JP2749286B2 - Auto focus camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to driving of a photographic lens of an autofocus camera.

[0002]

2. Description of the Related Art In an autofocus camera, a motor drives a lens to perform an autofocus operation. Here, if any abnormality occurs during driving of the lens such as during an autofocus operation and the lens stops halfway, specific abnormal processing is performed to return the lens to a predetermined position. An example of this abnormal processing is disclosed in JP-A-62-17.
No. 5721.

[0003] However, this conventional technique has an abnormal stop state.
It is stated that there is a storage in volatile memory
Connected to external devices for failure analysis, etc.
There is no mention of conducting inspections.

As described above, the conventional auto-focus camera detects the abnormal state of the lens drive, and
Stop driving. In this state, external devices for failure analysis
Even if an inspection is performed by connecting to the
Communication with external devices.
No accurate failure analysis could be performed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to be able to store an abnormal state of lens driving even when the power is turned off, and to perform an abnormal processing operation. it possible to communicate with an external device among,
An object of the present invention is to provide an autofocus camera capable of performing accurate failure analysis .

[0006]

According to the present invention, there is provided an autofocus camera, comprising: means for detecting a focus adjustment amount of a photographic lens; means for driving the photographic lens based on the focus adjustment amount; and driving of the photographic lens. and abnormality determining means for determining an abnormality when a pulse generating means for generating a pulse, in which the pulse has not occurred a predetermined time in association with, turtle
Electricity that retains its memory state even when the power to the
Manner is composed of rewritable nonvolatile memory element, and storing means for storing the abnormal state on the basis of the abnormality determination, when it is determined that the abnormal state by the abnormality determination means, the
Stop the driving by the driving means and communicate with the external device.
Error processing means for making communication possible.
You.

[0007]

According to the autofocus camera of the present invention, the abnormal state of the lens drive can be electrically detected even when the power is cut off.
Stored in a rewritable nonvolatile memory element, and
Communicates with external devices even during abnormal processing operation after re-input
Can be performed, and the non-volatile memory
Check whether the abnormal condition is stored in the child.
With this knowledge, failure analysis can be performed easily.
You.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an autofocus camera according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing one embodiment. An external device 2 is detachably connected to a camera 1 having a CPU 10 composed of a one-chip microcomputer. CPU 10 is camera 1
As a subroutine. The camera 1 has an external (EXT) terminal 3, and the camera 1 and the external device 2 are connected via the EXT terminal 3. Thereby, the camera CPU 10 and the external device CP
Communication with U4 becomes possible.

The external device 2 has an operation switch 5 and a display unit 6 in addition to the CPU 4. Examples of the external device 2 include an adjustment device for a camera before shipment and an optional adapter device for enabling special shooting.

FIG. 2 shows the connection between the camera CPU 10 and the external device 2. The CHECK1 terminal of the camera CPU 10 is normally at "H" level, and the external device 2 sets the CHECK1 terminal to "L" level before communicating with the camera. Therefore, the CPU 10 can determine whether the external device 2 has issued a communication request by detecting the level of the CHECK1 terminal.

A clock CLK for communication is generated from the camera 1, and the external device 2 transmits communication contents (coded data) to the CPU 10 via the data line DATA in synchronization with the clock CLK. This data line D
ATA is a bidirectional serial communication line.

FIG. 3 shows the details of the camera 1. CPU10
Controls the operation of the entire camera, the basic clock is supplied from the oscillation circuit 20, and the operation is started by a reset from the reset circuit 22. When the battery is inserted, the reset circuit 22
And operates when a power switch (not shown) is turned on / off.

The E ² -PROM 24 stores the number of frames, camera status data (winding, rewinding, etc.), abnormal data (fault location), adjustment data (shutter control correction data, autofocus correction data, battery check data, etc.). Is a non-volatile memory that stores data for each. Therefore, even if the battery is removed once for replacement, these data are valid. In addition, E ² -PROM24
The reset operation of the reset circuit 22 is prohibited while data is being written to the memory.

When the E ² -PROM 24 is set to the read mode, the DX code is first input from the DX terminal 26 and is input to the CPU 10 via the serial line 28. Then, data of the E ² -PROM24 is transferred to the CPU 10.

The AF sensor (AFIC) 30 is, for example, a phase difference sensor, and supplies distance data to the CPU 10. The CPU 10 turns on the auxiliary light source 32 in accordance with the operation of the AFIC 30 when the photometric value is darker than a certain value.

E ² -PROM 24, EXT terminal 3, AF
The IC 30 is connected to the same serial line 28 in order to use the input / output port of the CPU 10 effectively.
Data exchange with 0 is performed by serial communication.

The operation switch group 34 includes various operation switches of the camera, and includes a release switch, a mode switch, and the like. The LED group 36 is the LE in the viewfinder.
D, which includes LEDs for strobe light emission notice, focus indication, and the like. The LCD 38 is an LCD on the surface of the camera, and displays the number of frames, the camera mode, and the like.

An interface (IFIC) 40 transmits and receives signals to and from the motor driver 50 and the photometric unit 42.
The power supply to the CD 38, the charging of the strobe 64, the battery check, and the like are performed. Note that the power supply is not shown in FIG. Also, interface 4
0 is a shutter motor (M
s) 44, a winding motor (Mw) 46, and a zoom function (Mz) 48 for selecting a decode function. The decoding function is provided by the photometric unit 4
2 includes switching between average photometry and spot photometry. These motors 44, 46, 48 are driven via a motor driver 50 by a decode signal of the interface 40.

The shutter motor 44 drives a lens for automatic focusing during normal rotation, and performs shutter driving during reverse rotation. Here, it is assumed that a lens shutter is employed as the shutter.

[0020] when the auto-focusing, the distance data and the E CPU10 was determined by the AFIC30 ² -PROM24
To the target position obtained by calculating the adjustment data of
Is rotated forward to drive the focusing lens. here,
The reset position of the focusing lens is set with a switch (AF
s) The confirmation is made in the ON state of 52, and the lens position is confirmed by the number of pulses of the photo interrupter (PIs) 54 generated for one pulse per unit movement amount of the focusing lens.

That is, the CPU 10 refers to the output of the photo interrupter (PIs) 54 and
Controls braking and off, and stops the focusing lens at the target position.

