JP2002055373A - Device for deciding breakdown of shake sensor, and camera system and interchangeable lens equipped with the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for deciding the breakdown of a shake sensor which decides whether the shake sensor is normal or broken down by checking the alignment state of the shake sensor incorporated in an optical device (a camera or a lens or the like), and to provide a camera system and an inter changeable lens equipped with the device. SOLUTION: This device decides the breakdown of the shake sensor 11 incorporated in the optical device 10 in order to detect the shake of the optical device 10, and is equipped with a decision starting means 17 for starting the decision of the breakdown of the sensor 11, a filter means 42 inputting a sensor signal outputted from the sensor 11 and making a signal component in a specified frequency band pass, and a decision means 48 deciding the breakdown of the sensor 11 based on the signal component in a specified time from start of the decision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for determining a failure of a shake sensor for detecting a shake of an optical device (camera, lens, etc.), a camera system including the same, and an interchangeable lens.

[0002]

2. Description of the Related Art Conventionally, in a camera having a built-in shake sensor, a shake sensor detects the shake of the camera during exposure to an image pickup means such as a silver halide film, and based on the output of the shake sensor, one of the photographing optical systems is used. By driving the lens of the unit (shake correction operation), the shake of the subject image according to the shake of the camera is corrected, and a good subject image can be captured by the imaging unit.

[0003]

By the way, the shake sensor has a drawback that, due to its structure, it is vulnerable to external impact. When an excessive impact is applied to the shake sensor from the outside, the alignment is broken and the shake of the camera cannot be accurately detected. If the camera shake cannot be detected with high accuracy, a sufficient result cannot be obtained even if the shake of the subject image is corrected by the above-described shake correction operation. For this reason, the subject image affected by the camera shake is captured by the imaging means.

[0004] In recent years, devices for detecting breakage of the shake sensor have been proposed. For example, in an apparatus disclosed in Japanese Patent Application Laid-Open No. 5-181180, the output of a shake sensor is monitored during a shake correction operation, and if the output does not change for a certain period of time, the message "The shake sensor is broken (abnormal)" Is determined. However, the above-described conventional destruction detection device can detect "abnormality" only when the shake sensor is completely destroyed. That is, it was not possible to detect a state in which the alignment of the shake sensor was lost and the accuracy of shake detection was reduced. As described above, if the shake detection accuracy of the shake sensor is reduced, an effective shake correction effect cannot be already obtained even if the shake sensor is not completely destroyed.

An object of the present invention is to check the alignment of a shake sensor incorporated in an optical device (such as a camera or a lens) to determine whether the shake sensor is normal or faulty. An object of the present invention is to provide a determination device, and a camera system and an interchangeable lens including the same.

[0006]

According to the present invention, there is provided a shake sensor failure judging device for judging a failure of a shake sensor incorporated in an optical device to detect a shake of the optical device. Determination start means for starting the determination of a failure, filter means for inputting a sensor signal output from the shake sensor and passing a signal component in a predetermined frequency band, and a signal component within a predetermined time from the start of the determination. Determining means for determining a failure of the shake sensor. This makes it possible to detect a state in which the alignment of the shake sensor is broken and the shake detection accuracy is reduced.

When the optical device is kept stationary,
The shake sensor incorporated in the optical device is also kept stationary. At this time, the sensor signal output from the shake sensor does not include a shake component. Therefore, the shake component is not included in the signal component from the filter means. In this manner, by determining the failure of the shake sensor based on the signal component that does not include the shake component, it is possible to reliably detect a state in which the alignment of the shake sensor is broken and the shake detection accuracy is reduced.

Further, since the camera system of the present invention includes the shake sensor failure determination device described above, it determines failure of the shake sensor based on a signal component within a predetermined time from the start of the determination, and aligns the shake sensor. Can be detected in a state in which the shake detection accuracy has been reduced due to the collapse of the image. Furthermore, since the interchangeable lens of the present invention includes the above-described device for determining a failure of the shake sensor, similarly, it is possible to detect a state where the alignment of the shake sensor is broken and the shake detection accuracy is reduced.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. This embodiment corresponds to claims 1 to 10. Here, as an example of the optical device,
A camera system having a taking lens and a camera body will be described.

