JPH07261233A - Shake correcting camera - Google Patents

Abstract

PURPOSE:To detect the position of the optical axis changing part of a correcting lens, etc., and to reduce a processing load for a displacement calculation, etc., by providing a displacement calculating part directly calculating the displacement of the optical path changing part based on the count value of a multiplier counter. CONSTITUTION:At the time of each rising and falling of the inputted signals of two phases, a 4-multiplier counter 1-13 uses a phase of other phase to multiply its count value by +1 or-1. Therefore, only the A-and B-phases of an interrupter signal are inputted to the 4-multiplier counter 1-13 to make its count value a value corresponding to a correcting lens position LR. Moreover, counting up and down are not required because of software processing and the count value of the counter 1-13 is only read to detect the position of the correcting lens 8. Its speed can be calculated only by obtaining a variation in the count value of the counter 1-13 at a space of 1ms for a specified time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image stabilization camera having an image stabilization function.

[0002]

2. Description of the Related Art Conventionally, this type of camera-shake correction camera detects camera-shake generated in a camera by an angular velocity detection circuit using an angular velocity sensor, etc., and changes the optical axis of a photographing optical system based on the detected amount. It has been proposed to suppress the camera shake by making it.

FIG. 2 is a block diagram showing an example of a conventional camera shake correction camera. In order to perform camera shake correction, the camera must be configured to detect angular velocities due to camera shake in at least two directions and change the optical axis in each of the detected angular velocities. However,
Here, since the control is performed by a similar method, a one-way image stabilization method will be described.

The camera-shake correcting camera as described above is provided with a camera-shake correcting lens 8 which constitutes a part of the photographing lenses 6, 7, 8 and 9.
It has been proposed to suppress camera shake by shifting (may be simply referred to as a correction lens hereinafter) so as to cancel the shake according to the detected camera shake signal (angular velocity).

The angular velocity detection circuit 5 is for detecting the angular velocity due to camera shake, and an angular velocity sensor or the like can be used. The angular velocity detection circuit 5 is a circuit whose output value changes according to a change in the angular velocity, and is configured to be able to detect the angular velocity due to camera shake moment by moment. The output of the angular velocity detection circuit 5 is connected to a one-chip microcomputer (abbreviated as CPU) 1.

The CPU 1 has a built-in ROM that stores a program that controls the processing of the CPU 1 and a RAM that temporarily stores data. In addition to this, the CPU 1 also calculates an A / D converter 1-1, an interval timer 1-3, an edge interval measurement timer 1-5, a position and a speed of the correction lens 8, and a speed direction thereof. The speed / position calculation unit 1-4 and the A / D converter 1-1's A /
The target speed (absolute value and direction) and position of the correction lens 8 are calculated from the D conversion value, and the motor 4 is calculated based on the target speed of the correction lens 8 and the actual speed of the correction lens 8.
It has a function of a motor control processing unit 1-2 for controlling the.

The A / D converter 1-1 includes an angular velocity detection circuit 5
Output for A / D conversion at a predetermined time interval, and the output is connected to the motor control processing unit 1-2. The motor control processing unit 1-2 is a unit that calculates a correction lens target speed that determines what speed the correction lens 8 should be shifted to suppress camera shake, and its output is connected to the motor drive circuit 2. There is. The motor drive circuit 2 is a circuit that controls the rotation speed of the motor 4 according to the corrected lens target speed calculated by the motor control processing unit 1-2. The rotation of the motor 4 is decelerated by a gear or the like, and the rotational movement of the gear is converted into a linear movement and then transmitted to the correction lens 8 to shift the correction lens 8.

The position detecting interrupter 3 is for detecting the position of the correction lens 8, and its output signal is connected to the lens speed / position calculating section 1-4 in the CPU 1. The lens speed / position calculation unit 1-4 is for calculating the position and movement speed of the correction lens 8 and the direction of the speed, and its output is the motor control processing unit 1.
-2 is connected. The motor control processing unit 1-2 controls the speed of the correction lens 8 by negatively feeding back the rotation speed of the motor 4 based on the output of the lens speed / position calculation unit 1-4.

The operation procedure of the conventional camera shake correction camera as described above is as follows. First, the correction lens 8 is driven to a substantially central position within the shift range so that the photographing optical axis is located at a predetermined central position (hereinafter referred to as centering operation).
To do. After that, immediately before the exposure process of operating the shutter to expose the film, the control of the correction lens 8 (hereinafter, referred to as image stabilization control) is started so as to cancel the camera shake according to the output of the angular velocity detection circuit 5. The image stabilization control ends when the exposure processing ends, and thereafter, the camera shake correction lens is driven to a predetermined reference position (hereinafter, referred to as reset position) (hereinafter, referred to as reset operation).

Next, focusing on the operation of the CPU 1, the operation procedure of the image stabilizing camera will be described. First, the detection of angular velocity due to camera shake will be described. When the angular velocity detection circuit 5 detects the angular velocity due to camera shake, the signal is input to the A / D converter 1-1 incorporated in the CPU 1. The A / D converter 1-1 includes an interval timer 1
-Predetermined time interval from -3 (for example, an interval of about 1 ms)
The angular velocity signal can be
/ D conversion, and output to the motor control processing unit 1-2.

The motor control processing section 1-2 continues to calculate the target speed VC of the correction lens 8 from the A / D converted value, for example, as shown in equation (1). VC = K0 × (A / D converted value) (1) However, the coefficient K0 is a coefficient at which the camera shake correction can be properly performed by shifting the correction lens 8 with respect to the A / D converted value. The value is the photographic optical system (6, 7,
8, 9), the angular velocity detection circuit 5, the A / D converter 1-1, and the like. It should be noted that this target speed VC will be described using the same unit as the unit of the actual speed VR of the correction lens 8.

Next, a method of detecting the position, speed and moving direction of the correction lens 8 will be described. Here, an example using a transmissive encoder will be described. The position detection interrupter 3 has one of gears that converts the rotation of the motor 4 into a linear motion, and is provided with a disk having a plurality of holes, and the disk has two pairs of interrupters whose detection output is about 90 °. The structure is such that the interrupters are arranged at positions where there is a phase difference, and the holes in the disk are detected by each interrupter.

FIG. 4 is a diagram showing a method of calculating the position and speed of the correction lens in the conventional example. Phase A and B of FIG.
The phase is the output of two pairs of interrupters.
As for the phases, outputs of 90 ° different phases are obtained by the rotation of the motor 4. The absolute value of the speed of the correction lens 8 is the A phase,
It can be detected by the cycle of either output of the B phase. Further, the moving direction of the correction lens 8 is such that at the falling edge or rising edge of one of the outputs of the A phase and the B phase, the other output is at the High level, or at the L level.
It can be detected depending on whether it is at the ow level. The position LR of the correction lens 8 can be detected by counting up or down at the moving direction and the output edge of either the A phase or the B phase. The correction lens position LR is a centering operation for driving the correction lens 8 to a substantially central position of its shift range,
Alternatively, it is used in a reset operation for driving the correction lens 8 to the reset position. The detection of the speed, the moving direction, and the position of the correction lens 8 described above is performed by the lens speed / position calculating unit 1-4 in the CPU 1 based on the outputs of the A phase and B phase of the position detecting interrupter 3.

Next, an example of a method for detecting the position, speed and moving direction of the correction lens 8 will be described with reference to FIG. First, the CPU 1 sets A at timing t10.
The falling edge of the phase is detected, and the phase of the B phase at that time is read. In the case of FIG. 4, since the B phase is Low, the value of the correction lens position LR is incremented by 1 count. Next, at timing t11, the fall of the A phase is detected, and the phase of the B phase at that time is read. In the case of FIG. 4, since the B phase is Low, the value of the correction lens position LR is set to 1 this time as well.
Add count. By repeating such processing, the correction lens position LR is detected in real time.

The correction lens speed VR is calculated by calculating the absolute value of the correction lens speed VR and determining the sign of VR. The absolute value of the correction lens speed VR is determined by the edge interval measurement timer 1-5 by the fall timing t of the A phase.
Time T from 10 to the next falling timing t11
It is calculated by measuring 1 and taking the reciprocal thereof. The sign of the correction lens speed VR is determined as + when the phase of the B phase at the timing t11 is Low, and is determined as − when it is High. This can be shown by the following equations (2) and (3). The corrected lens speed VR is detected in real time by repeating the same operation after t12.

VR = a × {(1 cycle of A phase)} (2) a = + 1; When B phase is Low at the fall of A phase −1: B phase at the fall of A phase Is High (3)

Next, the control method of the motor 4 will be described with reference to FIG.
Will be explained. As shown in FIG. 6, the motor control processing unit 1-2 calculates the target speed VC of the correction lens 8 based on the output of the angular velocity detection circuit 5, and then calculates the target speed VC.
And the actual corrected lens speed VR at that time, the motor 4 is controlled as follows.

When VC ≧ 0; When VR <VC; The motor 4 is energized in the forward direction. When VR ≧ VC: The motor 4 is put in the idling state or the short brake state. When VC <0; When VR>VC; Energize the motor 4 in the reverse rotation direction. When VR ≦ VC: The motor 4 is put in the idling state or the short brake state.

First, the motor control processing unit 1-2, when VC is 0 or positive and VR <VC, that is,
When the actual speed is lower than the target speed, the motor 4 is energized in the forward rotation direction through the motor drive circuit 2, and conversely, when VR ≧ VC, that is, the target speed. If the actual speed is greater than or equal to
The motor 4 is put in the idling state or the short brake state through the motor drive circuit 2.

When VC is negative and VR> VC, the motor control processor 1-2 energizes the motor 4 in the reverse direction through the motor drive circuit 2 and vice versa.
When VR ≦ VC, the motor 4 is put in the idling state or the short brake state through the motor drive circuit 2.

Here, the control when the VC is positive will be described with reference to FIG. From timing ti to tj, since VR <VC, the motor 4 is energized in the forward rotation direction. Since VR ≧ VC during the timing tj to tl, the motor 4 is in the idling or short brake state. The motor control processing unit 1-2 receives the timing t.
The same control is performed after l.

[0022]

However, the conventional camera shake correction camera described above has the following problems. First, in order to calculate the correction lens position LR and the correction lens speed VR, the first problem is that the rising or falling of the A phase or B phase of the interrupter signal must be detected in real time. Further, the CPU 1 must simultaneously perform other processing, for example, control of the shutter and the like while performing the camera shake correction. Therefore, the CPU 1 activates the interrupt processing at the rising or falling of the A phase or the B phase, and the above-mentioned V
In many cases, R and LR detection processing is performed. But,
When calculating the VR, when the CPU 1 calculates the reciprocal of the cycle as shown in the equation (2), a large processing time is required to ensure the calculation accuracy and to perform the calculation. It takes. This calculation may be a considerable load in a one-chip microcomputer used in a normal camera.

Further, in order to improve the controllability of the camera shake correction, it is necessary to control the target stop position with high accuracy in the centering operation and the reset operation.
For that purpose, the correction lens speed VR, the correction lens position L
It is essential to improve the detection accuracy of R and its real-time property. However, since the corrected lens speed VR is calculated only after the next rising or falling is detected from the first rising or falling of the interrupter signal, the speed in the meantime cannot be detected.
Therefore, when the correction lens 8 is shifted to a low speed, the interval for calculating the correction lens speed VR may be very long. In order to solve this problem, the speed may be calculated by the same method at both the rising and falling edges of the A phase or the rising or falling edge of the B phase. But in this case, CP
There arises a problem that the number of processes that U1 is caused to perform increases.

The same applies to the correction lens position LR. In the above description, one count unit is used for each falling edge of the A phase, but the counting operation is performed at the rising edge of the A phase, and the counting operation is performed at the rising edge or the falling edge of the B phase. For example, the correction lens position LR can improve the resolution. However, also in this case, there is a problem that the number of processes to be performed by the CPU 1 increases.

As a second problem, the conventional motor control method is to energize the motor in controlling the motor 4,
Since it is performed depending on whether the correction lens 8 is performed or not, smooth control of the correction lens 8 cannot be performed. Further, when the motor 4 is controlled at a low speed, the correction lens 8 is applied to the motor 4 in order to repeat energization, idling or short brake.
Works awkwardly. By this,
It was difficult to improve the image stabilization performance.

An object of the present invention is to solve the above-mentioned problems, to reduce the calculation processing of the position and speed of the correction lens forming the optical axis changing portion, and to enable the drive control of the correction lens with high accuracy. It is to provide an image stabilization camera.

[0027]

In order to solve the above-mentioned problems, a first means for solving the problems of the camera-shake correction camera according to the present invention is an optical axis changing section for changing a photographing optical axis, and the optical axis changing section. In a camera shake correction camera including an optical axis change drive unit for driving the optical axis change unit and a displacement signal detection unit for detecting a displacement of the optical axis change unit and outputting the displacement signal as a two-phase interrupter signal, A double or quadruple multiplication counter whose count value increases or decreases based on the phase difference between the two-phase interrupter signals at the rising and falling edges of at least one of the two-phase interrupter signals, And a displacement calculation unit that directly calculates the displacement of the optical axis changing unit based on the count value of the multiplication counter.

A second solving means is, in the image stabilizing camera of the first solving means, a PWM timer which outputs a signal for changing a ratio of a high level signal width during a predetermined time based on an output of the multiplication counter. And controlling the optical axis change drive unit by the output of the PWM timer.

A third solving means is the image stabilizing camera of the second solving means, comprising an interval timer for activating interrupt processing at a predetermined time interval, and the optical axis changing portion is displaced by the count value of the multiplication counter. Is detected and the speed of displacement of the optical axis changing unit is determined by the count value of the previous multiplication counter and the current count value of the multiplication counter based on the interrupt processing activated by the interval timer. To calculate the PW
The optical axis change drive unit is controlled by the output of the M timer.

[0030]

In the present invention, the position of the optical axis changing portion such as the correction lens can be detected by referring to the counter value of the multiplication counter, and the load of processing such as displacement calculation can be reduced. Specifically, the one-chip microcomputer has a built-in multiplication counter such as a multiplication by 4 whose count value increases or decreases depending on the phase difference between the two-phase interrupter signals when the two-phase interrupter signals rise and fall, The position of the correction lens or the like is detected by the count value of the multiplication counter.

By setting a desired value in the PWM timer, it becomes possible to drive the optical axis changing drive unit such as a motor. Specifically, the one-chip microcomputer has a built-in PWM timer that outputs a signal whose ratio of the high width during a predetermined time changes according to the input of the multiplication counter, and controls the motor etc. by the output of the PWM timer. To do.

Further, based on the interrupt processing activated by the interval timer, the difference between the count value of the previous multiplication counter and the current count value of the multiplication counter is calculated to obtain the light of the correction lens or the like. It has become possible to calculate the speed of the axis change part. Specifically, the one-chip microcomputer has a built-in interval timer that activates interrupt processing at predetermined time intervals, and the interrupt processing activated by the interval timer is based on the count value of the previous multiplication counter and the current value. The speed of the correction lens or the like is calculated based on the count value of the multiplication counter.

[0033]

Embodiments will be described in more detail below with reference to the drawings and the like. FIG. 1 is a circuit diagram schematically showing an embodiment of an image stabilization camera according to the present invention. It should be noted that parts having the same functions as those in the circuit diagram (FIG. 2) of the conventional example described above are denoted by the same reference numerals, and redundant description will be appropriately omitted. The main difference from the conventional technology is the CPU
1 is an internal function and its program processing part.

The CPU 1 of this embodiment is the A / D converter 1
-11, an interval timer 1-12, a quadruple counter 1-13, an interval timer interrupt processing unit 1-14 repeatedly activated by the interval timer 1-12 at a predetermined time interval, for example, 1 ms interval, and PWM.
It has functions such as a timer 1-15.

Further, the PWM timer 1-15 is a timer capable of arbitrarily changing the ratio of High and Low of its output during a predetermined time, and this PWM timer 1-15
15 is set by setting an arbitrary drive duty,
By controlling the energization time of the motor 4 during a predetermined time, it is possible to perform finer speed control of the correction lens 8. In addition, this kind of control is controlled by PWM (PULSE WIDTH MODULATIO
N) Say control.

First, a method of detecting the position and speed of the correction lens 8 and its direction in the present invention will be described.
The difference between this embodiment and the conventional example is that the A-phase and B-phase signals of the position detecting interrupter 3 are input to the quadruple multiplication counter 1-13 which is a built-in function of the CPU 1. Next, the function of the quadruple counter will be described with reference to FIG. FIG. 3 is a diagram showing the operation of the quadruple counter and the method of calculating the position and speed of the correction lens according to this embodiment.
The quadruple counter 1-13 increments or decrements the count value by +1 or -1 depending on the phase of the other phase at each rising and falling of the input two-phase signal.

For example, there is one that performs the following counting method. At the rising of the A phase; when the B phase is High, the count value is incremented by one. When the B phase is Low, the count value is -1
To do. At the fall of the A phase; when the B phase is Low, the count value is incremented by one. If the B phase is High, set the count value to -1.
To do. When the B phase rises; the count value is incremented by 1 when the A phase is Low. If the A phase is High, set the count value to -1.
To do. When the B phase falls: When the A phase is High, the count value is incremented by one. If the A phase is Low, set the count value to -1
To do.

Therefore, only by inputting the A phase and the B phase of the interrupter signal to the quadruple multiplication counter 1-13, the count value becomes a value corresponding to the correction lens position LR. Further, the count value performs such counting operation at all rising and falling edges of the A phase and the B phase. For this reason, in the conventional example, the resolution is 1 count for one cycle of the interrupter signal, whereas in this embodiment, it is possible to easily obtain four times the resolution.

Further, unlike the conventional example, it is not necessary to count up and down by software processing, and the position of the correction lens 8 can be detected by simply reading the count value of the quadruple multiplication counter 1-13. It will be possible.

Next, a method of calculating the speed of the correction lens 8 will be described. The speed of the correction lens 8 is set to a predetermined time, for example, 1 m.
It can be calculated by simply obtaining the amount of change in the count value of the quadruple counter 1-13 between s. Here, 1ms
A case of obtaining the change amount of the count value between will be described with an example of FIG. Since the amount of change in the count value between the timing t1 and the timing t2 is +8, the correction lens speed VR = + 8 / ms. Similarly, since the amount of change in the count value between the timing t2 and the timing t3 is -2, the correction lens speed VR = -2 / ms.

As described above, the calculation is very simple as compared with the calculation method using the formula (2) according to the conventional example. In addition, it is not necessary to detect the sign of the correction lens speed speed from the phase of the other phase. In this way, the program processing required to calculate the speed VR and the position LR of the correction lens 8 is greatly reduced.

Next, the process of controlling the motor 4 according to this embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing the flow of the interval timer interrupt processing in this embodiment. FIG. 7 shows an excerpt of a part related to the present embodiment from the program processing built in the CPU 1. In S100, the interval timer interrupt process that starts repeatedly is started at a predetermined time interval (here, 1 ms interval) from the interval timer 1-12 built in the CPU 1 of FIG. First, S10
1, the output of the angular velocity detection circuit 5 is A / D converted,
The corrected lens target velocity VC is calculated from the A / D converted value by a method such as Expression (1).

Next, in S102, the quadruple multiplication counter 1-1 is calculated from the current count value of the quadruple multiplication counter 1-13.
The corrected lens speed VR is calculated by subtracting the previous count value of 3, and the process proceeds to S103. Since the interval interrupt processing is performed at a predetermined time interval, the correction lens 8 is obtained by taking the difference between the counter value of the quadruple counter 1-13 at the time of the previous interval timer interrupt processing and the current counter value. It is possible to calculate the amount of change during a predetermined time (here, 1 ms), that is, the speed VR of the correction lens 8. It should be noted that the count value of the quadruple counter 1-13 is held during the interval timer interrupt process until S102 of the next interval timer interrupt process.

Next, in S103, S101 and S
Drive du of the motor 4 from VC and VR calculated in 102
Calculate ty. The calculation formula is calculated by, for example, formula (4). However, the upper limit of drive duty is +10
0% and the lower limit is -100%. Drive duty = K1 × VC + K2 × (VC-VR) (4)

Next, the drive dut calculated in S104
y is set to the PWM timer 1-15, and the motor drive circuit 2
Through, the motor 4 is driven with the set drive duty. Next, in step S105, the interval timer interrupt process ends.

The equation (4) will be described. First
The term K1 × VC is a duty that is proportional to the correction lens target speed VC, and thus the correction lens 8 is controlled to be a speed close to the approximate target speed VC. The second term K2 × (VC-VR) is the difference between the actual speed VR of the correction lens 8 and the target speed VC, that is, the duty that is proportional to the speed error. The correction lens 8 is controlled. Note that K1 and K2 are set to the best values by experiments so that the actual speed VR of the correction lens 8 can be accurately controlled with respect to the target speed VC. Expression (4) is an example of the control expression, and the control may be performed using a control expression other than this.

Next, the controlled state of the correction lens 8 will be described with reference to FIG. FIG. 5 is a diagram showing a method of controlling the motor in this embodiment. Timing ta-tb
In equation (4), since the difference between VC and VR is large,
The driving duty calculated by the upper limit value + 100%
It has become. After timing tb, VC and VR are small, and the drive duty determined by equation (4) is 100%.
The following is a detailed drive dut by VC and VR.
The motor 4 is controlled by y. As a result, the control of the correction lens 8 is smoother and the control error (corresponding to the difference between VC and VR) is reduced as compared with the conventional control method shown in FIG.

As described above, according to this embodiment, by incorporating the quadruple counter 1-13, the PWM timer 1-15, the interval timer 1-12, etc. in the CPU 1,
The processing load of the PU 1 can be reduced, and the correction lens can be smoothly controlled.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible, which are also included in the present invention. For example, in the present embodiment, the correction lens 8 is controlled by changing the duty for energizing the motor 4 P
Although the WM control has been described, the present invention can be replaced by voltage control that controls this by changing the drive voltage of the motor 4. In this case, drive d
corresponding to the control in which the duty is replaced with the drive voltage, and is driven by a microcomputer having a D / A conversion function.
The motor drive circuit 2 is generated by generating a voltage corresponding to the ty value.
May be configured to drive the motor 4 with a voltage proportional to the voltage.

In this embodiment, the method of changing the optical axis of the photographing optical system is explained by shifting a part of the photographing optical system, but other than this, a vari-angle prism or the like may be used. Alternatively, it is also possible to use other actuators such as a voice coil instead of the motor 4.

Further, although the example of the quadruple multiplication counter has been described, a doubling multiplication counter may be used. In this case,
The count value may be increased or decreased based on the phase difference at the rising and falling edges of the A phase or B phase,
This is the same as counting every other count value in FIG. In addition, the predetermined time for obtaining the change amount of the count value is set to 1
Although an example of ms has been described, it is not particularly limited, and may be 2 ms or the like depending on the design specifications. The other numerical examples described above are also the same.

[0052]

According to the present invention, the position of the optical axis changing portion such as the correction lens can be detected by referring to the counter value of the multiplication counter, and the load of processing such as displacement calculation can be reduced. It was

Further, by setting a desired value in the PWM timer, it becomes possible to drive an optical axis changing drive unit such as a motor, and finer control than before is possible.

Further, based on the interrupt processing activated by the interval timer, the difference between the count value of the previous multiplication counter and the current count value of the multiplication counter is calculated, whereby the light of the correction lens or the like is detected. It is possible to calculate the speed of the axis changing portion, and it is no longer necessary to perform complicated calculation as in the past.

[Brief description of drawings]

FIG. 1 is a circuit diagram schematically showing an embodiment of an image stabilization camera according to the present invention.

FIG. 2 is a circuit diagram schematically showing an example of a conventional camera shake correction camera.

FIG. 3 is a diagram showing an operation of a quadruple counter and a method of calculating the position and speed of a correction lens in the present invention.

FIG. 4 is a diagram showing a method of calculating the position and speed of a correction lens in a conventional example.

FIG. 5 is a diagram showing a motor control method according to the present invention.

FIG. 6 is a diagram showing a motor control method in a conventional example.

FIG. 7 is a flowchart showing a flow of interval timer interrupt processing in the present invention.

[Explanation of symbols]

 1 CPU 1-11 A / D converter 1-12 Interval timer 1-13 4 multiplication counter 1-14 Interval timer interrupt processing unit 1-15 PWM timer 2 Motor drive circuit 3 Position detection interrupter 4 Motor 5 Angular velocity detection circuit 6 Shooting lens 7 Shooting lens 8 Shooting lens (image stabilization lens) 9 Shooting lens

Claims (3)

[Claims] 1. A two-phase interrupter for detecting a displacement of the optical axis changing unit, an optical axis changing unit for changing the photographing optical axis, an optical axis changing drive unit for driving the optical axis changing unit, and a two-phase interrupter. In a camera shake correction camera including a displacement signal detection unit that outputs as a signal, at least one of the two-phase interrupter signals of the displacement signal detection unit rises and falls, and the two-phase interrupter signal Based on the phase difference,
It is characterized by further comprising: a multiplication counter for multiplying by 2 or 4 for increasing or decreasing the count value; and a displacement calculating unit for directly calculating the displacement of the optical axis changing unit based on the count value of the multiplying counter. An image stabilizer camera. 2. The image stabilization camera according to claim 1, wherein a PW that outputs a signal that changes a ratio of a high-level signal width during a predetermined time based on the output of the multiplication counter.
An image stabilization camera, comprising an M timer, wherein the optical axis change drive unit is controlled by the output of the PWM timer. 3. The image stabilization camera according to claim 2, further comprising an interval timer for activating interrupt processing at a predetermined time interval, wherein the displacement of the optical axis changing portion is detected by the count value of the multiplication counter, Based on the interrupt process activated by the interval timer, the displacement speed of the optical axis changing unit is calculated from the count value of the previous multiplication counter and the current count value of the multiplication counter, An image stabilization camera, characterized in that the optical axis change drive unit is controlled by the output of a PWM timer.