JPH07230107A - Shake correction device - Google Patents

Abstract

PURPOSE:To always optimally perform shake correction by performing correction to the main component of shake even when various amplitude and the deflection of frequency coexist. CONSTITUTION:This device is provided with a frequency detecting means 13 having plural different detection levels for output signal from a vibration detecting means 1 and detecting the frequency at respective detection levels; and an operation state deciding means 12 deciding the operation state of an equipment mounted on a device based on output from the detecting means 13 and the output from the detecting means 1, and controlling the shake correction characteristic by a correcting means 9 and driving means 8 and 11. Based on the plural frequencies obtained by the output signal from the detecting means 1 according to plural detection levels and the output from the means 1, the operation state of the equipment mounted on the device is decided and the shake correction is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a shake correction device incorporated in equipment such as a photographing device.

[0002]

2. Description of the Related Art In a conventional photographing device, exposure setting,
It is automated and multifunctional in all respects such as focus adjustment, so that good shooting can be done easily.

However, it is often the camera shake that actually deteriorates the quality of a photographed image.
In recent years, various shake correction devices for correcting this camera shake have been proposed and are attracting attention.

FIG. 14 shows an example of the configuration of a conventional shake correction apparatus.

In FIG. 14, reference numeral 1 denotes an angular velocity detector composed of an angular velocity sensor such as a vibration gyro, which is attached to the shake correction device. Reference numeral 2 denotes a DC cut filter that cuts off the DC component of the angular velocity signal output from the angular velocity detector 1 and passes only the AC component, that is, the vibration component. As the DC cut filter 2, a high-pass that cuts off the signal in an arbitrary band is used. Filter (hereinafter referred to as HPF)
May be used. An amplifier 3 amplifies the angular velocity signal output from the DC cut filter 2 to an appropriate sensitivity.

Reference numeral 4 is an A / D converter for converting the angular velocity signal output from the amplifier 3 into a digital signal, and 5 is an integrating circuit for integrating the output from the A / D converter 4 and outputting an angular displacement signal, 6 Is a pan / tilt determination circuit that determines the panning / tilting of the image capturing apparatus from the integrated signal of the angular velocity signal output from the integration circuit 5, that is, the angular displacement signal, and 7 is the output from the pan / tilt determination circuit 6 as an analog signal or It is a D / A converter that converts and outputs a pulse output such as PWM.

The A / D converter 4, the integrating circuit 5, the pan / tilt judging circuit 6, and the D / A converter 7 are, for example, a microcomputer (hereinafter referred to as a microcomputer) COM.
It is composed of 1.

Reference numeral 8 is a drive circuit for driving so as to suppress an image correction means, which will be described later, based on the displacement signal output from the microcomputer COM1. Reference numeral 9 denotes an image correcting means, for example, an optical correcting means for displacing the optical optical axis to cancel the shake, or an electronic correcting means for electronically shifting the read position of the image from the memory storing the image to cancel the shake. Correction means are used.

[0009]

However, the above-mentioned device has the following problems.

Usually, when carrying out handheld photography, there are various methods such as following a moving subject and taking a picture of a still object.

In this case, when correcting a shake occurring in a device such as a photographing device, the anti-vibration effect is often not appropriate.

[0012] For example, even if small shakes can be corrected, loose shakes cannot be corrected and appear on the screen, and the image stabilization effect cannot be felt, or a moving subject while shooting can be used. There were problems such as being unable to chase.

(Object of the Invention) A first object of the present invention is to provide a method in which fluctuations of various amplitudes and frequencies are mixed.
It is an object of the present invention to provide a shake correction apparatus capable of correcting the main component of shake and always performing optimum shake correction.

A second object of the present invention is to provide a shake correction apparatus capable of performing more optimum shake correction.

[0015]

According to the present invention, there are provided a plurality of different detection levels for the output signal of the vibration detection means and a frequency detection means for detecting a frequency at each detection level, and an output of the frequency detection means. The operation state determination unit that determines the operation state of the device mounted on the apparatus from the output of the vibration detection unit and controls the correction characteristic of the shake by the drive unit is provided, and the vibration is detected by a plurality of detection levels. From the plurality of frequencies obtained by the output signal of the detection means and the output of the vibration detection means, the operating state of the equipment mounted on the apparatus is determined and the shake correction is controlled.