As shown in FIG. 1, a camera system 10 according to the present embodiment incorporates a shake sensor 11 for detecting a shake of the camera system 10. The camera system 10 of the present embodiment has a function of correcting a shake of a subject image according to a shake of the camera system 10 (a shake correction function) and a function of determining a failure of the shake sensor 11 (a failure determination function). Camera system.

The internal configuration of the camera system 10 will be described with reference to FIG. The camera system 10 includes a shake sensor 1
1, the control power supply 12, the amplifier 13, and the correction lens 1
4, a lens driving unit 15, a lens position detecting unit 16,
A failure determination switch 17, an external LCD (liquid crystal display) 18, an LCD drive unit 19, and a control circuit 20 are provided.

FIG. 1 shows a configuration relating to a shake correction function and a failure determination function of the camera system 10.
Illustrations and descriptions of other configurations not directly related to the present invention are omitted. First, each component (11 to 20) of the camera system 10 will be individually described, and then
The shake correction function of the camera system 10 and the failure determination function of the shake sensor 11, which is a feature of the present invention, will be described.

The shake sensor 11 is connected to the camera system 1.
This is a gyro sensor that detects a shake of 0 based on an angular velocity, and operates by receiving power supply from the control power supply 12. The detection result (sensor signal) by the shake sensor 11 is output to the amplifier 13 from the output terminal (Vo). Further, a reference signal is output from the output terminal (Vref) of the shake sensor 11 to the amplifier 13.

The control power supply 12 supplies a voltage (6) of a battery (not shown).
V) and a predetermined stable voltage (3 V)
To the power supply terminal (Vcc). The control power supply 12 is turned on and off by the control circuit 20. When the control power supply 12 is switched from the off state to the on state, the power is supplied to the shake sensor 11 and the shake sensor 11 is started. The switching of the control power supply 12 to the ON state is performed at the time of the shake correction operation of the camera system 10 and at the time of the failure determination operation. Although the details will be described later, switching of the control power supply 12 to the ON state during the failure determination operation is performed by the gyro failure determination unit 48 of the control circuit 20.

The amplifier 13 includes a voltage follower 31
Output terminal of the shake sensor 11 via the inverting amplifier 32
The sensor signal from (Vo) is amplified, and the reference signal from the output terminal (Vref) is amplified via the voltage follower 33. The sensor signal and the reference signal amplified via the amplifier 13 are output to an A / D converter 41 (described later) of the control circuit 20.

The constant voltage (2.5 V) of the regulator 36 is input to the plus input terminal of the inverting amplifier 32 of the amplifier 13 via the voltage dividing circuit 34 and the variable resistor 35. The offset component can be removed from the sensor signal (offset adjustment) by changing the resistance value (0 Ω to 20 kΩ). On the other hand, the correction lens 14
Denotes a part of a lens of a photographing optical system (not shown), and is movable in a direction orthogonal to the optical axis 14a of the photographing optical system. The lens drive unit 15 drives the correction lens 14 in a direction orthogonal to the optical axis 14a based on a drive signal from a drive output unit 47 (described later) of the control circuit 20. The lens position detector 16 detects the current position of the correction lens 14 and outputs the result (position signal) to the A / D converter 41 of the control circuit 20.
(Described later).

The failure determination switch 17 (switch means) outputs an ON signal when the failure determination button 21 shown in the external view of FIG. 2 is operated. The ON signal from the failure determination switch 17 is output to the gyro failure determination unit 4 of the control circuit 20.
8 (described later). The failure determination button 21 is a button operated by the user when the failure determination of the shake sensor 11 is desired. Prior to the operation of the failure determination button 21, the camera system 10 is placed on a stable table 22 and is kept stationary.

The external LCD 18 (output means) displays a result of the failure determination of the shake sensor 11. LCD drive unit 19
Drives the external LCD 18 based on a drive signal from a determination output unit 49 (described later) of the control circuit 20, and outputs
1 is displayed. Now, the control circuit 20
Are an A / D converter 41, a filter operation unit 42, a shake amount operation unit 44, a lens position operation unit 45, a target position operation unit 46, a drive output unit 47, and a gyro failure determination unit 4.
8 and a judgment output unit 49.

