JP2003050414A - Camera with vibration-proof function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform optimum photographing control in accordance with the state of a shake correction means by simple and inexpensive circuit constitution without increasing the number of parts. SOLUTION: This camera has an action state decision means (210 to 215) for indging whether or not the shake correction means normally acts and for identifying a part which does not normally act when the shake correction means does not normally act, and a control means (216 to 223) for changing the control of the succeeding photographing action according to an obtained result when the action state decision means determines that the shake correction means does not normally act and there exists a part which does not normally act.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a camera with a vibration proof function having a shake correction means.

[0002]

2. Description of the Related Art When a hand-held photograph is taken with a conventional camera, for example, when a lens having a long focal length is used or the shutter speed is slowed, image blurring of a photograph occurs due to camera shake, and the image quality thereof deteriorates. There is. Therefore, in recent cameras, it has been proposed that a part or all of the optical system (lens group) is moved in a direction orthogonal to the optical axis so as to cancel the camera shake to correct the camera shake. .

In a system having a correction optical system of this type, a method of detecting the displacement amount from the center position of the correction optical system and feeding back the displacement amount to accurately control the position of the correction optical system is generally used. It is used.

On the other hand, by omitting the displacement amount detecting means and performing position control in an open loop, a compact and inexpensive camera shake correction system can be provided. For example, even in a lens shutter camera (so-called compact camera), a camera shake correction system can be used. It is possible to build.

In general, the correction optical system is different from the previous direction in the pitch direction and the yaw direction from the center of the photographing optical axis, or in a direction perpendicular to the photographing optical axis, and also in the direction perpendicular to the photographing optical axis. By arranging two sets of magnets and coils so that they are displaced in different directions, such as different directions (for example, different by 90 °), and energizing each of these two coils, it is possible to displace them in the respective directions. The structure is such that it can move freely in a plane perpendicular to the axis.

During the correction operation, the correction optical system is displaced in the optimum direction according to the output of the camera shake detection sensor, thereby controlling the fluctuation of the optical axis to the minimum.

Many proposals have been made for countermeasures against abnormal operations of these image stabilization systems.
Japanese Patent Application Laid-Open No. 5-18118 discloses a determination device and determination method for determining whether or not the camera shake detection sensor itself is operating normally.
Published in No. 0. In addition, JP-A-7-159841
The publication discloses a configuration in which normal shooting can be performed when an abnormality occurs only in the image stabilizing apparatus.

However, in the case of an open-loop control, that is, a system which performs control without detecting the current displacement amount of the correction optical system, whether the correction optical system is operating properly according to the drive amount, that is, If an accident such as disconnection of the drive circuit occurs, or if the correction optical system, which should normally be able to move freely in the plane, is stuck for some reason, such as dust or damaged parts, and cannot move. If things happen, it is impossible to judge them.

To deal with such an accident, for example, in Japanese Patent Laid-Open No. 4-215625, when dust adheres to the bearing of the correction optical system and the operation becomes uncomfortable, it is excited to drop the dust. The way it works is shown.

In order to solve such a problem, while the correction optical system is controlled by an open loop, the correction optical system operates normally with a simple structure by detecting the displacement amount of the correction optical system necessary for feedback control. There is proposed a so-called accident detection device that determines only whether or not the accident is occurring.

When confirming the operation of the correction optical system, one of the two driving coils (in the pitch direction and the yaw direction) is energized. Power is applied so that it oscillates in both forward and reverse directions at several tens of Hz. At this time, the driving natural frequencies interfere with each other in the driving direction. By utilizing this interference, the correction optical system vibrates in a specific direction at several tens of Hz. At this time, an induced electromotive force is generated between the magnet and the coil on the side of the coil which is not driven due to the vibration of the correction optical system. That is, the output voltage is generated at both ends of the coil that is not driven in this state in synchronization with the other drive signal.

Alternatively, this energization is stopped after the energization of one of the drive coils for a certain period of time. The correction optical system oscillates in a specific direction at several tens of Hz, and the vibration does not immediately stop even when the energization is stopped. There is also proposed a method of detecting an induced electromotive force appearing in a coil that has been driven until now in the vibration state after the stop of energization.

