JP3417851B2 - Image blur correction control device and image blur correction control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a correction control of image blur caused by a blur or the like provided in an optical instrument such as a monocular.

[0002]

2. Description of the Related Art Conventionally, an optical instrument having a function of correcting image blur caused by camera shake has been known. The image blur correction function has a correction optical system that corrects the deviation of the observed image,
The image shake of the optical instrument is canceled by driving the correction optical system by the actuator in the direction in which the deviation of the observed image due to the angular shake of the optical axis of the optical instrument is canceled.

[0003]

When an image blur occurs at a speed exceeding the maximum speed of driving the correction optical system by the actuator in such an optical instrument, the correction optical system corrects the image blur. It is driven at the maximum speed in the direction that cancels the movement of the optical axis of the optical instrument. In such a situation, even if the speed of image blur gradually decreases and becomes slower than the maximum speed of driving the correction optical system, or starts to shake in another direction, the correction optical system still remains at the maximum speed in the same direction. The phenomenon that it continues to be driven occurs.
That is, a phenomenon occurs in which the correction optical system is driven at a speed higher than the speed at which it should be originally driven, or is driven in a direction opposite to the direction in which it should be driven.
As a result, there is a problem in that a violent image blur is caused, and a visually observed image is extremely uncomfortable for the user.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an image blur correction control apparatus and method in which image blur correction control is always performed stably.

[0005]

SUMMARY OF THE INVENTION An image blur correction controller according to the present invention integrates the angular velocity detection means of the optical axis deflection of an optical instrument and the output of the angular velocity detection means to convert it into the deflection angle information of the optical axis. Of the correction optical system for correcting the shake of the observed image, the position information acquisition means of the correction optical system, and the deflection angle information of the optical axis output by the integration means and the correction optical system output by the position information acquisition means. Control means that drives the correction optical system so that the difference from the position information is eliminated, and the speed of the optical axis shake
Is the maximum from the value that exceeds the maximum driving speed of the correction optical system.
And a replacing means for replacing the output value of the integrating means with a value substantially equal to the output value of the position information acquiring means when the value changes to a value lower than the speed .

[0006]

An image blur correction controller according to the present invention
Is the angular velocity detecting means for the deflection of the optical axis of the optical instrument,
The output of the detection means is integrated and converted into deflection angle information of the optical axis.
Integrating means and a correction optical system for correcting the blurring of the observed image,
Output by the position information acquisition means of the correction optical system and the integration means
Correction output from deflection angle information of optical axis and position information acquisition means
Corrected optics to eliminate the difference from the position information of the optical system
After starting the control means for driving the system and the correction optical system,
Each time a fixed time has passed, the output value of the integrator is used as position information.
Replacement means for replacing the output value of the acquisition means with a value substantially equal to
It is characterized by having.

Preferably, the replacing means acquires the position information so that the driving direction of the correction optical system up to that time at the time of replacing the output value of the integrating means with a value substantially equal to the output value of the position information acquiring means is maintained. A predetermined value is added to or subtracted from the output value of the means to replace the output value of the integrating means.

When the driving direction is the first direction, for example, when a predetermined value is added to the output value of the position information acquisition means and the driving direction is the second direction which is 180 degrees opposite to the first direction,
The predetermined value is subtracted from the output value of the position information acquisition means.

Preferably, the correction optical system is driven by a step by a predetermined amount by the control means, and the predetermined value is set to be larger than a threshold value serving as a reference for whether or not the correction optical system is step-driven. .

[0011]

[0012]

An image blur correction control method according to the present invention comprises a first step of detecting an angular velocity of a blur of an optical axis of an optical instrument,
The second step of integrating the angular velocities and converting it into the deflection angle information of the optical axis, the third step of detecting the position of the correction optical system for correcting the deviation of the observed image, the deflection angle information of the optical axis and the correction optical system A fourth step of driving the correction optical system to correct the image shake so that the difference from the position information is eliminated, and in the fourth step, the speed of the shake of the optical axis is adjusted by the correction optical system.
Change from the value that exceeds the maximum speed of the drive to the value that is lower than the maximum speed.
When it turned into, and replaces the deflection angle information of the optical axis to the position information of the correction optical system.

[0014]

An image blur correction control method according to the present invention
Is the first step for detecting the angular velocity of the deflection of the optical axis of the optical instrument.
And the angular velocity are integrated and converted into deflection angle information of the optical axis.
2nd step and a correction optical system for correcting the deviation of the observed image
3rd step of detecting the position of and the deflection angle information of the optical axis
Correction to eliminate the difference between the position information of the correction optics and
The fourth step of driving the positive optical system to correct the image blur
Prepare, and in the 4th step, a fixed time elapses periodically
Each time, the deflection angle information of the optical axis is corrected and the position information of the optical system is corrected.
It is characterized by replacing with.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the present specification, "vertical" refers to a vertical direction in a normal use state of an optical device including an image blur correction mechanism according to an embodiment of the present invention, and "horizontal" is a direction orthogonal to "vertical". Refers to. FIG. 1 is a perspective view showing an image blur correction mechanism for a monocular or a camera lens to which the first embodiment according to the present invention is applied. The correction lens 28 is held by the lens support frame 25. The lens support frame 25 is a flat plate having a flat surface 25X orthogonal to the optical axis OP of the correction lens 28, and the shape of the cross-sectional outer contour in a plane parallel to the flat surface is substantially rectangular. The upper end surface 25A of the lens support frame 25 in FIG. 1 is perpendicular to the plane 25X and parallel to a surface extending in the lateral direction including the optical axis OP. Also,
The right end surface 25B of the lens support frame 25 in FIG. 1 is perpendicular to the plane 25X and parallel to a surface extending in the vertical direction including the optical axis OP. Upper end surface 25A and right end surface 25B
Are adjacent to each other and orthogonal to each other, and are recesses 26 and 27, respectively.
Is provided.

In the optical apparatus to which the present embodiment is applied, the light flux that has passed through the objective lens passes through the correction lens 28, and is converted into an eyepiece lens through an image inverting optical system composed of, for example, Porro prism or roof prism. Be guided. That is, the lens support frame 25 is arranged in the optical device so that the correction lens 28 is positioned between the objective lens and the image inverting optical system. Further, in the present specification, the “reference position” refers to a position where the optical axis OP of the correction lens 28 coincides with the optical axes of other optical systems.

A first linear actuator 131 is disposed in the recess 26. The first direct-acting actuator 131 is, for example, a direct-acting solenoid, and includes a drive coil housing 131a and a shaft 131b that moves the drive coil housing 131a forward and backward. The direction in which the shaft 131b moves back and forth and the driving force are determined by the direction and magnitude of the voltage applied to the drive coil (not shown) in the drive coil housing 131a. The drive coil housing 131a is fixed to the inner wall surface (not shown) of the outer frame of the optical device, and the tip of the shaft 131b is in contact with the surface 26a.

A second linear actuator 132 is disposed in the recess 27. The second direct-acting actuator 132 has the same configuration as the first direct-acting actuator 131, and the shaft 132b has a large voltage applied to a drive coil (not shown) in the drive coil housing 132a. The forward / backward movement operation is performed based on the direction and the direction. The drive coil housing portion 132a is fixed to the inner wall surface (not shown) of the outer frame of the optical device, and the tip of the shaft 132b is in contact with the surface 27a.

On the right end surface 25B, holes 29a and 29b extending in parallel to the upper end surface 25A toward the inside of the lens support frame 25 and having a predetermined depth are formed near the upper end portion and the lower end portion. The U-shaped guide bar 61 has lateral guide portions 61a and 61b whose axial directions are parallel to each other.
And a vertical guide portion 61c connecting the horizontal guide portions 61a and 61b. The axial length of the vertical guide portion 61c is substantially equal to the distance between the holes 29a and 29b.
In the hole 29a, the lateral guide portion 61a of the guide bar 61,
Lateral guide portions 61b are slidably inserted in the holes 29b.

The vertical guide portion 61c of the guide bar 61 is inserted through the projection portion 11 formed on the inner wall surface of the outer frame of the optical device, and is supported by the projection portion 11 so as to be reciprocally movable in the vertical direction.

A pin 151 projects near the corner where the upper end surface 25A of the lens support frame 25 and the right end surface 25B intersect at right angles. The end 151a of the coil spring 152 is attached to the pin 151.
Is fixed. The other end portion 152b of the coil spring 152 is hooked on a protrusion (not shown) on the inner wall of the outer frame of the optical device, and the lens support frame 25 faces the optical axis point in a plane perpendicular to the optical axis OP. It is biased toward 45 degrees. That is, the coil spring 152
Shaft 131b of first linear actuator 131
And the shaft 1 of the second linear actuator 132
The ball at the tip of 32b is always the surface 26a of the recess 26,
The lens support frame 25 is biased so as to contact the surface 27a of the recess 27 with a uniform biasing force.

The lens support frame 25 is provided with a first slit 208 for lateral position detection and a second slit 211 for vertical position detection. First slit 20
8 is the shaft 131 of the linear actuator 131 whose longitudinal direction of the cross-sectional shape cut along a plane parallel to the surface 25X is first.
The second slit 2 extends in a direction orthogonal to the advancing / retreating direction of b.
Reference numeral 11 denotes the shaft 13 of the linear motion type actuator 132 whose longitudinal direction of the sectional shape cut along a plane parallel to the surface 25X is second.
It extends in a direction orthogonal to the forward / backward direction of 2b. First L
The ED 207 is arranged at a position spaced apart from the lens support frame 25 by a predetermined distance and at a position corresponding to the first slit 208, and on the opposite side of the first LED 207 across the lens support frame 25, a first one-dimensional PSD is provided. (Position Se
A passive device (204) is provided. The second LED 210 is arranged at a position spaced apart from the lens support frame 25 by a predetermined distance and at a position corresponding to the second slit 211, and the second LED 210 is sandwiched by the lens support frame 25.
A second one-dimensional PSD 209 is arranged on the opposite side of 210.

The lateral position of the lens support frame 25 is the first
The luminous flux emitted from the LED 207 of the first slit 2
The position of the lens support frame 25 in the vertical direction is detected by the position of passing through 08 and is irradiated onto the first one-dimensional PSD 204, and the light flux emitted from the second LED 210 passes through the second slit 211 and It is detected by the position irradiated on the two-dimensional PSD 209.

When a voltage in a specific direction is applied to the drive coil of the drive coil housing 131a of the first linear actuator 131, the shaft 131b projects in the x1 direction and the lens support frame 25 is displaced in the x1 direction. When a voltage in the opposite direction is applied to the drive coil, the shaft 131b is pulled in the x2 direction, and the lens support frame 25 is displaced in the x2 direction by the urging force of the coil spring 152.

When a voltage in a specific direction is applied to the drive coil of the drive coil housing portion 132a of the second linear actuator 132, the shaft 132b projects in the y1 direction and the lens support frame 25 is displaced in the y1 direction. When a voltage in the opposite direction is applied to the drive coil, the shaft 132b is pulled in the y2 direction, and the lens support frame 25 is displaced in the y2 direction by the biasing force of the coil spring 152.

FIG. 2 is a diagram showing a circuit configuration for performing lateral image blur correction in the control circuit for image blur correction of the monocular according to the first embodiment. The CPU 200 is a microcomputer that controls the entire image blur correction control. Switch 2
Reference numeral 01 is a switch for starting the image blur correction control when it is turned on, and the output signal thereof is the input port PI1 of the CPU 200.
Entered in. The lateral gyro sensor 202 outputs a signal indicating the moving direction and the moving amount of the optical axis of the monocular in the lateral direction due to camera shake or the like, that is, the angular velocity. The lateral gyro sensor 202 includes a lateral amplifier 20.
3 is connected, and the angular velocity signal of the optical axis output from the lateral gyro sensor 202 is amplified. The horizontal amplifier 203 is connected to the CPU 200, and the amplified signal of the angular velocity of the horizontal optical axis output from the horizontal amplifier 203 is input to the first AD conversion input terminal AD1.

The first one-dimensional PSD 204 outputs a signal indicating lateral position information of the correction lens 28 as described above. The first one-dimensional PSD 204 is connected to the CPU 200, and the position information signal output from the first one-dimensional PSD 204 is input to the second AD conversion input terminal AD2. The AD conversion input terminal includes an AD conversion circuit that converts an analog signal into a digital signal, and the input analog signal is AD based on a command from the CPU 200.
It is a terminal for converting into a digital signal by a conversion circuit.

The oscillator 205 has A at the first AD conversion input terminal AD1 and the second AD conversion input terminal AD2.
An interrupt signal that determines the D conversion timing is output. The oscillator 205 is connected to the CPU 200, and the interrupt signal is input to the external interrupt terminal INT. That is, according to the interrupt signal input to the external interrupt terminal INT, interrupt processing is performed, for example, every 1 msec (millisecond), and the signals input to the first AD conversion input terminal AD1 and the second AD conversion input terminal AD2 are It is converted to digital and read by the CPU 200.

First AD conversion input terminal AD1 and second AD conversion input terminal AD1
The signal digitally converted at the AD conversion input terminal AD2 is subjected to predetermined processing and output from the DA conversion output terminal DA1. The lateral power amplifier 206 is connected to the DA conversion output terminal DA1, and the DA conversion output terminal DA1 is connected.
The output signal from is power amplified. The DA conversion output terminal is provided with a DA conversion circuit that converts a digital signal into an analog signal, and the digital signal stored in each register of the CPU 200 is D based on the instruction of the CPU 200.
It is a terminal for converting into an analog signal by the A conversion circuit and outputting it. Further, the lateral power amplifier 206 includes the first actuator 1 for driving the correction lens 28 in the lateral direction.
31 is connected. That is, the correction lens 28 is D
Based on a signal obtained by power-amplifying the output signal of the A-conversion output terminal DA1, the first actuator 131 drives it laterally.

Further, the CPU 200 has the integration register 22.
1, correction optical system position register 222, and ROM 223
Is equipped with. The integration register 221 is a register that stores a value obtained by time-integrating the angular velocity signal output from the lateral gyro sensor 202, and is used to obtain shake (optical axis shake) angle information of the monocular. The correction optical system position register 222 is a register that stores the position information of the correction lens 28 output from the first one-dimensional PSD 204. The ROM 223 stores the maximum speed information of the correction lens 28 and the like. The maximum speed of the correction lens 28 is the maximum value of the speed of the correction lens 28 that can be driven by the first and second direct-acting actuators 131 and 132, and the value obtained in advance by experiments or the like is stored in the ROM 223. ing.

Although not shown in FIG. 2, the CPU 2
A vertical gyro sensor, a vertical amplifier, and a vertical power amplifier for correcting the image blur in the vertical direction are connected to 00, and the same processing as the above-described image blur correction in the horizontal direction is performed. Similarly to the first actuator 131 connected to the horizontal power amplifier 206, the second actuator 132 is connected to the vertical power amplifier, and based on the drive signal output from the vertical power amplifier. Then, the second actuator 132 is driven, and the image shake in the vertical direction is corrected.

FIG. 3 is a flowchart showing a correction control processing procedure in this embodiment, and FIG. 4 is a flowchart showing an interrupt processing in the correction control of this embodiment.
In the flow chart, the excessive speed flag is a flag that is set when the speed of image blur exceeds the maximum speed of driving the correction lens 28, and is set in a specific bit in a specific memory.

The program is started by the CPU 200 when the power of the monocular body is turned on. In step 301, it is determined whether or not the switch 201 is pressed. If it is pressed, the process proceeds to step 302, and if it is not pressed, no new processing is performed. In step 302, the excessive speed flag and the integration register 221 are initialized, and then in step 303, the interrupt permission mode is set.

In step 304, it is determined whether or not the switch 201 is pressed. If the switch 201 is not pressed, the process proceeds to step 305, and the interrupt non-permission mode is set. On the other hand, if the switch 201 is pressed, no new processing is performed while the interrupt permission mode is set. That is, when the interrupt permission mode is set, the interrupt permission mode is always maintained while the switch 201 is kept pressed.

When the program shown in FIG. 4 is started and interrupt processing is performed, in step 401, the input signal of the first AD conversion input terminal AD1 (horizontal gyro sensor 20
2 output signal) is digitally converted into an integration register 221.
Is added in. The addition process in the integration register 221 is performed in consideration of the shake direction of the optical axis. That is, for example, if the shake to the right is positive and the shake to the left is negative, and first shakes to the right and then shakes to the left, in the case of shake to the right, the previous value is positive. Add the values,
In the case of a shake to the left, a negative value is added to the previous value, that is, subtracted. As described above, the deflection angle information of the monocular,
That is, data indicating the shake angle from the original angular position of the optical axis is stored in the integration register 221. Further, in step 402, the input signal of the second AD conversion input terminal AD2 is digitally converted, and the positional information of the correction lens 28, that is, the data indicating the distance from the position of the optical axis of the monocular is corrected optical system position register 222. Stored in.

Next, at step 403, the speed of image blur is compared with the maximum driving speed of the correction lens 28 stored in the ROM 223. The speed of image blur is an appropriate multiplication of a signal obtained by power-amplifying the angular velocity of the optical axis of the monocular output from the lateral gyro sensor 202, which is input to the first AD conversion input terminal AD1, and is then multiplied on the image plane. This corresponds to the image shake speed. That is, in step 403, a process of determining whether or not the image shake speed obtained from the output of the gyro sensor exceeds the predetermined maximum drive speed of the correction lens 28 is performed. If the image blur speed is the correction lens 2
If the maximum driving speed of 8 is exceeded, step 404
Then, the process proceeds to step 408 where the excessive speed flag is set to "1".

On the other hand, if the image blur speed does not exceed the maximum driving speed of the correction lens 28, the routine proceeds to step 405, where it is judged whether or not "1" is set in the excessive speed flag. If "1" is set in the excessive speed flag in step 405, the position information stored in the correction optical system position register 222 in step 406 is copied to the integration register 221. Then, step 407
The excessive speed flag is initialized by and the process proceeds to step 408. If "1" is not set in the overspeed flag in step 405, the process of step 406 is not performed,
Proceeding to step 407, the excessive speed flag is initialized and proceeding to step 408.

From the state in which the excessive speed flag is set to "1", that is, the image blur speed exceeds the maximum driving speed of the correction lens 28, the image blur speed is corrected.
When the driving speed of the drive speed is lower than the maximum speed, the position information of the correction optical system position register 222 is copied to the integration register 221.

In step 408, the integration register 221
The difference between the shake angle information of the monoculars stored in and the position information of the correction lens 28 stored in the correction optical system position register 222 is calculated, multiplied by an appropriate magnification, and output from the DA conversion output terminal DA1. It returns to step 304 of the flowchart of 3.

As described above, the state in which the image blur speed continues to exceed the maximum drive speed of the correction lens 28, or conversely, the image blur speed continues to fall below the maximum drive speed of the correction lens 28. In, the first actuator 131 is driven in order to compare the actual deflection angle information of the optical axis of the monocular and the position of the correction lens 28 and eliminate the difference. However, when the speed of the image blur shifts from a state where the maximum speed of driving the correction lens 28 is higher than a lower speed to a state where the speed is lower, the positional information of the correction lens 28 is copied to the deflection angle information of the optical axis of the monocular, and the correction is performed. Arithmetic processing for driving the lens 28 is performed. As a result, the correction lens 28 is forcibly stopped at the current position, and the stopped position is maintained until the next interrupt process occurs. further,
When the value of the integration register 221 is changed by the next interruption process and the difference value between the position information of the correction lens 28 and the shake angle information of the optical axis of the monocular is not 0, the normal correction is performed from the position where it is forcibly stopped. Control is performed.

Returning from the interruption processing to the image blur correction processing of FIG. 3, the operation proceeds from step 304 to step 305, and when the interruption non-permission mode is set, in step 306, the input signal of the second AD conversion input terminal AD2, that is, The position information of the correction lens 28 is digitally converted to CP.
It is read by U200. Next, in step 307, the second AD conversion input terminal AD2 that has been digitally converted
The input signal of is appropriately multiplied and inverted, and then output from the DA conversion output terminal DA1 to the lateral power amplifier 206.
The actuator 131 is driven. Since the signal for driving the first actuator 131 is the inversion of the input signal of the second AD conversion input terminal AD2, the correction lens 28 is driven in the direction in which its optical axis matches the optical axis of the monocular. It

In step 308, it is determined whether or not the optical axis of the correction lens 28 is in the reference position. If it is in the reference position, the process proceeds to step 309, the driving of the correction lens 28 is stopped, and the process returns to step 301. If the optical axis of the correction lens 28 is not at the reference position, the process returns to step 306. That is, in steps 306 to 308, processing for returning the correction lens 28 to the reference position is performed.

FIG. 5 shows a correction lens 2 and the shake angle of the optical axis of the monocular when the above-described image shake correction in the lateral direction is performed.
8 position change, image shake speed and correction lens 28
5 is a graph showing the difference in the moving speed of the. In FIG. 5, a solid line a is a waveform showing a change in the data of the integration register 221 of the CPU 200 that integrates the angular velocity of the optical axis of the monocular output from the lateral gyro sensor 202. That is,
It is a waveform showing the amount of change of the deflection angle information of the optical axis of the monocular. Hereinafter, this is referred to as an image shake waveform. The broken line b is a movement waveform indicating the amount of change in the position of the correction lens 28. A solid line c is a waveform showing a change in the difference obtained by subtracting the moving speed of the correction lens 28 from the image shake speed.

After the driving of the correction lens 28 is started at the time t0, the change amount of the deflection angle information of the optical axis of the monocular and the change amount of the position of the correction lens 28 are substantially the same until the time t1. That is, the speed of driving the correction lens 28 follows the speed of image blur, and the difference between them is zero.

From time t1 to time t2, the speed of image blur gradually increases and exceeds the maximum speed of driving the correction lens 28. After time t2, the change amount of the position of the correction lens 28 reaches the maximum value although the change amount of the position of the monocular increases gradually as indicated by the solid line a, and therefore the waveform of the broken line b is constant. The amount of change is shown. Since the image blur speed continues to increase beyond the maximum speed of driving the correction lens 28, the waveform indicating the difference between the two speeds shifts in the negative direction.

From the time t2 to the time t3, the image shake speed starts to decrease, and at the time t3, it falls below the maximum driving speed of the correction lens 28, and the correction lens 2 becomes the image shake speed.
The drive speed of 8 can be followed. That is, the difference between the two speeds is zero again. At this point, the position information of the correction lens 28 is copied to the integration register 221 that stores the shake angle information of the monocular as described above. Therefore, as shown in FIG. 5, at the time t3, the solid line a
The value of corresponds to the value of the broken line b. After time t3, the speed of image blur is below the maximum speed of driving the correction lens 28, and the state where the difference between the two speeds is zero continues.

As described above, according to the present embodiment, when the lateral image blur speed exceeds the maximum driving speed of the correction lens 28 and then decelerates and falls below the maximum driving speed of the correction lens 28. Then, the position information of the correction lens 28 is copied to the shake angle information of the monocular. That is, the difference value between the position information of the correction lens 28 and the shake angle information of the monocular is replaced with 0. As a result, the correction lens 28 is not driven anymore, and is instantaneously stopped at the position at the time when the difference value is replaced with zero. The correction lens 28 forcibly stopped in this way remains stopped at the stop position until the value of the integration register 221 changes and the difference value is not zero. After that, when the interrupt control is applied and the difference value is not 0, the correction control is restarted. Therefore, it is possible to prevent the correction lens 28 from being continuously driven at the maximum speed even when the image shake speed is reduced.
In the vertical direction, the same gyro sensor as in the horizontal direction,
Position information acquisition means and the like are connected to the CPU 200,
Similar correction control is performed.

FIG. 6 is a flowchart showing a correction control processing procedure in the second embodiment of the present invention, and FIG. 7 is a flowchart showing an interrupt processing in the correction control of the second embodiment. The configuration of the optical instrument of the second embodiment is similar to that of the monocular of the first embodiment. Further, terms such as the integration register 221 and the correction optical system position register 222 used in the flowcharts of FIGS. 6 and 7 have the same meaning as in the first embodiment.

When the power of the monocular body is turned on and the program starts executing, in step 601, the switch 201 is operated.
It is determined whether or not is pressed. If it is pressed, the process proceeds to step 602, and if it is not pressed, no new process is performed. In step 602, the variable N indicating the number of interrupts and the integration register 221 are initialized, and then in step 603, the interrupt permission mode is set.

In step 604, it is judged whether or not the switch 201 is pressed, and if it is not pressed, the routine proceeds to step 605, where the interrupt non-permission mode is set. On the other hand, if the switch 601 is pressed, new processing is not performed while the interrupt permission mode is set. That is, when the interrupt permission mode is set, the interrupt permission mode is always maintained while the switch 201 is kept pressed.

When the program shown in FIG. 7 is started and interrupt processing is performed, in step 701, the input signal of the first AD conversion input terminal AD1, that is, the angular velocity of the optical axis of the monocular output from the lateral gyro sensor 202. The signal obtained by power amplification of is converted into a digital signal, and the integration register 221
And the shake angle information of the monocular is stored.
In step 702, the second AD conversion input terminal A
The input signal of D2, that is, the position information of the correction lens 28 output from the first one-dimensional PSD 204 is digitally converted and stored in the correction optical system position register 222.

In step 703, the variable N is incremented by 1, and then in step 704, it is determined whether or not the value of the variable N has reached 10. If the value of the variable N has not reached 10, the process proceeds to step 707.

On the other hand, when the value of the variable N has reached 10, the process proceeds to step 705. In step 705,
The position information of the correction lens 28 stored in the correction optical system position register 222 is copied to the integration register 221, then the process proceeds to step 706, the value of the variable N is cleared, and the process proceeds to step 707.

In step 707, the integration register 221
The difference between the shake angle information of the monoculars stored in and the position information of the correction lens 28 stored in the correction optical system position register 222 is calculated, multiplied by an appropriate magnification, and output from the DA conversion output terminal DA1. Returning to step 604 of the flowchart of FIG.

As described above, in the present embodiment, the data of the correction optical system position register 222 is always displayed at a predetermined interval regardless of whether the speed of image blur exceeds the maximum speed of driving the correction lens 28. The data is copied to the integration register 221, and arithmetic processing for driving the correction lens 28 is performed.

The processing after step 605 after returning from the interruption processing to the image blur correction processing of FIG. 7 is the same as the processing of step 306 to step 309 of the flow chart of the correction control of the first embodiment shown in FIG. Is.

FIG. 8 is a graph showing changes in the optical axis of the monocular and the position of the correction lens 28 during driving of the correction lens 28 process of this embodiment. A solid line a and a broken line b in FIG.
The solid line c is the same as in FIG.

From the time t13 to the time t14, and from the time t14 to the time t15, the speed of the image blur exceeds the maximum speed of driving the correction lens 28, and at the time t14 and the time t15, the correction optical system position register 222 is reached. Data is copied to the integration register 221. Also, from time t10 to time t13 and time t1
From 5 to time t21, the image blur speed is lower than the maximum driving speed of the correction lens 28, but the data of the correction optical system position register 222 is always integrated at a predetermined interval as at the time t14 and the time t15. It is copied to the register 221.

As described above, according to the present embodiment, it is not necessary to judge whether or not the speed of image blur exceeds the maximum speed of driving the correction lens 28, and therefore the processing is simplified.

In the second embodiment, as shown in FIG.
When the value of the variable N reaches 10, the process proceeds to step 705 to perform the copy process, but it is not limited to this. The condition determination in step 704 may be made based on whether or not the value of the variable N is 1, and the copy process may be performed every time the interrupt process is performed. That is, the interval of the copy processing may be matched with the interval of AD conversion in the first and second AD conversion terminals AD1 and AD2.

FIG. 9 is a perspective view showing an image blur correction mechanism for a monocular or a camera lens to which the third embodiment of the present invention is applied. The first direct acting actuator 231 has a motor case 231a and a shaft 231b. A stepping motor (not shown) is arranged in the motor case 231a. The shaft 231b moves back and forth according to the forward and reverse rotation of the stepping motor. Similarly, the second direct-acting actuator 232 has a motor case 232a and a shaft 232b, and a stepping motor (not shown) is arranged in the motor case 232a. The shaft 232b moves back and forth. The other configurations are the same as those of the first embodiment, and the same members are designated by the same reference numerals.

FIG. 10 is a diagram showing a circuit configuration for performing lateral image blur correction in the image blur correction control circuit of the monocular according to the third embodiment. The same components as those of the circuit configuration of the first embodiment shown in FIG. 2 are designated by the same reference numerals. CP
In U200, predetermined processing such as integration calculation is performed based on the digital value converted by the AD conversion input terminal AD1, and a 2-bit control signal is output from the output ports PO0 and PO1. A lateral drive circuit 214 is connected to the output ports PO0 and PO1. Lateral drive circuit 214
Then, based on a 2-bit control signal input from the CPU 200, a drive signal for the stepping motor of the first linear actuator 231 is generated and output. Further, the position of the correction lens 28 is calculated by multiplying the cumulative number of steps of the stepping motor by the driving amount of the lens support frame 25 corresponding to one step rotation of the stepping motor, and is stored in the correction optical system position register 222.

Although not shown in FIG. 10, a CPU
A vertical gyro sensor for correcting image blur in the vertical direction, a vertical amplifier, and a vertical drive circuit are connected to the device 200. Similarly to the case where the first linear motion type actuator 231 is connected to the lateral direction drive circuit 214, the second linear motion type actuator 232 is connected to the vertical direction drive circuit and is output from the vertical direction drive circuit. The stepping motor of the second direct-acting actuator 232 is driven based on the drive signal to correct the image blur in the vertical direction.

FIG. 11 is a flow chart showing the correction control processing procedure in the third embodiment, and FIG. 12 is a flow chart showing the interrupt processing in the correction control of the third embodiment. 11, steps 801 to 805 correspond to steps 301 to 30 of the flowchart shown in FIG.
The same processing as that up to 5 is performed. When the interrupt enable mode is set in step 803, the interrupt enable mode is maintained while the switch 201 is held pressed. During the interrupt permission mode, the program shown in FIG. 12 is activated and interrupt processing is performed.

In step 901 of FIG. 12, as in step 401 of the flowchart of FIG. 4, the input signal of the first AD conversion input terminal AD1 is digitally converted and added in the integration register 221, and the shake angle information of the monocular is integrated. It is stored in the register 221. Also, step 902
Then, the current position of the correction lens 28 is calculated by multiplying the driving amount of the lens support frame 25 corresponding to one step rotation of the stepping motor by the cumulative number of steps of the stepping motor up to the current time, and the correction optical system position register 222 is calculated. Stored in.

The processing from step 903 to step 905 is the same as the processing from step 403 to 405 in FIG. If "1" is set in the overspeed flag in step 905, step 906
Then, the process proceeds to and the predetermined value β is added to or subtracted from the value of the correction optical system position register 222. The predetermined value β is set to be larger than a predetermined threshold value that is a reference for determining whether or not to step-drive the stepping motor. The addition or subtraction of the predetermined value β is performed in consideration of the driving direction of the correction lens 28. That is, for example, if the rightward drive is positive and the leftward drive is negative, a predetermined value β is added when the correction lens 28 is driven to the right, and when the correction lens 28 is driven to the left. The predetermined value β is subtracted.

Next, in step 907, the position information obtained by adding or subtracting the predetermined value β is copied to the integration register 221. In step 908, the excessive speed flag is initialized, and the flow advances to step 909. In step 909, the difference between the shake angle information of the monoculars stored in the integration register 221 and the position information of the correction lens 28 stored in the correction optical system position register 222 is calculated in step 909, and the difference is offset. The number of drive steps of the stepping motor is calculated so that the corresponding control signals are output from the output ports PO0 and PO1.

After returning from the interruption processing to the image blur correction processing of FIG. 11, the process proceeds from step 804 to step 805, and when the interruption non-permission mode is set, at step 806, the correction lens is corrected based on the cumulative driving step number of the stepping motor. Processing for returning 28 to the reference position is performed. Then, in step 807, the output port PO
The values of 0 and PO1 are set to "0", the driving of the correction lens 28 is stopped, and the process returns to step 801.

As described above, in the third embodiment, the data in the correction optical system position register 222 is added or subtracted by the predetermined value β which is larger than the threshold value which is the criterion for determining whether or not to perform the one-step driving. It is copied to the integration register 221. Therefore, it is possible to prevent the phenomenon in which the data in both registers are different from each other and the input voltage to the actuator is temporarily lowered, and the drive control of the correction lens 28 is smoothly performed.

[0071]

As described above, according to the present invention, stable correction control is performed even if the speed of image blur exceeds the maximum speed of driving the correction optical system.

[Brief description of drawings]

FIG. 1 is a perspective view of a correction control mechanism to which a first embodiment of the present invention is applied.

FIG. 2 is a block diagram of the first embodiment.

FIG. 3 is a flowchart of image blur correction control according to the first embodiment.

FIG. 4 is a flowchart of interrupt processing in the image blur correction control according to the first embodiment.

FIG. 5 is a graph showing the amount of change in the position of the monocular and the position of the correction lens in the image blur correction control of the first embodiment.

FIG. 6 is a flowchart of image blur correction control according to the second embodiment of the present invention.

FIG. 7 is a flowchart of interrupt processing in image blur correction control according to the second embodiment.

FIG. 8 is a graph showing the amount of change in the position of the monocular and the position of the correction lens in the image blur correction control of the second embodiment.

FIG. 9 is a perspective view of a correction control mechanism to which a third embodiment of the present invention is applied.

FIG. 10 is a block diagram of a third embodiment.

FIG. 11 is a flowchart of image blur correction control according to the third embodiment.

FIG. 12 is a flowchart of interrupt processing in image blur correction control according to the third embodiment.

[Explanation of symbols]

25 lens support frame 28 Correction lens 131, 231 First direct acting actuator 132,232 Second direct-acting actuator 200 CPU 201 switch 202 Lateral gyro sensor 204 First one-dimensional PSD 205 transmitter 207 Second one-dimensional LED 208 First slit 209 Second one-dimensional PSD 210 Second LED 211 Second slit

Continuation of front page (56) Reference JP-A-4-39616 (JP, A) JP-A-9-80556 (JP, A) JP-A-9-80506 (JP, A) JP-A-4-34526 (JP , A) JP 7-294990 (JP, A) JP 1-131521 (JP, A) JP 6-130476 (JP, A) JP 6-245136 (JP, A) JP 11-249187 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 5/00 H04N 5/222-5/257 G02B 23/00

Claims (7)

(57) [Claims] 1. An optical axis shake angular velocity detecting means of an optical instrument, an integrating means for integrating an output of the angular velocity detecting means to convert the optical axis shake angle information, and a correction for correcting a shake of an observation image. An optical system, position information acquisition means of the correction optical system, and a difference between the deflection angle information of the optical axis output by the integration means and the position information of the correction optical system output by the position information acquisition means is eliminated. Control means for driving the correction optical system so that the speed of deflection of the optical axis is adjusted by the correction optical system.
From the value exceeding the maximum speed of driving the system to lower than the maximum speed
An image blur correction control device, comprising: a replacement unit that replaces the output value of the integration unit with a value that is substantially equal to the output value of the position information acquisition unit when the output value of the integration unit changes . 2. An angular velocity detecting means for deflection of an optical axis of an optical instrument.
And the output of the angular velocity detecting means is integrated to shake the optical axis.
Compensation for blurring of the observed image and the integration means to convert the angle information
Correction optical system and position information acquisition means of the correction optical system
And the deflection angle information of the optical axis output by the integrating means,
Position of the correction optical system output by the position information acquisition means
Driving the correction optical system so that the difference from the information is eliminated
Control means for controlling, and after starting the driving of the correction optical system, a predetermined
Whenever time elapses, the output value of the integrating means is set to the position
A replacement procedure to replace the output value of the information acquisition means with a value approximately equal to
An image blur correction control device having a step. 3. The replacing means maintains the driving direction of the correction optical system up to that point at the time of replacing the output value of the integrating means with a value substantially equal to the output value of the position information acquiring means. 3. The image blur correction control device according to claim 1, wherein a predetermined value is added to or subtracted from the output value of the position information acquisition means to replace it with the output value of the integration means. 4. When the driving direction is the first direction,
Adding the predetermined value to the output value of the position information acquisition means,
The image shake according to claim 3 , wherein when the driving direction is a second direction which is 180 degrees opposite to the first direction, the predetermined value is subtracted from the output value of the position information acquisition unit. Correction control device. 5. The correction optical system is driven by a step by a predetermined amount by the control means, and the predetermined value is set to be larger than a threshold value serving as a reference for whether or not to step drive the correction optical system. The image blur correction control device according to claim 4 , wherein the image blur correction control device is provided. 6. A first step of detecting an angular velocity of a deflection of an optical axis of an optical instrument, a second step of integrating the angular velocity and converting it into deflection angle information of the optical axis, and correcting a deviation of an observed image. A third step of detecting the position of the correction optical system,
A fourth step of correcting the image blur by driving the correction optical system so as to eliminate the difference between the shake angle information of the optical axis and the position information of the correction optical system, and in the fourth step, The speed of deflection of the optical axis of the correction optical system is
Values exceeding the maximum speed of driving to values lower than the maximum speed
The image blur correction control method is characterized in that the shake angle information of the optical axis is replaced with the position information of the correction optical system when the change occurs to. 7. An angular velocity of deflection of an optical axis of an optical instrument is detected.
The first step, and the angular velocity is integrated to shake the optical axis.
The deviation of the observed image from the second step of converting into the angle information
A third step of detecting the position of the correction optical system for correction,
Deflection angle information of the optical axis and position information of the correction optical system
The correction optical system is driven so that the difference between
A fourth step for correcting shake, and the fourth step
In this case, the light
Replace the deflection angle information of the axis with the position information of the correction optical system.
A method for controlling image blur correction, which comprises: