JP2002236302A - Vibration detector and image blurring correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform accurate vibration detection by avoiding the saturation of the output of a vibration detecting means. SOLUTION: A vibration detector is provided with: a means which detects vibrations; a means which outputs correction voltage; a comparison means which outputs the difference of the outputs of the vibration detecting means and the correction voltage output means; an offset removing means which removes the offset component of the output of the vibration detecting means by controlling the correction voltage output on the basis of the output of the comparison means; and a control means (#109, #111) which controls the offset removing means so that it functions again if the output of the comparison means after once operating the offset removing means is not settled in a predetermined judgment range in a predetermined judgment time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration detecting device having a vibration detecting means for detecting vibration and an improvement of an image blur correcting device.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an apparatus for stabilizing an image by correcting shake of an optical system such as a camera, that is, suppressing vibration due to hand shake or the like. As a typical one of the shake correction methods used for a camera or the like, a part or all of an imaging optical system is driven based on shake information of a camera detected by a shake sensor, and the This is to suppress image blur.

Here, an angular velocity sensor or an acceleration sensor is generally used as the shake sensor.
Since such an angular velocity sensor or acceleration sensor itself outputs only a minute voltage with respect to given vibration,
An appropriate amplifier is provided outside the sensor to output a required voltage. However, sensors that detect such vibrations, especially piezoelectric vibrating gyroscopes commonly used in cameras and the like, have a static output voltage when no vibration is applied (the reference voltage of the sensor and the static output voltage and (Null voltage) greatly changes due to individual variations of the vibrating gyroscope and changes in the use environment, particularly, depending on the use temperature. Therefore, as a problem especially at power-on, when amplifying the output signal to a required voltage, the null voltage is amplified, and the signal becomes saturated particularly when a high gain amplifier is used. Could be

[0004] In order to solve the above problem, as a conventionally disclosed method, there is provided a high-pass filter circuit for cutting, from the output of the angular velocity sensor, a frequency lower than an allowable frequency with respect to the frequency of the vibration to be detected, A method of amplifying a signal that has passed through the high-pass filter circuit with an amplifier is generally adopted.

Further, as an improvement of the above conventional example, Japanese Patent Laid-Open No. 10-2 discloses a vibration detecting device which eliminates a large-capacity capacitor constituting a high-pass filter circuit and is advantageous in cost and mounting.
No. 28043. This is because the output from the vibrating gyroscope is input to a microcomputer through a circuit including a low-pass filter circuit, an adder, and an amplifier circuit, and the microcomputer determines whether an output signal of the circuit exceeds a predetermined level range and is biased with respect to a reference level. Is determined. When the level exceeds the predetermined level range or is deviated from the reference level, a control signal is generated from the microcomputer, and the output of the D / A converter is controlled by the signal. The output of the D / A converter is connected to the adder,
The output signal is adjusted within a predetermined level range and a reference level. With such a configuration, an unstable output at power-on is amplified without saturating to obtain a desired output value.

As an example of a configuration for compensating for an offset component of a sensor using the D / A converter as described above, FIG. 7 shows a conventional example in which an image blur correction device is applied in an interchangeable lens of a single-lens reflex camera. Show.

FIG. 7 is a block diagram showing a specific circuit configuration of a lens microcomputer and a shake correction system as a lens electric system.

The output from the vibrating gyroscope 1, which is an angular velocity sensor for detecting shake, is represented by resistors R1, R2, R
3, the A / A of the lens microcomputer 4 through the amplifying unit 3 including the capacitor C1, the capacitor C2, and the operational amplifier 2.
It is input to the D converter 5. In the amplifying unit 3, the amplification factor is determined by (R3 / R1), and a secondary high-frequency cutoff filter is formed for removing noise. D
The / A converter 7 has two 8-bit D / A converters 7a (D / A
), 7b (D / A) and resistors R4 and R5. A resistor R4 is connected to the output terminal of the D / A converter 7a.
A resistor R5 is connected to the output terminal of the A converter 7b, and the other ends of both resistors are both connected to a non-inverting input terminal of the operational amplifier 2. Here, the resistors R4 and R5
Is set to, for example, about “R4: R5 = 1: 110”. This is determined in consideration of the resolution of the offset compensation control.

At the initial stage of turning on the power, etc., the offset removing means 6 is used for calculating the offset component of the vibrating gyroscope 1.
(Consisting of an output saturation avoidance control unit 6a, a control data storage unit 6b, and a data selection / control unit 6c), and the offset removing means 6 includes D / A converters 7a and D
The output of the / A converter 7b is controlled. The resistance divided outputs of the D / A converters 7a and 7b are connected to the non-inverting input terminal of the operational amplifier 2 of the amplifier 3, and the outputs of the D / A converter 7 are output in accordance with the output of the A / D converter 5. Is controlled, the correction voltage is controlled, and the offset component of the vibration gyro is compensated. Thereafter, the signal is converted into an angular displacement signal via a high-pass filter (HPF) 8 and an integrator 9. Then, the output of the position sensor 10 (via the amplifier 11 and the A / D converter 12) for detecting the position of the correction lens is added in reverse polarity and feedback-calculated, and the signal is output from the output port of the lens microcomputer 4 to the PWM signal. Is output through the PWM signal converter 13 and the correction lens is driven by the coil driver 14 to cancel image blur.

[0010]

FIG. 8 shows a case where large vibration is not applied to the vibrating gyroscope and a stable output ((a) at rest) and a case where large vibration such as panning occurs ((b)). 9 is an example of an output waveform during panning.

In the stationary state shown in FIG. 8A, the output of the vibrating gyroscope is normally + α (or -α: α) with respect to a predetermined reference voltage.
Is an output added with only a null voltage component).
The above-described offset compensation calculation is performed based on this α. However, at the time of panning in FIG.
In addition to the above, + β (or −β) which is a panning component is added. Therefore, when offset compensation is performed in such a state, α + β (or α−β, β−α, −α−
The calculation is performed using β) as a reference value.

That is, when the above-described offset compensation calculation is performed in a panning state or a large shake state by the image blur correction device, the amount of addition of the panning output component and the true sensor offset component is regarded as the sensor offset amount at that time, and the offset is calculated. Since the compensation calculation is performed, if the panning operation or the large swing operation is stopped after the offset compensation calculation is completed, the output may greatly deviate from the target value, and the output may be saturated in some cases.

(Object of the Invention) A first object of the present invention is to provide a vibration detecting device capable of accurately detecting vibration without saturating the output of the vibration detecting means.

A second object of the present invention is that even if the apparatus performs an operation of removing an offset component superimposed on a shake signal in a panning state or a large shake state, the subsequent image shake correction operation is not adversely affected. It is an object to provide an image blur correction device.

[0015]

According to a first aspect of the present invention, there is provided a vibration detecting means for detecting a vibration, a correction voltage output means for outputting a correction voltage, A comparison unit that outputs a difference between the output of the vibration detection unit and the correction voltage output, and controlling the correction voltage output based on the output of the comparison unit to remove an offset component of the output of the vibration detection unit. The output of the comparing means after once operating the offset removing means does not fall within a predetermined determination range within a predetermined determination time. This is a vibration detecting device having control means for operating again.

In order to achieve the second object,
The invention according to claim 2, a vibration detecting means for detecting vibration, a correction voltage output means for outputting a correction voltage, a comparison means for outputting a difference between the output of the vibration detection means and the correction voltage output, In the image blur correction device having an offset removing unit that removes an offset component of the output of the vibration detecting unit by controlling the correction voltage output based on the output of the comparing unit, the offset removing unit is operated. After that, it is determined whether or not the output of the comparing means is within the first determination range within the first determination time. If the output is within the determination condition, an instruction to start the anti-shake operation is issued. If not, a first determination and control means for operating the offset removing means again and again determining whether or not it is within the first determination range within the first determination time, It operates after the operation start instruction, determines whether the output of the comparing means is within the second determination range within the second determination time, and if the output is within the determination conditions, permits the image stabilization operation. If the conditions are not within the determination conditions, the image stabilizing apparatus includes a second determination and control unit that prohibits the start of the image stabilization operation and operates the first determination and control unit again.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a block diagram according to an embodiment of the present invention, in which an image blur correction device is mounted in an interchangeable lens of a single-lens reflex camera as an example.