The coil on the drive side is broken and the coil cannot be energized normally, the coil on the detection side is broken, and the signal output cannot be detected, or the correction optical system causes some physical cause. This voltage can be detected as long as there is no accident that the device cannot operate normally (for example, the operation is limited due to dust adhering to the bearing or the like).

[0014]

However, considering the types of accidents and the detection results in this case, (1) the drive coil is normally energized, but the correction optical system has some physical cause. (For example, dust adheres to the bearings and the operation is limited.) Operation cannot be performed normally. (2) The drive side coil is broken, or the drive driver itself is not normally controlled, and the drive coil is not normally energized, so that it cannot operate normally. It can be roughly classified into two types.

In the case of the above (1), it can be determined that the correction optical system does not operate and the correction optical system cannot physically operate even though the drive coil is energized.

At this time, there is a very high possibility that the optical axis of the photographing optical system is extremely abnormal depending on the position of the correction optical system. Especially in a lens shutter camera, it is assumed that the finder field of view and the shooting range do not match, and there is a risk of vignetting on the shooting screen, or extreme deterioration of optical performance. I want to warn the user and prohibit subsequent shooting operations.

On the other hand, in the case of the above (2), the above (1)
There is a possibility that the same thing as in the case of 1. occurs, but there is a high possibility that the correction optical system is correctly stopped at the center of the optical axis simply by not being energized. At this time, although the camera shake correction operation cannot be performed, only the normal shooting is possible, and the operation of prohibiting the shooting operation should be prevented as much as possible.

However, it is not possible to distinguish between the above states (1) and (2) only by the conventional countermeasures by detecting an accident, and in any case, if the detection result is not normal, the photographing operation is prohibited. There was nothing better than

(Object of the Invention) An object of the present invention is to provide an image stabilization function that can perform optimum photographing control according to the state of the shake correction means with a simple and inexpensive circuit configuration without increasing the number of parts. It aims to provide a camera with functions.

[0020]

In order to achieve the above object, the inventions according to claims 1 to 7 and 14 provide a shake detecting means for detecting shake generated in a camera and an output of the shake detecting means. Accordingly, in a camera with an anti-vibration function having a shake correction unit for correcting the image shake caused by the shake, whether or not the shake correction unit is normally operating, and Is an operation state determining unit that identifies a part that is not operating normally, and if the shake correction unit is not operating normally by the operation state determining unit and a part that is not operating normally is identified, A camera with a vibration isolation function having a control means for changing the control of the subsequent photographing operation according to the result.

Specifically, if the operation state determining means determines that the circuit system is not operating normally due to a defect in the circuit system, the shake correcting operation by the shake correcting means is prohibited. The shooting operation is continued, and if the correction optical system is not operating normally due to a defect, the shake correction operation and subsequent shooting operations are prohibited.

In order to achieve the above-mentioned object, the inventions described in claims 8 to 15 are caused by the shake detecting means for detecting the shake generated in the camera, and the shake according to the output of the shake detecting means. A shake correction unit for correcting the image shake is provided, and the shake correction unit includes a correction optical system and a plurality of drive units for driving the correction optical system in two different directions orthogonal to the optical axis of the photographing optical system. In a camera with anti-vibration function including a coil and a magnet, at least one of the plurality of coils of the shake correction unit is energized to detect an electromotive force induced in the energizing coil or a coil other than the energizing coil. Electromotive force detection means, coil energization determination means for determining whether or not the coil is actually energized when at least one of the plurality of coils is energized, and the coil energization determination hand. It is an image stabilization function camera and a control means for controlling the subsequent operation according to the determination result by.

Specifically, when any coil is energized by the coil energization determination means and a predetermined electromotive force is detected by the electromotive force detection means, the shake correction means is used. The image blur correction operation and the subsequent shooting operation are continued. Further, even if it is determined by the coil energization determination means that one of the coils is energized, if a predetermined electromotive force is not detected by the electromotive force detection means in the energized coil, the subsequent photographing is performed. Prohibit operation. Further, when it is determined by the coil energization determination means that none of the coils is energized, the subsequent photographing operation is prohibited regardless of the detection result of the electromotive force detection means. Further, even when the coil energization determination means determines that one coil is not energized, it is determined that the other coil is energized, and the electromotive force is detected. When the predetermined electromotive force can be detected by the means, the subsequent image shake correction operation by the shake correction means is prohibited, but the photographing operation is continued.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the illustrated embodiments.

