JP3280117B2 - Camera control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a zoom device, and more particularly to a home position check of a rear lens group of a zoom device.

[0002]

2. Description of the Related Art In recent years, cameras, especially compact cameras, have been required to be smaller in overall size.
An important issue is how to reduce the size of the lens barrel. And in a camera having a two-group zoom device,
In order to reduce the size of the lens barrel, a mechanism for driving the front lens group and the rear lens group with separate motors in place of the mechanical cam has been adopted. In such a mechanism, a DC motor is used as a motor for driving the front group lens,
Generally, a stepping motor is used as a motor for driving the rear group lens.

As this two-unit zoom device, there is one having a configuration as shown in FIG. The lens barrel 4 of the zoom device 2 includes a fixed barrel 6 forming a part of the camera body, an intermediate barrel 8 nested in the fixed barrel 6, and further nested in the intermediate barrel 8. And the moving cylinder 10.

A front lens group 22 is provided in the front end of the movable barrel 10.
Is fixed, and is driven back and forth integrally with the movable cylinder 10 by a DC motor (not shown).

[0005] In the moving barrel 10, a front lens group 22 is provided.
A rear group lens 28 is disposed movably back and forth (on the camera body side). The rear lens group 28 is driven back and forth by a stepping motor (not shown).

FIG. 1A shows the longest telephoto state with the longest focal length, and FIG. 1B shows the widest angle state with the shortest focal length.

In such a zoom device 2, the position of the front group lens 22 can be always detected by a position sensor 24 composed of a sliding resistor or the like. on the other hand,
Regarding the position of the rear group lens 28, a position where the rear group lens 28 comes closest to the front group lens 22 is defined as a reference position (this position is referred to as a “home position” in this specification).
It is determined from the total (accumulated pulse number) of the pulse signals output to the stepping motor. The arrangement of the rear lens group 28 at the home position is detected by using a home position sensor including a limit switch or a photoelectric sensor.

[0008]

In the conventional zoom apparatus as described above, the rear lens is moved to the home position to check whether the rear lens is properly arranged at the home position. The check is performed only when the lens barrel is driven from the collapsed position in the camera body to the widest angle state shown in FIG. 1B. For this reason, in the related art, the position of the rear lens group during the zoom operation can be obtained only from the number of accumulated pulses stored in the RAM.

Therefore, when an abnormality occurs in the driving of the stepping motor due to a decrease in the driving voltage or the like, the position of the rear group lens obtained from the accumulated pulse number is different from the actual position. There is. This displacement,
If so-called step-out occurs, the rear lens group cannot be accurately positioned at the focusing position during exposure, causing problems such as out of focus.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a camera control device capable of checking a home position of a rear group lens even during a zoom operation.

Another object of the present invention is to limit the switches that can be operated, because if the driving of the rear group lens is found to be abnormal by the home position check during the zoom operation, proper photographing cannot be performed. It is in.

[0012]

In order to achieve the above object, a control device according to the present invention is a zoom device comprising a front lens group and a rear lens group, wherein the rear lens group is driven by a stepping motor. In the camera having the following, when the focal length is the longest during the zoom operation, to arrange the rear group lens at the home position where the rear group lens is closest to the front group lens,
It is characterized by comprising control means for controlling the driving of the stepping motor and detection means for detecting that the rear lens group is located at the home position.

Further, according to the present invention, when the stepping motor is driven by the control means, when the detection means detects that the rear lens group is not located at the home position, only the predetermined switch functions. It is characterized by having. Examples of such a switch include a main switch of the camera, a back cover switch that is turned on and off in response to opening and closing of the back cover, and a forced rewind switch for forcibly rewinding the film.

[0014]

[Function] When the focal length is maximized during the zoom operation,
That is, when the front lens group is moved to the telephoto end, the rear lens group is located closest to the home position. Therefore, in the present invention, at this time, the rear group lens is moved to the home position, and the home position check is performed.

If an abnormality is detected in the home position check, only predetermined switches such as a main switch are made to function, and the input of other switches is invalidated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

The two-unit zoom device of the camera to which the present invention is applied is the same as that described above with reference to FIG. 1, but in order to further clarify the contents of the present invention, the structure thereof will be described. It will be described in detail.