Further, the present invention has a plurality of different detection levels for the angular velocity signal and the angular displacement signal which are the outputs of the vibration detection means, and outputs the detection frequency obtained at each detection level to the operating state determination means. Detecting means and operation state determining means for controlling the correction characteristic of the shake by the driving means based on the output of the vibration detecting means and the output of the frequency detecting means are provided to correspond to the angular velocity signal and the angular displacement signal, respectively. Based on the plurality of frequencies obtained by the plurality of detection levels provided and the output of the vibration detecting means, the operating state of the equipment mounted on the apparatus is determined and the shake correction is controlled.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a block diagram showing the schematic arrangement of a shake correction apparatus according to the first embodiment of the present invention, and shows an example incorporated in a photographing apparatus. The parts having the same functions as those in FIG. 14 are designated by the same reference numerals.

In FIG. 1, an angular velocity detector 1 including an angular velocity sensor such as a vibration gyro attached to the apparatus, and a DC cut filter (or HPF) for cutting off a DC component of an angular velocity signal output from the angular velocity detector 1. 2. With respect to the amplifier 3 for amplifying the angular velocity signal to a predetermined sensitivity, the drive circuit 8, and the image correction means 9, the same configuration as the conventional one shown in FIG. 14 can be used, and in the present embodiment. The difference is the internal configuration of the microcomputer COM2 that controls the entire apparatus. In this embodiment, as the image correcting means 9, for example, a variable apex angle prism described later or a memory control method is used.

The structure of the microcomputer COM2 will be described below.

Reference numeral 4 is an A / D converter for converting the angular velocity signal output from the amplifier 3 into a digital signal, 10 is an HPF having a function capable of varying in an arbitrary band, and 5 is an HPF 10
An integrating circuit 11 which integrates the signal of the predetermined frequency component extracted by to calculate the angular displacement signal in the frequency component, 11 corrects the integrated signal output output from the integrating circuit 5, that is, the phase and gain of the angular displacement signal. This is a phase / gain correction circuit.

Numeral 12 is a panning / angulation signal based on an angular velocity signal, an angular displacement signal and an output from a frequency detecting means 13 which will be described later.
Determine the operating status such as the tilting judgment, and check the HPF.
An operating state determining means for controlling the characteristics of 10 and the phase / gain correction circuit 11 according to the operating state, 13 detects the vibration applied to the device from the angular velocity signal output from the A / D converter 4. The frequency detection means detects the frequency of the vibration and outputs the frequency to the operation state determination means 12. Reference numeral 7 denotes a D / A converter that converts the output signal of the phase / gain correction circuit 11 into an analog signal or a pulse signal such as PWM and outputs the converted signal.

The specific operation of the panning / tilting judgment in the above-mentioned operation state judging means 12 is the presence / absence of vibration of the angular velocity signal output from the A / D converter 4 and the angular displacement signal output from the integrating circuit 5. When the angular velocity is constant and the angular displacement signal obtained by integrating the angular velocity signal shows a monotonic increase, it is determined to be panning or tilting. In such a case, the low cutoff frequency of the HPF 10 is set. The characteristics are changed so that the shake correction system does not respond to low-frequency frequencies by shifting to higher frequencies.

When panning / tilting is detected, for example, the variable apex angle prism is gradually centered to the center of the moving range. During this period, the angular velocity signal and the angular displacement signal are detected, and when the panning / tilting is completed, the cutoff frequency in the low frequency range is lowered again to expand the shake correction range.

Here, the drive circuit 8 and the image correction means 9 for actually correcting the shake of the image in accordance with the control signal output from the microcomputer COM2 will be explained with examples.
For example, the ones shown in FIGS.

FIG. 2 shows a variable apex angle prism (hereinafter referred to as VA).
P: Variable angle prisum) 306 is used,
A voice coil type actuator is used for the drive system,
The control system constitutes a closed loop in which the angular displacement is detected by an encoder and is fed back to the drive system to control the drive amount.

First, the VAP 306 will be described in detail.

As shown in FIG. 3, the VAP 306 includes a transparent elastic body having a high refractive index (refractive index n) or an inert liquid 342 between two transparent parallel plates 340 a and 340 b facing each other.
Are sandwiched between the transparent parallel plate 3 and the outer periphery of the transparent parallel plate 3 which is elastically sealed with a sealing material 341 such as a resin film.
40a, 340b has a structure in which it can swing,
By swinging the transparent parallel plates 340a and 340b,
The optical axis is displaced to correct shake.

