JP2777616B2 - Image blur prevention device and image blur prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention prevents image blur caused by camera shake or the like.
Image blur prevention device used for image blur prevention
Related to the device. (Background of the Invention) Conventionally, a control device for stabilizing an image of a camera (preventing image blur) has been known.
Have been proposed. This generally involves controlling a lens system,
In response to radial vibration of
When configured as a control mechanism to correct image blur
There are many. For example, optical axis (shooting optical axis, viewfinder optical axis)
The vibration in the direction in which the camera is tilted with respect to
The acceleration signal is integrated by a signal processing system.
Depending on the obtained displacement signal (or speed signal), the lens
As a method for controlling the radial movement of the
A control device for stabilizing the image of the camera is configured. Here, the image stabilization is required for the so-called camera shake
Compensates for camera vibration at relatively low frequencies due to movement
To compensate for vibrations in this frequency band.
This is a necessary and sufficient condition for image stabilization. Here, the actual intensity distribution of camera shake vibration is about 1-2 Hz.
Although there are many ranges, generally 1 to 15
When the frequency band of about Hz is set as the integration target range of the integration circuit,
Often. Therefore, the controller for stabilizing the image
The signal processing system uses 1 to 3
Lens that detects low frequency vibration of about 15Hz and responds to this
An output signal for system drive is output. Concrete
Typically, a high-pass filter that passes the above-mentioned frequency band
An integrating circuit having a characteristic of the signal processing system
It is usually used as Here, an integrating circuit having filter characteristics is a product in a narrow sense.
If the divider itself has filter characteristics, or if the integrator
Connection of an independent filter circuit to
You may. By the way, it has the high-pass filter characteristics described above.
When using an integrating circuit, the phase error around the cut frequency
Generally, the difference may affect the control accuracy.
As described above, the frequency band in a strict sense (1-2 Hz)
Integrator with filter characteristics for a wider band
Roads are used to ensure the avoidance of the above effects
Often. For example, low frequency vibration of about 1 to 15 Hz
It seems to have a filter characteristic for. Also phase
Two or more that can be switched to further eliminate error effects
When the integration circuits of the above are used in combination, for example,
Further combined with an integrator with 15Hz filter characteristics
Used as an integrating circuit is a broadband analogy
For example, the gain in the range from 0.04 to 0.1 Hz to about 150 to 400 Hz
Often guaranteed. However, the integration circuit having the filter characteristic of the wide band pass is used.
When using roads, on the other hand,
Information (for example, based on intentional shooting
Information or information based on any impact on the camera
Information) may enter the input of the integrator and affect it
Means larger. As a result, the image stabilization purpose
Control device is the signal of the camera shake vibration that is the target signal
The lens system stabilizes in response to signals
Rather, it is difficult to cause the problem of being actively inhibited. Also, a sufficiently low frequency band (for example, 0.04 Hz as described above)
If the filter characteristics covered by
Since the path has a long time constant, image blur correction of lens system vibration is fixed.
It takes a long time to reach the normal state (for example, 25
sec) and it feels like using a real camera
There was also a problem that it did not fit. (Object of the Invention) The present invention has been made in view of the circumstances described above.
Can perform proper operation depending on the blurring condition.
Provide anti-shake device and anti-shake device
Trying to do it. (Summary of the Invention) In order to achieve the above object, first to
(4) Image blur prevention apparatus and device for preventing image blur according to the invention
Are characterized by the following configurations.
You. First, the image blur prevention device according to the first invention is provided with a first blur
First signal output means for outputting a signal corresponding to a frequency
And a second shake frequency different from the first shake frequency
Second signal output means for outputting a signal corresponding to
Prevents image blur according to the output of the first and second signal output means
And image blur prevention means.
is there. Further, the image blur prevention device according to the second aspect of the present invention is a
A first blur period in accordance with a step and an output of the blur detecting means;
First signal output means for outputting a signal corresponding to the wave number;
The first shake frequency is set according to the output of the shake detection means.
Output a signal corresponding to a second shake frequency different from the number
Second signal output means, and the first and second signal output means.
Image blur prevention means for preventing image blur according to the output of the step.
It is characterized by having. The device for preventing image blur according to the third invention is a
1st signal output for outputting a signal corresponding to 1 shake frequency
Force means and a second shake different from the first shake frequency.
Second signal output means for outputting a signal corresponding to a frequency
And an image buzzer according to the outputs of the first and second signal output means.
Control means for controlling the prevention means.
Is what you do. In the apparatus for preventing image blur according to the fourth invention,
A blur detecting means, and a first
First signal output for outputting a signal corresponding to the shake frequency
Means, and the first
A signal corresponding to a second shake frequency different from the shake frequency
Second signal output means for outputting the first and second signals.
Control means for controlling the image blur prevention means according to the output of the signal output means.
And control means. (Examples of the Invention) Hereinafter, examples of the present invention will be described. First, an outline of a camera vibration detection device according to an embodiment of the present invention
Is the acceleration signal obtained corresponding to the camera shake
With a filter characteristic that integrates a wider frequency band
From the integration circuit and the frequency band corresponding to the camera shake vibration
Has a low cut frequency as low as possible in the high band
And a high-pass filter to
Provided in parallel so as to receive as
The integration circuit depending on the input signal passed through the filter
Reset signal output means for resetting the reset signal. The integration circuit may be one, or two or more
It may be. In the case of two or more,
It is configured so that the low cut frequency of the
It is. For example, taking two integrators as an example, one
For the low cut frequency of the integrating circuit,
The cut frequency is set to a different value. The reason that the integrating circuit has the filter characteristic is that the product
The narrow integrator itself that constitutes the dividing circuit
Or independent of the integrator in a narrow sense
With the filter circuit connected
Is also good. The high-pass filter is used to prevent camera shake.
When the input of off-target signals increases,
Integration circuit, which is the main circuit that generates the compensation signal for
The integral output of the road is not suitable for the compensation
That is used to detect did
Thus, the low-cut frequency of the high-pass filter is
From the frequency band corresponding to the camera shake vibration to be detected
Is set to a higher frequency, corresponding to camera shake vibration
Improper signal input in the range higher than the frequency band
Set to a low frequency with sufficient response to force
Must be selected and set to satisfy the requirements of
It is necessary. Specifically, the camera shake vibration
Most of the intensity distribution is about 1 to 2 Hz.
Considering the phase error, the band pass
Do you often have a filter specialty?
In this case, the low cut of the high-pass filter
The frequency is appropriately selected and set within the range of 2 Hz to 15 Hz.
It will be. Generally, in the above case, about 3-10Hz
Degrees, preferably about 5 Hz in many cases. Depends on the input signal passed through the high-pass filter
Reset signal that outputs a signal to reset the integrating circuit
The output means is configured to output the image
It operates when fixed control cannot be performed properly. This
Detection of excessive input of inappropriate signal such as
By comparing the input with a predetermined threshold.
But can prevent the operation due to other noise
Therefore, the bandpass filter with reduced accuracy above 15-20Hz
And a comparator. The integrating circuit reset by the reset signal is
After returning to the initial state, the camera shake vibration is integrated again. Next, a detailed description will be given with reference to embodiments of the present invention. FIG. 5 is an image stabilization control device for a camera to which the present invention is applied.
1 shows an example of the configuration outline of FIG. In this example, the acceleration signal
Based on this, an integrated speed signal for compensating lens system vibration
This is an example in the case of being configured as a device for detecting. In the figure, 1 is the direction in which the camera is inclined with respect to the optical axis.
This is an acceleration sensor that detects the vibration of
The output from the sensor is converted to a speed signal through the signal processing circuit 2.
Actuate for integrating and controlling the movement of the lens system 4 in the radial direction
Is input to the router 3. As a result, the lens system 4
The lens system is driven in a direction opposite to the vibration of the
Stability of the transmitted image is achieved. FIG. 1 is configured as the signal processing circuit 2 of FIG.
1 shows a control circuit according to the present invention.
Received the acceleration signal at the input terminal and integrated it
A signal processing system for outputting a speed signal from the output terminal 6 is provided.
I have. The control circuit shown in FIG.
It consists of two components. The first component is used when an abnormal signal on the high frequency side is input.
High-pass filter 16 and window to prevent malfunction
C Comparator 17 is included. The second component is for input acceleration signal integration.
It includes a plurality of integrating circuits 19 to 23. The third component is the output of the integration circuits 19 to 23.
Switches 40 to 43 for monitor and signal selection,
Window comparators 44 to 47 are included. The fourth component removes unwanted signals on the low frequency side
Including a moving averager 52. First, the first component of the control circuit shown in FIG.
Will be explained. This first component is between the input terminal 5 and the OR gate 18.
A window comparator 7 connected in parallel to
High pass filter 16 and window comparator 17
ing. Here, the window comparator of 7 is excessive acceleration
Input (for example, lifting the camera, switching, turning on the power)
Prevents saturation of the integral value when
To recover the circuit, reset via OR gate 18.
As a first reset signal output circuit for outputting a reset signal.
It was made. High pass filter 16 and window comparator 17
Output a reset signal via OR gate 18.
The second reset signal output circuit of the present example.
You. This is due to extreme state changes such as when the power is turned on and panning.
To change the camera direction, etc.
The rectifier 7 picks up more strictly than the
This is to prevent the operation. The first or second reset signal output circuit is configured
An example of the specific configuration of the window comparators 7 and 17
As shown in FIG. That is, an input signal is received at the input terminal 8, and the input signal is
If the signal is too large, it is preset by resistors 9 and 10.
The comparator 11 compares the input signal
The comparator 11 outputs a “Hi” signal by detecting an excessive
And set the OR gate 12 output, that is, the reset signal, to "Hi".
I do. If the value is excessively negative, resistors 13 and 14 and comparator 15
Thus, the OR gate 12 output, that is, the reset signal output
To “Hi”. The high-pass filter 16 of the present example has a high frequency of 5 Hz or more, for example.
It is configured as having a pass filter characteristic. this
Says that the vibration of camera shake is about 1-10Hz
Even though the actual intensity distribution is often 1-2 Hz,
The range of about 1-2 Hz is removed by a high-pass filter.
If the frequency is higher than this,
Of actions such as camera direction change due to computerization or panning
Or input of excessive acceleration signal that may occur at the end
Is detected by the window comparator 17
Then, the reset signal output is set to “Hi”. The reset signal output as described above includes a plurality of reset signals described later.
Input to each of the integrators and reset these integrators.
(Return to the initial state). Note that the reset signal is
Use for other purposes not only for resetting the integrator
You may. For example, in this example, the reset signal is
Monitor circuit, output signal selection circuit, moving averager
It is also used as a reset signal.
You. The second component is constituted by integrating circuits 19 to 23.
You. These five integrators 19 to 23 have low cut frequencies in order.
The filter characteristics given differently in the next step
A combination of two things. That is, in the steady state
The low cut frequency of each integrating circuit is 2H for the integrating circuit 19.
z, integration circuit 20 is 1 Hz, integration circuit 21 is 0.5 Hz, integration circuit 22
Is 0.1 Hz, and the integration circuit 23 is 0.01 Hz. Note that these integration circuits provide a long time for stable
Is it the purpose to suppress this as much as possible because it tends to be necessary
In this example, the time constant is cut off at the time of the rise of each integrating circuit.
The structure of the switching system is adopted. For example, the integration circuit 22 is initially
Low cut frequency is 0.5 Hz or less 0 dB / sec for 8 seconds
Works as an integrating circuit for
Early decay, and then the steady-state integrator
Is to work as. Similarly, the integration circuit 19
3 Hz for 1 second, the integrator 20 initially 2 Hz for 2 seconds, the integrator 21
1 Hz for the initial 4 seconds, and 0.1 Hz for the initial 15 seconds.
Early attenuation of the initial error as a cut filter,
Thereafter, the state is shifted to a steady state. FIG. 3 shows an example of a schematic configuration of the integration circuit of this embodiment.
And the integrator using the operational amplifier 24 and capacitor 25
Combining resistor 26 for number and connecting resistor 27 on the input side
Have been. The input acceleration signal from the input terminal 30 is
Output from output terminal 31 as speed signal
Is done. Reference numeral 32 in FIG. 3 indicates a reset signal input terminal.
The reset signal from the OR gate 18
Switch 34 is turned on and the integration circuit is cleared
After the reset, integration is performed again.
ing. In this example, the fall-down of the reset signal
(Fall-down) to make the monostable multivibrator 35
Oscillation is performed for a predetermined time (for example, 8 seconds), and "H"
Turn on / off the switch 39 of the integration circuit with the "i" pulse
This causes the resistor 28 to work, and in the example of the integration circuit 22,
Time constant integration is realized. Also this integration circuit
22 is in a steady state after 8 seconds (other integration
The time required for the circuit to reach a steady state and the short and long time constant
The same except for the differences)
A signal from terminal 37 in FIG.
Output). That is, the monostable multivibration
Both the Q output of data 35 and the reset signal are turned off.
Sometimes, the NOR gate 36 outputs a steady state transition signal of the terminal 37.
Output. The window comparator indicated by reference numeral 38 in FIG.
The comparator calculates the product of the integrating circuit by comparing with a predetermined value.
Minute saturation is detected, and at the time of the saturation,
A set operation is performed. Therefore
This window comparator 38 outputs the third reset signal.
It constitutes a power circuit. Referring back to FIG. 1, in this example, as described above,
The provided plurality of integrating circuits 19 to 23 have a low cut frequency.
Are set to have different filter characteristics
Due to various time constants, the long time constant
Integrators will take longer
You. Therefore, in this example, when the integration circuit rises (power supply
ON, at the end of reset) only for high frequency vibration isolation
And then the transition of each integrating circuit to the steady state
To the integrator that extends the compensation band to the lower frequency side.
The system is shifted to the next switching. The configuration for this in the present example is the steady state in FIG.
Output from terminal 37 of each integrating circuit output at the end of state transition
Due to the steady state transition signal applied, as shown in FIG.
By changing the switches 40 to 43 sequentially.
Given as a configuration. That is, two seconds after the rise of the apparatus of this example, the integration circuit
Switch 40 is turned on by the steady state transition signal output from 20.
Switching, output from the integration circuit 19 to the output terminal 6
To the output terminal 6
To the output state, and the output is similarly shifted sequentially.
Thus, the control is realized. Next, the third component of the control circuit of the present embodiment,
A monitor for monitoring the difference between the integration outputs of the integration circuits 19 to 23.
And any one of the integration circuits according to the difference.
Output signal selection circuit that selects and outputs the
Will be described. This monitor circuit and output signal selection circuit of this example
Switches 40 to 43 of FIG. 1, differential window comparator
44-47. In this example, the image is stable against camera shake
In order to achieve high precision control,
The frequency band of camera shake vibration (for example, 1
~ 15Hz) wide enough frequency band (eg 0.01Hz
~) Preparing an integrating circuit with covered filter characteristics
There is a feature that. But such filter characteristics
If only the integration circuit having
Compensation to prevent camera shake is a factor other than unnecessary camera shake
The base acceleration signal (for example, 0.01 to 1 Hz)
There is a possibility that adverse effects due to contamination may be caused. In this case, the long time constant
This integration circuit responds to signals other than camera shake
Integrates, and its effect is greatly reduced due to the long time constant
It takes a long time without decay. Therefore, the long time constant integration
It is desirable to adjust and realize the proper use of the circuit. What
Realization of high-precision control as described above and mixing of non-target signals
To fine-tune the trade-off with prevention,
Provide as many integrators with different cut frequencies as possible
It is preferable from the viewpoint of the embodiment. The signal selection circuit in the present example configured from the above viewpoints
The differential window comparators 44 to 47 forming a part of
For example, the differential window comparator 47
As an example, it is configured to operate as follows
I have. Now, the integrating circuit 22 is added to the differential window comparator 47.
And the outputs of 23 are input. In this case, the book
The output signal from the output terminal 6 of the entire control circuit of the example is integrated
The integral output from the road 23 is obtained. Here, the signal containing the frequency of 0.25Hz ~ 0.01Hz is the input terminal
5 is input in response to this input signal.
The output of the integrated circuits 22 and 23 is low cut.
Because the frequency is 0.1 Hz for the former and 0.01 for the latter
From the difference in response to the frequency of 0.25 Hz to 0.01 Hz
A corresponding difference is produced. This is especially true when the pulse
When it is a step-like input,
And stand out. That is, the former is over 10 seconds, the latter over 100 seconds
Works to preserve the components of the input. Such a long time
The history becomes inconvenient. Here, this difference is a predetermined "threshold"
Is exceeded by the differential window comparator 47.
The error window comparator 47
Output to the port 47 and reset the integrating circuit 23.
You. 47 is an example of the configuration of the above differential window comparator
Is shown in FIG. 6, for example. That is, two signals (in this case, integration
The difference between the signals from the circuits 22 and 23)
The difference between the above two signals is determined in advance by the
The output is generated when the set value (threshold) is exceeded. In this example, the resistor 82 and the capacitor 83 in FIG.
Is provided to provide a time constant for detection.
This is useful for detecting (steady-state) deviations.
For example, if two signals have a high frequency or a short
I'm trying. The “threshold” is used in the entire control circuit.
Designed according to the number of integrating circuits, filter characteristics, etc.
Given. This causes the switch 43 to return to the initial state (the state shown in the figure).
And the integral output signal from the output terminal 6 of the overall control circuit is
The output signal is switched to the output signal from the integration circuit 22. And two
Monitor the output of the integrator circuit, this time with a differential window
Performed on integrals 21 and 22 in comparator 46
Will be. In this way, the differential window controller
Parators 44 to 47 are related to the switching state of switches 40 to 43
To monitor the output signal of the corresponding integrator and
(Depending on the input signal state)
Reset the corresponding integrator from the output state of the two integrators
Is performed through the OR gates 48 to 51. The above-described differential window comparators 44 to 47
Is stable by giving a time constant of about 1 second, for example.
It is preferable to make the following. Next, the fourth component of the control circuit of the present embodiment, namely, the camera
Improper control that responds to panning operation of
A signal processing system for removing the signal will be described. The specific purpose of this signal processing system is as follows. For example, when the camera is panning,
The signal input to the controller is
"Excluded signal" (moving
Signal indicating status = intentional panning operation signal)
And When such a signal is input, the "target signal"
To achieve stable image blur stabilization control.
preferable. The circuit for this in the present example is the moving averager of FIG.
52, a differential amplifier 53 and a switch 55.
You. When the switch 55 is in the mode shown in FIG.
The signal is output as it is from terminal 6, but the moving averager 52
When operating, the switch 55 is connected to line 54 (terminal
The output from the differential amplifier 53 is output from the terminal 6 by the signal of 58).
It is configured to be able to switch to the output mode. A detailed outline of the moving averager 52 in this example is shown in FIG.
Have been. The moving averager 52 first resets the reset terminal 56.
A flip-flop circuit (hereinafter abbreviated as FF)
Reset) and set the output of terminal 58 to "Lo"
Reset and reset analog shift registers 59 and 60
And reset the counter 61. This makes the moving flat
The equalizer 52 is in the cleared initial state. From the input terminal 62 to the moving averager 52 after this state
Input (input of this input terminal is the signal output selection circuit
Integration output from one of the integration circuits 19 to 23
Output), this input is the clock from oscillator 63.
The above analog shift register is sequentially synchronized with the lock pulse.
Serial-in to the
In addition, another analog shift register 60 has a reference signal.
Signal from terminal 72 in synchronization with the clock pulse.
(Serial-in). In this example, this analog
The log shift register 60 cooperates with the divider 69 at the subsequent stage to multiply the product.
This is used to normalize the minute addition value. You
That is, as described later, the addition time value signal is
By outputting, it is possible to calculate only the moving average in the steady state.
To calculate the approximate moving average at the initial rise of the moving averager 52.
It has a characteristic structure that can be conveniently performed
Have been. In the pair of analog shift registers 59 and 60,
The input signal is sequentially input at every clock pulse input,
Shifted and updated, serial-in from input terminal 62
Time series signal is parallel information by resistance networks 64 and 65
Is expanded to "parallel out"
Will be. And this parallel-out signal is a resistor network
The signals are input to adders 66 and 67 at predetermined gains via 64 and 65, and
In the divider 69, the moving addition value (input from the adder 66)
Is normalized by the addition time value (input from the adder 67),
Eventually, it will be output as the output signal of the moving averager.
You. An example of the moving average is as follows.
If you need a
The parallel-out signal from the shift register 59 is gain 1
And the same signal corresponding to 0.7-1.2 seconds is attenuated sequentially
The ratios are input to adders 66 and 67, respectively.
And normalization to obtain a one-second moving average signal.
Can be. As described above, the moving averager 52 in this example is an analog
Addition time value is created by shift register 60
For the predetermined moving average early in its rise
Before reaching the time, the moving average signal (approximately
A moving average signal)
There is also. The flip-flop circuit (FF) 57 in FIG.
The signal for switching the switch 55 is sent to the line 54 (terminal
58), and in this example, the oscillator
The clock pulse from 63 is counted by the counter 61, for example,
In this example, the moving average of the type that calculates the moving average of 1 second
Set FF57 at 0.8 seconds for
The switch 55 is configured to be switched. The signal output from the moving averager 52 having the above configuration is
The differential amplifier 53 shown in FIG.
The difference from the integral output from the integrator, that is, the AC component
(Vibration component), and the switch 55
When switched, the AC component is output from terminal 6.
It is. Note that when the counter counts for 0.8 seconds as described above,
When switching the switch 55, the above substantially moving average signal is set to 0.
It will be output after 8 seconds. In this example using the above moving averager, the product
The entire separation circuit uses only the AC velocity component for image stabilization.
Can be output as a compensation signal of
As shown in Fig. (C), from a general time constant filter
Although it has a folded side band,
Frequency (one second before in the time domain as a reciprocal)
Creates a compensation signal with excellent gain characteristics that eliminates previous history.
The characteristic that it can be taken out is obtained. Especially in this example
In this case, the resistance is partially attenuated by the resistance networks 64 and 65.
Moving average with gain (in the above example, in the range of 0.7 to 1.2)
Reduced folded sidebands
Some features can be done. In the moving averager used in this example, 0 to 0.7
Seconds signal with a gain of 1 and the same for 0.7 to 1.2 seconds.
The signal should be input to the adder at a rate that attenuates sequentially.
The reason is as follows. The moving averager used in this example is qualitatively
Output the average of the
The accuracy of the average value depends on whether the signal is input or not.
Will be different (for example, if the average is 1 second,
Signal near 1 second was 0.99 seconds ago or 1.01 seconds ago
The average value accuracy differs depending on the case). This problem is a problem as in this example.
Average inclination of moving components affecting detection of camera shake of camera
Direction, especially as a relatively short moving average
It is not preferable when taking out. In addition, the above moving averager is a simple one-second average (No. 7
(See Fig. (D)).
The problem with frequency characteristics as shown in FIG.
is there. That is, a specific frequency with 1 Hz as the Nyquist frequency
The gain tends to change suddenly with each number, and input near that frequency
The output varies extremely with force. Here, the moving averager is shown, for example, in FIG. 7 (b).
Attenuate in the range of 0.75 seconds to 1.25 seconds
And the average accuracy of the one-second average is increased as shown in FIG.
In addition, frequency vs. frequency that suppresses extreme changes in gain for each specific frequency
Moving averager with smooth filter characteristics
can do. Therefore, in this example, it has the above damping characteristics.
They decided to use a moving averager. Also above
After resetting by giving attenuation characteristics from 0.7 seconds,
As a filter of about 1.2Hz from 0.8 seconds later, about 1 second later
0.8Hz filter after 1.2 seconds as 1Hz filter
-Smooth against frequency and time as described above
Filter can be realized. That is, in this example
Moving averager has smooth filter characteristics and time characteristics
Yes, and output can be enabled from 0.8 seconds within one second
It has the feature of In FIG. 1, provided in connection with the moving averager 52.
The window comparator 69 is
Output from 52 (output from divider 68 in Fig. 4) is abnormal
If a large DC component is included, the
This is for resetting the long time constant integrator 23. In other words, when such output contains an abnormally large DC component,
Input information derived from operations such as panning
Since this is the case of entering terminal 5, such information is integrated.
Long time when it is inserted in the output and keeps a long history
By resetting the constant integrator 23, the camera shake
To prevent the generation of signals unrelated to the purpose of motion compensation.
It is. Note that in this example, at the same time,
The moving averager 52 is also reset to control with a short time constant.
I can do it. In the present embodiment described above, camera shake
The integrated vibration acceleration is integrated into the velocity to
Output a compensation signal (speed signal) for movement control
Only signals that are substantially due to camera shake
High-precision image stabilization control is realized when
When other signals are mixed,
It is possible to prevent undesired control operations from occurring
This has the effect of obtaining the following characteristics. The present invention is not limited to the configuration of the above embodiment.
Needless to say, for example, the window described above
For comparators or high-pass filters,
If it is desirable to have a characteristic with a constant time constant
There is a case. The integration circuit used in the present invention has a short and long length.
The change of the time constant can be set to an appropriate value by design.
Therefore, a balun that is stable for a short time and stable for a long time
Product with narrow bandpass filter characteristics
A dividing circuit can also be used. The moving averager used in the above embodiment is
Multi-series, multi-time constant group by linking to switches 40 to 43
The moving averager can also be
Predetermined integration circuit when abnormal signal input is detected
In addition to resetting
To the operational amplifier of the
In the form of feedback as current to the inverting input terminal
The DC component may be added or subtracted as auxiliary input.
No. Even with a second-order integrator or a configuration with two stages of integrators,
The idea of a filter with set system and various filters is
It is the same, and either can be given by design,
You may make it carry. (Correspondence between Invention and Embodiment) In the above embodiment, the acceleration sensor 1
The image forming lens 4 is used as an image blur prevention means according to the present invention.
In the stage, any two of the integrating circuits 19 to 23 are provided according to the present invention.
The output terminal 6 is connected to the first and second signal output means according to the present invention.
They correspond to control means, respectively. (Effects of the Invention) As described above, according to the present invention, image blur prevention means
Can perform the appropriate anti-shake operation according to the shake signal.
You can do it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an example of a schematic configuration of a camera vibration detecting apparatus according to the present invention, FIG. 2 is a diagram showing a specific example of a window comparator, and FIG. FIG. 4 is a block diagram showing a moving averager, and FIG.
FIG. 5 is a diagram showing an example of a schematic configuration of an image blur prevention device of a camera to which the present invention is applied, FIG. 6 is a diagram showing a specific example of an operation window comparator, and FIGS.
(D) is a diagram for explaining the filter characteristics of the moving averager. 1: Accelerometer, 2: Signal processing circuit 3: Actuator, 4: Imaging lens 5: Input terminal, 6: Output terminal 7: Window comparator 8: Input terminal, 9, 10: Resistance 11: Comparator, 12: OR gate 13, 14: resistance, 15: comparator 16: high-pass filter 17: window comparator 18: OR gate, 19 to 23: integration circuit 24: operational amplifier, 25: capacitor 26: resistor for long time constant, 27, 28: resistor 30 : Input terminal, 31: output terminal 32: reset input terminal 33: OR gate, 34: switch 35: monostable multivibrator 36: NOR gate, 37: output terminal 38: window comparator 39: switch, 40 to 43: switches 44 to 47 : Differential window comparators 48 to 51: OR gate, 52: Moving averager 53: Differential amplifier, 54: Line 55: Switch, 56: Reset terminal 57: Reset flip-flop (FF) 58: Terminal 59, 60: Analog shift Register 61: Counter, 62: Input terminal 63: Oscillator 64, 65: Resistor network Click 66,67: adder, 68: divider 69: window comparator 70: gate 80: Differential amplifier 81: the window comparator 82: resistor, 83: capacitor

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuki Konishi 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Tamagawa Office of Canon Inc. (72) Inventor Takashi Kawabata 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture In-house (58) Field surveyed (Int. Cl. ⁶ , DB name) G03B 5/00

Claims (1)

(57) [Claims] A first signal output unit that outputs a signal corresponding to the first shake frequency; and a second signal output unit that is different from the first shake frequency.
A second signal output means for outputting a signal corresponding to the shake frequency, and an image blur prevention means for preventing image blur according to the outputs of the first and second signal output means. Image blur prevention device. 2. Blur detection means, first signal output means for outputting a signal corresponding to a first shake frequency in accordance with an output of the shake detection means, and first shake in response to an output of the shake detection means. A second signal output means for outputting a signal corresponding to a second shake frequency different from the frequency;
An image blur prevention device comprising: an image blur prevention unit that prevents image blur according to an output of a second signal output unit. 3. A first signal output unit that outputs a signal corresponding to the first shake frequency; and a second signal output unit that is different from the first shake frequency.
A second signal output unit that outputs a signal corresponding to the shake frequency of the first and second control units, and a control unit that controls the image blur prevention unit according to the outputs of the first and second signal output units. A device for preventing image blur. 4. Blur detection means, first signal output means for outputting a signal corresponding to a first shake frequency in response to an output of the shake detection means, and first shake frequency in response to an output of the shake detection means Second signal output means for outputting a signal corresponding to a second shake frequency different from the first and second shake frequencies;
Control means for controlling the image blur prevention means in accordance with the output of the signal output means.