The A / D converter 41 includes an amplifier 1
The sensor signal of the analog value amplified in 3 is input, and the sensor signal of a digital value (digital sensor signal) is output. The reference voltage for this A / D conversion is
This is set according to the reference signal from the amplifier 13. Further, the A / D converter 41 is connected to the lens position detector 16.
Is also converted into a digital value (digital position signal). The digital sensor signal from the A / D converter 41 is output to the filter operation unit 42, and the digital position signal is output to the lens position operation unit 45.

The filter operation unit 42 (filter means)
Low-pass filter (LPF) calculation unit 42a and subtraction unit 42
b. The LPF calculation unit 42a has an A / D
The digital sensor signal from the converter 41 is input and 0.1
Blocks frequency components above Hz. That is, a frequency component (low-frequency signal) of 0.1 Hz or less in the digital sensor signal is passed.

The subtraction section 42b receives the digital sensor signal from the A / D converter 41 and the low-frequency signal passed through the LPF calculation section 42a, and outputs a signal corresponding to the difference between the digital sensor signal and the low-frequency signal. Is output. In this way, the difference signal output from the subtraction unit 42b of the filter operation unit 42 becomes a frequency component (signal component) of 0.1 Hz or more in the digital sensor signal from the A / D converter 41. The shake frequency of the camera system 10 is 1 Hz to 15
Hz, the filter operation unit 42 (the subtraction unit 42
The output signal from b) will represent the shake of the camera system 10.

The shake amount calculation unit 44 includes a filter calculation unit 42
The gain adjustment is performed by multiplying the output signal (signal representing the shake of the camera system 10) by a predetermined conversion coefficient, and the normalized shake amount is calculated. The normalized shake amount is output to the target position calculation unit 46 and the gyro failure determination unit 48. On the other hand, the lens position calculation unit 45 receives a digital position signal (a signal representing the current position of the correction lens 14) from the A / D converter 41, multiplies this by a predetermined conversion coefficient, and performs gain adjustment. Calculate the normalized current position.

The target position calculator 46 includes a shake amount calculator 44.
The position (target position) of the correction lens 14 capable of correcting the shake of the subject image in accordance with the shake of the camera system 10 is calculated based on the normalized shake amount from the camera, and the target position and the lens position calculator 45 are calculated. The movement amount and the movement direction of the correction lens 14 are calculated based on the normalized current position from.

The drive output section 47 outputs to the lens drive section 15 a signal (drive signal) indicating the amount and direction of movement of the correction lens 14 calculated by the target position calculation section 46.
Further, the gyro failure determination unit 48 (determination unit) receives the normalized shake amount from the shake amount calculation unit 44 and determines a failure of the shake sensor 11 (described later). Judgment output unit 4
9 outputs a signal (drive signal) representing the result determined by the gyro failure determination section 48 to the LCD drive section 19.

The camera system 1 configured as described above
At 0, when shooting is performed while correcting the shake of the subject image corresponding to the shake of the camera system 10, the control circuit 20 switches the control power supply 12 on at a predetermined timing and starts the shake sensor 11. Runout sensor 1
The sensor signal from 1 is supplied to the amplifier 13, the A / D converter 41,
The data is input to a target position calculator 46 via a filter calculator 42 and a shake amount calculator 44. The target position calculator 46 includes:
The position signal from the lens position detector 16 is also used by the A / D converter 4.
1. Input via the lens position calculation unit 45. The movement amount and movement direction of the correction lens 14 calculated by the target position calculation unit 46 are output from the drive output unit 47 to the lens drive unit 15 as a drive signal. Lens drive unit 15
Drives the correction lens 14 based on a drive signal from the drive output unit 47. Thus, the correction lens 14
Is moved (toward the target position) in a direction to cancel the shake of the subject image corresponding to the shake of the camera system 10 (shake correction operation). Thereby, even if the camera system 10 shakes, a good subject image can be taken.

When the camera system 10 is in a stationary state, the sensor signal from the shake sensor 11 does not include a component corresponding to the shake of the camera system 10.
The difference signal from the filter calculation unit 42 and the output signal (normalized shake amount) from the shake amount calculation unit 44 should show constant values. However, immediately after the start of the shake sensor 11, the signals from the filter calculation unit 42 and the shake amount calculation unit 44 do not become constant values even when the camera system 10 is in a stationary state. This is because the sensor signal immediately after the start of the shake sensor 11 has a drift (1 Hz to 10 H) which is a fluctuation component in the same frequency band as the shake of the camera system 10.
z) is included.

FIG. 3 shows a signal V output from the shake amount calculator 44 when the camera system 10 is kept stationary.
FIG. 6 is a diagram illustrating a time change of 1 (normalized shake amount). The horizontal axis is the time from the time when the shake sensor 11 was started (the operation time Ts of the shake sensor 11). FIG. 3 shows the low-frequency signal V that has passed through the LPF calculation unit 42a.
2 and a time change of the digital sensor signal V3 output from the A / D converter 41 are also shown.

As shown in FIG. 3, the waveform of the signal V1 includes
Immediately after the start of the shake sensor 11 (after about 1 second), a peak (extreme value) due to the drift of the sensor signal appears. The waveform of the signal V1 converges to a substantially constant value after passing the peak.

The waveform of the signal V1 is common regardless of whether the shake sensor 11 is normal or has failed. That is, a peak appears in the signal V1 regardless of whether the shake sensor 11 is normal or has failed. However, the signal V1
Magnitude of the peak (difference between peak value and convergence value) ΔVp
Varies depending on whether the shake sensor 11 is normal or has failed. When the shake sensor 11 is normal, the peak magnitude ΔVp falls within a predetermined range (0.5 deg / sec or less). On the other hand, if the alignment of the shake sensor 11 is broken due to an excessive external impact or the like, the peak magnitude ΔVp increases beyond the above-described predetermined range. By the way, in the case of FIG.
It is about 2 deg / sec, and it can be said that the alignment of the shake sensor 11 is in a good state.

Therefore, the camera system 10 of the present embodiment
Then, the alignment of the shake sensor 11 is determined based on the peak magnitude (the difference between the peak value and the convergence value) ΔVp of the signal V1 output from the shake amount calculation unit 44 when the camera system 10 is kept stationary. Self-check the status,
It is determined whether the shake sensor 11 is normal or has failed.

Next, the operation of the camera system 10 according to the present embodiment for determining a failure of the shake sensor 11 will be described. When the user operates the failure determination button 21 (FIG. 2), the failure determination operation of the shake sensor 11 is executed according to the flowchart shown in FIG. Note that the camera system 10 is mounted on a stable table 22 and kept stationary before the operation of the failure determination button 21. When the camera system 10 shakes, the signal V1 from the shake amount calculation unit 44 includes not only the component caused by the drift of the sensor signal but also the component caused by the shake of the camera system 10, and the signal V1 At (Fig. 3)
Because it cannot be determined.

The gyro failure determination section 48 detects that an ON signal is output from the failure determination switch 17 (S
When the determination in Step 1 becomes Y), the control power supply 12 is switched from the off state to the on state, and the shake sensor 11 is started (S
2). Then, measurement of the time (operation time Ts in FIG. 3) from the time when the shake sensor 11 is started is started (S in FIG. 4).
3).

Then, the gyro failure judging section 48 executes S4
, The operation time Ts of the shake sensor 11 is equal to the predetermined time T
o (for example, 10 seconds) is determined, and if it is within the predetermined time To, the determination process of S5 is performed. Here, the shake sensor 11 started in S2 is at the start time (Ts =
At 0), output of the sensor signal is started. A sensor signal from the shake sensor 11 is input to the gyro failure determination unit 48 via the amplifier 13, the A / D converter 41, the filter calculation unit 42, and the shake amount calculation unit 44.

For this reason, the gyro failure determination section 48
After the start of the shake sensor 11 (Ts = 0), the value (angular velocity value) of the signal V1 from the shake amount calculator 44 is monitored, and the magnitude (absolute value) of the signal V1 is determined to be a predetermined value Verr (for example, 1.0 de).
g / sec) is determined (S5). Note that the signal V1 from the shake amount calculation unit 44 has been adjusted so that the convergence value becomes 0 by offset adjustment using the variable resistor 35 of the amplifier 13. Therefore, the signal V1
The magnitude (| V1 |) of the signal V1 and the predetermined value Verr can be compared without calculating the difference between the value of the signal V1 and the convergence value.

If the magnitude of the signal V1 is equal to or smaller than the predetermined value Verr (the determination in S5 is Y), the gyro failure determination section 48 returns to S4 and checks the elapsed time. As described above, the operation time Ts of the shake sensor 11 is within the predetermined time To (S4 is Y), and the magnitude of the signal V1 is the predetermined value Ver.
As long as it is equal to or less than r (S5 is Y), the gyro failure determination unit 4
8 repeats the determination processing of S4 and S5.

The predetermined time To in S4 is set according to the output characteristics of the shake sensor 11. Normally, the drift of the sensor signal output from the shake sensor 11 appears during a period of 10 seconds from the start time (Ts = 0), so the predetermined time To is set to 10 seconds here. The predetermined value Verr in S5 is set according to the resolution of the shake sensor 11. It is preferable to set a value corresponding to ten times the resolution of the shake sensor 11 as the predetermined value Verr.
Usually, the resolution of the shake sensor 11 is about 0.1 deg / sec, so the predetermined value Verr is set to 1.0 deg / sec here.

The gyro failure determination section 48 repeats the above-described determination processing of S4 and S5, and when the magnitude of the signal V1 is equal to or smaller than the predetermined value Verr (S5 is Y), the operation time Ts of the vibration sensor 11 is set to the predetermined time To. (S4 is N),
That is, when the peak magnitude ΔVp (FIG. 3) of the signal V1 is smaller than the predetermined value Verr, it is determined that “the shake sensor 11 is normal” (S6), and the determination result is output to the determination output unit 49.
Output to

The result of the determination that “the shake sensor 11 is normal” is displayed on the external LCD 18 via the determination output unit 49 and the LCD drive unit 19. In this case, the shooting by the above-described shake correction operation is performed favorably. On the other hand, the gyro failure determination unit 48 repeats the above-described determination processing of S4 and S5, and before the operation time Ts of the shake sensor 11 reaches the predetermined time To (S4 remains Y), the magnitude of the signal V1 becomes predetermined. If the value exceeds the value Verr (S5 is N), that is, if the peak magnitude ΔVp (FIG. 3) of the signal V1 is larger than the predetermined value Verr, “the shake sensor 11 is out of order (the alignment is broken)”. (S7), and outputs the determination result to the determination output unit 49.

The determination result that “the shake sensor 11 is out of order” is also displayed on the external LCD 18 via the determination output unit 49 and the LCD drive unit 19. Furthermore, "the shake sensor 11 is out of order (the alignment is broken)."
Is determined, the gyro failure determination unit 48 outputs a control signal for prohibiting the above-described shake correction operation to the drive output unit 47 in S8. As a result, the drive output unit 47 is switched to a mode in which no drive signal is output to the lens drive unit 15. By the way, the correction lens 14
Are kept locked at the default position on the optical axis 14a (the position where the imaging performance is the best).

As described above, according to the camera system 10 of the present embodiment, it is possible to avoid the execution of the shake correction operation in a state where the alignment of the shake sensor 11 is lost and the accuracy of the shake detection is reduced. That is, the shake correction operation can be performed only when a highly accurate shake correction effect is obtained. Therefore, the reliability of the camera system 10 for the shake correction operation is improved.

In the above-described embodiment, the shake sensor 11 for detecting the shake of the camera system 10 based on the angular velocity.
(Gyro sensor) has been described as an example, but the present invention is also applicable to a shake sensor that detects shake based on angular acceleration. In the above-described embodiment, the filter operation unit 42a is set to L
Although the PF calculation unit 42a and the subtraction unit 42b are configured, they may be replaced with a single high-pass filter (HPF) calculation unit.

Further, in the above-described embodiment, the offset adjustment for the sensor signal from the shake sensor 11 is not performed during the failure determination operation. However, when the offset of the sensor signal varies depending on the environment such as temperature, the failure determination operation is performed. It is preferable to perform the offset adjustment every time. For example, 100 ms after the start of the shake sensor 11
Until ec elapses, the drift of the sensor signal is still small, and the value of the signal V1 from the shake amount calculation unit 44 is almost equal to the convergence value. Therefore, the signal V1 is monitored by the control circuit 20 (gyro failure determination unit 48). While the amplifier 13
The resistance value of the variable resistor 35 may be automatically adjusted.