FIG. 1 is a block diagram showing a circuit configuration of a main part of a lens shutter camera having an image stabilization function according to an embodiment of the present invention.

In the figure, C has a built-in A / D converter.
The PU 4 centrally controls the following components.

1p and 1y are angular velocity sensors in the pitch direction and yaw direction, 2 is a battery voltage detection circuit for detecting the voltage of the battery which is the power source of the camera, and 5 is a film feed for driving and controlling the film feeding. Sending circuit, 6 is a focal length changing device for changing the focal length of the taking lens, 7 is a focal position changing device for focusing the taking lens,
8 is a correction lens drive circuit for changing the optical axis in the pitch direction and the yaw direction to cancel the influence of the change of the optical axis due to the camera shake of the photographing lens, 9 is a photometric circuit for measuring the brightness of the object, and 10 is up to Distance measuring circuit for measuring distance, 1
1 is an exposure device for performing appropriate exposure on the film, 12
Is a display device for displaying various information, 13 is an operation switch detection device, 14 is a reference voltage, 15 is a first switch part, 16 is a second switch part, and 17 is a first coil for driving a correction lens. , 18 is a second coil for driving the correction lens, and L is a correction lens forming a part of the photographing optical system.

Next, the photographing operation of the camera having the above structure will be described with reference to the flowchart of FIG.

In FIG. 2, first in step 101,
When the operation switch detection device 13 detects that the first stroke of the release button (hereinafter, this switch is referred to as SW1) is pressed, the CPU 4 first determines in step 10
At 2, the angular velocity sensors 1p and 1y are turned on.

After step 103, the CPU 4 starts A / D conversion of this sensor output and performs known digital filter processing.

Since the frequency band of the camera shake signal is about 1 to 10 Hz, its cutoff frequency is a very low frequency of 1 Hz or less. In such a filtering process, it takes a considerable time for the circuit to stabilize after the start of energization. Further, based on this result, it is necessary to perform a known digital integration calculation after step 104 to calculate the angular displacement from the angular velocity signal. The same applies to this integral calculation, and it takes a considerable time for the integration result to stabilize. Therefore, the power of this circuit block is first turned on. Of course, various methods are conceivable for controlling the power supply of this circuit block, but here, for simplicity, the power supply is turned on by the first stroke of the release switch.

In the next steps 105 and 106, the photometry circuit 9 and the distance measurement circuit 10 are operated to measure the brightness and distance of the subject. In the following step 107, the current focal length of the taking lens is read through the focal length changing device 6, and in accordance with this information, in the next step 108,
The focus position changing device 7 controls the focus position of the taking lens so that the focus position is adjusted to an appropriate focus position. Further, depending on the result of the photometric circuit 9, an instruction for charging the strobe circuit or the like is given in order to operate the strobe circuit (not shown).

In this embodiment, since it is supposed to be used in a lens shutter camera, the correction optical system (meaning the correction lens L and its mechanical member such as its supporting member) is not turned on when the switch SW1 is turned on. Do not drive.

In this state, the photographer presses the second release button
When it is detected in step 109 that the stroke (hereinafter, referred to as switch SW2) is pressed, the CPU 4 drives the correction lens L to drive the correction lens L so as to correct the camera shake according to the output of the integration calculation after step 110. This is done through the circuit 8. Thereafter, in step 111, the photometric result obtained previously, the focal length and the open F value of the photographing lens obtained by the focal length changing device 6, or the sensitivity information unique to the film obtained by the film feeding device 5 Based on the above, the exposure device 11 is driven to obtain an appropriate exposure.

During exposure, the following procedure is executed in order to correct the camera shake of the photographer by the photographing optical system.

That is, the angular velocity signals output from the angular velocity sensors 1p and 1y are input to the A / D converter of the CPU 4.
The CPU 4 first performs digital filter processing that realizes a high-pass filter and a low-pass filter. A high-pass filter removes components below the camera shake frequency (sensor drift components, etc.), and a low-pass filter removes high-frequency noise components.

