in the E2PROM in the rCPUJ (rCPUJ).

In addition, in order to prevent the reception of incorrect data from one CPU when the power is turned on, empty data is sent from the other CPU when the power is turned on. It is also known that

Furthermore, Japanese Patent Application Laid-Open No. 60-31122 discloses that when the main power supply is installed and the backup power supply voltage is checked, data is read from the ISO data storage circuit and its contents are checked. There is.

The problem that Akira is trying to solve Regarding the above-mentioned E2PROM built into the CPU, C
There is no problem because the startup characteristics of the PU and E"FROM when the power supply is installed are the same, but if the CPU and the E2PROM are separate units, the E2PROM must be completely started up when the power supply is installed (it is not in a state where it can operate properly). and) E2
The data read and compared from the PROM becomes erroneous data, causing problems such as the camera not operating properly.

Furthermore, in Japanese Patent Application Laid-Open No. 60-31122, data is read from a storage circuit and checked when a backup power supply is installed, but it is only a read and only a check is made to see if writing is being performed normally. It is not intended to be carried out.

In order to achieve the above-mentioned problems, the present invention includes a control circuit that controls the entire camera and stores predetermined data. cE2PRO
In the camera equipped with M, when the power supply is attached, the control circuit includes a writing means for writing the data into the E2PROM, a reading means for reading the data written in the E2PROM, and a reading means for reading out the data written in the E2PROM, and a means for reading out the data written in the E2PROM. and a determining means for determining whether or not the data matches the written data.

According to this configuration, since it is checked whether the E2PROM is in a normal operating state when the power supply is attached by writing and reading the same data, it is possible to prevent erroneous data from the E2PROM. This can prevent camera malfunctions due to

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, embodiments of the present invention will be described based on the drawings.

FIGS. 1 and 2 are views of the camera according to the present invention viewed from the front left and rear left, respectively, as seen from the photographer's perspective.

In Figure 1, (1>) is the grip part that is considered to be held at all times when taking pictures, except in special cases.Grip part (
1) is provided with a grip switch button (2) for detecting that the photographer is holding the grip part. (3) in the figure is provided on the top of the grip part (1).
Press the release button one step to lock the distance measurement and light metering values, and press the second step to start the exposure operation. (4) is a main switch for starting the camera, and (5) is a flash section.

In Fig. 2, (6) is a finder, (7) is a light emitting element such as an LED for detecting eye contact, and (8) is an SP for receiving light emitted by the light emitting element (7).
FIG. 3 is a block diagram showing a specific configuration of the present invention. In FIG. 3, a CPU (microcomputer) (10) controls the entire camera of the present invention, and also performs APZ calculations, and a distance measuring unit (11).
) calculates the subject distance and sends the data to the CPU.
Output to (to). The focal length variable section (12) is a CPU
Focal length f of the APZ calculation result calculated in (10)
Drive the zoom lens motor so that A focal length detection section (13) detects the current focal length using a code board or the like when the focal length variable section (12) is changing the focal length, and outputs the value to the CPU (10). . The flash (14) has a capacitor for light emission inside, charges the capacitor in response to a charging signal from the CPU (10), and outputs a charging completion signal to the CPU (10). The photometry section (15) measures the subject moderation and outputs the data to the CPU (10). Exposure control section (16
) performs the release operation and film winding based on control signals from the CPU (10).The eyepiece detection unit (17) detects the light emitted from the light emitting element (7) shown in Fig. 2 and the light emitted from the light emitting element (7). and a light-receiving element (8) that detects the reflected light. The eye proximity detection unit (17) detects the light emitted from the light emitting element (7) when the photographer looks through the finder (6), and detects the light emitted from the light receiving element (8) at a reflected light level within a predetermined range. ) is configured to be detected by The timer unit (18) is an APO (Au t ) that stops the operation of the camera when a predetermined period of time has elapsed since a predetermined switch (operation) was no longer operated.

This is for the Power 0ff) function.

In addition, (19) is version N of the camera operation software.
This is an E''PROM in which O0 etc. are recorded.

Next, the switches will be explained. Main switch (S
M) is a switch for starting the camera.

The grip switch (SG) is a switch that turns ON when the grip switch (2> shown in Figure 1 is pressed) and detects when the photographer grips the grip and starts shooting.The lock switch (Sl) detects the distance measurement value. , locks the photometric value and photographing magnification.The lock switch (Sl) is turned on by pressing down the release button (3) one step shown in FIG. 3) The ONL and release operations are performed by pressing down two steps.The flash emission switch (SF) is a switch that is turned on when performing flash photography.

In addition, when the CPU is equipped with a power supply, a timer,
Reset terminal (RES) for resetting registers, etc.
) is provided.

Next, the processing performed within the CPU (10) in FIG. 1 will be explained based on the flowcharts in FIGS. 4 to 9.

When the power supply battery is installed, the CPU (10) executes the routine rRESET'J shown in FIG. First, perform initial reset of timers, registers, etc. in step (#1). Once the initial reset is completed, proceed to step (#2).
Insert the operating software version number into the E2PROM.
0 to write 1 Next, in step (I3) E2P
Read the version number written in step (#2) from ROM (19), and read E2 in step (#4).
Determine whether the data from pRoM (19) is correct. If the data is incorrect, photography will not be allowed. If the data is correct, it is determined in step (#5) whether the main switch (SM) is ON or not, and the switch (SM)
) turns ON, the camera is activated and the rMA I shown in Figure 5 is turned on.
Move to NJ routine.

The rMA I NJ routine in FIG. 5 will be explained.

First, in step (#6), the grip switch (SG
) is ON. Wait for the switch (SG) to turn on and then perform rA in step (#7), which will be described later.
Move to the PZJ subroutine. In step (#8), it is determined whether the switch (Sll) is ON or not, and the switch (
SL) is OFF, the above steps (#6) to (#7
), and when the switch (Sl) is turned on, the process moves to the rsI ONJ subroutine of step (#9), which will be described later. After the rsl ONJ subroutine, in step (#10), the main switch (
It is determined whether SM) is ON or not, and if it is OFF, the photographing operation is ended. If the switch (SM) is ON, step (
In step #11), a predetermined value T1 is set in timer 1, and it is started.In step #12, it is determined whether or not timer 1 has counted up. This timer 1 is the APO timer described earlier. If the timer l has not counted up, return to step (#6) and repeat the above operation.If the timer has counted up, the display etc. will be turned off and the unit will be in standby mode until the switch (SG) or switch (Sl) is turned on again. .

Next, the subroutine of rAPZJ will be explained with reference to the flowchart shown in FIG. When the grip switch (SG) is pressed and the routine shifts to this routine, step (#1
In step (3), the register C0UNT in the CPU (10) used for eye proximity detection is reset to 0, and in step (4)
At t14), timer 2 is started. This timer 2
is set so that an interrupt occurs every predetermined time, and tζ
When a predetermined time has elapsed by the timer, the CPU executes the rlNTJ routine shown in FIG. 7 as an interrupt process. 7th
In the figure, the grip switch (
SG) is ON or not, and if it is OFF, that is, the photographer is not holding the grip (in most cases, there is no intention to photograph), the process moves to step (#42), and register C0UNT = 0. Return as. Note that the same determination is made in step (#6) and step (41t41), but this is because it is not possible to release the grip part (1) or only release the grip switch button (2) between the steps. Because there is. If the switch (SG) is ON (that is, when you are about to take a picture), the process moves to step (#43) and the light emitting element (for example, LED) provided near the viewfinder (6) in Fig. 2 is activated.
The zero light emitting element (7) that emits light emits light in a pulsed manner to save power consumption. Then, the reflected light is SP
The light is received by the light receiving element (8) such as C, and the step (#44
), it is determined whether the reflected light level is equal to or higher than a predetermined value. Here, the predetermined value is the value of the reflected light level when the distance between the finder (6) and the photographer (mainly the photographer's eyes) is several mm (for example, 5 mm), and if it is greater than this predetermined value, This is a reference value that determines that the photographer is looking through the finder (6), and if it is less than a predetermined value, it is determined that the photographer is not looking through the finder (6).

If the reflected light level is above a predetermined value, step (#4
5) and set the contents of register C0UNT to C0UNT.
+ Set to 1 (COUNT=COUNT+1) First, it is determined whether the contents of the register C0UNT obtained in step (#45) are 2 or more. If C0UNT≧2, the process returns in step (#47) with C0UNT=2, and if C0UNT<2, the process returns with the contents of the register C0UNT obtained in step (#45) unchanged. That is, when a photographer holds the grip shown in Figure 1 to perform a photographing operation and looks into the viewfinder (6) shown in Figure 2, the register C0UNT is set from step (#13) in Figure 6.
Since the content of is 0, step 1 is executed even if the reflected light level caused by the light emission of the first light emitting element (7) is higher than the predetermined value.
45), the 0th order timer interrupt exits the INT routine (eyepiece detection routine) with C0UNT = 1, and if the reflected light level remains above the predetermined value even after the light emitting element (7) emits light, C0UNT = 2. Then, the process moves to the APZ operation according to the determination in step ($14) in FIG. In this way, not transitioning to APZ operation by detecting the level of reflected light from the light emitted by the first light emitting element (7) is a measure to prevent noise, and also prevents the zoom operation from starting during framing. It's for a reason. If the reflected light level is less than the predetermined value in step (#44), the process moves to step (#48), and the register C0U
Set the contents of NT to C0UNT-1 (COUNT=CO
UNT-1), then in step (#49) it is determined whether the contents of the register C0UNT obtained in step (#48) is less than or equal to 0, and if it is less than or equal to 0, the process is executed in step (#49).
50), set C0UNT=O, and if it is thicker than 0, calculate it in step (#48) and return with the contents of register C0UNT.1st Next, in this step (#44)
(148) (#49) The processing of (#:50) will be explained based on an actual photographing operation. Before shooting, when you are not looking through the viewfinder (6), the contents of register C0UNT are 0, so APZ will not start, but APZ will not start.
If the eye is moved away from the finder (6) during the Z operation, the reflected light level will be determined to be below a predetermined value in step (#44).

However, even if the reflected light level is below a predetermined value, the AP
The operation of Z does not stop, and the reflected light level due to light emission from the next light emitting element (7) also falls below the predetermined value, and APZ is activated for the first time.
stop working. These steps (#45) to (#4
As in case 7), this is for noise countermeasures.

Returning to the flowchart in Figure 6, step (#15)
It is determined whether the contents of register C0UNT are 2 or not. Wait until C0UNT=2 (that is, it is determined that you are looking into the finder (6)) and proceed to step (#16).
to move to. In step (#16), the timer 3 is reset and started (time 1 = 0). This timer 3 and the above-mentioned timer 2 are both built-in units of the CPU. 11) and - Photometering section (15>) performs known distance measurement and photometry operations. In step (118), focusing is performed, and in step (#19), the subject distance D1 is determined.

Next, timer 3 started in step (, #16)
It is determined in step (#20) whether or not a predetermined period of time (0.5 seconds in this embodiment) has elapsed since the counting operation. If it is within 0.5 seconds, move to step (#17) and repeat steps (#17) to (#19),
When 0.5 seconds have elapsed, it is determined in step (#21) whether or not the next predetermined time (1 second in this embodiment) has elapsed. That is, if one second has not elapsed (0,5≦t<1), it is determined in step #22) whether the change in the subject distance D□ is within a predetermined value. If it is not within the predetermined value, it is determined that the photographer is in the process of deciding on the subject (composition), moves to step (#17), and repeats steps (#17) to (#21). If the change in distance DT is within a predetermined value and it is determined that the subject (composition) has been decided, or if the count operation of timer 3 exceeds 1 second in step (#21), step (#2
3) Starting subsequent zoom operations To summarize the operations related to timer 3 above, zoom operations are prohibited within 0.5 seconds after eye contact is detected.

For 0.5 to 1 second, the zoom operation is performed only when the subject distance DT is stable, and for 1 second or more, the zoom operation is performed regardless of the subject distance DT. Note that the reason why the timer 3 is operated in steps ($16) to (#22) is to prevent the zoom operation from being started during framing and to take measures against noise.

When moving to zoom operation, first, in step (#23), the subject distance D□ and AP obtained in step (118) are
A focal length f□ corresponding to a predetermined imaging magnification β1 determined by the Z program line is calculated.

When fl is determined, it is determined in step (#24) whether or not it is C0UNTO. If C0UNT=0, that is, if it is determined that the photographer is not looking into the finder (6), then if zooming is in progress, the zoom operation is stopped and the process returns.

If C0UNT≠0, it is determined in step (#26) whether the main switch (SM) is ON or not, and if the main switch is OFF, the process moves to step (#27), and if it is zooming, it is zoomed. The reason why it is determined whether C0UNT=0 or not in step (#24) where the operation is stopped and returned is as follows. That is, after exiting the rlNTJ routine in FIG.
Even while T=2 and steps (#16) to (, #23) are being executed, C0UNT=
Interruptions at predetermined time intervals following the previous interrupt set to 2 are being performed without stopping. Therefore step (#24
), the C
It is necessary to determine whether 0UNT=O.

Also, when steps (#16) to (#23) are being executed, step (
#44) may be determined to be N (reflected light level less than a predetermined value). C0UNT=2 due to the previous interrupt processing
Therefore, in step (148) C0U
NT = 1, judges N at step (#49HC), and returns with cCOUNT = 1. Through this special sale interrupt processing, steps (#16) to (#2
3) is executed and when step (#24) is reached, step (#24) determines that C0UNT is not =O,
Even if the reflected light level is less than the specified value, the next step (#
26). However, C0UNT1
After returning with the contents of , C0UNT becomes 0 in step (#48) due to subsequent interruptions at predetermined time intervals, and the process returns via step 149) (4t50). Therefore, even if the process has proceeded to step (#24) due to the previous interrupt, step (#39) is executed in order to wait for the switch (Sl) to be turned on.
After returning to step 24), go to step (#24) again.
A determination is made as to whether TCOUNT=0 or not. C0UNT
=O, and as a result, the process returns after passing through step (#25), so no malfunction occurs.

If the switch (SM) is ON, it is determined in step #28) whether the switch (Sl) is ON. If the switch (S l ) is not ON (if it is OFF, the current focus side M t N is determined by the focal length detection unit (13) in FIG. 3, and the focal length f□ determined in step <#23> is
Determine whether it is equal to or not.

If not, the zoom operation is started so that the focal length becomes f ) is QN, the process moves to the rsl ONJ routine described later. Step (
#30) If f N = f 0, step (#32
) to stop zooming.

If fh"fv before the zoom drive, it is assumed that there is no need for the zoom drive and the zoom operation is not performed.

After stopping the zoom operation, the flash (14) is charged in step ($33). Figure 8 shows the flash charging routine. First, in step (#51), the flash light emission switch (SF) is turned on. Determine whether it exists or not. If the switch (SF) is OFF, the battery returns without charging. If the switch (SF) is ON, it is determined in step #52) whether or not the charging capacitor has been fully charged. If charging is complete, it will return immediately. If charging is not completed, a charging timer is started in step (#53).

This charging timer is used to perform so-called intermittent charging, in which charging is performed for a predetermined period (for example, 250 m5). Step after starting the charging timer (#54)
In the step (#55) of starting charging, it is determined whether or not the charging timer has counted up, and when the charging timer counts up, charging is stopped and the process returns.

Returning to Figure 6, repeat the steps (#'34) to ($36) in case the framing (composition) is changed during charging.
) to perform distance measurement, photometry, focusing, and calculation of the subject distance D□ in step (#36).
As a result of calculation 1, it is determined whether the change in subject distance D1 is within a predetermined value compared to the previous subject distance D1, and if it is not within a predetermined value, it is determined that the framing (composition) has been changed (step #23). Return to the above step (#23)
Repeat the operations from ~(#36). If the change in subject distance DT is within a predetermined value, it is assumed that the framing (composition) has not been changed, and a predetermined value T2 is set in APO timer 1 in step (138), and timer 1 is set in step (#39) to start. The operations of steps 124) to (#39) are repeated until it is determined that the timer 1 has counted up. When timer 1 counts up, the data such as distance measurement value and photometry value are cleared and C01JNT = 0, that is, the photographer Wait until you take your eyes off the viewfinder and move on to the MEIN routine.

As described above, in this embodiment, when the APZ is operating, the flash is charged while the framing (composition) is fixed after the completion of the zoom operation, so even if charging is not completed, the flash can be charged by switching ( S1), (S2> is pressed and the exposure operation is started, and the time until the exposure operation (so-called uncharged lock time) is shortened by the amount charged during 6 frames.

Furthermore, by operating timer 1 for APO during APZ operation, if zoom drive is not required during APZ operation (when the subject is fixed), APZ operation can be stopped after a predetermined period of time. This eliminates unnecessary distance measurement operations and prevents unnecessary power consumption.

On the other hand, during the APO of this APZ, the eye proximity detection operation continues, and once the photographer takes his eyes off the finder, he looks through the finder again (and the shooting operation resumes).

Next, the rs2 ONJ routine when the switch (Sl) is turned on will be explained with reference to FIG. first,
In step ($62), it is determined whether the contents of register C0UNT are 0 or not.

C0UNT≠O1, that is, if the photographer is looking through the finder, the current focal length f is determined in step (#63).
, to detect. The current focal path HE r s is a step (
It is determined in step (#64) whether or not the focal length is equal to the focal length f'r obtained in step #23), and if f is not equal to f□, a rhythm operation is started so that the focal length becomes f□. Alternatively, the switch (Sl) may be turned off during zoom operation.
If N is selected, the zoom operation continues until the focal length reaches fN.

When fH=f□, the zoom operation is stopped in step (#66) and the process moves to step (4t67).

On the other hand, in step (, #62) C0UNTO
If so, stop the zoom operation at the current focal length,
The process moves to step (#67). Step ('$67)
Now, perform distance measurement and photometry for the tcth time for confirmation, and proceed to step (1).
Focusing is performed again in step 68).

Next, in step (#69) the exposure control switch (
It is determined whether or not S2) is ON. Switch (S2
) is ON, exposure control is performed in step (#74), the film is wound up in step (#75), and the process returns. If the switch (S2) is OFF, step (
In #70), it is determined whether the switch (Sl) is ON or not, and if it is OFF, the process returns. If the switch (Sl) remains ON, it is determined in step (#71) whether the main switch (SM) is ON. switch(
SM) is OFF, the photographing operation ends.

If the switch (SM) remains ON, step (4t)
72), the timer 1 is set to a predetermined value T3 and started. Next, in step (#74), it is determined whether or not timer 1 has counted up, and if it is in the counting operation, the process moves to step (#69), and the above step ($
69) to step (#75) are repeated. When the timer 1 counts up, it becomes a standby state and waits for the switch (Sl) to be turned on again.

As described above, in this embodiment, the APO timer is operated even when the switch (Sl) is turned on, so that wasteful power consumption due to long-term focus lock can be prevented.

FIG. 1O is a flowchart for switching between giving priority to APz operation and charging the flash photography device.

First, a predetermined value T2 is sent to the APO timer 1 and started. This is to ensure that the APZ operation is performed only within a predetermined period of time and to prevent unnecessary power consumption. Next, as in the case of Figure 6, the photographer looks through the viewfinder and
When T=2, photometry is performed in step (#84), and it is determined in step (#85) whether or not the photometry results in low luminance. If the brightness is not low, the process moves to step (#89). If the brightness is low, it is determined in step (#86) whether the flash light emission switch (SF) is ON.

If the switch (SF) is not ON, the flash light emission is not performed and the process moves to step (#89). If the switch (SF) is ON, it is determined in step 187) whether the charge of the capacitor for flash emission has reached the voltage that allows light emission, and if the voltage that allows light emission has been reached, the process moves to step (#89). If the voltage that enables one light emission has not been reached, charging is started in step (#88), and the process returns to step (#84). When the brightness is no longer low during charging, the switch (SF) is turned off, or the charging voltage reaches a voltage that allows light emission, the process moves to step (#89).

In step (#89), charging is stopped if charging is in progress, and in step 190), timer 3 is reset and started.6 Next, in step (#91), distance measurement operation is performed, and the following steps (#92) to ( #106) performs the same operation as step (#I8) to step ($32) in Figure 6. In step 1106), after the APZ operation is completed, photometry is performed again to determine low brightness and switch (SF). Perform (Step (#107) ~ Step (#10)
9)), proceed to step (#112) Next, in step (#110) it is determined whether or not charging of the flash is completed, and if charging is not completed, proceed to step (#112).
In step #111), determine whether the charge level has reached the voltage that allows light emission.6 If the voltage that allows light emission has not been reached, return to step (#84); if the voltage that allows light emission has been reached, proceed to step (#112). Start charging until the charging is completed.

After charging is stopped in step (#113), a distance measuring operation is performed in step (#114).The following steps are the same as step 135) in FIG. 6, so a description thereof will be omitted.

In the case of Figure 10 above, if flash emission is required,
First, priority is given to charging up to a voltage that allows light emission. However, while charging 6
It measures the light and stops charging when the flash is no longer needed. In other words, since the voltage that enables light emission is secured first and the APZ operation is performed, the 6 uncharged lock will not be activated when the release button is pressed, and the battery will be charged to the fully charged level when the zoom operation is not performed. .

FIG. 11 and FIG. 12 are a flow chart and a time chart for performing eye contact detection with higher accuracy. In the explanation with reference to FIGS. 6 and 7, the timing of eye proximity detection is performed at regular intervals by the timer 2, but in FIG. 11, the light emission interval is shortened if the reflected light level is above a predetermined value.

FIG. 11 will be explained based on actual operation.

First, if the photographer does not hold the grip switch (SG), set it to C0UNTO in step (#122),
In step (#123), the light emitting element 7) is reset to emit light at intervals of time t1, and the process returns.

If the switch (SG) is ON, step (#124)
Step (#12) in which the light emitting element (7) emits light.
If the light reception level (reflected light level) by the light receiving element 8) is equal to or higher than the predetermined value in step 5), the contents of the register C0UNT are set to C0UNT11 in step (#126), and the process is performed in step (#126).
127), it is determined whether C0UNT≧4.

In step (#46) of FIG. 7, it is determined whether or not C0UNT≧'2, and if the reflected light level is twice a predetermined value or higher, the APZ operation is started; however, in FIG.
If the number of times exceeds a predetermined value, the system shifts to APZ operation.

If C0UNT≧4 in step (#127), it is determined in step (#134) whether or not C0UNT22.If it is detected that the 0 reflected light level is equal to or higher than a predetermined value, C0UNT=1. Step (#13)
6). In step (#136), timer 2
The interrupt timing due to time t3 (t l > t
3) and return. After t3 has elapsed, an interrupt is generated again, and this time too, if the reflected light level is above the predetermined level, C0LINT=2 and step (#1) is executed based on the determination in step (#127) and step (#134).
35). In step (#135), a timer 20 hours is set to tz (t, <t2<t3).

The reason why the interrupt timing by timer 2 is switched to three stages as described above is as follows. If the photographer is holding the grip and not looking through the viewfinder, or if the photographer is holding the grip but not looking through the viewfinder, the camera will fire at relatively long flash intervals (tl) to reduce power consumption. Once a reflected light of a predetermined value or more is received, the emission interval is shortened to prevent noise (ti+>, noise in this case is noise inside the camera, noise from the fluorescent lamp, etc. Fluorescent lamp. Since the lamp is lit at 50Hz or 60Hz, time t3 is set to be shorter than the frequency (period) of the fluorescent lamp, and after 0 time t3 passes, an interrupt occurs and the reflected light exceeding the predetermined value is received again. In this case, the light emission interval is switched to t2, assuming that the noise is not caused by the above noise.

Returning to FIG. 11, when reflected light of a predetermined value or more is received four times in a row, C0UNT=4 in step (#126), and the process moves to step (#128) based on the determination in step (#127). In step (#128), C0UNT is set to 4, and in step (#129) it is determined whether the ocular flag is 1 or not. Since the flag is set to 0 at the time of the first eye proximity detection, the process moves to step (@130) and the flag is set to 1. After that, in step (#131), set the timer 2 time to 12 and return.Since the flag is 1- at the time of the first detection, step (#129)
), the process moves to step ($132), sets the flag to 0, sets timer 2 to t3, and returns.

On the other hand, when it is determined in step (#125) that the reflected light is less than the predetermined level, register C0 is set as in FIG.
Let the content of UNT be C0UNT-1, and the result is C0UN
It is determined whether T≦2. If C0UNT≦2, t is set in timer 2 in step (#141) and the process returns. If C0UNT≦2, step (#1
39) to C0UNTO, and then step (#14)
0), resets timer 2 to t, and returns.

As shown in FIG. 12, the light emitting element (7) emits light at intervals of t1 until the reflected light reaches a predetermined level or higher, and once the reflected light of a predetermined level or higher is received, the light emits at intervals of t3 and 12 alternately. As a result, if the reflected light level is equal to or higher than a predetermined value four times in a row, it is determined that the photographer is definitely looking through the finder and the APZ operation shifts. During the APZ operation and shooting operation, the light emitting element 7) emits light alternately at intervals of tl and t2, and if reflected light exceeding a predetermined value is not received twice in a row, the photographer takes his eyes off the viewfinder. APZ
Stop operation.

In addition, in Fig. 11, the APZ operation is stopped if the reflected light exceeding the predetermined value is not received twice in a row, but even if the APZ operation is stopped after making the determination four times as in the case of starting the APZ. good.

As explained above, according to the present invention, when the power supply is installed,
When checking whether the 2PROM is in a normal operating state, the same data is written and read, so the E2
It is also possible to check whether data has been correctly written to the PROM, thereby preventing camera malfunctions due to erroneous data from the E2PROM.

1 omote express day

[Brief explanation of drawings]

Fig. 1 is an external perspective view of the camera according to the present invention viewed from the front left; Fig. 2 is an external perspective view of the camera according to the present invention viewed from the left rear; A block diagram showing the main parts of the example, FIG. 4 is a CPL in an embodiment of the present invention.
7 is a flowchart showing the operation of eye proximity detection, FIG. 8 is a flowchart showing the charging operation of the flash photography device according to the present invention, and FIG. 10 is a flowchart showing another embodiment of the APZ operation in the embodiment of the present invention. FIG. 11 is a flowchart showing another embodiment of the eye proximity detection operation. FIG. 12 is a flowchart showing another embodiment of the eye proximity detection operation. This is a time chart. (1)---Grip part<2)---Grip switch button (3)-m-Release button (4)-m-Main switch (lO) (SM)- (SG)- (Sl)- (S2 )- (SF)- Flash (6)---Finder light emitting element
(8) ---One light receiving element CPU' (11
) - 11 Distance measurement section Focal length variable section Focal length detection section Photometry section (16) - m - Exposure control section Eyepiece detection section (1B) - 11 Time measurement section 2PROM Main switch - Grip switch Lock switch Exposure control switch Flash Light emitting switch! s7 Figure 2

Claims (1)

[Scope of Claims] A camera comprising a control circuit that controls the entire camera and an E^2PROM that stores predetermined data, wherein the control circuit writes the data to the E^2PROM when a power supply is installed. a reading means for reading the data written in the E^2PROM; and a determining means for determining whether the read data matches the written data. A camera with a built-in E^2PROM.