In FIG. 1, reference numeral 101 denotes a lens microcomputer, and communication contacts 109c (for a clock signal) and 109d (for transmitting a body → lens signal) from the camera body side.
The operation of the shake correction system 102, the focus drive system 104, and the aperture drive system 105 having the configuration as shown in FIG. The shake correction system 102 includes a shake sensor 10 for detecting shake.
6, a position sensor 107 for detecting a correction lens displacement, and
A vibration correction drive system 108 drives a correction lens by a control signal calculated by the lens microcomputer 101 based on the outputs of the vibration sensor 106 and the position sensor 107 to perform a vibration correction operation. Reference numeral 124 (SWIS) denotes an image stabilization switch for selecting a shake correction operation. When the image stabilization operation is selected, the image stabilization switch 124 is turned on.

The focus drive system 104 drives a focus adjusting lens according to a command value from the lens microcomputer 101 to perform focusing. The aperture drive system 1
05 is based on a command value from the lens microcomputer 101,
The operation of reducing the aperture to the set position or returning the aperture to the open state is performed. Also, the lens microcomputer 101
Indicates the state inside the lens (focus position, aperture value, etc.) and information about the lens (open aperture value, focal length,
Data necessary for the distance measurement calculation) to the contact 109e for communication.
It is also transmitted to the body side (for transmission of lens to body signal).

The lens microcomputer 101, the shake correction system 102, the focus drive system 104, and the aperture drive system 105 constitute a lens electric system 110. Then, power is supplied to the lens electric system 110 from a power supply 118 in the camera through a power supply contact 109a and a ground contact 109b.

In the camera body, a distance measuring unit 112, a photometric unit 113, a shutter unit 114, a display unit 115, other control units 116,
And management of these operations such as start and stop, exposure calculation,
A camera microcomputer 117 for performing distance measurement calculation and the like is built in. Power is also supplied to the in-camera electric system 111 from the in-camera power supply 118. Also, 121
(SW1) is a switch for starting photometry and distance measurement, and 122 (SW2) is a release switch for starting a release operation. These are generally two-stage stroke switches, and are release buttons. The switch 121 is turned on in the first stroke, and the release switch 122 is turned on in the second stroke. Reference numeral 123 (SWM) is an exposure mode selection switch. The exposure mode can be changed by turning the switch ON or OFF, or by operating the switch 123 and other operation members simultaneously.

FIG. 2 is a block diagram showing a specific circuit configuration of the lens microcomputer 101 and the shake correction system 102 of the lens electric system 110.

Since the configuration is almost the same as the configuration of the block diagram in FIG. 7, a number obtained by adding 500 to the reference numeral in FIG. 7 is given, and the detailed description thereof is omitted. 7 is different from FIG. 7 in that the first determination / control unit 520 and the second determination / control unit 521 include the A / D converter 505 and the high-pass filter (H
PF) 510.

FIG. 3 is a flowchart showing a specific processing operation in the lens microcomputer 504 of FIG.

Here, the image blur correction operation is performed by an interrupt process generated at regular intervals. Then, control in a first direction, for example, a pitch direction (vertical direction), and control in a second direction, for example, a yaw direction (horizontal direction) are performed alternately. When an interrupt occurs, the lens microcomputer 504 starts the operation from step # 101 in the flowchart shown in FIG.

First, in step # 101, it is determined whether the current control direction is the pitch direction or the yaw direction. If it is in the pitch direction, proceed to step # 102,
A data address is set so that various flags, coefficients, calculation results, and the like can be read and written as pitch data, and the flow advances to step # 104. If it is in the yaw direction, step # 1
03, a data address is set so that various flags, coefficients, calculation results, and the like can be read and written as yaw data, and the flow proceeds to step # 104.

In step # 104, the output of the vibrating gyroscope 501, which is an angular velocity sensor, is A / D converted, and the result is stored in the RAM in a predefined AD_DATA. Then, in the next step # 105, it is determined whether or not an instruction to start image blur correction has been issued. This is, for example, an AND of the switch SWIS ON and the switch SW1 ON.
To start image blur correction. If an instruction to start image blur correction has been issued, the process proceeds to step # 106, and if not, the process proceeds to step # 118. Here, an instruction to start image blur correction has been issued, and the process proceeds to step # 106. At the same time, power is supplied to the vibration gyro 501, the amplifier 503, the D / A converter 507a, and the D / A converter 507b (not shown).

In step # 106, the offset compensation calculation end flag is determined. When the offset compensation calculation has been completed, the H level is set, and when the offset compensation calculation is not completed, the L level is set. If the flag is at L level, step # 1
In step 07, an offset compensation calculation is performed to keep the output of the vibration gyro 501 within the dynamic range (to avoid saturation) and to output the output to a predetermined target value. Detailed operation is
This will be described separately based on the flowchart of FIG. After this calculation, the process proceeds to step # 118.

If the flag is at the H level, the offset compensation calculation has been completed, and the process proceeds from step # 106 to step # 108 to determine the anti-shake operation start flag. When the start of the image stabilization operation is instructed, the H level is set, and when not, the L level is set. If the flag is at the L level, the process proceeds to step # 109, where the first determination and control unit 520 performs the first determination and control of the amplified output on the vibration gyro 1. Note that the anti-shake operation start flag referred to in step # 108 is determined during the control in step # 109. That is, an instruction to start an anti-shake operation is issued based on the first determination result. The reason for performing the first determination and the detailed operation will be separately described based on the flowchart of FIG. Thereafter, the process proceeds to step # 118.

When it is determined in step # 108 that the flag is at the H level, since the anti-vibration operation has started, the process proceeds to step # 110, where the operation status of the second determination after the start of the anti-vibration operation is reflected. The second determination end flag is determined. When the second determination is completed, the level is H level, and when the second determination is not completed, the level is L level. If the flag is at the L level, the process proceeds to step # 111. In order to further increase the accuracy of the determination, the second determination and control unit 521 performs the second determination and Perform control. The reason for performing the second determination and the detailed operation will be separately described based on the flowchart of FIG.

If the flag is at the H level in step # 110, the second determination has been completed, so the process immediately proceeds to step # 112, and a high-pass filter (HPF) operation is performed to cut off the DC component. Then, in the next step # 113, an integral operation for image stabilization control is performed, and the signal is converted into an image shake angular displacement signal (BURE_DATA). In the following step # 114, the output of the position sensor 510 for detecting the position of the correction lens is taken and A / D converted (after conversion = PSD_DATA).

In the next step # 115, a feedback operation {(BURE_DATA)-(PSD_DATA)} is performed. Then, in step # 116, a phase compensation calculation is performed to make a stable control system, and the next step # 11
7, the PWM converter 513 sends the coil driver 5
14 to perform PWM output. As a result, image stabilization control is performed, and image shake is corrected.

If the instruction to start image blur correction has not been issued in step # 105, the process proceeds to step # 118 as described above. Then, in step # 118, the high-pass filter (HPF) calculation, the initialization of the integration calculation, and the clearing of the timers 1 and 2 are performed. In this step, the image blur correction operation is not performed, and the correction lens is kept energized at a predetermined position.

By the above steps # 101 to # 118, image blur correction control is performed.

Next, the offset compensation calculation in step # 107 of FIG. 3 will be described with reference to the flowchart of FIG.

First, in step # 201, D / A
It is determined whether the setting for outputting the initial output from the conversion unit 507 has been made. This is for example the flag H
Alternatively, the determination is made at the L level. If the output has not been set and output, the process proceeds to step # 202. If the output has been set, the process immediately proceeds to step # 203.