FIG. 2 is a diagram showing a passing state of the incident light beam 344 when one transparent parallel plate 340a of the VAP 306 of FIG. 8 is rotated about the axis 301 (311) by an angle σ. As shown in the figure, the light beam 344 incident along the optical axis 343 has the same principle as that of the wedge prism.
It is deflected by an angle φ = (n−1) σ and emitted. That is,
The optical axis 343 is decentered (deflected) by an angle φ.

Returning to the explanation of FIG. 4, the VAP3 explained above is explained.
06 is fixed to the lens barrel 302 so as to be rotatable about the shafts 301 and 311 via the holding frame 307.

313 is a yoke, 315 is a magnet, 3
Reference numeral 12 denotes a coil, which constitutes a voice coil type actuator capable of varying the apex angle of the VAP 306 about the shaft 311 by passing a current through the coil 312. Reference numeral 310 is a slit for detecting the displacement of the VAP 306, which is coaxial with the shaft 311 and holds the holding frame 307, that is, the VAP.
It rotates together with 306 to displace its position. 308 is a light emitting diode for detecting the position of the slit 310, 309
Is a PSD (Position Sensing Detector) and constitutes an encoder for detecting the angular displacement of the VAP apex angle by detecting the displacement of the slit 310 together with the light emitting diode 308.

Then, the light flux whose incident angle is changed by the VAP 306 is imaged on the image pickup surface of the image pickup device 304 such as CCD by the taking lens unit 303.

Reference numeral 305 indicates the center of the other rotation axis orthogonal to the rotation axis composed of the axes 301 and 311 of the holding frame 307.

Next, the basic structure of the control circuit for driving and controlling the VAP 306 and its operation will be described with reference to the block diagram of FIG.

In FIG. 5, 306 is a VAP, 322 is an amplifier, 323 is a driver for driving an actuator,
Reference numeral 324 is a voice coil type actuator for driving the VAP 306 described above, and 326 is an encoder for detecting the vertical angle displacement of the VAP 306. 325 is a microcomputer COM
2 is an adder that adds the shake correction control signal 320 and the output signal of the angular displacement encoder 326 with opposite polarities, and the shake correction control signal 320 and the angular displacement encoder 326 output from the microcomputer COM2. Since the control system operates so as to be equal to the output signal of the VAP306, the VAP306 is driven so that the control signal 320 coincides with the output of the encoder 326, so that the VAP306 is moved to the position instructed by the microcomputer COM2. Controlled.

FIG. 6 shows a second example of the image correction means 9, which is constructed such that the VAP 306 described above is driven by using a stepping motor instead of a voice coil type actuator.

This is because the stepping motor 401 rotates the shaft 301 as the center of rotation and the V
It is configured to drive the AP 306.

That is, a stepping motor 401 having a lead screw 401a on its rotation axis is attached to a support frame 403 attached to a lens barrel 302, and a guide shaft 405 of the support frame 403 allows the stepping motor 401 to move in the optical axis direction. The guided carrier 404 is always meshed with the lead screw 401a, and the carrier 404 is fixed to the support frame 307.
By rotatably connecting the holding frame, the stepping motor 401 is rotated to move the carrier 404 in the optical axis direction, and the holding frame is connected to the shafts 301 and 311 via the connecting rod 407.
The VAP 306 is driven by rotating it around.

Reference numeral 402 is a reset sensor for detecting the reference position of the VAP 306. In addition, V similar to this
An AP drive mechanism is also provided for the shaft 311, but a description thereof will be omitted.

The circuit configuration for driving and controlling the system of FIG. 6 is as shown in the block diagram of FIG.

In FIG. 7, the control signal 320 output from the microcomputer COM2 is drive-calculated in the drive arithmetic circuit 410 to be converted into a drive signal for the VAP 306 and output to the driver IC 411. And the driver IC4
11 drives the stepping motor 401,
The apex angle of 306 is changed.

FIG. 8 shows a third example of the image correction means 9.

This is to store the image information in the memory, set the cut-out range of the image from the memory smaller than the stored image, and shift the cut-out position of the image from the memory in the direction to cancel the movement of the image. Thus, the image correction means of the memory control system is configured to correct the shake, and further expand the cut-out image signal to correct the screen size and then output the image signal.

This system is characterized in that shake correction can be performed electronically without using an optical correction mechanism such as VAP.

In FIG. 8, reference numeral 100 denotes a zoom lens, 1
Reference numeral 01 is an image pickup device (CCD image sensor or the like) for converting an optical image into an electric signal, and 102 is an A / D converter. 10
An image processing circuit 3 is provided in the field memory 106 so as to reduce a shake component in the image pickup signal based on a control signal (shake signal) 108 input from the microcomputer COM2.
An angle of view for performing a so-called electronic zoom by performing a shake correction process of correcting a shake of an image by shifting a cutout position of more predetermined image information and an enlargement process of an image read from the feed memory 106, and converting to a normal screen size. It constitutes a correction processing unit and is realized by a microcomputer.

Reference numeral 104 interpolates one pixel signal from image information of two or more adjacent pixels by zoom information when performing electronic zoom for correcting an image read from the field memory 106 to a normal angle of view. It is an interpolation processing means. As this interpolation method, well-known means may be used, for example, interpolation between pixels may be performed with an average value between adjacent pixels. Further, 105 is a D / A converter, 107
Is an encoder for detecting the zoom magnification ratio of the zoom lens 100.

Next, the operation of the above configuration will be described.

The optical image that has passed through the zoom lens 100 is
It is converted into an electric signal by the image sensor 101 and output as an image signal. The image pickup signal is converted into a digital signal by the A / D converter 102, and the image information for one field is stored in the memory 106 via the memory control unit of the image processing circuit 103.
Write to. Here, the control signal (shake signal) 108 input from the microcomputer COM2 and the zoom information from the encoder 107 determine the cut-out position of the image signal from the field memory 106, that is, the read range and its read position.

Next, the signal read from the field memory 106 is supplied to the scanning width of the output image according to the cutout size,
That is, in order to convert the angle of view to the original size, the number of pixels to be output in a normal one pixel output period is obtained, and the interpolation processing circuit 104 performs interpolation processing for pixels without pixel information. Then, this signal is converted into an analog signal by the D / A converter 105 and output.

The specific example of the image correction means 9 for correcting the shake has been described above.

Next, the processing operation of the microcomputer COM2 in this embodiment shown in FIG. 1 will be described with reference to the flowchart of FIG.

First, in step S201, the DC component is removed through the DC cut filter 2 and the amplifier 3, and the angular velocity signal from the angular velocity detector 1 amplified to a predetermined level is converted into an A / D converter 4 by the A / D converter 4. It is converted into a digital signal by and is taken in by the microcomputer COM2.

Subsequently, in step S202, the angular velocity signal and the predetermined high frequency component extracted from the angular velocity signal by the HPF 10 are integrated by the integrator circuit 5 to obtain the angular displacement signal.
Make a decision.

In step S203, the coefficient for setting the characteristics of the HPF 10 is read from a table (not shown) prepared in advance in the microcomputer COM2 according to the result of the determination. That is, if the HPF 10 is configured by a digital filter, the characteristics of the HPF 10 can be freely changed by reading and setting a predetermined coefficient from a table storing the coefficient.
These panning / tilting coefficients are empirically determined.

In the next step S204, the HPF 10 is calculated using the characteristic setting coefficient to set the characteristic, and in the subsequent step S205, the HPF 10 is calculated.
The signal output by 10 is integrated by the integrating circuit 5,
It is converted into an angular displacement signal (shake signal).

Next, in step S206, the angular velocity signal output from the A / D converter 4 is calculated by the frequency detecting means 13 to detect the center frequency of the shake, and in the next step S207, it is obtained in step S206. The correction coefficient of the phase / gain correction circuit 11 corresponding to the center frequency of the shake is read in advance from a table (not shown) prepared in the microcomputer COM2.

The phase / gain correction circuit 11 is for compensating the deterioration of the shake correction characteristic due to the phase delay of the shake correction system, has a phase lead element, and is composed of, for example, a digital filter as described later, The correction coefficient of this digital filter is read and the phase and gain correction characteristics corresponding to the shake frequency are set.

In step S208, correction calculation is performed using the coefficient obtained in step S207, and the calculation result obtained in the next step S209, that is, the corrected angular displacement signal, is sent to the D / A converter 7. Is converted into an analog signal or is output from the microcomputer COM2 as a pulse output such as PWM.

Since the HPF 10, the integrator circuit 5, and the phase / gain correction circuit 11 use digital filters and the like, the sampling time must be relatively high (for example, about 1 kHz), but the panning / tilting The operation state determination unit 12 and the frequency detection unit 13 that perform the determination may perform a process with a relatively slow cycle (for example, 100 Hz). In other words, it can be changed according to the situation.

As the frequency detecting means 13 using the angular velocity signal shown in FIG. 1, for example, a threshold value is provided near the center of the signal, and detection can be carried out by the time when the center is crossed or the number of times when it crosses in a fixed time. However, this method depends on the stability of the DC signal. That is, when shooting with a handheld device, low frequency components are considerably included, which makes it difficult to accurately detect the shake frequency.

Therefore, the frequency is detected by paying attention to the increase and decrease of the signal for each sampling. That is, increase in signal
One set of decrease is set as one shake, and the frequency is indexed according to how many sets are detected within a predetermined time. With this method, it is possible to detect every 1 Hz for 1 second and every 0.5 Hz for 2 seconds.

Here, an example of the method and operation of the frequency detecting means 13 in this embodiment will be described with reference to the flow chart shown in FIG. It should be noted that this process is repeatedly performed once every fixed time.

In step S301, reading (loading) of the frequency detection time T is performed in the next step S302.
In step S3, the counter t for the clock function is read out, that is, the counting operation of the counter is started, and the subsequent step S3
In 03, the frequency detection time T is compared with the clock counter t, and the count value t of the clock counter is equal to the predetermined time T.
If the time counter t has reached, the process proceeds to step S319, and if not, the process proceeds to step S304.

In step S304, "1" is added to the clock counter. Therefore, this "1" count-up coincides with the processing time when the processing shown in the flowchart of FIG. 10 is executed once.

In step S305, the increase flag 1 for confirming whether the increase of the angular velocity signal has occurred by the previous time is loaded. This increase flag is set to "H" when the increase has occurred up to the previous time, and is set to "L" when the increase has not occurred in the past.

In the next step S306, it is judged by the flag 1 whether or not the increase in the angular velocity signal has occurred up to the previous time, and if the flag 1 = "H", it is judged that the increase has occurred in the past. Then, the process proceeds to step S307, and if flag 1 = "L", it is determined that the increase has not occurred in the past, and the process proceeds to step S312.

In step S306, if the increase of the angular velocity signal has occurred by the previous time, step S306
At 307, decrease flag 2 is loaded to see if the decrease has occurred by the previous time. Decrease flag 2
Is set to "H" when the decrease has occurred until the last time, and is set to "L" when the decrease has not occurred in the past. In the next step S308, it is determined by the flag 2 whether or not the decrease has occurred up to the previous time. If the flag 2 = "H", that is, if the decrease has occurred in the past, the process proceeds to step S309, and the flag 2 =
If “L”, that is, the decrease has not occurred in the past, the process proceeds to step S312.

In step S309, a shake number counter N1 for counting the number of shakes (vibrations) is loaded, and in the next step S310, "1" is added to the shake number counter N1, and then the process proceeds to step S311. Then, the increase flag 1 and the decrease flag 2 are reset, and the process ends.

On the other hand, in the above step S306,
If it is determined that the increase flab 1 is not “H”, and
If it is determined in step S308 that the decrease flag 1 is not "H", that is, if neither increase nor decrease has occurred in the past, the process proceeds to step S312, where one sampling is performed (previous process). Of angular velocity data (ω-1) is loaded, and then the process proceeds to step S313 to load the angular velocity data ω of this time detected by the angular velocity detecting means 1. Then, in the next step S314, the threshold level a for a change that determines that the angular velocity data has increased or decreased within one sampling period is loaded. With the threshold level a and the sampling time, it is possible to set the value according to the frequency and the amplitude.

In the next step S315, the absolute value of the amount of change in the angular velocity data within one sampling period is compared with the threshold level a, and if not reached, the process ends. If it has reached (if the absolute value of the amount of change is equal to or greater than the threshold level a), the process proceeds to step S316, and the amount of change in angular velocity in one sampling period is positive (increase) or negative (decrease). ), And if positive, the process proceeds to step S317, the increase flag 1 is set to “H”, and the process ends. If it is not positive (if it is decreased), the process proceeds to step S318, the decrease flag 2 is set to "H", and the process ends.

By the way, when the count value of the clock counter t has reached the frequency detection time T in the above step S303, the process proceeds to step S319, the shake number counter N1 is loaded, and the next step S320.
In, the shake count N1 is divided by the detection time T to obtain the shake count (runout frequency F) per unit time (1 second). Then, in the next step S321, the shake counter N1 is cleared, and in the following step S322, the clock counter t is cleared. In the next step S323, the shake frequency F is stored in a predetermined storage area, and then the process proceeds to step S304 described above. The subsequent operation is as described above.

In this way, by considering the set of increase / decrease of the angular velocity signal as one vibration, it is easy to detect the shake in the low frequency range (for example, 1 Hz or less), and the threshold value is set. The influence of noise components can be removed by setting the level a. Further, there is an advantage that it can be easily realized by performing processing using a microcomputer.

In this embodiment, in the frequency detection from the angular velocity signal, a plurality of detection threshold levels are provided, and the frequency under each condition is determined by selecting or calculating the frequency to be corrected based on the determination of the operating state, It has a function of improving the control characteristic of shake correction.

Next, this operation will be described with reference to the flowchart of FIG.

In step S501, the angular velocity signal is read, in the next step S502, the frequency detection threshold level is set to a relatively small value, and in step S503, the detected small amplitude frequency (A
Hz). After reading the angular velocity signal in step S501, the process proceeds to step S504, in which the frequency detection threshold level is set to a relatively large value, and in the next step S505, the detected large amplitude frequency (B Hz) is set. Read.

After the operations of the above steps S503 and S505, the process proceeds to step S506 and the above step S50.
4 and S505, the operating state is determined from the frequency and the angular velocity signal / angular displacement signal, and in the next step S507, the correction characteristic is output to the phase / gain correction circuit 11 according to the determination in step 506, and the shake correction is performed. I do.

In the determination, for example, when a small-amplitude frequency and a large-amplitude frequency are detected by the plurality of frequency determination levels, the average of the respective frequencies is set as the correction target frequency, or the large-amplitude frequency is determined. If the frequency is higher than the small amplitude frequency, the large amplitude frequency is set as the correction target frequency.

(Second Embodiment) FIG. 12 is a block diagram showing the schematic arrangement of a shake correcting apparatus according to the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals.

The frequency detecting means 14 in the second embodiment detects the frequency from the angular velocity signal from the A / D converter 4 and the angular displacement signal from the integrating circuit 5. At that time, the plurality of frequency detection threshold levels are provided. Then, the operating state determination means 12 determines the frequency under each condition by selecting or calculating the frequency to be corrected based on the determination of the operating state.

Next, this operation will be described with reference to the flowchart of FIG.

In step S601, the angular velocity signal is read, in the next step S602, the frequency detection threshold level is set to a relatively small value, and then in step S603, the detected small amplitude frequency (A
Hz). After reading the angular velocity signal in step S601, the process proceeds to step S604, where the frequency detection threshold level is set to a relatively large value, and in step S605, the detected large-amplitude frequency (B Hz) is detected. ) Is read.

On the other hand, in step S606, the angular displacement signal is read, and in the next step S607, the frequency detection threshold level is set to a relatively small value,
Next, in step S608, the detected small amplitude frequency (C Hz) is read. Also, step S606
In step S609, the frequency detection threshold level is set to a relatively large value, and in step S610, the detected large amplitude frequency (D Hz) is read.

Steps S603, 605, 60 described above
After Steps 8 and 610, the process proceeds to Step S611, where the above Steps S603, S605, S608, and S61.
The operating state is determined from the frequency, the angular velocity signal, and the angular displacement signal obtained at 0, and in the next step S612, the correction characteristic is output to the phase / gain correction circuit 11 according to the determination in the above step S611 to perform the shake correction control. .

In the judgment, for example, during normal photographing, when a small amplitude frequency and a large amplitude frequency are detected by the plurality of frequency judgment levels, the large amplitude frequency is smaller. If it is higher than the frequency, the frequency with a large amplitude is set as the frequency to be corrected, and if a certain special shooting state or shooting mode is set, the correction state frequency calculation method preset by the shooting state determination means. The frequency calculated by the above is set as the correction target frequency.

As a method of determining the shooting state in step S611, the shooting state in the shake correction shooting apparatus such as the focal length, the subject distance, the aperture value, the brightness, the degree of focus blur, the zoom drive state, and the shutter speed is determined. However, the signals are not limited to these.

With the above configuration, the control characteristic for shake correction can be further improved as compared with the first embodiment.

[0087]

As described above, according to the present invention,
Frequency detecting means having a plurality of different detection levels with respect to the output signal of the vibration detecting means, and detecting the frequency at each of the detection levels, and mounted on the device from the output of the frequency detecting means and the output of the vibration detecting means. A plurality of frequencies and vibrations obtained by the output signal of the vibration detection means by a plurality of detection levels are provided, which are provided with the correction means and the operation state judgment means for controlling the shake correction characteristic by the driving means. From the output of the detection means, the operating state of the equipment mounted on the device is determined, and the shake correction is controlled.

Therefore, even when shakes of various amplitudes and frequencies are mixed, it is possible to correct the main component of shake, and it is possible to always perform optimum shake correction.

Further, according to the present invention, the angular velocity signal and the angular displacement signal output from the vibration detecting means have a plurality of different detection levels, and the detection frequency obtained at each detection level is output to the operating state determining means. Frequency detecting means, and an operating state determining means for controlling the correction characteristic of the shake by the driving means based on the output of the vibration detecting means and the output of the frequency detecting means, and the angular velocity signal and the angular displacement signal, respectively. The plurality of frequencies obtained by the plurality of detection levels provided corresponding to the above and the output of the vibration detecting means determine the operating state of the equipment mounted in the apparatus and control the shake correction.

Therefore, even when shakes of various amplitudes and frequencies are mixed, it is possible to correct the main component of shake, and more optimum shake correction can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a shake correction apparatus according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing an example in which a VAP is used as the image correction means in FIG. 1 and a voice coil actuator is used in a drive system.

3 is a diagram for explaining the configuration and operation of the VAP of FIG.

FIG. 4 is a diagram for explaining the configuration and operation of VAP in the same manner.

5 is a block diagram showing the drive circuit of FIG. 2. FIG.

6 is a configuration diagram showing an example of a case where a VAP is used as the image correction means in FIG. 1 and a stepping motor is used as a drive system.

FIG. 7 is a block diagram showing the drive circuit of FIG.

8 is a block diagram showing an example of a case where a memory control method for electronic correction is used as the image correction means in FIG.

FIG. 9 is a flowchart showing a control operation in the first embodiment of the present invention.

FIG. 10 is a flowchart showing a frequency detection operation in the first embodiment of the present invention.

FIG. 11 is a flowchart showing an operation of a main part in the first embodiment of the present invention.

FIG. 12 is a block diagram showing a schematic configuration of a shake correction apparatus according to a second embodiment of the present invention.

FIG. 13 is a flowchart showing the operation of the main part of the second embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration of a conventional shake correction apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Angular velocity detector 4 A / D converter 5 Integration circuit 8 Drive circuit 9 Image correction means 10 HPF 11 Phase / gain correction circuit 12 Operating state determination means 13, 14 Frequency detection means

Claims (2)

[Claims] 1. A shake correction device comprising a vibration detection means for detecting a vibration applied to the apparatus, a correction means for correcting the vibration based on an output of the vibration detection means, and a drive means for driving the correction means. In which a plurality of different detection levels for the output signal of the vibration detection means are provided, and frequency detection means for detecting the frequency at each detection level; and the output of the frequency detection means and the output of the vibration detection means A shake correction apparatus comprising: an operation state determination unit that determines an operation state of a device to be mounted and controls the correction characteristic of the shake by the drive unit. 2. The frequency detection means has a plurality of different detection levels for each of the angular velocity signal and the angular displacement signal output from the vibration detection means, and outputs the detection frequency obtained at each detection level to the operating state determination means. The operation state determination means is means for controlling the shake correction characteristics of the correction means and the drive means based on the output of the vibration detection means and the output of the frequency detection means. The shake correction apparatus according to Item 1.