An integral calculation is performed on the result thus obtained. Then, by integrating the angular velocity signal of the camera shake signal, the camera shake angle can be known. Based on the angle signal which is the output of this integration calculation, the CPU 4 drives the correction lens drive circuit 8 so as to drive the correction optical system in the photographing lens so as to cancel this camera shake.

By such processing, it is possible to prevent the deterioration of the image exposed by the camera shake caused by the camera shake.

When appropriate exposure has been made in step 111, the correction lens drive circuit 8 stops driving the correction optical system in step 112. Then step 11
At 3, a so-called reset operation is performed to drive the position of the taking lens so as to return to the initial reference position. Then, in the next step 114, the film feeding device 5 winds the film by a predetermined amount, and the predetermined one-frame shooting operation is completed.

Before the switch SW2 is pressed in step 109, the switch S is switched in step 115.
If it is detected that W1 is released, step 116
Then, the reset operation is performed so that the position of the photographing lens returns to the initial reference position.

In any case, the angular velocity sensors 1p and 1y
The output A / D, filter processing, and integration processing are kept operating until the predetermined time elapses without operating the release switch so that the stabilization time is minimized when the release switch is pressed next time. And

As described above, in the above embodiment, the angular velocity sensor 1 which is the shake detecting means does not have the means for detecting the displacement amount of the correction optical system.
Based on the signals obtained by p and 1y, so-called open-loop control is performed in which a predetermined output is transmitted. In such a configuration, it is generally possible to reduce the scale of the control / detection circuit, and the control is easy.

On the other hand, on the other hand, there is a problem in that it is impossible to determine whether or not the device is operating correctly as originally intended.

Therefore, in the present embodiment, the following circuit structure is used as means for confirming the operation with a circuit size much smaller than the means for detecting the displacement amount of the correction optical system. There is.

That is, the first coil 17 is connected to the A of the CPU 4.
The first switch unit 15 connected to the / D conversion input terminal and the second switch unit 16 connecting the second coil 18 to the A / D conversion input terminal of the CPU 4 are provided. As a result, one end of the first coil 17 is connected to the reference voltage source 14, and the other end is connected to the input terminal of the A / D converter built in the CPU 4. Further, one end of the second coil 18 is also connected to the reference voltage source 14, and the other end is also connected to the input terminal of the A / D converter.

The first and second switch portions 15 and 16
Is an essential component because the correction optical system cannot be normally driven if the correction optical system is still connected to the A / D conversion input terminal of the CPU 4 when the correction optical system is driven.

These first and second switch parts 15, 1
6 is the first coil 17 and A of the CPU 4 during normal operation.
When the operation is confirmed, the CP is cut off between the / D conversion input terminals.
The CP should be connected to the U4 A / D conversion input terminal.
U4 controls.

Next, the operation confirmation will be described.

Prior to the control of the correction optical system during camera shake correction, it is determined whether or not the correction optical system is operating properly. Since this causes a time lag if it is performed each time the correction optical system is driven, it is optimal to actually perform it once at appropriate intervals, for example, when the power of the camera is turned on.

First, the first and second switch portions 15 and 16
In any of the above cases, the first coil 17 is energized. Here, electricity is applied in both forward and reverse directions at a frequency close to the natural frequency of the mechanical section of the correction optical system. The energization is stopped after energizing for a sufficient time for the mechanical unit to respond. At this time, the correction lens drive circuit 8 sets its output to HZ (high impedance state) and sets the drive coil in a floating state.

Thereafter, the first switch section 15 is controlled to be turned on, and one end of the first coil 17 which has been driven so far is connected to the reference voltage 14, and the other end is connected to the A / D conversion input terminal of the CPU 4. To do.

At this time, if the correction optical system is operating normally, it is still vibrating near the natural frequency, and at this time, an induced electromotive force is generated between the magnet and the driving coil which face each other. The voltage is an output voltage that oscillates around the output voltage of the reference voltage 14 at an oscillating frequency.

This state is shown in FIG.