The reset position of the motor 44 during the shutter control is confirmed by turning on the switch (AEs) 56.
By controlling the duty drive ratio in accordance with the adjustment data of the ^2- PROM 24, control is performed so that a constant aperture waveform is maintained.

The winding motor 46 winds the film at the time of forward rotation and rewinds the film at the time of reverse rotation. One frame winding control of the film is performed by counting the number of pulses of the photo interrupter (PIw) 58.

The photo interrupters 54 and 58 are turned on only when the shutter motor 44 and the hoist motor 46 are selected, respectively. The outputs of the photo interrupters 54 and 58 are input to the CPU 10 after digitally removing noise through the IFIC 40. You. This is because if the outputs of the photo interrupters 54 and 58 are directly input to the CPU 10, an error may occur in the count value due to noise.

The zoom motor (Mz) 48 zooms the lens, and the zoom position can be known by the zoom encoder 60. The date module 62 prints data such as date and time on a film. Strobe 6
4 is also connected to the CPU 10.

Next, the operation of this embodiment will be described. First,
The operation of the CPU 10 on the camera side will be described with reference to FIGS. 4 to 28, and then the operation of the CPU 4 on the external device side will be described with reference to FIGS. 29 to 35.

FIG. 4 is a flowchart of a "power-on reset" routine of the camera CPU 10. This routine is started by a reset operation of the reset circuit 22.
That is, when the power is turned on or the power switch is turned on / off, the camera first executes this routine.

In step 102, the input / output ports of the CPU 10 and the internal RAM are initialized. Steps
At 104, it is determined whether the CHECK1 terminal is at the "L" level, that is, whether a communication request has been issued from an external device.
If the CHECK1 terminal is at the "L" level, step 10
In step 6, the subroutine "communication 1 with external device" (FIGS. 24 to 27) is executed.

In the case CHECK1 terminal is not "L" level, or if the subroutine "communication with the external device 1 'has been completed, ² subroutine" E in step 108 -PRO
M reading ”(FIG. 15), and the camera status data, adjustment data, and the like from the E ² -PROM 24 are stored in the RA of the CPU 10.
Written in M. Only here can the camera be operated. If you run out of batteries or turn off the power switch during winding, rewinding, or empty feeding,
Although the operation is interrupted, it is necessary to know the state before the interruption when the power is turned on again.

Referring to the battery check data read from the E ² -PROM 24, a subroutine “battery check” (FIG. 20) is executed in step 110. next,
Referring to camera status data read from the E ² -PROM24, checks the operation state of the camera. Step 11
In step 2, it is determined whether or not the back cover is closed based on the output of the back cover switch that is linked to the opening and closing of the camera back cover. If it is closed, it is determined in step 114 whether rewinding is in progress. If rewinding is in progress, a subroutine "rewind" is executed in step 116.

If it is not during rewinding, it is determined in step 118 whether or not idle feeding is being performed. Step during empty feeding
In step 120, the subroutine "jump feed" is executed. If not, it is determined in step 122 whether or not winding is being performed. If winding is in progress, a subroutine "single frame winding" (FIG. 14) is executed in step 124.

If the back cover of the camera is not closed, the subroutine "rewind", "jump feed" or "wind one frame"
Is completed, or if the film is not being wound, it is determined in step 126 whether the power switch is on.

If the power switch is on,
At step 128, the LCD 38 is turned on, and at step 130, a subroutine "strobe charge" is executed. This is to ensure that flash photography can be performed at any time. In step 132, a 90 second timer is set. This timer is LC
The display time of D38 is limited to 90 seconds. However, as described later, if the user performs any switch operation during display, the 90-second timer is set again at that point.

At step 134, an interruption by the back cover switch (BK), an interruption by the rewind switch (RW), an interruption by various operation switches (KEYG) such as a mode designation switch, and an interruption by the timer (65.5 milliseconds). Allow the reception.

In step 136, the halt mode is set. During the halt operation, the operation of the CPU 10 is stopped, but the clock oscillation of the oscillation circuit 20 is performed, and the LCD 38 can also display for 90 seconds. The standby release during the halt operation is valid only when the interrupt permitted in step 134 occurs.

If the power switch is not on, the LCD 38 is turned off at step 138, only the BK interrupt and the RW interrupt are permitted at step 140, and the stop mode is set at step 142. The standby release in the stop operation is valid only when the interrupt permitted in step 140 occurs.

FIG. 5 to FIG. 7 are flowcharts of the "standby release" routine, and show the halt operation (step 136).
), And is started when an interrupt occurs in the stop operation (step 142). As described above, in this embodiment, the same routine is performed after the standby mode is released, regardless of the halt mode or the stop mode. This is because if an operation after standby release is defined by a vector interrupt, the interrupt is also generated by noise, so that a malfunction is prevented, and a process in the case where the standby is released by mistake is simplified.

In step 150, C is performed in the same manner as in step 102.
The initial setting of the input / output port of the PU 10 and the built-in RAM is performed. In step 152 subroutine "E ² -PR
OM readout ”(FIG. 15). This is to compensate for the case where the contents of the RAM have changed due to noise.

In step 154, it is determined whether or not the interrupt that started this routine is a BK interrupt. In the case of a BK interrupt, it is determined in step 156 whether the back cover is closed. If the back cover is closed, a subroutine "idling" is executed in step 158. When the subroutine "idling" is completed, the flow returns to step 126 to check the state of the power switch.

If the back cover is not closed, step 160
To execute the subroutine "back cover open" to reset the number of frames and camera state data. After the end of the subroutine "back cover opening", the process returns to step 126. If the back cover is neither open nor closed, it is determined that there is noise.

If it is not a BK interrupt or if it is determined that there is noise, it is determined in step 162 whether or not it is a RW interrupt. In the case of an RW interrupt, it is determined in step 164 whether the rewind switch is on. If the rewind switch is on, a subroutine "rewind" is executed in step 166. After the end of the subroutine "rewind", the flow returns to step 126.

If it is not an RW interrupt, or if the rewind switch is not on, it is determined in step 168 whether it is a timer interrupt. In the case of a timer interrupt, the subroutine "display timer count" is executed in step 170 (FIG. 8).
Execute That is, the subroutine "display timer count" is executed every 65.5 milliseconds. After the end of the subroutine "display timer count", the flow returns to step 134.

If not a timer interrupt, step 172
To determine whether rewinding has been completed or whether the unsuccessful feeding has failed. Step 17 if rewinding is not completed and jumping failure is not failed
4. Determine if the power switch is on. When the rewinding is completed, when the idle feeding fails, or when the power switch is not turned on, the process returns to step 126.