The lens barrel 4 of the zoom device 2 includes a fixed barrel 6 forming a part of a camera body, an intermediate barrel 8 nested in the fixed barrel 6, and a nested barrel in the intermediate barrel 8. And a movable cylinder 10 housed in the three-stage configuration.

A spiral groove 12 is formed on the inner surface of the fixed cylinder 6, and an engagement portion 14 provided on the outer surface of the distal end of the intermediate cylinder 8 is formed.
Are engaged with the spiral groove 12. The intermediate cylinder 8 is rotatable in both forward and reverse directions via a transmission mechanism 16 by a direct current motor (not shown), and is expanded and contracted with respect to the fixed cylinder 6 by the rotation.

A spiral groove 18 is also formed on the inner surface of the intermediate cylinder 8, and an engaging portion 20 on the outer surface of the distal end of the movable cylinder 10 is engaged with the spiral groove 18. Since the movable cylinder 10 cannot rotate with respect to the fixed cylinder 6, when the intermediate cylinder 8 is rotated, the movable cylinder 10 expands and contracts in the same direction as the expansion and contraction of the intermediate cylinder 8.

A front lens group 22 is fixed to the tip of the movable barrel 10. Therefore, by controlling the drive of the DC motor to extend and contract the intermediate cylinder 8 and the movable cylinder 10, the front group lens 22 is moved back and forth. Therefore, this DC motor functions as a driving motor for the front group lens 22.
Reference numeral 24 denotes a position sensor which detects the position of the movable member 26 which moves integrally with the intermediate cylinder 8, but the position of the front lens group 22 is uniquely determined by the position of the intermediate cylinder 8. Therefore, the position of the front lens group 22 can be detected at any time by the output signal from the position sensor 24.

In the moving barrel 10, a front group lens 22 is provided.
A rear group lens 28 is disposed movably back and forth (on the camera body side). Although not clearly shown in FIG.
A two-phase stepping motor is disposed inside the movable barrel 10 as a rear group lens driving motor, and a feed screw 30 connected to a rotation shaft of the stepping motor has
Female screw member 34 integral with lens frame 32 of rear lens group 28
Is screwed. Therefore, by controlling the driving of the stepping motor, the rear group lens 28 is moved back and forth.

The rear lens group 28 has a home position at the position closest to the front lens group 22, and the movable barrel 1
A home position sensor (not shown) for detecting that the rear group lens 28 is at the home position is provided in the area 0. The position of the rear group lens 28 is calculated based on the cumulative number of pulse signals applied to the stepping motor with reference to the home position. Various types of home position sensors can be used. In this embodiment, a limit switch is used and the rear lens group 28 is used.
This limit switch is turned on when is placed at the home position.

As shown in FIG. 2, the control device of the camera having such a zoom device 2 is constituted mainly by a CPU 40. A DC motor 42 for driving the front lens group 22 or the lens barrel 4 and a stepping motor 44 for driving the rear lens group 28 are provided to the CPU 40 by logic.
It is connected via a driver circuit 46. logic·
The driver circuit 46 responds to a signal from the CPU 40,
By appropriately applying a high voltage and a low voltage to the DC motor 42, the rotation and brake of the motor 42 can be controlled. In addition, a pulse signal is issued from the CPU 40 to the stepping motor 44 according to the excitation patterns shown in the following table, and the A phase and the B phase of the stepping motor 44 are appropriately excited.

In the table below, the rear group pointer is RAM data, and the CPU 40
To move 8 to the next phase, each phase of the stepping motor 44 is excited with an excitation pattern corresponding to the value of the rear group pointer. FIG. 3 is a conceptual diagram of the configuration and operation of the stepping motor 44 used in the camera of this embodiment. FIGS. 3A to 3D respectively show “0” to “3” of the rear group pointer. The state is shown. As will be understood from FIG. 3, when the value of the rear group pointer increases from “0” to “3” by one point and a pulse signal is output in a cyclic pattern that returns to “0” again, the stepping motor 4
The rotator 45 of the fourth group rotates in the forward direction, and the rear group lens 28
Moves backward, that is, in a direction away from the front lens group 22. Also, in a circulating pattern in which the value of the rear group pointer decreases by one point from “3” to “0” and returns to “3” again, the stepping motor 44 rotates in the reverse direction,
The rear lens group 28 moves forward. The states shown in FIGS. 3A and 3C are called a static stable state. Even if the excitation is stopped in this state, the rotor 45 is in a stable state and does not rotate unless an external force is applied. On the other hand, the states shown in FIGS. 3B and 3D are called dynamic stable states because the rotor 45 rotates to the position shown in FIGS. 3A and 3C when the excitation is stopped.

[0026]

[Table 1]

A switch unit 48 is connected to the CPU 40. The switch unit 48 includes a main switch (SM), a back cover switch (SB), a release switch (SP1, SP2) linked with a shutter button, a self-timer switch (SSELF), a strobe mode switch (SMODE), a forced rewind switch. (SMR), an INF switch (SINF) for taking a distant view, and a zoom switch (STEL) for performing a zoom operation to the telephoto side.
E), a zoom switch (SWIDE) for performing a zoom operation on the wide angle side is included, and ON / OFF signals of these switches are input to the CPU 40.

Further, the CPU 4 includes a position sensor 24 for detecting the position of the front lens group 22 and a home position sensor 36 for detecting the home position of the rear lens group 28.
Connected to 0.

Further, a battery 50 is connected to the CPU 40 via a regulator circuit (REG circuit) 52. The battery 50 also functions as a drive power supply for the zoom device 2. A battery check circuit (BC circuit) 54 is connected to the battery 50,
A battery check such as the voltage of the battery 50 is performed by a control signal from the controller 40, and the information is input to the CPU 40.

Next, the control for checking the home position according to the present invention will be described with reference to FIGS.

First, FIG. 4 is a flow chart from when the film is loaded in the camera to when the film reaches a standby state (capturable state). That is, the main switch (SM) is set to O
N (step 101), the back cover is closed and the back cover switch (SB) is ON (step 102), and the forced rewind switch (SMR) is OFF (Step 103), the shutter button is not pressed and the release switch (SP1) is turned off (Step 104), the telephoto zoom switch (STELE) is turned off (Step 105), and the wide angle Zoom switch (SWID)
E) is OFF (step 106), the self-timer switch (SSELF) is OFF (step 107), and the strobe mode switch (SMODE) is OFF (step 1).
08), it is sequentially determined that the INF switch (SINF) is OFF (step 109), and if all the above conditions are satisfied, the camera is set to the standby state. Once in the standby state, step 101
Step 109 is repeated.

If the telephoto zoom switch (STELE) is pressed after the camera is set to the standby state in this way, the telephoto zoom processing shown in detail in FIG. 5 is executed (step 110).

In this telephoto-side zoom process, first, a battery check (BC) process is performed to
Is measured (step 201), and it is determined whether the voltage is equal to or less than a predetermined value (step 202). If the voltage is equal to or less than the predetermined value, the process proceeds to step 213,
This processing is ended after the telephoto zoom switch (STEL) is turned off.

When the voltage of the battery 50 is higher than a predetermined value,
That is, when it is determined that the position is within the normal range, the position of the front group lens 22 is detected based on a signal from the position sensor 24 (step 203). If it is determined in step 204 that the position of the front lens group 22 is not less than the wide (WIDE) end and not less than the telephoto (TELE) end, it is determined that no further zoom operation is possible, and the process proceeds to step 213. And terminate the processing. That is, when the position of the front lens group 22 is at the telephoto end (the maximum telephoto state shown in FIG. 1A in which the lens barrel 4 is extended the longest), a further zoom operation to the telephoto side is performed. Can not. Further, even in the standby state, the lens may be positioned closer to the camera body than the wide-angle end (the widest angle state shown in FIG. 1B where the lens barrel 4 is most shortened in the standby state). Step 2 because it is considered abnormal
Go to step 13.

When the front group lens 22 is located between the wide end and the telephoto end, the DC motor (front group motor) 42 for driving the front group lens is driven, and the front group lens 22 is moved in the telephoto direction, that is, forward. (Step 205). Then, the driving direction is set to the telephoto direction (TELE) (step 2).
06).

Thereafter, a telephoto zoom switch (STEL)
Until E) is turned off or the front group lens 22 reaches the telephoto end, the driving processing of the rear group lens driving stepping motor 44 (rear group driving processing) and the position detection of the front group lens 22 (front group) (Step 207) is repeated.
To 210). During this time, the DC motor 4 for driving the front group lens
2 is continuously driven.