In the figure, 301 is the output of one output terminal of the correction lens drive circuit 8, and 302 is the output of the other corresponding end.

The output terminal is alternately energized to H and L to full power. At this time, this drive frequency is set to a frequency close to the natural frequency of the correction optical system. Then, the correction optical system makes a full swing at this frequency, and vibrates at almost the natural frequency.

Here, the correction lens drive circuit 8 stops its energization, and its output terminal becomes high impedance (HZ).
When set to the state of, the correction optical system vibrates at its natural frequency, and eventually that vibration also attenuates,
Then stop at the center position.

After the driving is stopped, the first switch section 15 is controlled to connect one end to the reference voltage 14 and the other end to the A / D conversion input terminal of the CPU 4. At this time, the voltage appearing at the A / D conversion input terminal becomes like 303.

The CPU 4 detects this voltage waveform with the A / D converter, and when a signal representing a predetermined damped oscillation state is observed, it is determined that the correction optical system is operating normally. For example, first, it is determined whether the output amplitude is equal to or greater than a predetermined value, and whether the oscillation frequency of the output voltage is an output close to the drive signal (or the natural frequency),
It can be determined by confirming.

Further, similarly, the first and second switch units 1
In a state in which both 5 and 16 are off, energization of the second coil 18 is started, and after energizing for a sufficient time for the mechanism section to respond, energization is stopped and the second switch section 16 is turned on. Then, one end of the second coil 18 that has been driven so far is connected to the reference voltage 14, and the other end is connected to the A / D conversion input terminal of the CPU 4, and the correction optics is based on the A / D conversion result at this time. Judging whether the system is operating normally.

In the unlikely event that there is an abnormality, none of the detection results will appear normally, and it is very unlikely that one output result will appear normally despite the abnormality. Therefore, normally, by controlling only one of the coils, it can be sufficiently determined whether or not the correction optical system is operating normally.

If the correction optical system cannot operate normally due to some physical cause (for example, the operation is limited due to dust adhering to the bearing or the like), the correction optical system is energized to vibrate it. Since it does not operate, and therefore its output does not change even after the energization is stopped, the output voltage remains the reference voltage.

When the drive coil is disconnected between the output terminal of the correction lens drive circuit 8 (correctly, between the branch point with the switch section and the drive coil) and the coil cannot be energized normally, However, even if it is energized so that it vibrates, it does not operate, and its output does not change even after the energization is stopped, so the output voltage remains the reference voltage.

In this case, it is possible to disconnect the wire by judging whether or not the drive coil is normally energized.
It is possible to judge whether the output does not appear because the current cannot be supplied normally or the output does not appear because the correction optical system is fixed.

However, in order to measure the current in the output loop of the correction lens drive circuit 8, it is necessary to insert a detection resistor in the drive loop, and the loss due to this is
In a compact camera or the like that uses a small battery, the effect is so great that it is not practical.

Therefore, in the present embodiment, it is determined that the drive coil can be normally energized by detecting the change in the battery voltage before and after energization, so that the wire is normally disconnected. It is determined whether the output does not appear because the power cannot be supplied, or the output does not appear because the correction optical system is stuck due to dust or the like, and the operation of the camera is switched based on the detection result.

The above description will be described with reference to the flowchart shown in FIG.

In the present embodiment, for the sake of simplification, the operation of the correction optical system will be checked every time the release button is pressed.

In step 102 of FIG. 2, the angular velocity sensor 1
After the energization of p and 1y is started, the process proceeds to the flow chart shown in FIG. 3 via to confirm the operation of the correction optical system.

In FIG. 3, first, at step 201, the output signal of the battery voltage detection circuit 2 is A / D converted by the CPU 4, and the information of the battery voltage is read. Based on the initial battery voltage data obtained in this way, operation determination is performed in step 204 and subsequent steps. In the next step 202, energization of the first coil 17 is started. The correction lens drive circuit 8 is controlled so that the correction optical system is energized in both forward and reverse directions at a frequency close to the natural frequency so that the correction optical system vibrates sufficiently at the natural frequency.

During energization, a period during which the energization is stable is selected, and in step 203, the output A / A of the battery voltage detection circuit 2 is selected.
Perform D conversion. This makes it possible to detect the state of the battery voltage during energization.

The energizing current is substantially determined by the voltage of the battery and the resistance of the energizing circuit system of the driving coil, and when this current flows, the battery voltage drops in proportion to the internal resistance of the battery. The battery voltage obtained here is used in Step 20.
In step 4, the result is compared with the A / D conversion result of the battery voltage detection circuit 2 measured in step 201 before being energized. If there is a change of a predetermined value or more as compared with the detection result measured in step 201, it is determined that the electricity is normally supplied. On the other hand, when the amount of change is not equal to or greater than the predetermined value set in advance, it is determined that the power supply is not normally performed.

After a sufficient time has passed so that the correction optical system vibrates at its natural frequency, the energization is stopped in step 205. At this time, the correction lens drive circuit 8 brings its output into a high impedance state.

Next, at step 206, the first coil 17
From the original correction lens drive circuit 8, the first switch unit 15 is operated to place a bet for operation confirmation, so that one end of the coil is connected to the reference voltage and the other end is connected to the A / D conversion effective of the CPU 4. Switch.

At this time, since the correction optical system is still vibrating near its natural frequency, an induced voltage is generated between the correction optical system and the magnet in accordance with the vibration. Therefore, immediately in step 207, the voltage generated in the first coil 17 is taken in by the A / D conversion of the CPU 4 for a predetermined time. In the following step 208, the A /
It is determined whether or not the D conversion result has a result (see FIG. 4) such that the D vibration results in a damped oscillation at a frequency close to the natural frequency of the correction optical system with the reference voltage as the center. Similarly, the processes of steps 202 to 208 performed on the first coil 17 are also performed on the second coil 18 in steps 209 to 21.
Perform at 5.

From the result thus obtained, the judgment is made in step 216 and thereafter.

As described above, the first and second coils 17 and 18
On the other hand, since the four items of the check of the energizing current and the check of the output voltage have been confirmed, it is determined in step 216 whether or not the energizing currents of both coils are OK. When it is determined that the check of the energization current of both coils is OK, in step 217, the determination result of the output voltage generated in the coils is confirmed. As a result, if it is determined that all output voltages are output normally, it is determined that all the operations are normal,
The normal sequence from step 103 onward in FIG.

On the other hand, in step 217, if the output voltage of any of the coils is determined to be NG, it is determined that the energization current is normal, so the correction optical system is fixed. Step 2 because it is not possible to guarantee that the optical axis of the image is normal
In step 22, the second warning is displayed on the display device 12, and in step 223, the subsequent shooting operation is prohibited.

When such a phenomenon occurs, it rarely occurs with respect to the output of only one coil, and in most cases, the output of either coil is incorrect. Therefore, only the output voltage of one coil is NG
In the case of, it is possible to take the procedure of checking again.

If it is determined in step 216 that the current supplied to any of the coils is NG, the drive coil is not energized, and there is a circuit problem. The display device 12 is caused to display a warning to inform the user. The display method at this time can be determined by displaying differently from the case where the correction optical system is fixed.

However, in this case, the optical axis of the photographing system cannot always be guaranteed, and in particular, when the output voltage check is passed in either one of the coils,
It is determined that the photographing optical axis is normal, a warning is displayed, only the shake correction operation is prohibited, and the subsequent photographing operations are not prohibited.

Therefore, in step 218, it is determined whether or not the energization checks of both coils are NG, that is, whether or not at least one of the energization checks is OK. Here, if both coils are NG in the energization current check, it is not possible to guess what the photographing optical axis is, so in step 221 the first warning is displayed. In step 223, the subsequent shooting operation is prohibited.

If one of the energizing current checks is OK in step 218, it is determined in step 219 whether the coil output voltage is OK. If it is OK here, the correction lens L cannot be driven, but it is determined that the correction lens L is at the center position on the optical axis, and the first warning is displayed in step 220, and then the Although not shown in FIG. 2, the process proceeds to step 103 of 2 but the operation of driving the correction optical system in the subsequent operation is prohibited.

When the output voltage is determined to be NG in step 219, it is determined that the correction optical system is fixed on this coil side, and in step 222, After displaying the warning 2
In step 223, the subsequent shooting operation is prohibited.

According to the above embodiment, means for energizing at least one of the plurality of coils and detecting an electromotive force induced in the energizing coil or a coil other than the energizing coil (step of FIG. 3). 202-208, 209-21
5) and a means (steps 204 and 211 in FIG. 3) for determining whether or not the coil is actually energized when at least one of the plurality of coils is energized. Is also energized and the predetermined electromotive force can be detected by the electromotive force detecting means, the image blur correction operation and the subsequent photographing operation are continued (step in FIG. 3). 216 → 217
OK).

Further, even if it is determined that any one of the coils is energized, in the energizing coil, as shown in FIG.
When the predetermined electromotive force (with respect to the reference voltage) as shown in (3) is not detected, the subsequent shooting operation is prohibited (NG in step 219 in FIG. 3).

Further, if it is determined that no current is applied to any of the coils, the subsequent photographing operation is prohibited regardless of the detection result of the electromotive force (step of FIG. 3). 218 NG).

Even when it is determined that one coil is not energized, it is determined that the other coil is energized and a predetermined electromotive force can be detected. If so, the subsequent image blur correction operation is prohibited, but the photographing operation is continued (OK in steps 216 → 218 → 219 in FIG. 3).

Therefore, without increasing the number of parts,
With a simple and inexpensive circuit configuration, it is possible to perform optimal shooting control (continue shooting operations, prohibit shooting operations, or prohibit only image blur correction operations) according to the state of failure at that time.

Further, steps 220, 221, and 2 in FIG.
As shown in FIG. 22, different warning displays are displayed depending on whether the coil is not normally energized or when a predetermined electromotive force cannot be detected. Can be easily known.

Whether or not the coil is energized by detecting the difference between the battery voltage before energizing the coil and the battery voltage after energizing the coil as described above (steps 204 and 211 in FIG. 3). Since the configuration determines whether or not there is no increase in the circuit scale.

(Modification) In the above embodiment, the angular velocity sensor is used as the shake detecting means, but the present invention is not limited to this, and various sensors can be similarly used.

In the above embodiment, the operation check is performed every time the release button is pressed. However, if the operation is actually performed, a certain amount of time is required and a shutter time lag is required. It is conceivable that the method is executed once every time the main switch is turned on, or once before the image stabilization operation is first performed after the main switch is turned on.

Further, although the output of the coil is checked by providing the first and second switch parts for both drive coils, one switch part is abolished in order to reduce the circuit scale. The output voltage may be checked for only one of the coils. However, this process is effective because the energizing current check can be performed for any coil regardless of the presence or absence of the switch section. In that case, if the energization check is OK and the output voltage is NG, a warning is displayed and subsequent photographing is prohibited.

Further, in the case of the energization check NG on the coil side having no switch section, a warning is displayed and the shake correction operation is prohibited, but the photographing operation is permitted. Also,
In the case of the power-on check NG on the coil side having the switch portion, it is possible to set such that a warning is displayed and subsequent photographing is prohibited.

[0095]

As described above, according to the present invention,
It is possible to provide a camera with an anti-vibration function that can perform optimal shooting control according to the state of the shake correction means with a simple and inexpensive circuit configuration without increasing the number of parts.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an operation at the time of normal shooting in the camera of one embodiment of the present invention.

FIG. 3 is a flowchart showing an operation confirmation time in the camera of one embodiment of the present invention.

FIG. 4 is a timing chart for explaining induced voltage detection in the camera of one embodiment of the present invention.

[Explanation of symbols]

1p, 1y angular velocity sensor, 2 Battery voltage detection circuit 4 CPU with built-in A / D converter 8 Correction lens drive circuit 11 Exposure equipment 12 Display 13 Operation switch detector 14 Reference voltage 15 First switch section 16 Second switch section 17 First Correction Lens Driving Coil 18 Second Correction Lens Driving Coil

Claims (15)

[Claims] 1. A camera with an anti-vibration function, comprising: shake detection means for detecting shake generated in a camera; and shake correction means for correcting image shake caused by the shake according to the output of the shake detection means. In the above, in the case where the shake correction means is operating normally, and when the shake correction means is not operating normally, an operation state determining means for identifying a portion that is not operating normally, and When the correction means is not operating normally and a part that is not operating normally is specified, the correction means has a control means for changing the control of the subsequent shooting operation according to the result. A camera with anti-vibration function. 2. The shake correction means comprises a correction optical system, and a circuit system having a plurality of coils and magnets for driving the correction optical system in two different directions orthogonal to the optical axis of the photographing optical system. However, the operation state determination means, by determining whether the correction optical system is not operating normally due to a defect, or whether the circuit system is not operating normally due to a defect, 2. The camera with anti-vibration function according to claim 1, wherein the shake correction means identifies a portion that is not operating normally. 3. The control means prohibits a shake correction operation by the shake correction means when the operation state judgment means determines that the circuit system is not operating normally due to a defect in the circuit system. However, the shooting operation is continued, and when it is determined that the correction optical system is not operating normally due to a defect in the correction optical system, the shake correction operation and subsequent shooting operations are prohibited. The camera with a vibration isolation function according to Item 2. 4. The camera with anti-vibration function according to claim 1, further comprising display means for displaying different warnings according to the determination result by the operation state determination means. 5. An electromotive force induced in at least one of the plurality of coils of the shake correction means, and an electromotive force induced in the energizing coil or a coil other than the energizing coil is detected,
5. The camera with anti-vibration function according to claim 1, wherein it is determined whether or not there is a defect in the correction optical system based on whether or not a predetermined electromotive force can be detected. 6. When any one of the plurality of coils of the shake correction means is energized, it is determined whether or not there is a defect in the circuit system depending on whether or not the coil is actually energized. The camera with a vibration proof function according to any one of claims 1 to 5. 7. A method for determining whether or not the coil is energized by detecting a difference between a battery voltage before energizing the coil and a battery voltage after energizing the coil. The camera with an anti-vibration function according to claim 6. 8. A shake correction unit for detecting a shake generated in a camera, and a shake correction unit for correcting an image shake caused by the shake according to an output of the shake detection unit. The means includes a correction optical system and a camera with an anti-vibration function that includes a plurality of coils and magnets for driving the correction optical system in two different directions orthogonal to the optical axis of the photographing optical system. An electromotive force detection unit that energizes at least one of the plurality of coils and detects an electromotive force induced in the energizing coil or another coil other than the energizing coil,
When at least one of the plurality of coils is energized,
With a vibration isolation function, which has a coil energization judging means for judging whether or not the coil is actually energized, and a control means for controlling the subsequent operation according to the judgment result by the coil energization judging means. camera. 9. The shake correction is performed when the coil energization determination unit energizes all of the coils and the electromotive force detection unit can detect a predetermined electromotive force. 9. The image blur correction operation by the means and the subsequent shooting operation are continued.
Camera with anti-vibration function described in. 10. The control means detects a predetermined electromotive force by the electromotive force detection means in the energized coil even if the coil energization determination means determines that one of the coils is energized. The camera with anti-vibration function according to claim 8 or 9, wherein if not performed, the subsequent shooting operation is prohibited. 11. When the coil energization determination unit determines that no coil is energized, the control unit does not depend on the detection result of the electromotive force detection unit, and the subsequent photographing is performed. 11. The camera with a vibration isolation function according to claim 8, wherein the camera is prohibited from operating. 12. The control means determines that the other coil is energized even when the coil energization determination means determines that one coil is not energized. If the predetermined electromotive force is detected by the electromotive force detecting means, the subsequent image blur correcting operation by the blur correcting means is prohibited, but the photographing operation is continued. Item 8
The camera with a vibration isolation function according to any one of 1 to 11. 13. A display means for displaying different warnings according to the detection results of the coil energization determination means and the electromotive force detection means.
A camera with an anti-vibration function according to any one of to 12. 14. The camera with a vibration isolation function according to claim 1, wherein the taking optical system and the finder optical system are independent. 15. The coil energization determination means detects whether or not the coil is energized by detecting a difference between a battery voltage before energizing the coil and the battery voltage after energizing the coil. The camera with an anti-vibration function according to any one of claims 8 to 14, characterized by making a determination.