In step # 202, an initial value is set in the D / A converter 507 so that the D / A converter 507 outputs an initial output. Here, as a method of setting the initial value, for example, the reference voltage value of the sensor is used as described above. Here, the setting is made so as to output about 1.35V. The reference voltage of the D / A value of the D / A conversion unit 507 is
Assuming that both the / A converters are, for example, 3.0 V, 8 bits = 25
Since it has a resolution of 6 LSB, 1.35 V = 115 LSB, and the value is set in the D / A converter 507a.
The / A converter 507b sets 0 LSB to output 0 level.

In the next step # 203, it is determined whether or not the signal A / value of the vibration gyro 1 is within the dynamic range. Here, the A / D converter 505
Assuming that the A / D reference voltage is 3.6 V, for example,
It is determined whether the D value is 3.5 V or more. If it is 3.5 V or more, the output is close to saturation or there is a high possibility that the output is saturated, so the process proceeds to step # 204.

In step # 204, since the A / D value does not fall within the dynamic range and is likely to be saturated on the H level side, the D / A value connected to the non-inverting input terminal of the operational amplifier 502 is high. The output of the conversion unit 507 is changed to control the output so that the A / D value does not saturate. It is preferable that the variable amount of the output after amplification is set to a change amount that does not exceed the reference voltage amount of the A / D by one control of the D / A converter. As described above, the A / D converter 50
Assuming that the A / D reference voltage of No. 5 is, for example, 3.6V,
A change of less than 3.6V is preferred. This is for the purpose of first outputting a saturated output to an arbitrary level that does not saturate, so that the number of voltage changes is as small as possible. Here, the amplification factor (R
(Determined by 3 / R1) is, for example, 64 times, and if the non-inverting input terminal of the operational amplifier 502 is changed by ΔVref, the amplified output (output before A / D conversion) becomes (amplification factor of the amplification unit 503 +1) × It changes by ΔVref = 65 × ΔVref. If the output change after amplification is, for example, 3.0 V, then ΔVref = 0.0462 V. Therefore, if the output of the D / A converter 507 is changed by “ΔVref = 0.0462V”, the output after amplification changes by 3.0V. D / A converter 5
07 D / A converters 507a and 507b are “8bit =
With a resolution of 256 LSB, 0.0462 V を 持 つ 4 LSB
Only change the setting value. Here, the D / A converter 507
Subtract “0.0462V4624LSB” from the current set value of a and set. On the other hand, the other D / A converter 507b does nothing and keeps it as it is. This reduces the amplified output by 3.0V. Thereafter, the offset compensation calculation is temporarily terminated.

When the process proceeds to step # 205, the A / D value
It is determined whether the voltage is 0.1 V or more. If it is 0.1 V or more, the output is not saturated and is within the dynamic range, so the flow proceeds to step # 207. On the other hand, if it is 0.1 V or less, there is a high possibility that it is saturated on the L level side, so the process proceeds to step # 206.

At step # 206, since the A / D value does not fall within the dynamic range and is likely to be saturated on the H level side, the D / D value connected to the non-inverting input terminal of the operational amplifier 502 is high. The output of the A converter 507 is changed to control the output so that the A / D value does not saturate. Here, only the D / A converter 507a sets the current set value to 0.04.
62V 加 算 Add and set only 4LSB. On the other hand, the other D / A converter 507b does nothing and keeps it as it is. As a result, the amplified output increases by 3.0V. Thereafter, the offset compensation calculation is temporarily terminated.

That is, step # 204 or # 20
6 is performed a plurality of times to avoid saturation of the amplified output (the output saturation avoidance control unit 60 performs the processing of steps # 204 and # 206). In this step, only the D / A converter 507a is changed, and the coarse adjustment is performed so that the amplified output falls within the dynamic range.

When the process proceeds to the next step # 207, the A / D value is not less than 0.1 V and less than 3.5 V, and at this time, the sensor amplified output is within the dynamic range where it is not saturated. And this output is the target value, for example, 1.8V ± 0.1
It is determined whether or not there is within V. Here the target value ±
Although it is set within 0.1 V, it may be limited to a narrower range. If within the above range, step # 211
Then, if it is near the target value, the offset compensation calculation of the sensor is completed. Therefore, the offset compensation calculation end flag is set to H. If it is out of the range, the process proceeds to step # 208.

In step # 208, the output is not saturated, but since the deviation from the target value is large, the output of the D / A converter 507 is controlled so as to output the target value. First, a deviation XX of a current A / D value from a target value, for example, 1.8 V, is calculated as follows: XX = (target value voltage−A / D value) = (1.8V−A / D value). Then, in the next step # 209,
A data table (control data storage unit 50) which previously stores output change amount data of D / A converters 507a and 507b for outputting to a target value corresponding to the value of X.
6b), the control data corresponding to the value of X (control data of the D / A converter 507a: ± αLSB, D
The control data of the / A converter 507b: ± βLSB) is read.

In the next step # 210, D / A is performed based on the two control data (± αLSB, ± βLSB).
Change the outputs of converters 507a and 507b. That is, in steps # 209 and # 210, the output value within the dynamic range is output to or near the target value (the data selection / control unit performs the processing in steps # 209 and # 210). 506c).

The control resolution can be summarized as follows.
The output resolution of the A / A converter alone is 8 bits and the reference voltage is
Since the voltage is 3.0 V, the voltage is 0.0117 V / LSB. However, by controlling each D / A converter independently, it is possible to control with higher resolution.

In the present embodiment, the amplification output resolution is {resistance R4 / (resistance R4 + resistance R5)} × 0.0117V / LS
B × (amplification rate of amplification section 503 + 1). For example, if "R4: R5 = 4.7: 510" and the amplification factor of the amplification section 503 = 64, the control minimum resolution of the amplification output is 0.00696 V, and the control can be performed with high accuracy. Further, when it is desired to control with a finer resolution, the resistance ratio between the resistors R4 and R5 may be set higher.

By the above steps # 201 to # 211, the sensor offset component is compensated and the output is output near the target value.

Next, the first determination and control in step # 109 of FIG. 3 will be described.

In this first determination, it is determined how the amplified output of the vibrating gyroscope 1 after the offset compensation calculation is in a predetermined time. If the output fluctuation during the predetermined time exceeds the predetermined range, it is highly likely that the offset compensation calculation was performed while the device was largely shaken, and that accurate offset compensation may not be performed. In such a case, the output of the vibration shiro 1 may be saturated after the device is stabilized, and vibration detection may not be possible.
If the output fluctuation falls within a predetermined range within a predetermined time, it is determined that the operation is in a relatively stable state and an almost accurate offset compensation calculation has been performed, and the anti-shake operation can be started.

In the setting of the judgment time, the longer the judgment time, the higher the accuracy of the judgment, but the longer the start-up time of the anti-vibration operation. Therefore, in this case, the emphasis is placed on the vibration-isolation operation start-up time during normal hand-held support, and the time is not set so long. Hereinafter, description will be made based on the flowchart of FIG.

In step # 301, it is determined whether or not the A / D value is output within, for example, 1.8 ± 0.3V. The determination range here is preferably set to a value slightly larger than the normal camera shake amount. If it is not within the predetermined range, it is determined that the apparatus is being swung, and step # 30
Proceed to 2. If within the predetermined range, the process proceeds to step # 303.

In step # 302, since the output is not within the predetermined range, the timer 1 is cleared, and the offset compensation calculation end flag is set to the L level so that the offset compensation calculation is performed again. Thereafter, the process proceeds to step # 107 in FIG. 3, and the offset compensation calculation is performed.

On the other hand, when the process proceeds to step # 303, the output is within the predetermined range, so that the timer 1 which is the first timer for measuring the determination time is counted up. Then, in the next step # 304, it is determined whether or not the timer 1 has passed, for example, 200 msec. If the predetermined time has elapsed, the process proceeds to step # 305. If the predetermined time has not elapsed, the first determination and control are terminated, and the process proceeds to step # 305 in FIG.
Go to 118.

In step # 305, since the output is within the predetermined judgment range within the predetermined judgment time, the anti-shake operation flag for instructing the start of the anti-shake operation is set to H level.

By the above steps # 301 to # 305, the first judgment and control are performed (the above-mentioned step # 3).
01, # 303, and # 304 correspond to the first determination process, and steps # 302 and # 305 correspond to the first control, respectively).

Next, the second determination and control in step # 111 of FIG. 3 will be described.

Here, the reason why the second determination is made following the first determination is that the first determination is set to a relatively short determination time with emphasis on the start-up time of the anti-vibration operation. This is because the accuracy of the first determination is slightly reduced. Although the first determination determines that the device is being shaken,
In some cases, the determination condition is satisfied despite the swinging state (step # 301 → # in FIG. 5).
303). Therefore, the second determination is also performed as a countermeasure in that case. The determination time setting here is set slightly longer than the determination time of the first determination.

Hereinafter, description will be made based on the flowchart of FIG.

In step # 401, it is determined whether or not the A / D value is output within, for example, 1.8 ± 1.0V. The setting of the determination range is determined in consideration of a detection range in which vibration can be detected during normal hand holding, and in consideration of a maximum allowable deviation amount from an output target value. If it is not within the predetermined range, it is determined that the apparatus is still unstable while being largely shaken, and the process proceeds to step # 402. If within the predetermined range, the process proceeds to step # 403.

In step # 402, since the output is not within the predetermined range, the timers 1 and 2 are cleared, and the offset compensation calculation end flag is set to the L level so that the offset compensation calculation is performed again. Further, the image stabilization operation start flag is also set to the L level to temporarily suspend the image stabilization operation. For example, the correction lens is set to a power-on state. After this, step # in FIG.
Proceeding to 107, an offset compensation operation is performed.

When the process proceeds to step # 403, the output is within the predetermined range, so that the timer 2 as the second timer for counting the determination time is counted up. Then, in the next step # 404, it is determined whether or not the timer 2 has passed, for example, 1.0 second. If the predetermined time has elapsed, the process proceeds to step # 405. If the predetermined time has not elapsed, the second determination and control are terminated, and the process proceeds to step # 1 in FIG.
Proceed to 12.

In step # 405, since the output is within the predetermined judgment range within the predetermined judgment time, the second judgment end flag is set to H level.

By the above steps # 401 to # 405, the second judgment and control are performed (step # 4).
01, # 403, and # 404 correspond to the second determination processing, and steps # 402 and # 405 correspond to control based on the second determination result, respectively).

If the predetermined judgment time and the predetermined judgment range in the first judgment and the predetermined judgment time and the predetermined judgment range in the second judgment are stored in the rewritable storage means, various kinds of data can be stored. Optimal judgment time and judgment range can be set for the type of device, for example,
Settings can be easily made from the outside, such as a setting that places importance on the rise time of the image stabilization operation or a setting that increases the accuracy of the determination. In addition, the second determination time is longer than the first determination time, the second determination range is an example is set wider than the first determination range, but is not limited thereto, The second determination time may be equal to or longer than the first determination time, and the second determination range may be set to be wider or equal to the first determination range.

According to the above embodiment, the sensor output after the offset compensation calculation is set to a predetermined judgment condition (specifically, the A / D value is set to a value slightly larger than the normal camera shake by 2).
After the determination is made within 00 msec, the image stabilization is started after the start of the image stabilization. Also, after the image stabilization is started, the sensor output is kept under a predetermined judgment condition (specifically, near the maximum value that can be detected during a normal camera shake). Is determined if the A / D value is within 1.0 msec), and it is determined whether an accurate offset compensation operation has been performed. In some cases, the offset compensation operation and the first determination are performed again. The second judgment is performed. Therefore, even if the apparatus performs the compensation calculation of the offset component in a panning state or a large shake state, it is possible to prevent the detection of the vibration from being impossible thereafter, and to prevent the image shake correction operation from being adversely affected. it can.

(Modification) In the above embodiment,
Although an example in which an angular velocity sensor is used as the vibration detection means is shown, any type of means capable of detecting shake, such as an angular acceleration sensor, an acceleration sensor, a speed sensor, an angular displacement sensor, and a displacement sensor, may be used. Is also good.

The image blur correcting means includes a shift optical system for moving an optical member in a plane perpendicular to the optical axis, a light flux changing means such as a variable apex angle, and a moving image plane in a plane perpendicular to the optical axis. Any device can be used as long as the image blur can be corrected.

Further, the configuration of the invention or embodiment described in each claim may be such as to form one device as a whole, or to be separated or combined with another device. Alternatively, it may be such as an element constituting a device.

[0071]

As described above, according to the first aspect of the present invention, it is possible to provide a vibration detecting device capable of accurately detecting vibration without saturating the output of the vibration detecting means. is there.

Further, according to the second aspect of the present invention, even if the apparatus performs an operation of removing an offset component superimposed on a shake signal in a panning state or a large shake state, adverse effects will be exerted on a subsequent image shake correction operation. It is possible to provide an image blur correction device that does not exert any influence.

[Brief description of the drawings]

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

FIG. 2 is a block diagram illustrating a specific circuit configuration of a main part according to one embodiment of the present invention.

FIG. 3 is a flowchart illustrating an image blur correction interrupt control operation according to the embodiment of the present invention.

FIG. 4 is a flowchart illustrating details of an offset compensation operation according to the embodiment of the present invention.

FIG. 5 is a flowchart illustrating details of first determination and control according to the embodiment of the present invention.

FIG. 6 is a flowchart illustrating details of a second determination and control according to the embodiment of the present invention.

FIG. 7 is a block diagram illustrating a specific circuit configuration of a main part of a part related to a conventional image blur correction.

FIG. 8 is a diagram showing an example of a sensor output at the time of rest and at the time of a panning operation.

[Explanation of symbols]

 Reference Signs List 101 lens microcomputer 102 shake correction system 106 shake sensor 108 shake correction drive system 117 camera microcomputer 501 vibration gyro 503 amplifying unit 504 lens microcomputer 506 offset removing means 507 D / A conversion unit 520 first determination / control unit 521 second determination・ Control unit

Claims (6)

[Claims] 1. A vibration detection means for detecting vibration, a correction voltage output means for outputting a correction voltage, a comparison means for outputting a difference between an output of the vibration detection means and the correction voltage output,
A vibration detection device having an offset removal unit that removes an offset component of the output of the vibration detection unit by controlling the output of the correction voltage based on the output of the comparison unit. If the output of the comparison means after the detection does not fall within a predetermined determination range within a predetermined determination time, a control means for operating the offset removing means again is provided. 2. A vibration detection means for detecting vibration, a correction voltage output means for outputting a correction voltage, a comparison means for outputting a difference between an output of the vibration detection means and the correction voltage output,
An image blur correction device comprising: an offset removal unit that removes an offset component of an output of the vibration detection unit by controlling the correction voltage output based on an output of the comparison unit. After that, it is determined whether or not the output of the comparing means is within a first determination range within a first determination time. If the output is within the determination condition, an instruction to start an anti-shake operation is issued. If not, a first determination and control means for operating the offset removing means again and again determining whether or not it is within the first determination range within the first determination time, and Operate after the instruction, determine whether the output of the comparing means is within the second determination range within the second determination time, and if the output is within the determination condition, permit the anti-shake operation; Within If not, an image blur correction device is provided, which includes a second determination and control unit that prohibits the start of the image stabilization operation and operates the first determination and control unit again. 3. The image blur correction apparatus according to claim 2, wherein the image stabilization operation is to drive an image blur correction unit. 4. The image blur according to claim 2, wherein the image stabilizing operation is to drive an image blur corrector based on an output of the vibration detector to perform image blur correction. Correction device. 5. The method according to claim 5, wherein the second determination time is equal to or longer than the first determination time, and the second determination range is set to be wider or equal to the first determination range. The image blur correction device according to claim 2, wherein: 6. The method according to claim 1, wherein the second determination time is longer than the first determination time, and the second determination range is set wider than the first determination range. Item 3. An image blur correction device according to Item 2.