Here, the rear group driving process will be described with reference to FIG.

First, immediately after the DC motor 42 starts to be driven, the process proceeds from step 301 to step 302 to start a timer, and after a lapse of a predetermined time (100 ms in this embodiment), sets the front group motor drive flag. (Steps 303 and 304). Then, a rear group phase output process is performed so that the stepping motor 44 has a phase corresponding to the value of the rear group pointer written in the RAM (step 305).

In the rear group phase output processing, as shown in FIG. 7, a predetermined pulse signal is output to set the phase of the stepping motor 44 according to the value of the rear group pointer (see FIG. 3). Each phase of the motor 44 is appropriately excited.

Thereafter, the position of the front group lens 22 is detected (step 208), and the rear group driving process is performed again (step 207). Here, since the front group motor drive flag has already been set, steps 301 to 3
It moves to 06,307.

Step 307 is a stepping motor 4
4 is a process for driving N pulses, where N is
06 corresponds to the numerical value set in the rear group drive counter. In this step, since "1" is set in the rear group drive counter, the stepping motor 44 is driven by one pulse, and the rear group lens 28 moves in the telephoto direction by a distance corresponding thereto.

FIG. 8 is a flowchart showing the details of the processing in step 307. In this process, first, since the driving direction is set to the telephoto direction (TELE), the process proceeds from step 401 to step 402.
When the rear group accumulated pulse number corresponding to the position of the rear group lens 28 is “0”, this means that the rear group lens 28 is at the reference position and is at the position closest to the front group lens 22. Therefore, it is determined that no further movement in the telephoto direction is possible, and this processing ends.

On the other hand, if the rear group cumulative pulse number is "1" or more, the rear group lens 28 is moved forward by one pulse, so "1" is subtracted from the rear group cumulative pulse number in advance. (Step 403). Next, “1” is subtracted from the value of the rear group pointer corresponding to the current phase of the stepping motor 44 (step 404), and the subsequent step 407
Drives the stepping motor 44 to the next phase.
If the value of the rear group pointer is negative, "3" is set as the value of the rear group pointer (steps 405, 4).
06).

When a pulse signal corresponding to the value of the rear group pointer is output at step 407, as described above, the rotor 45 of the stepping motor 44 rotates in the reverse direction, and the rear group lens 28 moves in the telephoto direction. Then, after a certain time has elapsed (steps 408 and 409), “1” is subtracted from the value of the rear group drive counter (step 41).
0). As a result, the value of the rear group drive counter becomes “0”, and this processing ends (step 411).

After the rear group drive processing and the front group position detection processing (steps 207 and 208) are repeated and the telephoto zoom switch (STELE) is turned off, the front group lens 22 is moved to a desired position. To reliably stop at the position, a braking process is performed on the DC motor 42 (step 211). Then, first, the rear group driving process (step 20)
The front group motor drive flag set in 7) is cleared (step 212), and the telephoto zoom switch (STELE)
Is turned off (step 21).
3), the telephoto-side zoom processing ends.

On the other hand, according to the present invention, when the front group lens 22 reaches the TELE end, the rear group lens 28
(Steps 209, 214 to 219). In this process, first, in order to surely stop the front lens group 22 at the telephoto end,
Execute front group motor brake processing (step 21)
4). Thereafter, in order to make the stepping motor 44 statically stable, the value of the rear group pointer at that time is detected, and whether or not it is an odd number is detected (step 215).
As described above, in this embodiment, when the value of the rear group pointer is “0” or “2”, the stepping motor 44 is in a static stable state, and when the value is “1” or “3”, it is activated. It becomes a stable state. Therefore, when the value of the rear group pointer is an odd number, that is, “1” or “3”, the rear group driving counter is set to “1” in step 216, and the rear group N pulse driving process is executed in step 217. Then, the stepping motor 44 is driven by one pulse. The subsequent group N pulse drive processing is the processing shown in FIG. When the stepping motor 44 is driven by one pulse in this manner, the stepping motor 44 enters a static stable state.

When the stepping motor 44 is in the static stable state, or when the value of the rear group pointer is "0" or "2" from the beginning and the stepping motor 44 is in the static stable state, the stepping motor 44 is In this state, the next rear group HP driving process is executed (step 21).
8).

The rear group HP driving process is a process of performing a home position check, and as understood from FIG.
The rear lens group 28 is moved to the home position, and if the limit switch serving as the home position sensor is not turned on, it is determined that there is an abnormality, and the HP detection error flag is set. This processing will be described in more detail with reference to FIG.

First, after clearing an HP check drive counter indicating the number of drive processes (rear group N-pulse drive process) applied to the drive stepping motor 44 for the rear group lens 28 (step 501), the rear group is cleared. The driving direction of the stepping motor 44 is set to the reverse direction so that the driving direction of the lens 28 is set to the front group lens 22 side, that is, forward (step 502). Then, the HP detection error flag is also cleared just in case (step 503).

Next, in order to excite the stepping motor 44 with a phase corresponding to the value of the rear group pointer at that time, a rear group phase output process is performed (step 504). In the subsequent step 505, in order to stabilize the excitation state of the stepping motor 44, a waiting time of a predetermined time, about 10 ms in this embodiment, is provided.

Thereafter, processing for driving the stepping motor 44 by N pulses is performed (steps 506 to 50).
8). Here, N corresponds to the numerical value set in the rear group drive counter in step 506. Therefore, in this process, "4" is set in the rear group drive counter, so in the process of FIG. 8, steps 401 to 411 are repeated four times, the stepping motor 44 is driven by four pulses, and the rear group lens 28 Moves forward a distance equivalent to that.

After the end of the group N pulse drive processing, the O of the home position sensor 36
N.OFF is detected (steps 509 to 512). In this embodiment, even if the home position sensor 36 is turned ON for the first time, there is a possibility of malfunction, so ON / OFF of the home position sensor 36 is detected again after 2 ms.

If the home position sensor 36 is off, it is determined whether the value of the HP check drive counter is equal to or less than "180" (step 513). The HP check drive counter is incremented by "1" every time the stepping motor 44 is driven by four pulses (step 507), but the value of this counter is "18".
If it is less than "0", there is a possibility that the rear lens group 28 has not yet reached the home position. this is,
This is because a pulse signal needs to be sent to the stepping motor 44 720 times (180 counters) to move the rear lens group 28 from the position farthest from the home position to the home position. If the home position sensor 36 is OFF and the HP check drive counter is equal to or less than “180”, it can be considered that the rear lens group 28 has not reached the home position. Will repeat. Then, the home position sensor 36 is turned off.
And the HP check drive counter is "180"
Is exceeded, it is considered that there is an abnormality in the driving of the rear group lens 28 and the like, an HP detection error flag is set (step 514), and the process exits.

On the other hand, when the value of the HP check drive counter is within "180", the home position sensor 36 is turned on.
In this case, the rear lens group 28 is moved to a standby position separated from the home position by a few pulses toward the camera body. Here, assuming that the movement is performed by eight pulses, first, the driving direction of the stepping motor 44 is set to the normal rotation direction (step 515), and “8” is set to the rear group drive counter (step 516). Then, after performing the rear group N-pulse driving process (step 517), about 1
After waiting for 0 ms, the excitation state of the stepping motor 44 is stabilized (step 518). In the rear group N pulse driving process, the process proceeds from step 401 of FIG. 8 to step 412, and steps 401 to 411 are repeated eight times.

When the rear lens group 28 is moved to the standby position in this way, if there is no abnormality, the home position sensor 36 is turned off. However, even if the home position sensor 36 is ON / OFF detected twice (steps 519 to 521), if the home position sensor 36 remains ON, it is determined that some abnormality has occurred and the HP detection is performed. An error flag is set (step 514).

If the home position sensor 36 is turned off in steps 519 to 521, this is normal, and the HP detection error flag is not set without setting the HP detection error flag.
Thereafter, the process exits from the group HP driving process.

Thereafter, an abnormality is found in the group HP driving process.
If the HP detection error flag has been set, the process proceeds to error processing (steps 219 and 220). This HP
When the detection flag is set, the operation of the stepping motor 44 and other factors are abnormal, and the RA
Rear lens group 28 obtained from the accumulated pulse number as M data
Is different from the actual position, there is a high possibility that the subject will not be in focus even if exposure processing is performed thereafter. Therefore, in the error processing, as shown in FIG. 10, a switch irrelevant to the shooting processing, for example, a main switch (S
M), only the back cover switch (SB) and the forced rewind switch (SMR) are allowed to function. Accordingly, even if it is possible to turn off the main switch (SM) and store the lens barrel 4 in the camera body, or to forcibly rewind the film to the parttone and take it out of the camera body, the zoom operation and the Exposure and the like cannot be performed.

On the other hand, if the HP detection error flag is not set in the rear group HP drive processing, it is determined that the drive lens 28 is normally driven, and step 219 is executed.
Then, the process proceeds to steps 212 and 213 to return to the standby state.

If the accumulated number of pulses is cleared when the rear lens group 28 is located at the home position in the rear lens group HP driving process, the stepping motor 4
Even if a slight step-out occurs in the front lens 4, the front group lens 22
This is effective because it returns to a normal state each time it reaches the telephoto end.

Although the preferred embodiments of the present invention have been described in detail, it goes without saying that the present invention is not limited to the above embodiments. For example, in the above embodiment, the switches that can function in the error processing are limited to three: the main switch (SM), the back cover switch (SB), and the forced rewind switch (SMR). May be.

In the above embodiment, the stepping motor 4
4 and the DC motor 42 are simultaneously driven, but the stepping motor 44 and the DC motor 42
The present invention is also applicable to a system in which are driven alternately.

[0062]

As described above, according to the present invention, the home position of the rear group lens is checked even during the zoom operation, so that the operation accuracy of the zoom device is improved, and problems such as out of focus are prevented. Can be.

Further, when an abnormality is detected in the home position check, the switches are limited, so that the photographing is not repeated in the abnormal state, so that the deterioration of the failure can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a two-group zoom device of a camera to which the present invention is applied, where (a) is a telephoto state,
(B) shows the widest angle state.

FIG. 2 is a block diagram showing a CPU constituting a control device according to the present invention.

FIG. 3 is a conceptual diagram showing the configuration and operation of a stepping motor for driving a rear lens group of the zoom device.

FIG. 4 is a flowchart illustrating an example of processing until the camera reaches a standby state.

FIG. 5 is a flowchart illustrating an example of a telephoto-side zoom process performed by the control device according to the present invention.

FIG. 6 is a flowchart illustrating an example of a rear group driving process executed by the control device of the present invention.

FIG. 7 is a flowchart showing one embodiment of a rear group phase output process executed by the control device of the present invention.

FIG. 8 is a flowchart showing an embodiment of a rear group N-pulse driving process executed by the control device of the present invention.

FIG. 9 is a flowchart showing an embodiment of a rear group HP driving process executed by the control device of the present invention.

FIG. 10 is a flowchart showing an embodiment of an error process executed by the control device of the present invention.

[Explanation of symbols]

2 ... two-group zoom device, 4 ... lens barrel, 6 ... fixed barrel,
8 middle cylinder, 10 moving cylinder, 16 transmission mechanism, 22 front group lens, 24 position sensor, 28 rear group lens, 36 home position sensor, 40 CPU, 4
2 DC motor, 44 stepping motor, 46 logic driver circuit, 48 switch unit, 50 battery, 52 regulator circuit, 54 battery check circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-171409 (JP, A) JP-A-2-2539 (JP, A) JP-A-4-261398 (JP, A) JP-A-6-261 175001 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B ⁷ /02-7/105 G03B 17/04-17/17

Claims (2)

(57) [Claims] 1. A zoom device comprising a front group lens and a rear group lens, wherein the rear group lens is driven by a stepping motor, wherein a focal length during a zoom operation is the longest. And control means for controlling the driving of the stepping motor so that the rear group lens is arranged at the home position where the rear group lens is closest to the front group lens. A control device for a camera, comprising: detection means for detecting that the camera is arranged at a position. 2. When the control unit drives the stepping motor, and when the detection unit detects that the rear group lens is not located at the home position, the control unit causes only a predetermined switch to function.
Wherein the predetermined switch, the camera main switch, back cover
Back cover switch and film that turns on and off in response to opening and closing
Consists of a forced rewind switch for forcibly rewinding
Characterized by at least one selected from a group
A control device for a camera according to claim 1.