If the power switch is on,
At 176, it is determined whether or not it is a KEYG interrupt. If it is not a KEYG interrupt, it is determined in step 178 whether or not the LCD is being displayed. If the LCD display is not being performed, the BK, RW, and KEYG interrupts are permitted in step 180, and the stop mode is set in step 182. In this mode, even if the power switch is on, the LCD 38 goes out because the user has not operated anything for 90 seconds. When the power switch is on, when the user performs any operation,
The LCD 38 returns to the display state.

In the case of a KEYG interrupt, K
At step 184, the KEYG port is switched to the input port so that the switch input can be accepted even if the state of the EYG port has changed. LC at step 186
D38 is turned on.

In step 188, it is determined whether or not the release button has been depressed one step (first step release). In the case of the first stage release, a subroutine "release process" (FIGS. 10 and 11) is executed in step 190.

If it is not the first release, step 19
Step 2 determines whether the camera is in macro mode. If it is not in the macro state, it is determined in step 194 whether the zoom is up or down. In the case of zoom up or zoom down, a subroutine "zoom processing" is executed in step 196.

When the subroutine "release processing" or "zoom processing" is completed, a subroutine "lens reset" is executed in step 197 to return the focusing lens to the reset position.

When the subroutine "lens reset" is completed, the flow returns to step 126. When in macro state,
Otherwise, if it is not zoom-up or zoom-down, it is determined in step 198 whether the macro switch is on. If the switch is on, a subroutine "macro processing" is executed in step 200. When the subroutine "macro processing" is completed, the flow returns to step 126.

If the macro switch is off, the camera mode switch is checked, and the first
It is determined whether the mode switch is on. If the first mode switch is on, a subroutine "self mode" is executed in step 204. The subroutine "self mode" sequentially switches the shooting mode between the normal mode and the self mode. When the subroutine "Self Mode" is completed, the flow returns to step 126.

If the first mode switch is off, it is determined in step 206 whether the second mode switch is on,
If the second mode switch is on, a subroutine "photometry mode" is executed in step 208. The subroutine "Metering mode" is used for the metering method, average metering, spot metering,
Switch sequentially to spot highlight metering and spot shadow metering. When the subroutine "photometry mode" is completed, the flow returns to step 126.

If the second mode switch is off, it is determined in step 210 whether the third mode switch is on.
If the third mode switch is on, a subroutine "strobe mode" is executed in step 212. In the subroutine "strobe mode", the light emission mode is sequentially switched to automatic light emission, forced light emission (daylight synchronization), and light emission inhibition. Step 12 when subroutine "strobe mode" ends
Return to 6.

If the third mode switch is off, it is determined in step 214 whether the fourth mode switch is on,
If the fourth mode switch is on, a subroutine "camera mode" (FIG. 9) is executed in step 216. In the subroutine "camera mode", the camera mode is sequentially switched to standard (one frame), auto zoom, continuous shooting, multiple exposure (two images) shooting, and ∞ mode. When the subroutine "camera mode" is completed, the flow returns to step 126.

If the fourth mode switch is off, the routine returns to step 134. FIG. 8 is a flowchart of the subroutine "display timer count" (step 170 in FIG. 5).
At step 230, it is determined whether the CHECK1 terminal is "L". If the CHECK1 terminal is "L", step 23
In step 2, the subroutine "communication 1 with external device" (FIGS. 22 to 27) is executed. For this reason, the subroutine "communication 1 with external device" can be executed every 65.5 milliseconds.
Cannot be executed continuously. As described later, a program for continuously executing the subroutine "communication 1 with external device 1" is provided separately.

If the CHECK1 terminal is not "L", or if the subroutine "communication 1 with external device" is completed, it is determined in step 234 whether 90 seconds have elapsed.
If 90 seconds have elapsed, the flow returns to step 180 (FIG. 6) to enter the stop mode. Step if not 90 seconds
At 236, a subroutine "LCD blinking process" is executed. Here, a warning display or the like on the LCD 38 is turned on / off at an interval obtained by dividing 65.5 milliseconds by a fixed amount, and blinks. After the subroutine "LCD blinking process" is completed, the routine returns to step 134.

FIG. 9 is a flowchart of the subroutine "camera mode" (step 216 in FIG. 7). Steps
At 240, the mode RAM (MRAM) is incremented (MRAM ← MRAM + 1). MRAM in step 242
Is determined to be 5 or more. If the MRAM is 5 or more, the mode RAM is reset in step 244 (MRA).
M ← 0). That is, data 0, 1, 2,
3 and 4 correspond to the standard, auto zoom, continuous shooting, multiple exposure, and ∞ camera modes.

FIGS. 10 and 11 are flowcharts of the subroutine "release processing" (step 190 in FIG. 6). At step 250, it is determined whether or not the CHECK1 terminal is "L". If the CHECK1 terminal is "L", the subroutine "communication with external device 2" is executed in step 252 (FIG. 24).
To FIG. 27).

If the CHECK1 terminal is not "L", or if the subroutine "communication with external device 2" has been completed, the subroutine "photometry" is executed in step 254.
In step 256, it is determined whether the mode is the mode. In the case of the ∞ mode, ∞ data is set in step 258 as distance data. In step 260, a subroutine "ranging" is executed.

When the $ data is set as the distance data, or when the subroutine "ranging" is completed, it is determined in step 262 whether or not the mode is the auto zoom mode. In the case of the auto zoom mode, a subroutine "auto zoom" is executed in step 264. The subroutine "auto zoom" automatically sets the zoom position according to the distance data so that a person is always photographed at a fixed size regardless of the photographing distance.

If the automatic zoom mode is not set and the subroutine "auto zoom" is completed, a subroutine "AF (lens extension)" (FIG. 12) is executed in step 266 to drive the focus lens to the in-focus position. In step 268, a subroutine "exposure calculation" is executed.

In step 270, it is determined whether or not the release button has been fully depressed (second stage release). If it is not the second release, it is determined in step 272 whether it is the first release. Step 270 for the first release
Return to This state is an AF lock state. When the first release is released, the routine returns to the original routine.

In the case of the second stage release, the photographing operation is started,
First, in step 274, a subroutine "battery check" (FIG. 20) is executed. As will be described later, if there is no battery, the operation is stopped here.

At step 276, it is determined whether the mode is the self mode. In the case of the self mode, it is determined at step 278 whether the first mode switch is on. If the first mode switch is on, the flow returns to step 126 (FIG. 4) to check the state of the power switch. That is, by turning on the first mode switch, the self-waiting state can be canceled halfway.

If the first mode switch is off, it is determined in step 280 whether the self-timer (12 seconds) has counted up (finished). If the counting is not completed, the flow returns to step 278.

If it is not the self mode or if the counting is completed, a subroutine "exposure" is executed in step 282 to perform a shutter operation. In the case of the strobe light emission mode, the strobe light is emitted here.

In step 284, it is determined whether the mode is the multiple exposure mode. In the case of the multiple exposure mode, it is determined in step 286 whether the multiple single image flag is set. Multiple 1
If the sheet flag is not set, the multiplexed single sheet flag is set in step 286. Run the subroutine "E ² -PROM writing" (FIG. 19) at step 290, returns to the original routine. As a result, the multiple single sheet flag is set to E
^2- Write to PROM 24. If the multiplex single sheet flag is set, the multiplex single sheet flag is reset in step 292.

If the mode is not the multiple exposure mode or
When the sheet flag is reset, it is determined in step 294 whether or not there is a film. If there is a film, a subroutine "winding one frame" (FIG. 14) is executed in step 296.

If there is no film, or if the subroutine "winding one frame" is completed, it is determined in step 298 whether or not the mode is the continuous shooting mode. In the case of the continuous shooting mode, the process returns to step 270, and continuous shooting continues as long as the release button is pressed. If the mode is not the continuous shooting mode, the process returns to the original routine.

FIG. 12 is a flowchart of the subroutine "AF (lens extension)" (step 266 in FIG. 10). In step 302, the timer is reset. Step 30
3 in determining a lens extension target position by adjusting data of distance measurement data and E ² -PROM. In step 304, the shutter motor Ms is rotated forward to drive the focusing lens.

In step 306, the photo interrupter PIs
It is determined whether the output has fallen (one pulse has been generated). If so, the counter is counted up in step 308. Using this count value, it is determined in step 310 whether the focusing lens has been extended to the target position. If it has not been advanced to the target position, the flow returns to step 306.

If it has been moved to the target position, the rotation of the shutter motor Ms is stopped in step 312. At step 314, the AF lens flag is reset. Step 31
Subroutine "E ² -PROM writing" in 6 (FIG. 19)
Execute Thereafter, the process returns to the original routine.

At step 306, the photo interrupter PIs
If the output has not fallen, it is determined in step 318 whether one second has elapsed since the fall of the photointerrupter. If one second has not elapsed, the process returns to step 306. If one second has elapsed, it is determined that there is an abnormality, and in step 320, the rotation of the shutter motor Ms is stopped. AF indicating abnormality
A lens flag is set in step 322.

[0073] subroutine at step 324 "E ² -PR
OM writing ”(FIG. 19). In step 326, a subroutine "damage processing" (FIG. 13) is executed. FIG. 13 is a flowchart of the subroutine "damage processing". At step 332, all actuators are turned off. At step 334, a port is initially set. Steps
Set the 90 second timer with 336. Step 338 at 90
Determine if seconds have elapsed.

If 90 seconds have elapsed, the stop mode is set in step 340. Step 340 forms an endless loop. Even if the stop mode is canceled due to noise, the stop mode cannot be canceled by setting the stop mode again. Naturally, it is needless to say that an initial setting of a port and an instruction for disabling stop release are inserted in this endless loop.

If 90 seconds have not elapsed, step 34
At 2, it is determined whether the CHECK1 terminal is "L". CH
If the ECK1 terminal is "L", the subroutine "communication with external device 3" (FIGS. 24 to 27) is executed in step 344. Thus, communication with an external device is possible even during a camera abnormality.

If the CHECK1 terminal is not "L", or if the subroutine "communication with external device 3" has been completed, the timer interrupt is permitted in step 364, and step 36
6 enters halt mode. When the halt mode is released by the timer interrupt, the process returns to step 338. This subroutine operates until a power-on reset.

FIG. 14 is a flowchart of the subroutine "wind one frame" (step 124 in FIG. 4, step 296 in FIG. 11). At step 370, it is determined whether or not the film is being wound. If not, the winding counter is reset at step 372. In step 374, a winding flag is set. In step 376 subroutine "E ² -PR
OM writing ”(FIG. 19) and set the winding flag to E.
^2- Write to PROM 24. This is to restore the previous state even if the power is turned off during winding.

During winding, or in the subroutine "E
^{When the} " ^2- PROM writing" is completed, the winding motor Mw is rotated forward in step 378 to wind the film. In step 380, it is determined whether or not the output of the photo interrupter PIw has fallen (one pulse has been generated). If it has fallen, the winding counter is counted up in step 382. Using this count value, it is determined in step 384 whether the winding of one frame has been completed.

If the output of the photo-interrupter PIw has not fallen, or if the winding of one frame has not been completed, it is determined in step 394 whether or not the film has ended.
In the film end, the output of the photo interrupter PIw is 2
It does not change for more than a second. If it is not the film end, the flow returns to step 380. If it is the film end, the subroutine "rewind" is executed in step 396.

When the winding of one frame is completed, step 38
At 6, the rotation of the hoist motor Mw is stopped. Step 388
To increment the frame number counter. At step 390, the winding flag is reset. Run the subroutine "E ² -PROM write" (FIG. 19) at step 392,
Hoisting flag (reset) written in the E ² -PROM24. Thereafter, the process returns to the original routine.

Note that the subroutine "Jump-Advance" automatically winds several frames of film after loading the film and closing the back cover, and executes the subroutine "Single-frame winding" several times continuously. is there. The subroutine "rewinding" is similar to the subroutine "single frame winding", in which the winding motor is reversed until the film stops.

[0082] Figure 15 is a flowchart of a subroutine "E ² -PROM reading" (step 108 in FIG. 4, step 152 of FIG. 5). In step 402 E ² -PROM
24 is reset to 1, and at step 404 E ²
-Set the mode of the PROM 24 to the read mode. At step 406, the CPU 10 is set to the serial communication input mode, and at step 408, EP is set to the RAM address (ADR).

The contents of each RAM address are shown in FIG.
It is shown as follows. Each data is 8-bit data. The contents of each bit of the camera status data at the RAM address EP + 1 are as shown in FIG. 17, and the contents of each bit of the abnormal data at the RAM address EP + 2 are as shown in FIG.

[0084] In the step 410 from the E ² -PROM24 8
One of the bit data a serial input, E ² -PROM2
4 is incremented. At step 412, the serial input data is set at the RAM address (ADR). At step 414, the RAM address is incremented. RAM address in step 416. E ² -PROM
It is determined whether the number of data exceeds 24. If exceeded, return to the original routine; otherwise, step 410
And serially inputs eight bits of data at the next address.

[0085] Figure 19 is a flowchart of a subroutine "E ² -PROM write" (step 290, etc. of FIG. 11). Reset the E ² -PROM24 at step 422, and 1 address of E ² -PROM24. In step 424 sets the E ² -PROM24 the write mode. In step 426, set the serial communication output mode,
At step 428, EP is set to the RAM address (ADR).

At step 430, the data of the ADR address is set in the serial out register of the CPU 10, and
Serial output 432, E ² -P eight-bit data
Transfer to the ROM 24. At step 434, the RAM address is incremented.

In step 436, when the RAM address is E ² -P
It is determined whether the number of data in the ROM 24 has been exceeded. If it exceeds, the process returns to the original routine. If it does not exceed, the process returns to step 430 to serially output eight bits of data at the next address.

FIG. 20 is a flowchart of the subroutine "battery check" (step 110 in FIG. 4).
As shown in FIG. 21, the battery check uses a voltage obtained by dividing the power supply voltage VDD in the camera by resistors R1 and R2 as CP.
The digital value is converted by the A / D converter built in U10,
This is performed by comparing this with the battery check data stored in the E ² -PROM 24. Here, since the values of the resistors R1 and R2 vary from camera to camera, an A / D conversion value of the power supply voltage VDD is determined for each camera before shipment of the camera, and the adjustment value (battery check data) ) Is written in the E ² -PROM 24. This writing program is stored in an external device, and the program is executed by communication with the external device.

The reference voltage Vref for A / D conversion is CP
It is supplied from the IFIC 40 according to a command from U10.
Subroutine "battery value A / D conversion" in step 440
Execute In step 442, it is determined whether the A / D conversion value is equal to or larger than the adjustment value. If not, go to step
At 444, the subroutine "display without battery" is executed.
At step 446, the key is locked, and at step 448, the stop mode is set. In this case also, an endless loop is formed. This is to return to the low current consumption mode (stop) immediately even if the stop is released due to noise or the like.

If it is not less than the adjustment value, it is determined in step 450 whether the A / D conversion value is not less than [adjustment value + constant value]. If not (adjustment value + constant value), step 45
2 sets the low battery flag and returns to the original routine. If it is equal to or more than [adjustment value + fixed value], step 45
4 Resets the low battery flag and returns to the original routine.

Next, communication with an external device will be described. FIG. 22 is a diagram for explaining various modes of communication according to this embodiment. First, the communication mode can be roughly divided into a standard mode and a utility mode. This is the mode designation code SYAD generated from the external device.
2, SYAD2 = 0, 1, 15 is the standard mode, and SYAD2 = 2 is the utility mode. 0, 1, and 15 of SYAD2 correspond to usable upper addresses of the RAM built in the CPU 10, respectively. Standard mode is mode designation code C
The mode is subdivided into a RAM read mode and a RAM write mode depending on whether the KDT is “read” or “write”. In the utility mode, a subroutine call mode (SYAD = 0), a jump mode (SYAD = 1), a continuous communication mode (SYAD = E),
It is subdivided into the continuous communication release mode (SYAD = D).

The format of the communication data between the camera and the external device is constant. As an example, the format of communication data between the CPU 10 and the external device in the RAM read mode and the RAM write mode is shown in FIG.
(A) and (b) show. In the figure, “out” is data transmitted from the camera to the external device, and “in” is data transmitted from the external device to the camera.

Data is transmitted via the data line DATA in synchronization with the clock CLK generated from the CPU 10 of the camera. Here, the communication with the external device is classified into communication 1 to communication 3 depending on which routine is in progress. First, the synchronization signal for identifying these is determined by the CPU 10 regardless of the RAM read mode or the RAM write mode.
Output from The synchronization signal for communication 1, communication 2, and communication 3 is composed of 2, 3, and 4 pulses, respectively.

Here, communication 1 is "power-on reset".
The communication is performed during the routine (FIG. 4) and the "display timer count" routine (FIG. 8), the communication 2 is performed during the subroutine "release processing" (FIGS. 10 and 11), and the communication 3 is performed during the subroutine " Damage processing ”(FIG. 13).

As described above, by changing the synchronization signal depending on the time of communication, for example, an optional operation of performing communication only during release and performing a specific control can be performed, and the camera function can be expanded. Further, it is possible to easily determine whether the camera sequence is being performed or a damage process is being performed.

In the RAM read mode, FIG.
As shown in the figure, following the synchronization signal, the mode designation code C
KDT (4 bits), SYAD2 (4 bits), SYA
D (8 bits) is communicated from the external device to the camera. S
YAD2 and SYAD are read addresses of the RAM.
The next input data (8 bits) is undefined, and then R
Data read from the AM is communicated from the camera to an external device.

In the RAM write mode, FIG.
As shown in the figure, following the synchronization signal, the mode designation code C
KDT, SYAD2, SYAD, write data SYDT
Is communicated from the external device to the camera, and SYAD2, SYA
SYDT is written to the RAM address indicated by D. Thereafter, the check code POFCK is transmitted from the external device to the camera. This is the check code is CPU
In order to operate the RAM in the apparatus 10, it is checked whether or not communication has been normally performed to the end.

FIGS. 24 to 27 show flowcharts of communication with an external device in such a format. FIG.
4. FIG. 25 shows a subroutine "communication 1 with external device",
"Two" and "Third" are shown together. In the case of communication 1 with the external device, 2 is set to N in step 502, and in the case of communication 2 with the external device, 3 is set to N in step 504.
Is set, and in the case of communication 3 with an external device, step 506 is executed.
Sets 4 to N. Thereafter, at step 508, a synchronization pulse is output N times.

At step 510, the CPU 10 is set to the serial communication input mode. At step 512, eight clocks CLK are generated, and eight bit data from the external device are serially input. At step 514, the serial input data is written to the CKDT and SYAD2 addresses of the RAM. Step 516
To input the next data serially. At step 518, the serial input data is written to the SYAD address of the RAM.
At step 520, the next data is serially input. At step 522, the serial input data is written to the SYDT address of the RAM.

In step 524, it is determined whether the mode is the read (read) mode or the write (write) mode based on CKDT. In the case of the read mode, SYAD
2. The data of the SYAD address is set in the serial buffer. At step 528, the serial communication output mode is set. At step 530, data (read data of FIG. 23A) is serially output to an external device, and thereafter, the routine returns to the original routine.

In the case of the write mode, the next data is serially input in step 532, and it is determined in step 534 whether the input data is a check code (POCKF). If the input data is not a check code, a serial communication error is determined and the process returns to the original routine.

If the input data is a check code, it is determined in step 536 whether SYAD2 is 0, 1, or 15. If SYAD2 is 0, 1, or 15, it is determined that the mode is the standard mode.
The data of the SYDT address is written to the YAD2 and SYAD addresses, and the process returns to the original routine.

If SYAD2 is not 0, 1, or 15, it is determined at step 540 whether SYAD2 = 2. If SYAD2 is not equal to 2, a serial communication error is determined and the process returns to the original routine. If SYAD2 = 2, it is determined that the mode is the utility mode.
It is determined whether or not SYAD = 0.

If SYAD = 0, the subroutine call mode is determined, and the data in the RAM buffer is moved to the register in step 544. In step 546, a subroutine "subroutine call" (FIG. 28) is executed. Step 54
After transferring the register data to the RAM buffer in step 8, the process returns to the original routine. Here, the RAM buffer is used so that, when a subroutine is continuously executed in the continuous communication mode described later, the contents of the register immediately after the execution of the previous subroutine are used when the next subroutine is executed. is there. That is, the subroutine using the register value as an argument can be executed continuously.

If SYAD is not 0, step 550
To determine if SYAD = 1. If SYAD = 1, it is determined that the mode is the jump mode. At step 552, it is determined whether the mode is the continuous mode. In the continuous mode, the stack is increased by one subroutine ("communication 1 with external device 1" (step 562) in the continuous mode described later), so the stack pointer is returned by one subroutine in step 554. Move on to step 556. If not in the continuous mode, the process immediately proceeds to step 556. In step 556, data indicated by the RAM address (BRADR) is set in the stack. Thereafter, when there is a return instruction, the contents of (BRADR) transferred to the stack are transferred to the program counter, thereby jumping to the address indicated by (BRADR).

If SYAD is not 1, step 558
To determine whether SYAD = E. When SYAD = E, it is determined that the communication mode is the continuous communication mode. If not in the continuous mode, a subroutine "communication 1 with external device" is executed in step 562. In step 564, it is determined whether the CHECK1 terminal is "L". If the CHECK1 terminal is "L", step 562 is executed again. This allows the camera and the external device to communicate continuously. That is, it is in the continuous mode. In the continuous mode, if the CHECK terminal 3 is not "L" because the EXT terminal 3 is disconnected or the external device 2 stops communication, the original routine is executed. Return to

If SYAD = E is not satisfied, step 566 is executed.
It is determined whether or not SYAD = D. When SYAD = D, it is determined that the communication mode is the continuous communication release mode. If it is in the continuous mode, the stack pointer is set for one subroutine in step 570 (“communication 1 with external device” in the continuous mode (step 562)).
And return to the original routine. If SYAD = D is not established, or if not in the continuous mode, the routine immediately returns to the original routine.

FIG. 28 is a flowchart of the subroutine "subroutine call" (step 546 in FIG. 26). Here, R is added to the stack as shown in step 574.
By setting data indicated by the AM address (BRADR) and changing the program counter to the address indicated by (BRADR) in accordance with the content of (BRADR) set on the stack immediately before by the return instruction, (BRADRR) Execute the subroutine indicated by. Since the stack still has the return address that called the "subroutine call" (step 546), (BR
A "subroutine call" by a return instruction at the end of the subroutine at the address indicated by (ADR) (step 546)
The program moves to the next step 548 (return).

Next, an example of the operation of the CPU 4 of the external device which realizes various functions by using the above-described program of the camera CPU 10 will be described. FIGS. 29 and 30 are flowcharts of a subroutine "battery check voltage adjustment" of the external device CPU4. This is the camera CPU1
For each camera before shipping the adjustment value to be referred to in 0 subroutine of "battery check" which is a function of writing to E ² -PROM24.

In step 602, the CHECK1 terminal is set to "L".
And sends a communication request to the camera. At step 604, the continuous communication mode is set. That is, CKDT =
"Write", SYAD2 = 2, SYAD = E. At step 606, the communication condition is set to 1 (N = 2). Steps
At 608, the camera is reset, and the camera CPU 10 starts a subroutine "power-on reset". Subroutine "communication with camera" at step 610 (FIG. 32)
Execute

Thus, the CPU 10 of the camera performs the first communication after the power-on reset (step 106 in FIG. 4).
To enter the continuous communication mode. Here, if the continuous communication mode is not set, the camera-side program proceeds to steps 108 and 110, and performs a subroutine "battery check" with an adjustment value that has not been adjusted. If the adjustment value is a large value, the camera operation is locked in step 448 (FIG. 20).

At step 612, data for turning on the IFIC 40 is set. At step 614, the write mode is set. That is, SYAD2 = 15 (output upper address for IFIC), SYAD = “output lower address for IFIC”,
SYDT = “IFIC on data”, CKDT = “write”. In step 616, a subroutine "communication with camera" is executed.

Thus, IFIC 40 outputs reference voltage Vref for A / D conversion shown in FIG. In step 618, SYAD2 and SYAD are set to (BRAD
R) RAM address in SYDT
/ D conversion ”, the step 62
0 executes the subroutine "communication with camera". That is, the start address of the subroutine "A / D conversion" is set to R
Set to AM address (BRADR). Step 62
Use 2 to set the subroutine call mode. That is, CKDT = “write”, SYAD2 = 2, SYAD
= 0. In step 624, a subroutine "communication with camera" is executed.

Thus, the subroutine "A / D conversion"
Is executed, and the power supply voltage VDD of the camera is
/ D conversion. In step 626, the read mode is set. That is, CKDT = “read”. In step 628, an adjustment value (battery check data) obtained from the A / D conversion value is set in SYAD2 and SYAD. In step 630, a subroutine "communication with camera" is executed.

As a result, the battery check data is once read out to the external device. SYAD at step 632
2, RAM for writing battery check data to SYAD
Address (EP + 3) is set. Step 63
0 sets the read battery check data in SYDT. At step 636, the write mode is set.
That is, CKDT = “write”. Step 638
To execute the subroutine "communication with camera".

Thus, R for writing to the E ² -PROM is
Battery check data is written to the AM address (EP + 3). To set the starting address of the subroutine "E ² -PROM writing" to SYDT in step 640. Also, SYAD2 and SYAD have R
Set the AM address. In step 644, a subroutine "communication with camera" is executed. At step 646, the subroutine call mode is set. In step 648, a subroutine "communication with camera" is executed.

As a result, the battery check data is written to E ² -PROM 24. Thereafter, the process returns to the original routine. FIG. 31 is a flowchart of the subroutine "AF lens drive adjustment". Camera CPU 1 described above
In the subroutine “AF (lens extension)” of 0, if the focusing lens does not move even after 1 second from the turning on of the motor, it is determined that the focusing lens is abnormal. When the time is adjusted for each camera before shipment, a subroutine "AF lens drive adjustment" is executed.

In step 652, the head address of the subroutine "AF (lens extension)" is set in SYDT. Also, SYAD2 and SYAD have R
Set the AM address. In step 654, a subroutine "communication with camera" is executed. At step 656, a subroutine call mode is set. At step 658, a subroutine "communication with camera" is executed.

Thus, the subroutine "AF (lens extension)" is executed. At this time, a switch (AFs) used as a reference for driving the focusing lens in another measuring device.
From 52 to the lens reference position, a photo interrupter (P
Is) The number of output pulses of 54 is measured.

At step 660, the number of synchronization signals is detected.
In step 662, it is determined whether the number of synchronization signals is four. If it is 4, an error display is made in step 664, and the end processing is performed. That is, adjustment cannot be performed because a lens drive abnormality has occurred.

If it is not 4, SYDT in step 666
To the SYAD2 and SYAD (EP +
5) Set the RAM address. At step 670, the write mode is set. At step 672, a subroutine "communication with camera" is executed.

Thus, the R for writing to the E ² -PROM is obtained.
AF adjustment data is written to the AM address (EP + 3). Subroutine to SYDT in step 674 "E ² -P
ROM write "is set. Also, S
The RAM address of (BRADR) is set in YAD2 and SYAD. At step 678, a subroutine "communication with camera" is executed. At step 680, the subroutine call mode is set. In step 682, a subroutine "communication with camera" is executed.

Thus, the AF adjustment data is written into the E ² -PROM 24. Thereafter, the process returns to the original routine. FIG. 32 is a flowchart of the subroutine "communication with camera" shown in FIGS. Steps
At 673, it is determined whether there is a synchronization signal. If there is a synchronization signal, it is determined in step 675 whether the number of synchronization signals is 2, 3, or 4. If the number of synchronization signals is 2,
If neither of 3 and 4, the process returns to step 673.
If the number of synchronization signals is one of 2, 3, and 4, the serial communication output mode is set in step 677.

At step 679, CKDT and SYAD2 data are set in the serial buffer. At step 681, the data in the serial buffer is serially output in synchronization with the clock CLK from the camera CPU 10. Step 68
3. Set the SYAD data in the serial buffer.
At step 684, the data in the serial buffer is serially output. At step 686, SYDT data is set in the serial buffer. In the case of the read mode, SYDT may be dummy data. At step 688, the data in the serial buffer is serially output.

At step 690, the read mode (CKDT =
"Read") is determined. If not in the read mode, in step 692, the POFCK data is set in the serial buffer. At step 694, the data in the serial buffer is serially output. Then, the process returns to the original routine.

If it is the read mode, step 696
To set the serial communication input mode. Step 698
And data from the camera (readout data in FIG. 23 (a))
Serial input. Then, the process returns to the original routine.

Other adjustment data (shutter adjustment data, etc.) can be adjusted for each camera before shipment by similarly programming the CPU of the external device. As a result, various determinations can be accurately performed irrespective of camera variations due to components and the like.

Next, the operation of the external device as an optional device for extending the shooting mode will be described. As an example, the subroutine "Multi-four-shot shooting" will be described with reference to FIGS. This program is to operate the multiple image capturing flag by an external device and to execute the multiple image capturing routine (steps 286 to 290 in FIG. 11) many times in the subroutine "release process" of the camera CPU. That is, normally, when the first exposure is performed, the multiple single shooting flag is set, and when the multiple single shooting flag is set after the end of the next exposure, film winding is performed.
Therefore, the external device clears the multiplex single image capturing flag set after the end of the exposure, so that an arbitrary number of multiplex images can be captured.

In step 702, the number (multiplex number) counter is reset. In step 704, the CHECK1 terminal is set to "L", and a communication request is output to the camera. Steps
At 706, the communication condition is set to 2 (N ← 3), and the release standby state is set.

At step 708, the continuous communication mode is set. At step 710, a subroutine "communication with camera" is executed. Thus, continuous communication with the camera is started in a subroutine "release process" (FIGS. 10 and 11) executed when the user presses the release switch. At this time, it is assumed that the camera is set to the multiple exposure mode.

Here, since the camera is in the continuous communication mode, the program in the camera does not proceed, and the state of the camera can be freely changed at the beginning of the subroutine "release processing".

At step 712, the communication condition is returned to 1 (N ← 2). However, continuous communication with the camera is continuing. At step 714, the RAM read mode is set. At step 716, the RAM read address EP + 1 is set in SYAD2 and SYAD. In step 718, a subroutine "communication with camera" is executed, and camera state data is read from the RAM.

At step 720, the multiple single shooting flag (6 bits of the camera status data) is cleared. Step 722
To set the RAM write mode. S in step 723
RAM address EP + 1 is added to YAD2 and SYAD,
In DT, the camera state data in which the multiple single shooting flag is reset is set. In step 724, a subroutine "communication with camera" is executed. The camera state data in which the multiple single shooting flag is reset is written to the RAM. This enables multiple four exposures. At step 726, the continuous communication release mode is set. In step 728, the subroutine "communication with camera" is executed, and the camera program is returned to the subroutine "release processing". Thereafter, communication with the camera is interrupted. Here, on the camera side, when the second-stage release is pressed, the exposure operation is performed as the first multiplex, and when the release is already released, the routine returns to the original routine without exposure. In the case of exposure, the multiplex single image shooting flag is set so that it can be confirmed.

At step 730, the subroutine "read RAM address EP + 1" is executed. At step 732, it is determined whether or not the multiple single shooting flag is "1" (set).
If the multiple single shooting flag is not "1", the release has been interrupted (not exposed), and the flow returns to step 706. If the multiple single shooting flag is "1", the exposure has been performed, and the number counter is incremented in step 734.

In step 736, it is determined whether or not the number counter is 3. If the number counter is 3, step 70
Return to 6. That is, the process returns to the next "release process" so that the film can be wound. If the number counter is not 3,
At step 738, the continuous communication mode is set. Steps
At 740, the subroutine "communication with camera" is executed. Here, for the continuous communication mode, E ² in order to want to change the contents of -PROM, unless the continuous communication mode, always refresh the contents of the E ² -PROM in the camera routine (FIG. 5, step 152 ), E ² −
The contents of the PROM cannot be changed.

In step 742, the multiplex single-image shooting flag is reset. At step 746, the RAM write mode is set. Here, the RAM write address EP + 1 is set in SYAD2 and SYAD. SYDT is camera state data in which the multiple single shooting flag is reset. In step 748, a subroutine "communication with camera" is executed.

[0137] to set the starting address of the subroutine "E ² -PROM writing" to SYDT in step 750,
The BRARA RAM address is set in SYAD2 and SYAD. In step 752, a subroutine "communication with camera" is executed. At step 754, the subroutine call mode is set. In step 756, a subroutine "communication with camera" is executed.

At step 758, the continuous communication release mode is set. In step 760, a subroutine "communication with camera" is executed. At step 762, it is determined whether or not the number counter is four. If the number counter is not 4, the process returns to step 706. If the number counter is 4, the CHECK1 terminal is set to "H" in step 764, and the routine returns to the original routine.

Thus, even when the camera CPU contains only a multiplexed two-image shooting program, three or more multiplexed images can be executed by controlling the contents of the RAM of the camera CPU by an external device.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the invention. For example, the external device, mainly an external device for a photographing option, may be configured not as an adapter device but as an IC card, and rather, this is preferable because it is small and lightweight. Further, the CPU is not limited to a one-chip microcomputer.

[0141]

As described above, according to the present invention,
Even if the power is cut off, the abnormal state of the lens drive can be stored, and if the power is cut off during the error processing,
It is possible to provide an autofocus camera that can continue the abnormality processing when the power is turned on again.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an embodiment of a camera according to the present invention.

FIG. 2 is a diagram showing connection between a camera and an external device.

FIG. 3 is a detailed block diagram of a camera.

FIG. 4 is a flowchart of a “power-on reset” routine.

FIG. 5 is a flowchart (part 1) of a “standby release” routine.

FIG. 6 is a flowchart (part 2) of a “standby release” routine.

FIG. 7 is a flowchart (part 3) of a “standby release” routine;

FIG. 8 is a flowchart of a subroutine “display timer count”.

FIG. 9 is a flowchart of a subroutine “camera mode”.

FIG. 10 is a flowchart (part 1) of a subroutine “release processing”.

FIG. 11 is a flowchart (part 2) of a subroutine “release process”;

FIG. 12 is a flowchart of a subroutine “AF (lens extension)”.

FIG. 13 is a flowchart of a subroutine “damage processing”.

FIG. 14 is a flowchart of a subroutine “winding one frame”.

FIG. 15 is a flowchart of a subroutine "E2-PRM reading".

FIG. 16 is a view showing contents stored in each RAM address.

FIG. 17 is a diagram showing the contents of each bit of camera status data.

FIG. 18 is a diagram showing the contents of each bit of abnormal data.

FIG. 19 is a flowchart of a subroutine “E2-PRM writing”.

FIG. 20 is a flowchart of a subroutine “battery check”.

FIG. 21 is a block diagram showing circuit connections for battery check.

FIG. 22 is a diagram showing types of communication modes of the camera.

FIG. 23 is a view showing a communication format between a camera and an external device in a RAM read mode and a RAM write mode.

FIG. 24 shows a subroutine “communications 1, 2, 2,
3 "(Part 1).

FIG. 25 shows a subroutine “Communications 1, 2, 2 with external devices”.
3 "(part 2).

FIG. 26 illustrates a subroutine “Communications 1, 2, 2, 3
3 "(part 3).

FIG. 27 shows a subroutine “Communications 1, 2, 2, 3
3 "(part 4).

FIG. 28 is a flowchart of a subroutine “subroutine call”.

FIG. 29 shows a subroutine “battery check voltage adjustment”.
Flowchart (No. 1).

FIG. 30 shows a subroutine “battery check voltage adjustment”.
Flowchart (No. 2).

FIG. 31 is a flowchart of a subroutine “AF lens drive adjustment”.

FIG. 32 is a flowchart of a subroutine “communication with camera”.

FIG. 33 is a flowchart (No. 1) of a subroutine “Multi-four-shot shooting”.

FIG. 34 is a flowchart (part 2) of a subroutine “Multi-four shots”.

FIG. 35 is a flowchart (part 3) of a subroutine “Multi-four shots”;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Camera, 2 ... External device, 3 ... External terminal, 4, 10 ...
CPU, 22 reset circuit, 24 E2 -PRM, 2
8 Serial line, 30 AF sensor, 34 Operation switch, 40 Interface, 42 Photometry unit, 44 Shutter motor, 46 Winding motor, 48
... zoom motors, 54, 58 ... photo interrupters.

Claims (1)

(57) [Claims] 1. A means for detecting a focus adjustment amount of a photographic lens; a means for driving the photographic lens based on the focus adjustment amount; a pulse generation means for generating a pulse in accordance with the driving of the photographic lens; Abnormality determining means for determining that an abnormality has occurred when the pulse has not been generated for a predetermined period of time, and retaining a stored state even when the power of the camera is cut off
A storage unit configured by an electrically rewritable nonvolatile storage element and storing an abnormal state based on the abnormality determination; and when the abnormality determination unit determines that the state is abnormal,
Stop driving by the above-mentioned driving means and
An auto-focus camera, comprising: an abnormality processing unit that can execute communication of the camera.