In the above-described embodiment, an example in which the failure determination operation of the shake sensor 10 is started by operating the failure determination button 21 has been described. However, another sensor capable of detecting the stationary state of the camera system 10 is provided. If so, the failure determination button 21
Even if is not operated, execution of the failure determination operation can be started when the camera system 10 is kept stationary.

Further, when photographing with the self-timer,
Since the camera system 10 is placed in a stationary state, the failure determination operation of the camera system 10 may be started when the self-timer is started. In this case, a means (for example, a switch) for notifying the gyro failure determination unit 48 that the photographing mode has been set by the self-timer is provided inside the camera system 10.

In the above embodiment, the control circuit 20 divided into functional blocks (41 to 49) has been described as an example. However, the control circuit 20 has a ROM storing a control program for executing the flowchart shown in FIG. Alternatively, it may be configured by a microcomputer having a CPU that executes a ROM control program. Further, in the above embodiment,
Although the shake sensor 11, the amplifier 13, the lens drive unit 15, and the lens position detection unit 16 are provided one by one, the actual shake of the camera system 10 is divided into yaw (horizontal shake) and pitching (vertical shake). Since the components (11, 13, 15, 16) can be considered separately, it is preferable to provide the components (11, 13, 15, 16) for yawing and pitching.

In the above-described embodiment, the result of the determination that “the shake sensor 11 is out of order” is sent to the external LCD 18.
Has been described above, but it is also possible to notify the user by displaying it on the LCD inside the viewfinder or by emitting an alarm sound. Further, in the above-described embodiment, an example has been described in which the shake sensor 11 and the failure determination device are incorporated in the camera system 10 having the photographing lens and the camera body, but the photographing lens and the camera body are separately detachable. In this case, the shake sensor is usually installed on the photographing lens side, and the failure determination device of the shake sensor is installed on the photographing lens side or the camera body side. In this case, the taking lens corresponds to the optical device in the claims.

Here, the photographing lens 50 (interchangeable lens of claim 11) in which the shake sensor and its failure determination device are incorporated will be described with reference to FIG. Shooting lens 50
Is detachable from the camera body 60. Each of the mounting of the taking lens 50 and the camera body 60 includes:
Electrical contacts (not shown) are provided. Each electrical contact
The connection is established by mounting the taking lens 50 on the camera body 60 (the state of FIG. 5).

Now, inside the taking lens 50, a shake sensor 51, a control power supply 52, an amplifier 53, a correction lens 54, a lens driving section 55, a lens position detecting section 56
, A failure determination switch 57, and a control circuit 58. Among them, the shake sensor 51, the amplifier 53, the correction lens 54, the lens drive unit 55, the lens position detection unit 56, and the failure determination switch 57 are the same as the components (11, 13 to 17) of the camera system 10 described above.

The control power supply 52 of the photographing lens 50 is different from the control power supply 12 of the camera system 10 in that a voltage (6 V) is inputted from a battery 62 housed in the camera body 60 via an electric contact (not shown). Although different, the other functions are the same as those of the control power supply 12. The control circuit 58 of the taking lens 50 includes a control circuit 61 in which the determination output unit 49 is provided inside the camera body 60 via an electric contact (not shown).
The configuration is different from the control circuit 20 of the above-described camera system 10 in that it is connected to the control circuit 20. However, other configurations and functions are the same as those of the control circuit 20.

In the photographing lens 50 configured as described above, the failure determination operation of the shake sensor 51 is performed by an external failure determination button by the user (see the failure determination button 21 in FIG. 2).
Is operated according to the flowchart of FIG. 4 described above. Prior to the operation of the failure determination button, the photographing lens 50 is mounted on the camera body 60 and is mounted on a stable table (see the table 22 in FIG. 2) and kept in a stationary state.

The gyro failure judging section 48 performs the processing shown in FIG.
After S1 to S5, when S4 becomes N, it is determined that the shake sensor 51 is normal (S6), and when S5 becomes N, the shake sensor 51 is out of order (the alignment is broken). ) "(S7). Then, in S8, the shake correction operation is prohibited as described above. The determination result of the gyro failure determination unit 48 is output to the determination output unit 4.
9 and output to the control circuit 61 of the camera body 60. The control circuit 61 of the camera body 60 notifies the user of the failure determination result of the shake sensor 51 by issuing a warning sound or displaying the warning sound on the external LCD or the LCD in the viewfinder. When the shake sensor 51 is out of order, the shutter release of the shake correction shooting is prohibited,
Even if the shake correction shooting is set, the shutter release operation is stopped and the shutter release is performed without performing the shake correction.

As described above, by using the above-described photographing lens 50, it is possible to avoid the execution of the shake correction operation in a state where the alignment of the shake sensor 51 is lost and the accuracy of the shake detection is reduced. That is, the shake correction operation can be performed only when a highly accurate shake correction effect is obtained. Therefore, the reliability of the camera system including the photographing lens 50 and the camera body 60 with respect to the shake correction operation is improved.

[0053]

As described above, according to the first to eleventh aspects of the present invention, the failure of the shake sensor is determined based on the signal component within a predetermined time from the start of the determination.
Before the shake sensor is completely destroyed, it is possible to detect a state in which the alignment of the shake sensor is broken and the shake detection accuracy is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an internal configuration of a camera system 10 of the present embodiment.

FIG. 2 is an external view of the camera system 10. FIG.

FIG. 3 is a diagram illustrating an example of a signal V1 output from a shake amount calculation unit 44 when the camera system 10 is stopped.

FIG. 4 is a flowchart of a failure determination operation for the shake sensor 11.

FIG. 5 is a diagram showing an internal configuration of a photographing lens 50.

[Explanation of symbols]

 Reference Signs List 10 Camera system 11, 51 Shake sensor 12, 52 Control power supply 13, 53 Amplifier 14, 54 Correction lens 15, 55 Lens drive unit 16, 56 Lens position detection unit 17, 57 Failure judgment switch 18 External LCD 19 LCD drive unit 20, 58, 61 control circuit 21 failure determination button 22 units 50 shooting lens 60 camera body 62 battery

Claims (11)

[Claims] 1. A failure judging device for judging a failure of a shake sensor incorporated in an optical device to detect a shake of the optical device, comprising: a judgment start means for starting the judgment of the failure; and the shake sensor. Filter means for inputting a sensor signal output from the controller and passing a signal component in a predetermined frequency band; and determining means for determining a failure of the shake sensor based on the signal component within a predetermined time from the start of the determination. A shake sensor failure determination device, comprising: 2. The shake sensor failure determination device according to claim 1, wherein the determination unit determines the failure of the shake sensor based on the signal component when the optical device is in a stationary state. A failure determination device for a shake sensor. 3. The shake sensor failure determination device according to claim 1, wherein the determination unit determines a failure of the shake sensor based on the signal component within a predetermined time after the start of the shake sensor. A failure determination device for a shake sensor, wherein the failure is determined. 4. The shake sensor failure determination device according to claim 1, wherein the determination start unit includes an externally operable switch unit, and the switch unit is operated. A failure determination device for a shake sensor, wherein the failure determination is started when a failure occurs. 5. The shake sensor failure determination device according to claim 1, wherein the determination unit determines the failure of the shake sensor based on a peak value of the signal component. A failure sensor for a shake sensor. 6. The shake sensor failure determination device according to claim 5, wherein the determination unit is configured to determine that the shake sensor detects when the peak value exceeds a predetermined value corresponding to ten times the resolution of the shake sensor. A failure determination device for a shake sensor, which determines that a failure has occurred. 7. The shake sensor failure determination device according to claim 1, wherein the filter means is a means for passing a frequency component of the shake of the optical device. A failure determination device for a shake sensor. 8. The apparatus according to claim 7, wherein said filter means passes through a low-pass filter that passes low-frequency components of 0.1 Hz or less, and passes through said low-pass filter. An apparatus for determining a failure of a shake sensor, comprising a subtraction unit for determining a difference between a low-frequency component and a signal input to the filter means. 9. The shake sensor failure determination device according to claim 1, further comprising an output unit that outputs a result of the determination by the determination unit to the outside. A failure determination device for a shake sensor. 10. A camera system comprising the shake sensor failure determination device according to claim 1. Description: 11. An interchangeable lens comprising the shake sensor failure determination device according to claim 1. Description: